Provided by: devscripts_2.20.2ubuntu2_amd64 
NAME
uscan - scan/watch upstream sources for new releases of software
SYNOPSIS
uscan [options] [path]
DESCRIPTION
For basic usage, uscan is executed without any arguments from the root of the Debianized
source tree where you see the debian/ directory. Then typically the following happens:
· uscan reads the first entry in debian/changelog to determine the source package name
<spkg> and the last upstream version.
· uscan process the watch lines debian/watch from the top to the bottom in a single
pass.
· uscan downloads a web page from the specified URL in debian/watch.
· uscan extracts hrefs pointing to the upstream tarball(s) from the web page using
the specified matching-pattern in debian/watch.
· uscan downloads the upstream tarball with the highest version newer than the last
upstream version.
· uscan saves the downloaded tarball to the parent ../ directory:
../<upkg>-<uversion>.tar.gz
· uscan invokes mk-origtargz to create the source tarball:
../<spkg>_<oversion>.orig.tar.gz
· For a multiple upstream tarball (MUT) package, the secondary upstream tarball
will instead be named ../<spkg>_<oversion>.orig-<component>.tar.gz.
· Repeat until all lines in debian/watch are processed.
· uscan invokes uupdate to create the Debianized source tree: ../<spkg>-<oversion>/*
Please note the following.
· For simplicity, the compression method used in examples is gzip with .gz suffix.
Other methods such as xz, bzip2, and lzma with corresponding xz, bz2, and lzma
suffixes may also be used.
· The new version=4 enables handling of multiple upstream tarball (MUT) packages but
this is a rare case for Debian packaging. For a single upstream tarball package,
there is only one watch line and no ../<spkg>_<oversion>.orig-<component>.tar.gz .
· uscan with the --verbose option produces a human readable report of uscan's execution.
· uscan with the --debug option produces a human readable report of uscan's execution
including internal variable states.
· uscan with the --dehs option produces an upstream package status report in XML format
for other programs such as the Debian External Health System.
· The primary objective of uscan is to help identify if the latest version upstream
tarball is used or not; and to download the latest upstream tarball. The ordering of
versions is decided by dpkg --compare-versions.
· uscan with the --safe option limits the functionality of uscan to its primary
objective. Both the repacking of downloaded files and updating of the source tree are
skipped to avoid running unsafe scripts. This also changes the default to
--no-download and --skip-signature.
FORMAT OF THE WATCH FILE
The current version 4 format of debian/watch can be summarized as follows:
· Leading spaces and tabs are dropped.
· Empty lines are dropped.
· A line started by # (hash) is a comment line and dropped.
· A single \ (back slash) at the end of a line is dropped and the next line is
concatenated after removing leading spaces and tabs. The concatenated line is parsed
as a single line. (The existence or non-existence of the space before the tailing
single \ is significant.)
· The first non-comment line is:
version=4
This is a required line and the recommended version number.
If you use "version=3" instead here, some features may not work as documented here.
See "HISTORY AND UPGRADING".
· The following non-comment lines (watch lines) specify the rules for the selection of
the candidate upstream tarball URLs and are in one of the following three formats:
· opts=" ... " http://URL matching-pattern [version [script]]
· http://URL matching-pattern [version [script]]
· opts=" ... "
Here,
· opts=" ... " specifies the behavior of uscan. See "WATCH FILE OPTIONS".
· http://URL specifies the web page where upstream publishes the link to the latest
source archive.
· https://URL may also be used, as may
· ftp://URL
· Some parts of URL may be in the regex match pattern surrounded between ( and )
such as /foo/bar-([\.\d]+)/. (If multiple directories match, the highest
version is picked.) Otherwise, the URL is taken as verbatim.
· matching-pattern specifies the full string matching pattern for hrefs in the web
page. See "WATCH FILE EXAMPLES".
· All matching parts in ( and ) are concatenated with . (period) to form the
upstream version.
· If the hrefs do not contain directories, you can combine this with the
previous entry. I.e., http://URL/matching-pattern .
· version restricts the upstream tarball which may be downloaded. The newest
available version is chosen in each case.
· debian (default) requires the downloading upstream tarball to be newer than
the version obtained from debian/changelog.
· version-number such as 12.5 requires the upstream tarball to be newer than the
version-number.
· same requires the downloaded version of the secondary tarballs to be exactly
the same as the one for the first upstream tarball downloaded. (Useful only
for MUT)
· previous restricts the version of the signature file. (Used with
pgpmode=previous)
· ignore does not restrict the version of the secondary tarballs. (Maybe useful
for MUT)
· group requires the downloading upstream tarball to be newer than the version
obtained from debian/changelog. Package version is the concatenation of all
"group" upstream version.
· script is executed at the end of uscan execution with appropriate arguments
provided by uscan (default: no action).
· The typical Debian package is a non-native package made from one upstream
tarball. Only a single line of the watch line in one of the first two formats
is usually used with its version set to debian and script set to uupdate.
· A native package should not specify script.
· A multiple upstream tarball (MUT) package should specify uupdate as script in
the last watch line and should skip specifying script in the rest of the watch
lines.
· The last format of the watch line is useful to set the persistent parameters:
user-agent, compression. If this format is used, this must be followed by the URL
defining watch line(s).
· [ and ] in the above format are there to mark the optional parts and should not be
typed.
There are a few special strings which are substituted by uscan to make it easy to write
the watch file.
@PACKAGE@
This is substituted with the source package name found in the first line of the
debian/changelog file.
@ANY_VERSION@
This is substituted by the legal upstream version regex (capturing).
[-_]?(\d[\-+\.:\~\da-zA-Z]*)
@ARCHIVE_EXT@
This is substituted by the typical archive file extension regex (non-capturing).
(?i)\.(?:tar\.xz|tar\.bz2|tar\.gz|zip|tgz|tbz|txz)
@SIGNATURE_EXT@
This is substituted by the typical signature file extension regex (non-capturing).
(?i)\.(?:tar\.xz|tar\.bz2|tar\.gz|zip|tgz|tbz|txz)\.(?:asc|pgp|gpg|sig|sign)
@DEB_EXT@
This is substituted by the typical Debian extension regexp (capturing).
[\+~](debian|dfsg|ds|deb)(\.)?(\d+)?$
Some file extensions are not included in the above intentionally to avoid false positives.
You can still set such file extension patterns manually.
WATCH FILE OPTIONS
uscan reads the watch options specified in opts=" ... " to customize its behavior.
Multiple options option1, option2, option3, ... can be set as opts="option1, option2,
option3, ... " . The double quotes are necessary if options contain any spaces.
Unless otherwise noted as persistent, most options are valid only within their containing
watch line.
The available watch options are:
component=component
Set the name of the secondary source tarball as
<spkg>_<oversion>.orig-<component>.tar.gz for a MUT package.
compression=method
Set the compression method when the tarball is repacked (persistent).
Available method values are what mk-origtargz supports, so xz, gzip (alias gz), bzip2
(alias bz2), lzma, default. The default method is currently xz. When uscan is
launched in a debian source repository which format is "1.0" or undefined, the method
switches to gzip.
Please note the repacking of the upstream tarballs by mk-origtargz happens only if one
of the following conditions is satisfied:
· USCAN_REPACK is set in the devscript configuration. See "DEVSCRIPT CONFIGURATION
VARIABLES".
· --repack is set on the commandline. See <COMMANDLINE OPTIONS>.
· repack is set in the watch line as opts="repack,...".
· The upstream archive is of zip type including jar, xpi, ...
· Files-Excluded or Files-Excluded-component stanzas are set in debian/copyright to
make mk-origtargz invoked from uscan remove files from the upstream tarball and
repack it. See "COPYRIGHT FILE EXAMPLES" and mk-origtargz(1).
repack
Force repacking of the upstream tarball using the compression method.
repacksuffix=suffix
Add suffix to the Debian package upstream version only when the source tarball is
repackaged. This rule should be used only for a single upstream tarball package.
mode=mode
Set the archive download mode.
LWP This mode is the default one which downloads the specified tarball from the
archive URL on the web. Automatically internal mode value is updated to either
http or ftp by URL.
git This mode accesses the upstream git archive directly with the git command and
packs the source tree with the specified tag via matching-pattern into spkg-
version.tar.xz.
If the upstream publishes the released tarball via its web interface, please use
it instead of using this mode. This mode is the last resort method.
For git mode, matching-pattern specifies the full string matching pattern for tags
instead of hrefs. If matching-pattern is set to refs/tags/tag-matching-pattern,
uscan downloads source from the refs/tags/matched-tag of the git repository. The
upstream version is extracted from concatenating the matched parts in ( ... ) with
. . See "WATCH FILE EXAMPLES".
If matching-pattern is set to HEAD, uscan downloads source from the HEAD of the
git repository and the pertinent version is automatically generated with the date
and hash of the HEAD of the git repository.
If matching-pattern is set to heads/branch, uscan downloads source from the named
branch of the git repository.
The local repository is temporarily created as a bare git repository directory
under the destination directory where the downloaded archive is generated. This
is normally erased after the uscan execution. This local repository is kept if
--debug option is used.
If the current directory is a git repository and the searched repository is listed
among the registered "remotes", then uscan will use it instead of cloning
separately. The only local change is that uscan will run a "fetch" command to
refresh the repository.
svn This mode accesses the upstream Subversion archive directly with the svn command
and packs the source tree.
For svn mode, matching-pattern specifies the full string matching pattern for
directories under Subversion repository directory, specified via URL. The
upstream version is extracted from concatenating the matched parts in ( ... )
with . .
If matching-pattern is set to HEAD, uscan downloads the latest source tree of the
URL. The upstream version is then constructed by appending the last revision of
the URL to 0.0~svn.
As commit signing is not possible with Subversion, the default pgpmode is set to
none when mode=svn. Settings of pgpmode other than default and none are reported
as errors.
pretty=rule
Set the upstream version string to an arbitrary format as an optional opts argument
when the matching-pattern is HEAD or heads/branch for git mode. For the exact syntax,
see the git-log manpage under tformat. The default is pretty=0.0~git%cd.%h. No
uversionmangle rules is applicable for this case.
When pretty=describe is used, the upstream version string is the output of the "git
describe --tags | sed s/-/./g" command instead. For example, if the commit is the 5-th
after the last tag v2.17.12 and its short hash is ged992511, then the string is
v2.17.12.5.ged992511 . For this case, it is good idea to add uversionmangle=s/^/0.0~/
or uversionmangle=s/^v// to make the upstream version string compatible with Debian.
uversionmangle=s/^v// may work as well. Please note that in order for pretty=describe
to function well, upstream need to avoid tagging with random alphabetic tags.
The pretty=describe forces to set gitmode=full to make a full local clone of the
repository automatically.
date=rule
Set the date string used by the pretty option to an arbitrary format as an optional
opts argument when the matching-pattern is HEAD or heads/branch for git mode. For the
exact syntax, see the strftime manpage. The default is date=%Y%m%d.
gitmode=mode
Set the git clone operation mode. The default is gitmode=shallow. For some dumb git
server, you may need to manually set gitmode=full to force full clone operation.
If the current directory is a git repository and the searched repository is listed
among the registered "remotes", then uscan will use it instead of cloning separately.
pgpmode=mode
Set the PGP/GPG signature verification mode.
auto
uscan checks possible URLs for the signature file and autogenerates a
pgpsigurlmangle rule to use it.
default
Use pgpsigurlmangle=rules to generate the candidate upstream signature file URL
string from the upstream tarball URL. (default)
If the specified pgpsigurlmangle is missing, uscan checks possible URLs for the
signature file and suggests adding a pgpsigurlmangle rule.
mangle
Use pgpsigurlmangle=rules to generate the candidate upstream signature file URL
string from the upstream tarball URL.
next
Verify this downloaded tarball file with the signature file specified in the next
watch line. The next watch line must be pgpmode=previous. Otherwise, no
verification occurs.
previous
Verify the downloaded tarball file specified in the previous watch line with this
signature file. The previous watch line must be pgpmode=next.
self
Verify the downloaded file foo.ext with its self signature and extract its content
tarball file as foo.
gittag
Verify tag signature if mode=git.
none
No signature available. (No warning.)
searchmode=mode
Set the parsing search mode.
html (default): search pattern in "href" parameter of <a> HTML tags
plain: search pattern in the full page
This is useful is page content is not HTML but in JSON. Example with npmjs.com:
version=4
opts="searchmode=plain" \
https://registry.npmjs.org/aes-js \
https://registry.npmjs.org/aes-js/-/aes-js-(\d[\d\.]*)@ARCHIVE_EXT@
decompress
Decompress compressed archive before the pgp/gpg signature verification.
bare
Disable all site specific special case code such as URL redirector uses and page
content alterations. (persistent)
user-agent=user-agent-string
Set the user-agent string used to contact the HTTP(S) server as user-agent-string.
(persistent)
user-agent option should be specified by itself in the watch line without URL, to
allow using semicolons and commas in it.
pasv, passive
Use PASV mode for the FTP connection.
If PASV mode is required due to the client side network environment, set uscan to use
PASV mode via "COMMANDLINE OPTIONS" or "DEVSCRIPT CONFIGURATION VARIABLES" instead.
active, nopasv
Don't use PASV mode for the FTP connection.
unzipopt=options
Add the extra options to use with the unzip command, such as -a, -aa, and -b, when
executed by mk-origtargz.
dversionmangle=rules
Normalize the last upstream version string found in debian/changelog to compare it to
the available upstream tarball version. Removal of the Debian specific suffix such as
s/@DEB_EXT@// is usually done here.
You can also use dversionmangle=auto, this is exactly the same than
dversionmangle=s/@DEB_EXT@//
dirversionmangle=rules
Normalize the directory path string matching the regex in a set of parentheses of
http://URL as the sortable version index string. This is used as the directory path
sorting index only.
Substitution such as s/PRE/~pre/; s/RC/~rc/ may help.
pagemangle=rules
Normalize the downloaded web page string. (Don't use this unless this is absolutely
needed. Generally, g flag is required for these rules.)
This is handy if you wish to access Amazon AWS or Subversion repositories in which <a
href="..."> is not used.
uversionmangle=rules
Normalize the candidate upstream version strings extracted from hrefs in the source of
the web page. This is used as the version sorting index when selecting the latest
upstream version.
Substitution such as s/PRE/~pre/; s/RC/~rc/ may help.
versionmangle=rules
Syntactic shorthand for uversionmangle=rules, dversionmangle=rules
hrefdecode=percent-encoding
Convert the selected upstream tarball href string from the percent-encoded hexadecimal
string to the decoded normal URL string for obfuscated web sites. Only percent-
encoding is available and it is decoded with s/%([A-Fa-f\d]{2})/chr hex $1/eg.
downloadurlmangle=rules
Convert the selected upstream tarball href string into the accessible URL for
obfuscated web sites. This is run after hrefdecode.
filenamemangle=rules
Generate the upstream tarball filename from the selected href string if matching-
pattern can extract the latest upstream version <uversion> from the selected href
string. Otherwise, generate the upstream tarball filename from its full URL string
and set the missing <uversion> from the generated upstream tarball filename.
Without this option, the default upstream tarball filename is generated by taking the
last component of the URL and removing everything after any '?' or '#'.
pgpsigurlmangle=rules
Generate the candidate upstream signature file URL string from the upstream tarball
URL.
oversionmangle=rules
Generate the version string <oversion> of the source tarball
<spkg>_<oversion>.orig.tar.gz from <uversion>. This should be used to add a suffix
such as +dfsg1 to a MUT package.
Here, the mangling rules apply the rules to the pertinent string. Multiple rules can be
specified in a mangling rule string by making a concatenated string of each mangling rule
separated by ; (semicolon).
Each mangling rule cannot contain ; (semicolon), , (comma), or " (double quote).
Each mangling rule behaves as if a Perl command "$string =~ rule" is executed. There are
some notable details.
· rule may only use the s, tr, and y operations.
s/regex/replacement/options
Regex pattern match and replace the target string. Only the g, i and x flags are
available. Use the $1 syntax for back references (No \1 syntax). Code execution
is not allowed (i.e. no (?{}) or (??{}) constructs).
y/source/dest/ or tr/source/dest/
Transliterate the characters in the target string.
EXAMPLE OF EXECUTION
uscan reads the first entry in debian/changelog to determine the source package name and
the last upstream version.
For example, if the first entry of debian/changelog is:
· bar (3:2.03+dfsg1-4) unstable; urgency=low
then, the source package name is bar and the last Debian package version is
3:2.03+dfsg1-4.
The last upstream version is normalized to 2.03+dfsg1 by removing the epoch and the Debian
revision.
If the dversionmangle rule exists, the last upstream version is further normalized by
applying this rule to it. For example, if the last upstream version is 2.03+dfsg1
indicating the source tarball is repackaged, the suffix +dfsg1 is removed by the string
substitution s/\+dfsg\d*$// to make the (dversionmangled) last upstream version 2.03 and
it is compared to the candidate upstream tarball versions such as 2.03, 2.04, ... found in
the remote site. Thus, set this rule as:
· opts="dversionmangle=s/\+dfsg\d*$//"
uscan downloads a web page from http://URL specified in debian/watch.
· If the directory name part of URL has no parentheses, ( and ), it is taken as
verbatim.
· If the directory name part of URL has parentheses, ( and ), then uscan recursively
searches all possible directories to find a page for the newest version. If the
dirversionmangle rule exists, the generated sorting index is used to find the newest
version. If a specific version is specified for the download, the matching version
string has priority over the newest version.
For example, this http://URL may be specified as:
· http://www.example.org/([\d\.]+)/
Please note the trailing / in the above to make ([\d\.]+) as the directory.
If the pagemangle rule exists, the whole downloaded web page as a string is normalized by
applying this rule to it. This is very powerful tool and needs to be used with caution.
If other mangling rules can be used to address your objective, do not use this rule.
The downloaded web page is scanned for hrefs defined in the <a href=" ... "> tag to locate
the candidate upstream tarball hrefs. These candidate upstream tarball hrefs are matched
by the Perl regex pattern matching-pattern such as DL-(?:[\d\.]+?)/foo-(.+)\.tar\.gz to
narrow down the candidates. This pattern match needs to be anchored at the beginning and
the end. For example, candidate hrefs may be:
· DL-2.02/foo-2.02.tar.gz
· DL-2.03/foo-2.03.tar.gz
· DL-2.04/foo-2.04.tar.gz
Here the matching string of (.+) in matching-pattern is considered as the candidate
upstream version. If there are multiple matching strings of capturing patterns in
matching-pattern, they are all concatenated with . (period) to form the candidate
upstream version. Make sure to use the non-capturing regex such as (?:[\d\.]+?) instead
for the variable text matching part unrelated to the version.
Then, the candidate upstream versions are:
· 2.02
· 2.03
· 2.04
The downloaded tarball filename is basically set to the same as the filename in the remote
URL of the selected href.
If the uversionmangle rule exists, the candidate upstream versions are normalized by
applying this rule to them. (This rule may be useful if the upstream version scheme
doesn't sort correctly to identify the newest version.)
The upstream tarball href corresponding to the newest (uversionmangled) candidate upstream
version newer than the (dversionmangled) last upstream version is selected.
If multiple upstream tarball hrefs corresponding to a single version with different
extensions exist, the highest compression one is chosen. (Priority: tar.xz > tar.lzma >
tar.bz2 > tar.gz.)
If the selected upstream tarball href is the relative URL, it is converted to the absolute
URL using the base URL of the web page. If the <base href=" ... "> tag exists in the
web page, the selected upstream tarball href is converted to the absolute URL using the
specified base URL in the base tag, instead.
If the downloadurlmangle rule exists, the selected upstream tarball href is normalized by
applying this rule to it. (This is useful for some sites with the obfuscated download
URL.)
If the filenamemangle rule exists, the downloaded tarball filename is generated by
applying this rule to the selected href if matching-pattern can extract the latest
upstream version <uversion> from the selected href string. Otherwise, generate the
upstream tarball filename from its full URL string and set the missing <uversion> from the
generated upstream tarball filename.
Without the filenamemangle rule, the default upstream tarball filename is generated by
taking the last component of the URL and removing everything after any '?' or '#'.
uscan downloads the selected upstream tarball to the parent ../ directory. For example,
the downloaded file may be:
· ../foo-2.04.tar.gz
Let's call this downloaded version 2.04 in the above example generically as <uversion> in
the following.
If the pgpsigurlmangle rule exists, the upstream signature file URL is generated by
applying this rule to the (downloadurlmangled) selected upstream tarball href and the
signature file is tried to be downloaded from it.
If the pgpsigurlmangle rule doesn't exist, uscan warns user if the matching upstream
signature file is available from the same URL with their filename being suffixed by the 5
common suffix asc, gpg, pgp, sig and sign. (You can avoid this warning by setting
pgpmode=none.)
If the signature file is downloaded, the downloaded upstream tarball is checked for its
authenticity against the downloaded signature file using the armored keyring
debian/upstream/signing-key.asc (see "KEYRING FILE EXAMPLES"). If its signature is not
valid, or not made by one of the listed keys, uscan will report an error.
If the oversionmangle rule exists, the source tarball version oversion is generated from
the downloaded upstream version uversion by applying this rule. This rule is useful to add
suffix such as +dfsg1 to the version of all the source packages of the MUT package for
which the repacksuffix mechanism doesn't work.
uscan invokes mk-origtargz to create the source tarball properly named for the source
package with .orig. (or .orig-<component>. for the secondary tarballs) in its filename.
case A: packaging of the upstream tarball as is
mk-origtargz creates a symlink ../bar_<oversion>.orig.tar.gz linked to the downloaded
local upstream tarball. Here, bar is the source package name found in
debian/changelog. The generated symlink may be:
· ../bar_2.04.orig.tar.gz -> foo-2.04.tar.gz (as is)
Usually, there is no need to set up opts="dversionmangle= ... " for this case.
case B: packaging of the upstream tarball after removing non-DFSG files
mk-origtargz checks the filename glob of the Files-Excluded stanza in the first
section of debian/copyright, removes matching files to create a repacked upstream
tarball. Normally, the repacked upstream tarball is renamed with suffix to
../bar_<oversion><suffix>.orig.tar.gz using the repacksuffix option for the single
upstream package. Here <oversion> is updated to be <oversion><suffix>.
The removal of files is required if files are not DFSG-compliant. For such case,
+dfsg1 is used as suffix.
So the combined options are set as opts="dversionmangle=s/\+dfsg\d*$//
,repacksuffix=+dfsg1", instead.
For example, the repacked upstream tarball may be:
· ../bar_2.04+dfsg1.orig.tar.gz (repackaged)
uscan normally invokes "uupdate --find --upstream-version oversion " for the version=4
watch file.
Please note that --find option is used here since mk-origtargz has been invoked to make
*.orig.tar.gz file already. uscan picks bar from debian/changelog.
It creates the new upstream source tree under the ../bar-<oversion> directory and
Debianize it leveraging the last package contents.
WATCH FILE EXAMPLES
When writing the watch file, you should rely on the latest upstream source announcement
web page. You should not try to second guess the upstream archive structure if possible.
Here are the typical debian/watch files.
Please note that executing uscan with -v or -vv reveals what exactly happens internally.
The existence and non-existence of a space the before tailing \ (back slash) are
significant.
Some undocumented shorter configuration strings are used in the below EXAMPLES to help you
with typing. These are intentional ones. uscan is written to accept such common sense
abbreviations but don't push the limit.
HTTP site (basic)
Here is an example for the basic single upstream tarball.
version=4
http://example.com/~user/release/foo.html \
files/foo-([\d\.]+)\.tar\.gz debian uupdate
Or using the special strings:
version=4
http://example.com/~user/release/@PACKAGE@.html \
files/@PACKAGE@@ANY_VERSION@@ARCHIVE_EXT@ debian uupdate
For the upstream source package foo-2.0.tar.gz, this watch file downloads and creates the
Debian orig.tar file foo_2.0.orig.tar.gz.
HTTP site (pgpsigurlmangle)
Here is an example for the basic single upstream tarball with the matching signature file
in the same file path.
version=4
opts="pgpsigurlmangle=s%$%.asc%" http://example.com/release/@PACKAGE@.html \
files/@PACKAGE@@ANY_VERSION@@ARCHIVE_EXT@ debian uupdate
For the upstream source package foo-2.0.tar.gz and the upstream signature file
foo-2.0.tar.gz.asc, this watch file downloads these files, verifies the authenticity using
the keyring debian/upstream/signing-key.asc and creates the Debian orig.tar file
foo_2.0.orig.tar.gz.
Here is another example for the basic single upstream tarball with the matching signature
file on decompressed tarball in the same file path.
version=4
opts="pgpsigurlmangle=s%@ARCHIVE_EXT@$%.asc%,decompress" \
http://example.com/release/@PACKAGE@.html \
files/@PACKAGE@@ANY_VERSION@@ARCHIVE_EXT@ debian uupdate
For the upstream source package foo-2.0.tar.gz and the upstream signature file
foo-2.0.tar.asc, this watch file downloads these files, verifies the authenticity using
the keyring debian/upstream/signing-key.asc and creates the Debian orig.tar file
foo_2.0.orig.tar.gz.
HTTP site (pgpmode=next/previous)
Here is an example for the basic single upstream tarball with the matching signature file
in the unrelated file path.
version=4
opts="pgpmode=next" http://example.com/release/@PACKAGE@.html \
files/(?:\d+)/@PACKAGE@@ANY_VERSION@@ARCHIVE_EXT@ debian
opts="pgpmode=previous" http://example.com/release/@PACKAGE@.html \
files/(?:\d+)/@PACKAGE@@ANY_VERSION@@SIGNATURE_EXT@ previous uupdate
(?:\d+) part can be any random value. The tarball file can have 53, while the signature
file can have 33.
([\d\.]+) part for the signature file has a strict requirement to match that for the
upstream tarball specified in the previous line by having previous as version in the watch
line.
HTTP site (flexible)
Here is an example for the maximum flexibility of upstream tarball and signature file
extensions.
version=4
opts="pgpmode=next" http://example.com/DL/ \
files/(?:\d+)/@PACKAGE@@ANY_VERSION@@ARCHIVE_EXT@ debian
opts="pgpmode=previous" http://example.com/DL/ \
files/(?:\d+)/@PACKAGE@@ANY_VERSION@@SIGNATURE_EXT@ \
previous uupdate
HTTP site (basic MUT)
Here is an example for the basic multiple upstream tarballs.
version=4
opts="pgpsigurlmangle=s%$%.sig%" \
http://example.com/release/foo.html \
files/foo-([\d\.]+)\.tar\.gz debian
opts="pgpsigurlmangle=s%$%.sig%, component=bar" \
http://example.com/release/foo.html \
files/foobar-([\d\.]+)\.tar\.gz same
opts="pgpsigurlmangle=s%$%.sig%, component=baz" \
http://example.com/release/foo.html \
files/foobaz-([\d\.]+)\.tar\.gz same uupdate
For the main upstream source package foo-2.0.tar.gz and the secondary upstream source
packages foobar-2.0.tar.gz and foobaz-2.0.tar.gz which install under bar/ and baz/, this
watch file downloads and creates the Debian orig.tar file foo_2.0.orig.tar.gz,
foo_2.0.orig-bar.tar.gz and foo_2.0.orig-baz.tar.gz. Also, these upstream tarballs are
verified by their signature files.
HTTP site (recursive directory scanning)
Here is an example with the recursive directory scanning for the upstream tarball and its
signature files released in a directory named after their version.
version=4
opts="pgpsigurlmangle=s%$%.sig%, dirversionmangle=s/-PRE/~pre/;s/-RC/~rc/" \
http://tmrc.mit.edu/mirror/twisted/Twisted/([\d+\.]+)/ \
Twisted-([\d\.]+)\.tar\.xz debian uupdate
Here, the web site should be accessible at the following URL:
http://tmrc.mit.edu/mirror/twisted/Twisted/
Here, dirversionmangle option is used to normalize the sorting order of the directory
names.
HTTP site (alternative shorthand)
For the bare HTTP site where you can directly see archive filenames, the normal watch
file:
version=4
opts="pgpsigurlmangle=s%$%.sig%" \
http://www.cpan.org/modules/by-module/Text/ \
Text-CSV_XS-(.+)\.tar\.gz \
debian uupdate
can be rewritten in an alternative shorthand form only with a single string covering URL
and filename:
version=4
opts="pgpsigurlmangle=s%$%.sig%" \
http://www.cpan.org/modules/by-module/Text/Text-CSV_XS-(.+)\.tar\.gz \
debian uupdate
In version=4, initial white spaces are dropped. Thus, this alternative shorthand form can
also be written as:
version=4
opts="pgpsigurlmangle=s%$%.sig%" \
http://www.cpan.org/modules/by-module/Text/\
Text-CSV_XS-(.+)\.tar\.gz \
debian uupdate
Please note the subtle difference of a space before the tailing \ between the first and
the last examples.
HTTP site (funny version)
For a site which has funny version numbers, the parenthesized groups will be joined with .
(period) to make a sanitized version number.
version=4
http://www.site.com/pub/foobar/foobar_v(\d+)_(\d+)\.tar\.gz \
debian uupdate
HTTP site (DFSG)
The upstream part of the Debian version number can be mangled to indicate the source
package was repackaged to clean up non-DFSG files:
version=4
opts="dversionmangle=s/\+dfsg\d*$//,repacksuffix=+dfsg1" \
http://some.site.org/some/path/foobar-(.+)\.tar\.gz debian uupdate
See "COPYRIGHT FILE EXAMPLES".
HTTP site (filenamemangle)
The upstream tarball filename is found by taking the last component of the URL and
removing everything after any '?' or '#'.
If this does not fit to you, use filenamemangle. For example, <A
href="http://foo.bar.org/dl/?path=&dl=foo-0.1.1.tar.gz"> could be handled as:
version=4
opts=filenamemangle=s/.*=(.*)/$1/ \
http://foo.bar.org/dl/\?path=&dl=foo-(.+)\.tar\.gz \
debian uupdate
<A href="http://foo.bar.org/dl/?path=&dl_version=0.1.1"> could be handled as:
version=4
opts=filenamemangle=s/.*=(.*)/foo-$1\.tar\.gz/ \
http://foo.bar.org/dl/\?path=&dl_version=(.+) \
debian uupdate
If the href string has no version using <I>matching-pattern>, the version can be obtained
from the full URL using filenamemangle.
version=4
opts=filenamemangle=s&.*/dl/(.*)/foo\.tar\.gz&foo-$1\.tar\.gz& \
http://foo.bar.org/dl/([\.\d]+)/ foo.tar.gz \
debian uupdate
HTTP site (downloadurlmangle)
The option downloadurlmangle can be used to mangle the URL of the file to download. This
can only be used with http:// URLs. This may be necessary if the link given on the web
page needs to be transformed in some way into one which will work automatically, for
example:
version=4
opts=downloadurlmangle=s/prdownload/download/ \
http://developer.berlios.de/project/showfiles.php?group_id=2051 \
http://prdownload.berlios.de/softdevice/vdr-softdevice-(.+).tgz \
debian uupdate
HTTP site (oversionmangle, MUT)
The option oversionmangle can be used to mangle the version of the source tarball
(.orig.tar.gz and .orig-bar.tar.gz). For example, +dfsg1 can be added to the upstream
version as:
version=4
opts=oversionmangle=s/(.*)/$1+dfsg1/ \
http://example.com/~user/release/foo.html \
files/foo-([\d\.]*).tar.gz debian
opts="component=bar" \
http://example.com/~user/release/foo.html \
files/bar-([\d\.]*).tar.gz same uupdate
See "COPYRIGHT FILE EXAMPLES".
HTTP site (pagemangle)
The option pagemangle can be used to mangle the downloaded web page before applying other
rules. The non-standard web page without proper <a href=" << ... >> "> entries can be
converted. For example, if foo.html uses <a bogus=" ... ">, this can be converted to the
standard page format with:
version=4
opts=pagemangle="s/<a\s+bogus=/<a href=/g" \
http://example.com/release/foo.html \
files/@PACKAGE@@ANY_VERSION@@ARCHIVE_EXT@ debian uupdate
Please note the use of g here to replace all occurrences.
If foo.html uses <Key> ... </Key>, this can be converted to the standard page format with:
version=4
opts="pagemangle=s%<Key>([^<]*)</Key>%<Key><a href="$1">$1</a></Key>%g" \
http://example.com/release/foo.html \
(?:.*)/@PACKAGE@@ANY_VERSION@@ARCHIVE_EXT@ debian uupdate
FTP site (basic):
version=4
ftp://ftp.tex.ac.uk/tex-archive/web/c_cpp/cweb/cweb-(.+)\.tar\.gz \
debian uupdate
FTP site (regex special characters):
version=4
ftp://ftp.worldforge.org/pub/worldforge/libs/\
Atlas-C++/transitional/Atlas-C\+\+-(.+)\.tar\.gz debian uupdate
Please note that this URL is connected to be ... libs/Atlas-C++/ ... . For ++, the first
one in the directory path is verbatim while the one in the filename is escaped by \.
FTP site (funny version)
This is another way of handling site with funny version numbers, this time using mangling.
(Note that multiple groups will be concatenated before mangling is performed, and that
mangling will only be performed on the basename version number, not any path version
numbers.)
version=4
opts="uversionmangle=s/^/0.0./" \
ftp://ftp.ibiblio.org/pub/Linux/ALPHA/wine/\
development/Wine-(.+)\.tar\.gz debian uupdate
sf.net
For SourceForge based projects, qa.debian.org runs a redirector which allows a simpler
form of URL. The format below will automatically be rewritten to use the redirector with
the watch file:
version=4
https://sf.net/<project>/ <tar-name>-(.+)\.tar\.gz debian uupdate
For audacity, set the watch file as:
version=4
https://sf.net/audacity/ audacity-minsrc-(.+)\.tar\.gz debian uupdate
Please note, you can still use normal functionalities of uscan to set up a watch file for
this site without using the redirector.
version=4
opts="uversionmangle=s/-pre/~pre/, \
filenamemangle=s%(?:.*)audacity-minsrc-(.+)\.tar\.xz/download%\
audacity-$1.tar.xz%" \
http://sourceforge.net/projects/audacity/files/audacity/(\d[\d\.]+)/ \
(?:.*)audacity-minsrc-([\d\.]+)\.tar\.xz/download debian uupdate
Here, % is used as the separator instead of the standard /.
github.com
For GitHub based projects, you can use the tags or releases page. The archive URL uses
only the version as the filename. You can rename the downloaded upstream tarball from
into the standard <project>-<version>.tar.gz using filenamemangle:
version=4
opts="filenamemangle=s%(?:.*?)?v?(\d[\d.]*)\.tar\.gz%<project>-$1.tar.gz%" \
https://github.com/<user>/<project>/tags \
(?:.*?/)?v?(\d[\d.]*)\.tar\.gz debian uupdate
PyPI
For PyPI based projects, pypi.debian.net runs a redirector which allows a simpler form of
URL. The format below will automatically be rewritten to use the redirector with the watch
file:
version=4
https://pypi.python.org/packages/source/<initial>/<project>/ \
<tar-name>-(.+)\.tar\.gz debian uupdate
For cfn-sphere, set the watch file as:
version=4
https://pypi.python.org/packages/source/c/cfn-sphere/ \
cfn-sphere-([\d\.]+).tar.gz debian uupdate
Please note, you can still use normal functionalities of uscan to set up a watch file for
this site without using the redirector.
version=4
opts="pgpmode=none" \
https://pypi.python.org/pypi/cfn-sphere/ \
https://pypi.python.org/packages/.*/.*/.*/\
cfn-sphere-([\d\.]+).tar.gz#.* debian uupdate
code.google.com
Sites which used to be hosted on the Google Code service should have migrated to elsewhere
(github?). Please look for the newer upstream site if available.
npmjs.org (node modules)
npmjs.org modules are published in JSON files. Here is a way to read them:
version=4
opts="searchmode=plain" \
https://registry.npmjs.org/aes-js \
https://registry.npmjs.org/aes-js/-/aes-js-(\d[\d\.]*)@ARCHIVE_EXT@
grouped package
Some node modules are split into multiple little upstream package. Here is a way to group
them:
version=4
opts="searchmode=plain,pgpmode=none" \
https://registry.npmjs.org/mongodb \
https://registry.npmjs.org/mongodb/-/mongodb-(\d[\d\.]*)@ARCHIVE_EXT@ group
opts="searchmode=plain,pgpmode=none,component=bson" \
https://registry.npmjs.org/bson \
https://registry.npmjs.org/bson/-/bson-(\d[\d\.]*)@ARCHIVE_EXT@ group
opts="searchmode=plain,pgpmode=none,component=mongodb-core" \
https://registry.npmjs.org/mongodb-core \
https://registry.npmjs.org/mongodb-core/-/mongodb-core-(\d[\d\.]*)@ARCHIVE_EXT@ group
opts="searchmode=plain,pgpmode=none,component=requireoptional" \
https://registry.npmjs.org/require_optional \
https://registry.npmjs.org/require_optional/-/require_optional-(\d[\d\.]*)@ARCHIVE_EXT@ group
Package version is then the concatenation of upstream versions separated by "+~".
direct access to the git repository (tags)
If the upstream only publishes its code via the git repository and its code has no web
interface to obtain the release tarball, you can use uscan with the tags of the git
repository to track and package the new upstream release.
version=4
opts="mode=git, gitmode=full, pgpmode=none" \
http://git.ao2.it/tweeper.git \
refs/tags/v([\d\.]+) debian uupdate
Please note "git ls-remote" is used to obtain references for tags.
If a tag v20.5 is the newest tag, the above example downloads spkg-20.5.tar.xz after
making a full clone of the git repository which is needed for dumb git server.
If tags are signed, set pgpmode=gittag to verify them.
direct access to the git repository (HEAD)
If the upstream only publishes its code via the git repository and its code has no web
interface nor the tags to obtain the released tarball, you can use uscan with the HEAD of
the git repository to track and package the new upstream release with an automatically
generated version string.
version=4
opts="mode=git, pgpmode=none" \
https://github.com/Debian/dh-make-golang \
HEAD debian uupdate
Please note that a local shallow copy of the git repository is made with "git clone --bare
--depth=1 ..." normally in the target directory. uscan generates the new upstream version
with "git log --date=format:%Y%m%d --pretty=0.0~git%cd.%h" on this local copy of
repository as its default behavior.
The generation of the upstream version string may the adjusted to your taste by adding
pretty and date options to the opts arguments.
direct access to the Subversion repository (tags)
If the upstream only publishes its code via the Subversion repository and its code has no
web interface to obtain the release tarball, you can use uscan with the tags of the
Subversion repository to track and package the new upstream release.
version=4
opts="mode=svn, pgpmode=none" \
svn://svn.code.sf.net/p/jmol/code/tags/ \
([\d.]+)\/ debian uupdate
direct access to the Subversion repository (HEAD)
If the upstream only publishes its code via the Subversion repository and its code has no
web interface to obtain the release tarball, you can use uscan to get the most recent
source of a subtree in the repository with an automatically generated version string.
version=4
opts="mode=svn, pgpmode=none" \
svn://svn.code.sf.net/p/jmol/code/trunk/ \
HEAD debian uupdate
By default, uscan generates the new upstream version by appending the revision number to
"0.0~svn". This can later be changed using uversionmangle.
COPYRIGHT FILE EXAMPLES
Here is an example for the debian/copyright file which initiates automatic repackaging of
the upstream tarball into <spkg>_<oversion>.orig.tar.gz (In debian/copyright, the Files-
Excluded and Files-Excluded-component stanzas are a part of the first paragraph and there
is a blank line before the following paragraphs which contain Files and other stanzas.):
Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Files-Excluded: exclude-this
exclude-dir
*/exclude-dir
.*
*/js/jquery.js
Files: *
Copyright: ...
...
Here is another example for the debian/copyright file which initiates automatic
repackaging of the multiple upstream tarballs into <spkg>_<oversion>.orig.tar.gz and
<spkg>_<oversion>.orig-bar.tar.gz:
Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Files-Excluded: exclude-this
exclude-dir
*/exclude-dir
.*
*/js/jquery.js
Files-Excluded-bar: exclude-this
exclude-dir
*/exclude-dir
.*
*/js/jquery.js
Files: *
Copyright: ...
...
See mk-origtargz(1).
KEYRING FILE EXAMPLES
Let's assume that the upstream "uscan test key (no secret) <none@debian.org>" signs its
package with a secret OpenPGP key and publishes the corresponding public OpenPGP key.
This public OpenPGP key can be identified in 3 ways using the hexadecimal form.
· The fingerprint as the 20 byte data calculated from the public OpenPGP key. E. g.,
'CF21 8F0E 7EAB F584 B7E2 0402 C77E 2D68 7254 3FAF'
· The long keyid as the last 8 byte data of the fingerprint. E. g., 'C77E2D6872543FAF'
· The short keyid is the last 4 byte data of the fingerprint. E. g., '72543FAF'
Considering the existence of the collision attack on the short keyid, the use of the long
keyid is recommended for receiving keys from the public key servers. You must verify the
downloaded OpenPGP key using its full fingerprint value which you know is the trusted one.
The armored keyring file debian/upstream/signing-key.asc can be created by using the gpg
(or gpg2) command as follows.
$ gpg --recv-keys "C77E2D6872543FAF"
...
$ gpg --finger "C77E2D6872543FAF"
pub 4096R/72543FAF 2015-09-02
Key fingerprint = CF21 8F0E 7EAB F584 B7E2 0402 C77E 2D68 7254 3FAF
uid uscan test key (no secret) <none@debian.org>
sub 4096R/52C6ED39 2015-09-02
$ cd path/to/<upkg>-<uversion>
$ mkdir -p debian/upstream
$ gpg --export --export-options export-minimal --armor \
'CF21 8F0E 7EAB F584 B7E2 0402 C77E 2D68 7254 3FAF' \
>debian/upstream/signing-key.asc
The binary keyring files, debian/upstream/signing-key.pgp and
debian/upstream-signing-key.pgp, are still supported but deprecated.
If a group of developers sign the package, you need to list fingerprints of all of them in
the argument for gpg --export ... to make the keyring to contain all OpenPGP keys of them.
Sometimes you may wonder who made a signature file. You can get the public keyid used to
create the detached signature file foo-2.0.tar.gz.asc by running gpg as:
$ gpg -vv foo-2.0.tar.gz.asc
gpg: armor: BEGIN PGP SIGNATURE
gpg: armor header: Version: GnuPG v1
:signature packet: algo 1, keyid C77E2D6872543FAF
version 4, created 1445177469, md5len 0, sigclass 0x00
digest algo 2, begin of digest 7a c7
hashed subpkt 2 len 4 (sig created 2015-10-18)
subpkt 16 len 8 (issuer key ID C77E2D6872543FAF)
data: [4091 bits]
gpg: assuming signed data in `foo-2.0.tar.gz'
gpg: Signature made Sun 18 Oct 2015 11:11:09 PM JST using RSA key ID 72543FAF
...
COMMANDLINE OPTIONS
For the basic usage, uscan does not require to set these options.
--conffile, --conf-file
Add or replace default configuration files ("/etc/devscripts.conf" and
"~/.devscripts"). This can only be used as the first option given on the command-line.
replace:
uscan --conf-file test.conf --verbose
add:
uscan --conf-file +test.conf --verbose
If one --conf-file has no "+", default configuration files are ignored.
--no-conf, --noconf
Don't read any configuration files. This can only be used as the first option given on
the command-line.
--no-verbose
Don't report verbose information. (default)
--verbose, -v
Report verbose information.
--debug, -vv
Report verbose information including the downloaded web pages as processed to STDERR
for debugging.
--dehs
Send DEHS style output (XML-type) to STDOUT, while send all other uscan output to
STDERR.
--no-dehs
Use only traditional uscan output format. (default)
--download, -d
Download the new upstream release. (default)
--force-download, -dd
Download the new upstream release even if up-to-date. (may not overwrite the local
file)
--overwrite-download, -ddd
Download the new upstream release even if up-to-date. (may overwrite the local file)
--no-download, --nodownload
Don't download and report information.
Previously downloaded tarballs may be used.
Change default to --skip-signature.
--signature
Download signature. (default)
--no-signature
Don't download signature but verify if already downloaded.
--skip-signature
Don't bother download signature nor verifying signature.
--safe, --report
Avoid running unsafe scripts by skipping both the repacking of the downloaded package
and the updating of the new source tree.
Change default to --no-download and --skip-signature.
When the objective of running uscan is to gather the upstream package status under the
security conscious environment, please make sure to use this option.
--report-status
This is equivalent of setting "--verbose --safe".
--download-version version
Specify the version which the upstream release must match in order to be considered,
rather than using the release with the highest version. (a best effort feature)
--download-debversion version
Specify the Debian package version to download the corresponding upstream release
version. The dversionmangle and uversionmangle rules are considered. (a best effort
feature)
--download-current-version
Download the currently packaged version. (a best effort feature)
--check-dirname-level N
See the below section "Directory name checking" for an explanation of this option.
--check-dirname-regex regex
See the below section "Directory name checking" for an explanation of this option.
--destdir path Normally, uscan changes its internal current directory to the package's
source directory where the debian/ is located. Then the destination directory for the
downloaded tarball and other files is set to the parent directory ../ from this internal
current directory.
This default destination directory can be overridden by setting --destdir option to a
particular path. If this path is a relative path, the destination directory is
determined in relative to the internal current directory of uscan execution. If this
path is a absolute path, the destination directory is set to path irrespective of the
internal current directory of uscan execution.
The above is true not only for the sinple uscan run in the single source tree but also
for the advanced scanning uscan run with subdirectories holding multiple source trees.
One exception is when --watchfile and --package are used together. For this case, the
internal current directory of uscan execution and the default destination directory
are set to the current directory . where uscan is started. The default destination
directory can be overridden by setting --destdir option as well.
--package package
Specify the name of the package to check for rather than examining debian/changelog;
this requires the --upstream-version (unless a version is specified in the watch file)
and --watchfile options as well. Furthermore, no directory scanning will be done and
nothing will be downloaded. This option automatically sets --no-download and
--skip-signature; and probably most useful in conjunction with the DEHS system (and
--dehs).
--upstream-version upstream-version
Specify the current upstream version rather than examine debian/watch or
debian/changelog to determine it. This is ignored if a directory scan is being
performed and more than one debian/watch file is found.
--watchfile watchfile
Specify the watchfile rather than perform a directory scan to determine it. If this
option is used without --package, then uscan must be called from within the Debian
package source tree (so that debian/changelog can be found simply by stepping up
through the tree).
One exception is when --watchfile and --package are used together. uscan can be
called from anywhare and the internal current directory of uscan execution and the
default destination directory are set to the current directory . where uscan is
started.
See more in the --destdir explanation.
--bare
Disable all site specific special case codes to perform URL redirections and page
content alterations.
--no-exclusion
Don't automatically exclude files mentioned in debian/copyright field Files-Excluded.
--pasv
Force PASV mode for FTP connections.
--no-pasv
Don't use PASV mode for FTP connections.
--no-symlink
Don't rename nor repack upstream tarball.
--timeout N
Set timeout to N seconds (default 20 seconds).
--user-agent, --useragent
Override the default user agent header.
--help
Give brief usage information.
--version
Display version information.
uscan also accepts following options and passes them to mk-origtargz:
--symlink
Make orig.tar.gz (with the appropriate extension) symlink to the downloaded files.
(This is the default behavior.)
--copy
Instead of symlinking as described above, copy the downloaded files.
--rename
Instead of symlinking as described above, rename the downloaded files.
--repack
After having downloaded an lzma tar, xz tar, bzip tar, gz tar, zip, jar, xpi archive,
repack it to the specified compression (see --compression).
The unzip package must be installed in order to repack zip and jar archives, the
mozilla-devscripts package must be installed to repack xpi archives, and the xz-utils
package must be installed to repack lzma or xz tar archives.
--compression [ gzip | bzip2 | lzma | xz ]
In the case where the upstream sources are repacked (either because --repack option is
given or debian/copyright contains the field Files-Excluded), it is possible to
control the compression method via the parameter. The default is gzip for normal
tarballs, and xz for tarballs generated directly from the git repository.
--copyright-file copyright-file
Exclude files mentioned in Files-Excluded in the given copyright-file. This is useful
when running uscan not within a source package directory.
DEVSCRIPT CONFIGURATION VARIABLES
For the basic usage, uscan does not require to set these configuration variables.
The two configuration files /etc/devscripts.conf and ~/.devscripts are sourced by a shell
in that order to set configuration variables. These may be overridden by command line
options. Environment variable settings are ignored for this purpose. If the first command
line option given is --noconf, then these files will not be read. The currently recognized
variables are:
USCAN_DOWNLOAD
Download or report only:
no: equivalent to --no-download, newer upstream files will not be downloaded.
yes: equivalent to --download, newer upstream files will be downloaded. This is the
default behavior.
See also --force-download and --overwrite-download.
USCAN_SAFE
If this is set to yes, then uscan avoids running unsafe scripts by skipping both the
repacking of the downloaded package and the updating of the new source tree; this is
equivalent to the --safe options; this also sets the default to --no-download and
--skip-signature.
USCAN_PASV
If this is set to yes or no, this will force FTP connections to use PASV mode or not
to, respectively. If this is set to default, then Net::FTP(3) makes the choice
(primarily based on the FTP_PASSIVE environment variable).
USCAN_TIMEOUT
If set to a number N, then set the timeout to N seconds. This is equivalent to the
--timeout option.
USCAN_SYMLINK
If this is set to no, then a pkg_version.orig.tar.{gz|bz2|lzma|xz} symlink will not be
made (equivalent to the --no-symlink option). If it is set to yes or symlink, then the
symlinks will be made. If it is set to rename, then the files are renamed (equivalent
to the --rename option).
USCAN_DEHS_OUTPUT
If this is set to yes, then DEHS-style output will be used. This is equivalent to the
--dehs option.
USCAN_VERBOSE
If this is set to yes, then verbose output will be given. This is equivalent to the
--verbose option.
USCAN_USER_AGENT
If set, the specified user agent string will be used in place of the default. This is
equivalent to the --user-agent option.
USCAN_DESTDIR
If set, the downloaded files will be placed in this directory. This is equivalent to
the --destdir option.
USCAN_REPACK
If this is set to yes, then after having downloaded a bzip tar, lzma tar, xz tar, or
zip archive, uscan will repack it to the specified compression (see --compression).
This is equivalent to the --repack option.
USCAN_EXCLUSION
If this is set to no, files mentioned in the field Files-Excluded of debian/copyright
will be ignored and no exclusion of files will be tried. This is equivalent to the
--no-exclusion option.
EXIT STATUS
The exit status gives some indication of whether a newer version was found or not; one is
advised to read the output to determine exactly what happened and whether there were any
warnings to be noted.
0 Either --help or --version was used, or for some watch file which was examined, a
newer upstream version was located.
1 No newer upstream versions were located for any of the watch files examined.
ADVANCED FEATURES
uscan has many other enhanced features which are skipped in the above section for the
simplicity. Let's check their highlights.
uscan actually scans not just the current directory but all its subdirectories looking for
debian/watch to process them all. See "Directory name checking".
uscan can be executed with path as its argument to change the starting directory of search
from the current directory to path .
If you are not sure what exactly is happening behind the scene, please enable the
--verbose option. If this is not enough, enable the --debug option too see all the
internal activities.
See "COMMANDLINE OPTIONS" and "DEVSCRIPT CONFIGURATION VARIABLES" for other variations.
Custom script
The optional script parameter in debian/watch means to execute script with options after
processing this line if specified.
See "HISTORY AND UPGRADING" for how uscan invokes the custom script.
For compatibility with other tools such as git-buildpackage, it may not be wise to create
custom scripts with random behavior. In general, uupdate is the best choice for the non-
native package and custom scripts, if created, should behave as if uupdate. For possible
use case, see <http://bugs.debian.org/748474> as an example.
URL diversion
Some popular web sites changed their web page structure causing maintenance problems to
the watch file. There are some redirection services created to ease maintenance of the
watch file. Currently, uscan makes automatic diversion of URL requests to the following
URLs to cope with this situation.
· <http://sf.net>
· <http://pypi.python.org>
Directory name checking
Similarly to several other scripts in the devscripts package, uscan explores the requested
directory trees looking for debian/changelog and debian/watch files. As a safeguard
against stray files causing potential problems, and in order to promote efficiency, it
will examine the name of the parent directory once it finds the debian/changelog file, and
check that the directory name corresponds to the package name. It will only attempt to
download newer versions of the package and then perform any requested action if the
directory name matches the package name. Precisely how it does this is controlled by two
configuration file variables DEVSCRIPTS_CHECK_DIRNAME_LEVEL and
DEVSCRIPTS_CHECK_DIRNAME_REGEX, and their corresponding command-line options
--check-dirname-level and --check-dirname-regex.
DEVSCRIPTS_CHECK_DIRNAME_LEVEL can take the following values:
0 Never check the directory name.
1 Only check the directory name if we have had to change directory in our search for
debian/changelog, that is, the directory containing debian/changelog is not the
directory from which uscan was invoked. This is the default behavior.
2 Always check the directory name.
The directory name is checked by testing whether the current directory name (as determined
by pwd(1)) matches the regex given by the configuration file option
DEVSCRIPTS_CHECK_DIRNAME_REGEX or by the command line option --check-dirname-regex regex.
Here regex is a Perl regex (see perlre(3perl)), which will be anchored at the beginning
and the end. If regex contains a /, then it must match the full directory path. If not,
then it must match the full directory name. If regex contains the string package, this
will be replaced by the source package name, as determined from the debian/changelog. The
default value for the regex is: package(-.+)?, thus matching directory names such as
package and package-version.
HISTORY AND UPGRADING
This section briefly describes the backwards-incompatible watch file features which have
been added in each watch file version, and the first version of the devscripts package
which understood them.
Pre-version 2
The watch file syntax was significantly different in those days. Don't use it. If you
are upgrading from a pre-version 2 watch file, you are advised to read this manpage
and to start from scratch.
Version 2
devscripts version 2.6.90: The first incarnation of the current style of watch files.
Version 3
devscripts version 2.8.12: Introduced the following: correct handling of regex special
characters in the path part, directory/path pattern matching, version number in
several parts, version number mangling. Later versions have also introduced URL
mangling.
If you are upgrading from version 2, the key incompatibility is if you have multiple
groups in the pattern part; whereas only the first one would be used in version 2,
they will all be used in version 3. To avoid this behavior, change the non-version-
number groups to be (?: ... ) instead of a plain ( ... ) group.
· uscan invokes the custom script as "script --upstream-version version
../spkg_version.orig.tar.gz".
· uscan invokes the standard uupdate as "uupdate --no-symlink --upstream-version
version ../spkg_version.orig.tar.gz".
Version 4
devscripts version 2.15.10: The first incarnation of watch files supporting multiple
upstream tarballs.
The syntax of the watch file is relaxed to allow more spaces for readability.
If you have a custom script in place of uupdate, you may also encounter problems
updating from Version 3.
· uscan invokes the custom script as "script --upstream-version version".
· uscan invokes the standard uupdate as "uupdate --find --upstream-version version".
Restriction for --dehs is lifted by redirecting other output to STDERR when it is
activated.
SEE ALSO
dpkg(1), mk-origtargz(1), perlre(1), uupdate(1), devscripts.conf(5)
AUTHOR
The original version of uscan was written by Christoph Lameter <clameter@debian.org>.
Significant improvements, changes and bugfixes were made by Julian Gilbey
<jdg@debian.org>. HTTP support was added by Piotr Roszatycki <dexter@debian.org>. The
program was rewritten in Perl by Julian Gilbey. Xavier Guimard converted it in object-
oriented Perl using Moo.