eliminate .patchnum and related infrastrcuture from *nix based build process

[p5sagit/p5-mst-13.2.git] / make_patchnum.sh

diff --git a/make_patchnum.sh b/make_patchnum.sh
index 2306fa8..9a8982f 100644 (file)
--- a/make_patchnum.sh
+++ b/make_patchnum.sh
@@ -1,11 +1,104 @@
 #!/bin/sh
 
-Existing=`cat .patchnum 2>/dev/null`
-Current=`git describe`
+# this script is used to regenerate a number of special build files
+# based on either information contained in a file called .patch or
+# directly from git.
+# The files involved are:
+#   .patchnum         # information about the current checkout
+#   lib/Config_git.pl # holds some special configure settings related to git
+#   unpushed.h        # header file used by patchlevel.h to store unpushed commits
 
-if [ "$Existing" != "$Current" ]; then
-       echo "Updating .patchnum"
-       echo $Current > .patchnum
+config_file="lib/Config_git.pl"
+header_file="git_version.h"
+patch_file=".patch"
+
+git_dir=`git rev-parse --git-dir 2>/dev/null`
+existing_config=`cat $config_file 2>/dev/null`
+existing_header=`cat $header_file 2>/dev/null`
+
+unpushed_commits='/*no-op*/'
+if [ -s $patch_file ] ; then
+       # this is the minimal expectation for the 
+       read branch snapshot_created commit_id describe < .patch
+       changed=""
+       extra_info="git_snapshot_date='$snapshot_created'"
+       commit_title='Snapshot of:'
+elif [ -n "$git_dir" ]; then
+       branch=`git branch | awk 'BEGIN{ORS=""} /^\* [^(]/ { print $2 }'`
+       test -n "$branch" && remote=`git config branch.$branch.remote`
+       test -n "$branch" && merge=`git config branch.$branch.merge | sed s,refs/heads/,,`
+       commit_id=`git rev-parse HEAD`
+       changed=`git diff-index --name-only HEAD`
+       describe=`git describe --tags`
+       commit_created=`git log -1 --pretty='format:%ci'`
+       extra_info="git_commit_date='$commit_created'"
+       if [ -n "$merge" ] && [ -n "$remote" ]; then
+               unpushed_commit_list=`git cherry $remote/$merge | awk 'BEGIN{ORS=","} /\+/ {print $2}' | sed -e 's/,$//'`
+               unpushed_commits=`git cherry $remote/$merge | awk 'BEGIN{ORS="\t\\\\\n"} /\+/ {print ",\"" $2 "\""}'`
+
+               if [ -n "$unpushed_commits" ]; then
+                       commit_title="Local Commit:"
+                       ancestor=`git rev-parse $remote/$merge`
+                       extra_info="$extra_info
+git_ancestor='$ancestor'
+git_remote_branch='$remote/$merge'
+git_unpushed='$unpushed_commit_list'"
+               fi
+                       
+       fi
+else
+       cat <<SNDOGS
+Something is wrong with your source tree. You should 
+either have a .git directory and a functional git toolset
+OR should have a .patch file in the source tree. Please
+report the particulars of this situation to 
+perl5-porters@perl.org.
+SNDOGS
+       exit 2
+fi
+
+# Set up defaults for various values
+if [ -n "$changed" ]; then
+       changed="true"
+       commit_title="Derived from:"
+       status="#define PERL_GIT_UNCOMMITTED_CHANGES uncommitted-changes"
 else
-       echo "Reusing .patchnum" 
+       status="/* clean working directory */"
 fi
+test -z "$commit_title" && commit_title='Commit id:'
+
+new_header=`cat <<EOFTEXT
+/***************************************************************************
+* WARNING: $header_file is automatically generated by make_patchnum.sh 
+*          DO NOT EDIT DIRECTLY - edit make_patchnum.sh instead      
+****************************************************************************/
+#define PERL_PATCHNUM $describe
+$status
+#define PERL_GIT_UNPUSHED_COMMITS       $unpushed_commits
+/*leave-this-comment*/
+EOFTEXT
+`
+new_config=`cat <<EOFDATA
+#######################################################################
+# WARNING: $config_file is generated by make_patchnum.sh   
+#          DO NOT EDIT DIRECTLY - edit make_patchnum.sh instead 
+#######################################################################
+\\$Config::Git_Data=<<'ENDOFGIT';
+git_commit_id='$commit_id'
+git_describe='$describe'
+git_branch='$branch'
+git_uncommitted_changes='$changed'
+git_commit_id_title='$commit_title'
+$extra_info
+ENDOFGIT
+EOFDATA
+`
+# only update the files if necessary, other build product depends on these files
+if [ "$new_config" != "$existing_config" ] || [ "$existing_header" != "$new_header" ]; then
+       echo "Updating $header_file and $config_file"
+       echo "$new_config" > $config_file
+       echo "$new_header" > $header_file
+else
+       echo "Reusing $header_file and $config_file"
+fi
+