Re: debian/rules and "git rev-list" in a subshell - Automatically retrieve upstream GIT repository using ISO date to package source tarball

[Miroslav Suchý <miroslav@suchy.cz>]

Dne 6.11.2010 14:09, Danai SAE-HAN (韓達耐) napsal(a):
> upstream_version := cjk-4.8.2+git20090105
> unixdate := 1231196400
>
> get-orig-source:
> 	git clone git://git.sv.gnu.org/cjk.git cjk-$(upstream_version)
> 	cd cjk-$(upstream_version)&&  git reset --hard $(shell cd
> cjk-$(upstream_version)&&  git rev-list --all -n 1
> --before=$(unixdate))
>
> In other words, I clone the GIT repository, and then want to revert it
> to a somewhat older version, based on the UNIX timestamp.  I open a
> subshell to get the hash of the latest GIT commit before the UNIX
> timestamp.

You may find some inspiration in Tito where we do something similar. 
There is no need to do "reset --hard", you can pass commit/tag directly 
to git "archive"

def get_commit_timestamp(sha1_or_tag):
    """
    Get the timestamp of the git commit or tag we're building. Used to
    keep the hash the same on all .tar.gz's we generate for a particular
    version regardless of when they are generated.
    """
    output = run_command(
            "git rev-list --timestamp --max-count=1 %s | awk '{print $1}'"
            % sha1_or_tag)
    return output


def create_tgz(git_root, prefix, commit, relative_dir, rel_eng_dir,
    dest_tgz):
    """
    Create a .tar.gz from a projects source in git.
    """
    os.chdir(os.path.abspath(git_root))
    timestamp = get_commit_timestamp(commit)

    timestamp_script = get_script_path("tar-fixup-stamp-comment.pl")

    # Accomodate standalone projects with specfile in root of git repo:
    relative_git_dir = "%s" % relative_dir
    if relative_git_dir == '/':
        relative_git_dir = ""

    archive_cmd = ('git archive --format=tar --prefix=%s/ %s:%s '
        '| grep -a -v "^%s/rel-eng/" | %s %s %s | gzip -n -c - | tee 
%s' % (
        prefix, commit, relative_git_dir, prefix, timestamp_script,
        timestamp, commit, dest_tgz))
    debug(archive_cmd)
    run_command(archive_cmd)


That tar-fixup-stamp-comment.pl can be find here:
https://github.com/dgoodwin/tito/blob/master/bin/tar-fixup-stamp-comment.pl
You can study rest of Tito here:
https://github.com/dgoodwin/tito
Tito is made to produce rpm files, but that part from git to tar.gz will 
be the same for Debian.

Miroslav Suchy