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NAME
reltool - Main API of the Reltool application
DESCRIPTION
This is an interface module for the Reltool application.
Reltool is a release management tool. It analyses a given Erlang/OTP installation and determines various
dependencies between applications. The graphical frontend depicts the dependencies and enables
interactive customization of a target system. The backend provides a batch interface for generation of
customized target systems.
The tool uses an installed Erlang/OTP system as input. root_dir is the root directory of the analysed
system and it defaults to the system executing reltool. Applications may also be located outside
root_dir. lib_dirs defines library directories where additional applications may reside and it defaults
to the directories listed by the operating system environment variable ERL_LIBS. See the module code for
more info.
An application directory AppDir under a library directory is recognized by the existence of an
AppDir/ebin directory. If this does not exist, reltool will not consider AppDir at all when looking for
applications.
It is recommended that application directories are named as the application, possibly followed by a dash
and the version number. For example myapp or myapp-1.1.
Finally single modules and entire applications may be read from Escripts.
Some configuration parameters control the behavior of Reltool on system (sys) level. Others provide
control on application (app) level and yet others are on module (mod) level. Module level parameters
override application level parameters and application level parameters override system level parameters.
Escript escript level parameters override system level parameters.
The following top level options are supported:
config:
This is the main option and it controls the configuration of reltool. It can either be a sys tuple or
a name of a file containing a sys tuple.
trap_exit:
This option controls the error handling behavior of reltool. By default the window processes traps
exit, but this behavior can altered by setting trap_exit to false.
wx_debug:
This option controls the debug level of wx. As its name indicates it is only useful for debugging.
See wx:debug/1 for more info.
Besides the already mentioned source parameters root_dir and lib_dirs, the following system (sys) level
options are supported:
erts:
Erts specific configuration. See application level options below.
escript:
Escript specific configuration. An escript has a mandatory file name and escript level options that
are described below.
app:
Application specific configuration. An application has a mandatory name and application level options
that are described below.
mod_cond:
This parameter controls the module inclusion policy. It defaults to all which means that if an
application is included (either explicitly or implicitly) all modules in that application will be
included. This implies that both modules that exist in the ebin directory of the application, as well
as modules that are named in the app file will be included. If the parameter is set to ebin, both
modules in the ebin directory and derived modules are included. If the parameter is set to app, both
modules in the app file and derived modules are included. derived means that only modules that are
used by other included modules are included. The mod_cond setting on system level is used as default
for all applications.
incl_cond:
This parameter controls the application and escript inclusion policy. It defaults to derived which
means that the applications that do not have any explicit incl_cond setting, will only be included if
any other (explicitly or implicitly included) application uses it. The value include implies that all
applications and escripts that do not have any explicit incl_cond setting will be included. exclude
implies that all applications and escripts that do not have any explicit incl_cond setting will be
excluded.
boot_rel:
A target system may have several releases but the one given as boot_rel will be used as default when
the system is booting up.
rel:
Release specific configuration. Each release maps to a rel, script and boot file. See the module
systools for more info about the details. Each release has a name, a version and a set of
applications with a few release specific parameters such as type and included applications.
relocatable:
This parameter controls whether the erl executable in the target system should automatically
determine where it is installed or if it should use a hardcoded path to the installation. In the
latter case the target system must be installed with reltool:install/2 before it can be used. If the
system is relocatable, the file tree containing the target system can be moved to another location
without re-installation. The default is true.
profile:
The creation of the specification for a target system is performed in two steps. In the first step a
complete specification is generated. It will likely contain much more files than you are interested
in in your customized target system. In the second step the specification will be filtered according
to your filters. There you have the ability to specify filters per application as well as system wide
filters. You can also select a profile for your system. Depending on the profile, different default
filters will be used. There are three different profiles to choose from: development, embedded and
standalone. development is default. The parameters that are affected by the profile are:
incl_sys_filters, excl_sys_filters, incl_app_filters and excl_app_filters.
app_file:
This parameter controls the default handling of the app files when a target system is generated. It
defaults to keep which means that app files are copied to the target system and their contents are
kept as they are. strip means that a new app file is generated from the contents of the original app
file where the non included modules are removed from the file. all does also imply that a new app
file is generated from the contents of the original app file, with the difference that all included
modules are added to the file. If the application does not have any app file a file will be created
for all but not for keep and strip.
debug_info:
The debug_info parameter controls whether the debug information in the beam file should be kept
(keep) or stripped strip when the file is copied to the target system.
excl_lib:
Warning:
This option is experimental.
If the excl_lib option is set to otp_root then reltool will not copy anything from the Erlang/OTP
installation ($OTP_ROOT) into the target structure. The goal is to create a "slim" release which can
be used together with an existing Erlang/OTP installation. The target structure will therefore only
contain a lib directory with the applications that were found outside of $OTP_ROOT (typically your
own applications), and a releases directory with the generated .rel, .script and .boot files.
When starting this release, three things must be specified:
Which releases directory to use :
Tell the release handler to use the releases directory in our target structure instead of
$OTP_ROOT/releases. This is done by setting the SASL environment variable releases_dir, either from
the command line (-sasl releases_dir <target-dir>/releases) or in sys.config.
Which boot file to use :
The default boot file is $OTP_ROOT/bin/start, but in this case we need to specify a boot file from
our target structure, typically <target-dir>/releases/<vsn>/<RelName>. This is done with the -boot
command line option to erl
The location of our applications :
The generated .script (and .boot) file uses the environment variable $RELTOOL_EXT_LIB as prefix for
the paths to all applications. The -boot_var option to erl can be used for specifying the value of
this variable, typically -boot_var RELTOOL_EXT_LIB <target-dir>/lib.
Example:
erl -sasl releases_dir \"mytarget/releases\" -boot mytarget/releases/1.0/myrel\
-boot_var RELTOOL_EXT_LIB mytarget/lib
incl_sys_filters:
This parameter normally contains a list of regular expressions that controls which files in the
system should be included. Each file in the target system must match at least one of the listed
regular expressions in order to be included. Further the files may not match any filter in
excl_sys_filters in order to be included. Which application files should be included is controlled
with the parameters incl_app_filters and excl_app_filters. This parameter defaults to [".*"].
excl_sys_filters:
This parameter normally contains a list of regular expressions that controls which files in the
system should not be included in the target system. In order to be included, a file must match some
filter in incl_sys_filters but not any filter in excl_sys_filters. This parameter defaults to [].
incl_app_filters:
This parameter normally contains a list of regular expressions that controls which application
specific files that should be included. Each file in the application must match at least one of the
listed regular expressions in order to be included. Further the files may not match any filter in
excl_app_filters in order to be included. This parameter defaults to [".*"].
excl_app_filters:
This parameter normally contains a list of regular expressions that controls which application
specific files should not be included in the target system. In order to be included, a file must
match some filter in incl_app_filters but not any filter in excl_app_filters. This parameter defaults
to [].
incl_archive_filters:
This parameter normally contains a list of regular expressions that controls which top level
directories in an application should be included in an archive file (as opposed to being included as
a regular directory outside the archive). Each top directory in the application must match at least
one of the listed regular expressions in order to be included. Further the files may not match any
filter in excl_app_filters in order to be included. This parameter defaults to [".*"].
excl_archive_filters:
This parameter normally contains a list of regular expressions that controls which top level
directories in an application should not be included in an archive file. In order to be included in
the application archive, a top directory must match some filter in incl_archive_filters but not any
filter in excl_archive_filters. This parameter defaults to ["^include$","^priv$"].
archive_opts:
This parameter contains a list of options that are given to zip:create/3 when application specific
files are packaged into an archive. Only a subset of the options are supported. The most useful
options in this context are the ones that control which types of files should be compressed. This
parameter defaults to [].
On application (escript) level, the following options are supported:
incl_cond:
The value of this parameter overrides the parameter with the same name on system level.
On application (app) level, the following options are supported:
vsn:
The version of the application. In an installed system there may exist several versions of an
application. The vsn parameter controls which version of the application will be chosen.
This parameter is mutual exclusive with lib_dir. If vsn and lib_dir are both omitted, the latest
version will be chosen.
Note that in order for reltool to sort application versions and thereby be able to select the latest,
it is required that the version id for the application consits of integers and dots only, for example
1, 2.0 or 3.17.1.
lib_dir:
The directory to read the application from. This parameter can be used to point out a specific
location to fetch the application from. This is useful for instance if the parent directory for some
reason is no good as a library directory on system level.
This parameter is mutual exclusive with vsn. If vsn and lib_dir are both omitted, the latest version
will be chosen.
Note that in order for reltool to sort application versions and thereby be able to select the latest,
it is required that the version id for the application consits of integers and dots only, for example
1, 2.0 or 3.17.1.
mod:
Module specific configuration. A module has a mandatory name and module level options that are
described below.
mod_cond:
The value of this parameter overrides the parameter with the same name on system level.
incl_cond:
The value of this parameter overrides the parameter with the same name on system level.
app_file:
The value of this parameter overrides the parameter with the same name on system level.
debug_info:
The value of this parameter overrides the parameter with the same name on system level.
incl_app_filters:
The value of this parameter overrides the parameter with the same name on system level.
excl_app_filters:
The value of this parameter overrides the parameter with the same name on system level.
incl_archive_filters:
The value of this parameter overrides the parameter with the same name on system level.
excl_archive_filters:
The value of this parameter overrides the parameter with the same name on system level.
archive_opts:
The value of this parameter overrides the parameter with the same name on system level.
On module (mod) level, the following options are supported:
incl_cond:
This parameter controls whether the module is included or not. By default the mod_cond parameter on
application and system level will be used to control whether the module is included or not. The value
of incl_cond overrides the module inclusion policy. include implies that the module is included,
while exclude implies that the module is not included. derived implies that the module is included if
it is used by any other included module.
debug_info:
The value of this parameter overrides the parameter with the same name on application level.
DATA TYPES
options() = [option()]
option() = {config, config() | file()}
| {trap_exit, bool()}
| {wx_debug, term()}
config() = {sys, [sys()]}
sys() = {root_dir, root_dir()}
| {lib_dirs, [lib_dir()]}
| {profile, profile()}
| {erts, app()}
| {escript, escript_file(), [escript()]}
| {app, app_name(), [app()]}
| {mod_cond, mod_cond()}
| {incl_cond, incl_cond()}
| {boot_rel, boot_rel()}
| {rel, rel_name(), rel_vsn(), [rel_app()]}
| {relocatable, relocatable()}
| {app_file, app_file()}
| {debug_info, debug_info()}
| {incl_sys_filters, incl_sys_filters()}
| {excl_sys_filters, excl_sys_filters()}
| {incl_app_filters, incl_app_filters()}
| {excl_app_filters, excl_app_filters()}
| {incl_archive_filters, incl_archive_filters()}
| {excl_archive_filters, excl_archive_filters()}
| {archive_opts, [archive_opt()]}
app() = {vsn, app_vsn()}
| {lib_dir, lib_dir()}
| {mod, mod_name(), [mod()]}
| {mod_cond, mod_cond()}
| {incl_cond, incl_cond()}
| {debug_info, debug_info()}
| {app_file, app_file()}
| {excl_lib, excl_lib()}
| {incl_sys_filters, incl_sys_filters()}
| {excl_sys_filters, excl_sys_filters()}
| {incl_app_filters, incl_app_filters()}
| {excl_app_filters, excl_app_filters()}
| {incl_archive_filters, incl_archive_filters()}
| {excl_archive_filters, excl_archive_filters()}
| {archive_opts, [archive_opt()]}
mod() = {incl_cond, incl_cond()}
| {debug_info, debug_info()}
rel_app() = app_name()
| {app_name(), app_type()}
| {app_name(), [incl_app()]}
| {app_name(), app_type(), [incl_app()]}
app_name() = atom()
app_type() = permanent | transient | temporary | load | none
app_vsn() = string()
archive_opt = zip_create_opt()
boot_rel() = rel_name()
app_file() = keep | strip | all
debug_info() = keep | strip
dir() = string()
escript() = {incl_cond, incl_cond()}
escript_file() = file()
excl_app_filters() = regexps()
excl_archive_filters() = regexps()
excl_lib() = otp_root
excl_sys_filters() = regexps()
file() = string()
incl_app() = app_name()
incl_app_filters() = regexps()
incl_archive_filters() = regexps()
incl_cond() = include | exclude | derived
incl_sys_filters() = regexps()
lib_dir() = dir()
mod_cond() = all | app | ebin | derived | none
mod_name() = atom()
profile() = development | embedded | standalone
re_regexp() = string()
reason() = string()
regexps() = [re_regexp()]
| {add, [re_regexp()]}
| {del, [re_regexp()]}
rel_file() = term()
rel_name() = string()
rel_vsn() = string()
relocatable = boolean()
root_dir() = dir()
script_file() = term()
server() = server_pid() | options()
server_pid() = pid()
target_dir() = file()
window_pid() = pid()
base_dir() = dir()
base_file() = file()
top_dir() = file()
top_file() = file()
target_spec() = [target_spec()]
| {create_dir, base_dir(), [target_spec()]}
| {create_dir, base_dir(), top_dir(), [target_spec()]}
| {archive, base_file(), [archive_opt()], [target_spec()]}
| {copy_file, base_file()}
| {copy_file, base_file(), top_file()}
| {write_file, base_file(), iolist()}
| {strip_beam_file, base_file()}
EXPORTS
create_target(Server, TargetDir) -> ok | {error, Reason}
Types:
Server = server()
TargetDir = target_dir()
Reason = reason()
Create a target system. Gives the same result as {ok,TargetSpec}=reltool:get_target_spec(Server)
and reltool:eval_target_spec(TargetSpec,RootDir,TargetDir).
eval_target_spec(TargetSpec, RootDir, TargetDir) -> ok | {error, Reason}
Types:
TargetSpec = target_spec()
RootDir = root_dir()
TargetDir = target_dir()
Reason = reason()
Create the actual target system from a specification generated by reltool:get_target_spec/1. The
creation of the specification for a target system is performed in two steps. In the first step a
complete specification will be generated. It will likely contain much more files than you are
interested in in your target system. In the second step the specification will be filtered
according to your filters. There you have the ability to specify filters per application as well
as system wide filters. You can also select a profile for your system. Depending on the profile,
different default filters will be used.
The top directories bin, releases and lib are treated differently from other files. All other
files are by default copied to the target system. The releases directory contains generated rel,
script, and boot files. The lib directory contains the applications. Which applications are
included and if they should be customized (archived, stripped from debug info etc.) is specified
with various configuration parameters. The files in the bin directory are copied from the erts-
vsn/bin directory, but only those files that were originally included in the bin directory of the
source system.
If the configuration parameter relocatable was set to true there is no need to install the target
system with reltool:install/2 before it can be started. In that case the file tree containing the
target system can be moved without re-installation.
In most cases, the RootDir parameter should be set to the same as the root_dir configuration
parameter used in the call to reltool:get_target_spec/1 (or code:root_dir() if the configuration
parameter is not set). In some cases it might be useful to evaluate the same target specification
towards different root directories. This should, however, be used with great care as it requires
equivalent file structures under all roots.
get_config(Server) -> {ok, Config} | {error, Reason}
Types:
Server = server()
Config = config()
Reason = reason()
Get reltool configuration. Shorthand for reltool:get_config(Server,false,false).
get_config(Server, InclDefaults, InclDerived) -> {ok, Config} | {error, Reason}
Types:
Server = server()
InclDefaults = incl_defaults()
InclDerived = incl_derived()
Config = config()
Reason = reason()
Get reltool configuration. Normally, only the explicit configuration parameters with values that
differ from their defaults are interesting. But the builtin default values can be returned by
setting InclDefaults to true. The derived configuration can be returned by setting InclDerived to
true.
get_rel(Server, Relname) -> {ok, RelFile} | {error, Reason}
Types:
Server = server()
RelName = rel_name()
RelFile = rel_file()
Reason = reason()
Get contents of a release file. See rel(5) for more details.
get_script(Server, Relname) -> {ok, ScriptFile | {error, Reason}
Types:
Server = server()
RelName = rel_name()
ScriptFile = script_file()
Reason = reason()
Get contents of a boot script file. See script(5) for more details.
get_status(Server) -> {ok, [Warning]} | {error, Reason}
Types:
Server = server()
Warning = string()
Reason = reason()
Get status about the configuration
get_server(WindowPid) -> {ok, ServerPid} | {error, Reason}
Types:
WindowPid = window_pid()
ServerPid = server_pid()
Reason = reason()
Return the process identifier of the server process.
get_target_spec(Server) -> {ok, TargetSpec} | {error, Reason}
Types:
Server = server()
TargetSpec = target_spec()
Reason = reason()
Return a specification of the target system. The actual target system can be created with
reltool:eval_target_spec/3.
install(RelName, TargetDir) -> ok | {error, Reason}
Types:
RelName = rel_name()
TargetDir = target_dir()
Reason = reason()
Install a created target system
start() -> {ok, WindowPid} | {error, Reason}
Types:
WindowPid = window_pid()
Reason = reason()
Start a main window process with default options
start(Options) -> {ok, WindowPid} | {error, Reason}
Types:
Options = options()
WindowPid = window_pid()
Reason = reason()
Start a main window process with options
start_link(Options) -> {ok, WindowPid} | {error, Reason}
Types:
Options = options()
WindowPid = window_pid()
Reason = reason()
Start a main window process with options. The process is linked.
start_server(Options) -> {ok, ServerPid} | {error, Reason}
Types:
Options = options()
ServerPid = server_pid()
Reason = reason()
Start a server process with options. The server process identity can be given as an argument to
several other functions in the API.
stop(Pid) -> ok | {error, Reason}
Types:
Pid = server_pid() | window_pid()()
Reason = reason()
Stop a server or window process
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