NAME

       dpkg-parsechangelog - parse Debian changelog files

SYNOPSIS

       dpkg-parsechangelog [option...]

DESCRIPTION

       dpkg-parsechangelog reads and parses the changelog of an unpacked Debian source tree and outputs the
       information in it to standard output in a machine-readable form.

OPTIONS

       -l, --file changelog-file
           Specifies the changelog file to read information from.  A ‘-’ can be used to specify reading from
           standard input.  The default is debian/changelog.

       -F changelog-format
           Specifies the format of the changelog.  By default the format is read from a special line near the
           bottom of the changelog or failing that defaults to the debian standard format.  See also "CHANGELOG
           FORMATS".

       -L libdir
           Obsolete option without effect (since dpkg 1.18.8).  Setting the perl environment variables PERL5LIB
           or PERLLIB has a similar effect when looking for the parser perl modules.

       -S, --show-field field
           Specifies the name of the field to show (since dpkg 1.17.0).  The field name is not printed, only its
           value.

       -?, --help
           Show the usage message and exit.

       --version
           Show the version and exit.

   Parser Options
       The following options can be used to influence the output of the changelog parser, for example the range
       of entries or the format of the output.

       --format output-format
           Set the output format.  Currently supported values are dpkg and rfc822.  dpkg is the classic output
           format (from before this option existed) and the default.  It consists of one stanza in Debian
           control format (see deb-control(5)).  If more than one entry is requested, then most fields are taken
           from the first entry (usually the most recent entry), except otherwise stated:

           Source: pkg-name
               The source package name.

           Version: version
               The source version number.  Note: For binary-only releases there might be no corresponding source
               release.

           Distribution: target-distribution
               A space-separated list of one or more distribution names where this version should be installed
               when it is uploaded.

           Urgency: urgency
               The highest urgency of all included entries is used, followed by the concatenated (space-
               separated) comments from all the versions requested.

           Maintainer: author
               The name and email address of the person who prepared these changes, they are not necessarily
               those of the uploader or the usual package maintainer.

           Date: date
               The date of the entry as a string, as it appears in the changelog.  With a strptime(3) format
               "%a, %d %b %Y %T %z", but where the day of the week might not actually correspond to the real day
               obtained from the rest of the date string.  If you need a more accurate representation of the
               date, use the Timestamp field, but take into account it might not be possible to map it back to
               the exact value in this field.

           Timestamp: timestamp
               The date of the entry as a timestamp in seconds since the epoch (since dpkg 1.18.8).

           Closes: bug-number
               The Closes fields of all included entries are merged.

           Changes: changelog-entries
               The text of all changelog entries is concatenated.  To make this field a valid Debian control
               format multiline field empty lines are replaced with a single full stop and all lines is intended
               by one space character.  The exact content depends on the changelog format.

           The Version, Distribution, Urgency, Maintainer and Changes fields are mandatory.

           There might be additional user-defined fields present.

           The rfc822 format uses the same fields but outputs a separate stanza for each changelog entry so that
           all metadata for each entry is preserved.

       --reverse
           Include all changes in reverse order (since dpkg 1.19.1).

           Note: For the dpkg format the first entry will be the most ancient entry.

       --all
           Include all changes.  Note: Other options have no effect when this is in use.

       -s, --since version
       -v version
           Include all changes later than version.

       -u, --until version
           Include all changes earlier than version.

       -f, --from version
           Include all changes equal or later than version.

       -t, --to version
           Include all changes up to or equal than version.

       -c, --count number
       -n number
           Include number entries from the top (or the tail if number is lower than 0).

       -o, --offset number
           Change the starting point for --count, counted from the top (or the tail if number is lower than 0).

CHANGELOG FORMATS

       It is possible to use a different format to the standard one, by providing a parser for that alternative
       format.

       In order to have dpkg-parsechangelog run the new parser, a line must be included within the last 40 lines
       of the changelog file, matching the Perl regular expression: “\schangelog-format:\s+([0-9a-z]+)\W”.  The
       part in parentheses should be the name of the format.  For example:

           @@@ changelog-format: otherformat @@@

       Changelog format names are non-empty strings of lowercase alphanumerics (“a-z0-9”).

       If such a line exists then dpkg-parsechangelog will look for the parser as a Dpkg::Changelog::Otherformat
       perl module; it is an error for it not being present.  The parser name in the perl module will be
       automatically capitalized.  The default changelog format is debian, and a parser for it is provided by
       default.

       The parser should be derived from the Dpkg::Changelog class and implement the required documented
       interface.

       If the changelog format which is being parsed always or almost always leaves a blank line between
       individual change notes, these blank lines should be stripped out, so as to make the resulting output
       compact.

       If the changelog format does not contain date or package name information this information should be
       omitted from the output.  The parser should not attempt to synthesize it or find it from other sources.

       If the changelog does not have the expected format the parser should error out, rather than trying to
       muddle through and possibly generating incorrect output.

       A changelog parser may not interact with the user at all.

NOTES

       All Parser Options except for -v are only supported since dpkg 1.14.16.

       Short option parsing with non-bundled values available only since dpkg 1.18.0.

ENVIRONMENT

       DPKG_COLORS
           Sets the color mode (since dpkg 1.18.5).  The currently accepted values are: auto (default), always
           and never.

       DPKG_NLS
           If set, it will be used to decide whether to activate Native Language Support, also known as
           internationalization (or i18n) support (since dpkg 1.19.0).  The accepted values are: 0 and 1
           (default).

FILES

       debian/changelog
           The changelog file, used to obtain version-dependent information about the source package, such as
           the urgency and distribution of an upload, the changes made since a particular release, and the
           source version number itself.

BUGS

       The Maintainer field has a confusing name matching the field in the debian/control file but not its exact
       semantics, where its meaning would be better represented by the Changed-By field name used in the
       .changes file.

SEE ALSO

       deb-changelog(5).