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The net result of this patch is to make available via Config.pm and -v/-V the
details about the git version info we have available for the build. When built within
a git repository git is queried directly. When built from a snapshot or bundle
it is assumed that the source is unchanged, and that the required details are
avaialble in a file called .patch, whose format current is a four field string
in the following format: "$branchname $date.$time $sha1 $describe". The
generator of these files currently resides on camel.booking.com.
* git-describe is now used more directly with -v.
When the prefix of git-describe matches the version number
as determined by the defines in patchlevel.h then we use ONLY
the git-describe output, otherwise we include
the git describe in parenthesis after the version number. Either way
the describe text is optionally followed by a star should there be
uncommitted changes.
eg: This is perl, v5.11.0 (GitLive-blead-136-g58ca560) built for i686-linux
or: This is perl, v5.11.0-1-g58ca560 built for i686-linux
or: This is perl, v5.11.0 built for i686-linux
* include the SHA1 in perl -V summary, and automatically include unpushed
commits in the registered patches list
* include various git/version/.patch details in %Config, as follows:
git_commit_id # sha1 of HEAD
git_ancestor # ancestor in $remote/$branch (presumably canonical)
git_describe # git describe
git_branch # current branch
git_uncommitted_changes # "true" if there are any, empty otherwise
git_unpushed_commits # List of sha1's of unpushed commits
git_commit_id_title # Used to make the perl -V summary output
Additionally one more value is added depending on build process used: when
building from an rsynced snapshot (or any dist including a file called
.patch) then the second field will be used to populate the
"git_snapshot_date" field. Otherwise if built in a git directory (as is hopefully
recommended these day) then the field will be "git_commit_date" which will be the
commit date of HEAD.
This patch introduces two new files (on top of .patchnum) that will be generated by
make_patchnum.sh: "lib/Config_git.pl" and "unpushed.h", the former is used to make
git data available to Config.pm/%Config without rebuilding everything else, and the
second is used to expose unpushed commits (if any) via the registered patch facility
of patchlevel.h
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