Difference between revisions of "VCS package guidelines"

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{{hc|<nowiki>
 
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pkgver() {
 
pkgver() {
   cd "$srcdir/$pkgname"
+
   cd "$srcdir$pkgname"
 
   ( set -o pipefail
 
   ( set -o pipefail
 
     git describe --long --tags 2>/dev/null | sed 's/\([^-]*-g\)/r\1/;s/-/./g' ||
 
     git describe --long --tags 2>/dev/null | sed 's/\([^-]*-g\)/r\1/;s/-/./g' ||

Revision as of 17:19, 4 March 2015

zh-CN:VCS PKGBUILD Guidelines zh-TW:VCS PKGBUILD Guidelines

Package creation guidelines

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Version control systems can be used for retrieval of source code for both usual statically versioned packages and latest (trunk) version of a development branch. This article covers both cases.

Prototypes

Warning: The prototype files provided in the abs package and in the ABS Git repository are significantly out-of-date. Do not consider the prototypes to be authoritative in any way. See FS#34485.

The abs package for the Arch Build System provides prototypes for CVS, SVN, Git, Mercurial, and Darcs PKGBUILDs. When abs is installed, you can find them in /usr/share/pacman. Latest versions can be found in the prototypes directory in the ABS Git repository.

Guidelines

  • Suffix pkgname with -cvs, -svn, -hg, -darcs, -bzr, -git etc. unless the package fetches a specific release.
  • If the resulting package is different after changing the dependencies, URL, sources, etc. increasing the pkgrel is mandatory. Touching the pkgver is not.
  • Include what the package conflicts with and provides (e.g. for fluxbox-gitAUR: conflicts=('fluxbox') and provides=('fluxbox')).
  • replaces=() generally causes unnecessary problems and should be avoided.
  • When using the cvsroot, use anonymous:@ rather than anonymous@ to avoid having to enter a blank password or anonymous:password@, if one is required.
  • Because the sources are not static, skip the checksum in md5sums=() by adding 'SKIP'.

VCS sources

Note: Pacman 4.1 supports the following VCS sources: bzr, git, hg and svn. See the fragment section of man PKGBUILD or PKGBUILD(5) for a list of supported VCS.

Starting with pacman 4.1, the VCS sources should be specified in the source=() array and will be treated like any other source. makepkg will clone/checkout/branch the repository into $SRCDEST (same as $startdir if not set in makepkg.conf(5)) and copy it to $srcdir (in a specific way to each VCS). The local repository is left untouched, thus invalidating the need for a -build directory.

The general format of a VCS source=() array is:

source=('[folder::][vcs+]url[#fragment]')
  • folder (optional) is used to change the default repository name to something more relevant (e.g. than trunk) or to preserve the previous sources.
  • vcs+ is needed for URLs that do not reflect the VCS type, e.g. git+http://some_repo.
  • url is the URL to the distant or local repository.
  • #fragment (optional) is needed to pull a specific branch or commit. See man PKGBUILD for more information on the fragments available for each VCS.

An example Git source array:

source=('project_name::git+http://project_url#branch=project_branch')

The pkgver() function

The pkgver autobump is now achieved via a dedicated pkgver() function. This allows for better control over the pkgver, and maintainers should favor a pkgver that makes sense.

To use pkgver(), you still need to declare the pkgver variable with the most recent value. makepkg will invoke function pkgver(), and update variable pkgver accordingly.

It is recommended to have following version format: RELEASE.rREVISION where REVISION is a monotonically increasing number that uniquely identifies the source tree (VCS revisions do this). If there are no public releases and no repository tags then zero could be used as a release number or you can drop RELEASE completely and use version number that looks like rREVISION. If there are public releases but repo has no tags then the developer should get the release version somehow e.g. by parsing the project files.

The revision number delimiter ("r" right before REVISION) is important. This delimiter allows to avoid problems in case if upstream decides to make its first release or uses versions with different number of components. E.g. if at revision "455" upstream decides to release version 0.1 then the revision delimiter preserves version monotonicity - 0.1.r456 > r454. Without the delimiter monotonicity fails - 0.1.456 < 454.

Following are some examples showing the intended output:

Git

Use the most recent tag reachable from the last commit. If there are no tags then use number of revisions since beginning of the history.

pkgver() {
  cd "$srcdir$pkgname"
  ( set -o pipefail
    git describe --long --tags 2>/dev/null | sed 's/\([^-]*-g\)/r\1/;s/-/./g' ||
    printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
  )
}
0.9.9.r27.g2b039da

# or, if no tags,
r1581.2b039da

If tag contains a prefix, like v or project name then it should be cut off:

# cutting off 'FOO-' prefix in the git tag
git describe --long | sed 's/^FOO-//;s/\([^-]*-g\)/r\1/;s/-/./g'
6.1.r3.gd77e105

Subversion

pkgver() {
  cd "$pkgname"
  local ver="$(svnversion)"
  printf "r%s" "${ver//[[:alpha:]]}"
}
r8546
Note: If the project has releases you should use them instead of the 0..

Mercurial

pkgver() {
  cd "$pkgname"
  printf "r%s.%s" "$(hg identify -n)" "$(hg identify -i)"
}
r2813.75881cc5391e

Bazaar

pkgver() {
  cd "$pkgname"
  printf "r%s" "$(bzr revno)"
}
r830

Fallback

In case no satisfactory pkgver can be extracted from the repository, the current date can be used:

pkgver() {
  date +%Y%m%d
}
20130408

Although it does not identify source tree state uniquely, so avoid it if possible.

Tips

Git Submodules

Git submodules are a little tricky to do. The idea is to add the URLs of the submodules themselves directly to the sources array and then reference them during prepare(). This could look like this:

source=("git://somewhere.org/something/something.git"
        "git://somewhere.org/mysubmodule/mysubmodule.git")

prepare() {
  cd something
  git submodule init
  git config submodule.mysubmodule.url $srcdir/mysubmodule
  git submodule update
}