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alidist

Recipes to build ALICE SW

Guidelines for commit messages

  • Keep the first line of the commit below 50 chars
  • Leave the second line empty
  • Try to keep the lines after the third below 72 chars
  • Use some imperative verb as first word of the first line
  • Do not end the first line with a full-stop (i. e. .)
  • Make sure you squash / cleanup your commits when it makes sense (e.g. if they are really one the fix of the other). Keep history clean.

Example:

Fix issue in Geant4

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea
commodo consequat.

Guidelines for contributing recipes

  • Keep things simple (but concise).
  • Use 2 spaces to indent them.
  • Try avoid "fix typo" commits and squash history whenever makes sense.
  • Avoid touching $SOURCEDIR. If your recipe needs to compile in source, first copy them to $BUILDIR via:
rsync -a $SOURCEDIR ./
  • If a package is a toolkit not really affecting physics performance, make sure you provide a prefer_system_check rule to have laptop user pick it up from the system.
  • If a package is a physics related one. Avoid providing a prefer_system_check unless explicitly discussed withing the Computing Board or the O2 Technical board.
  • If SOMETHING_VERSION or SOMETHING_REVISION is defined, you can assume SOMETHING_ROOT is defined and points to an aliBuild built package. However the opposite is not true. I.e. you should not assume that SOMETHING_ROOT being defined means that a something was built with aliBuild (it could come from the system) and you cannot assume that SOMETHING_VERSION and SOMETHING_REVISION are set.
  • If a package can / could be picked up from the system, do not provide, in the modulefile, any variable which is not also exposed in general by the system installation. E.g. ROOTSYS is fine because that kind of a standard for ROOT installations, GCC_ROOT is not because GCC in general does not use GCC_ROOT.
  • When picking up a system dependency installed with homebrew, make sure you override the SOMETHING_ROOT variable when it's not set by using brew --prefix.
case $ARCHITECTURE in
  osx)
[ ! $BOOST_ROOT ] || BOOST_ROOT=$(brew --prefix boost)
  ;;
esac

Then use such a variable to pass the information optionally to, e.g., CMake.

cmake ...                                   \
  ${BOOST_ROOT:+-DBOOST_ROOT=$BOOST_ROOT}

This will make sure that if a package was selected to be picked up by the system (i.e. BOOST_ROOT is not set), we will look it up in the package specific folder when using homebrew.

You should never set any SOMETHING_ROOT variable to /usr/local because that is a global folder and it will make it have precendence in the lookup, therefore potentially implicitly bringing in incompatible versions of external packages.

Guidelines for handling externals sources

Whenever you need to build a new external, you should consider the following:

  • If a Git / GitHub mirror exists, and no patches are required, use it for the package source.

  • If a Git / GitHub repository exists and you need to patch it, fork it, decide a fork point, possibly based on a tag or eventually a commit hash, and create a branch in your fork called alice/<fork-point>. This can be done with:

    git checkout -b alice/<fork-point> <fork-point>
    

    patches should be applied on such a branch. You should then tag your development as: <version>-alice<x> where <x> is an incremental number for a given official <version>.

  • If no git repository is available, or if mirroring the whole repository is not desirable, create a repository with a master branch. On the master branch import relevant released tarballs, one commit per tarball. Make sure you tag the commit with the tag of the tarball. E.g.:

    git clone https://github.com/alisw/mysoft
    curl -O https://mysoftware.com/mysoft-version.tar.gz
    tar xzvf mysoft-version.tar.gz
    rsync -a --delete --exclude '**/.git' mysoft-version/ mysoft/
    cd mysoft
    git add -A .
    git commit -a -m 'Import https://mysoftware.com/mysoft-<version>.tar.gz'
    git tag <version>
    

    In case you need to add a patch on top of a tarball, create a branch with:

    git checkout -b alice/<version> <version>
    

    and add your patches on such a branch. You should then tag your development as: <version>-alice<x> where <x> is an incremental number for a given official <version>.

  • Do not create extra branches unless you do need to patch the original sources.

Moreover try to keep the package name (as specified inside the recipe in the package field of the header) and the repository name the same, including capitalization.

Request a new package

Please open a JIRA issue with your request at:

https://alice.its.cern.ch/jira/secure/CreateIssue!default.jspa

Make sure you select "Dependencies" as component.

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