eliminate make_patchnum.sh, and make the build process use make_patchnum.pl instead

1 files changed, 59 insertions, 51 deletions

diff --git a/make_patchnum.pl b/make_patchnum.pl
index e93015f827..95b8db6137 100644
--- a/make_patchnum.pl
+++ b/make_patchnum.pl
@@ -60,30 +60,49 @@ sub write_file {
 
 sub backtick {
     my $command = shift;
-    my $result = `$command`;
-    chomp $result;
-    return $result;
+    if (wantarray) {
+        my @result= `$command`;
+        chomp @result;
+        return @result;
+    } else {
+        my $result= `$command`;
+        $result="" if ! defined $result;
+        chomp $result;
+        return $result;
+    }
 }
 
-my $existing_patchnum = read_file('.patchnum');
-my $existing_config   = read_file('lib/Config_git.pl');
-my $existing_unpushed = read_file('unpushed.h');
+sub write_files {
+    my %content= map { /WARNING: '([^']+)'/ || die "Bad mojo!"; $1 => $_ } @_;
+    my @files= sort keys %content;
+    my $files= join " and ", map { "'$_'" } @files;
+    foreach my $file (@files) { 
+        if (read_file($file) ne $content{$file}) {
+            print "Updating $files\n";
+            write_file($_,$content{$_}) for @files;
+            return 1;
+        } 
+    }
+    print "Reusing $files\n";
+    return 0;
+}
 
 my $unpushed_commits = '/*no-op*/';
-my ($read, $branch, $snapshot_created, $commit_id, $describe);
-my ($changed, $extra_info, $commit_title, $new_patchnum);
-if (my $patch_file= read_file('.patch')) {
-    ($branch, $snapshot_created, $commit_id, $describe) = split /\s+/, $patchfile;
+my ($read, $branch, $snapshot_created, $commit_id, $describe)= ("") x 5;
+my ($changed, $extra_info, $commit_title, $new_patchnum, $status)= ("") x 5;
+if (my $patch_file= read_file(".patch")) {
+    ($branch, $snapshot_created, $commit_id, $describe) = split /\s+/, $patch_file;
     $extra_info = "git_snapshot_date='$snapshot_created'";
     $commit_title = "Snapshot of:";
 }
 elsif (-d path_to('.git')) {
     # git branch | awk 'BEGIN{ORS=""} /\*/ { print $2 }'
-    $branch = join "", map { (split /\s/, $_)[1] }
-              grep {/\*/} split /\n/, backtick('git branch');
-    my $remote;
+    ($branch) = map { /\* ([^(]\S*)/ ? $1 : () } backtick('git branch');
+    my ($remote,$merge);
     if (length $branch) {
-        $remote = backtick("git config branch.$branch.remote");
+        $merge= backtick("git config branch.$branch.merge"); 
+        $merge =~ s!^refs/heads/!!;
+        $remote= backtick("git config branch.$branch.remote");
     }
     $commit_id = backtick("git rev-parse HEAD");
     $describe = backtick("git describe");
@@ -94,44 +113,45 @@ elsif (-d path_to('.git')) {
         # git cherry $remote/$branch | awk 'BEGIN{ORS=","} /\+/ {print $2}' | sed -e 's/,$//'
         my $unpushed_commit_list =
             join ",", map { (split /\s/, $_)[1] }
-            grep {/\+/} split /\n/, backtick("git cherry $remote/$branch");
+            grep {/\+/} backtick("git cherry $remote/$merge");
         # git cherry $remote/$branch | awk 'BEGIN{ORS="\t\\\\\n"} /\+/ {print ",\"" $2 "\""}'
         $unpushed_commits =
-            join "", map { ',"'.(split /\s/, $_)[1].'"'."\t\\\n" }
-            grep {/\+/} split /\n/, backtick("git cherry $remote/$branch");
+            join "", map { ',"'.(split /\s/, $_)[1]."\"\t\\\n" }
+            grep {/\+/} backtick("git cherry $remote/$merge");
         if (length $unpushed_commits) {
             $commit_title = "Local Commit:";
-            my $ancestor = backtick("git rev-parse $remote/$branch");
+            my $ancestor = backtick("git rev-parse $remote/$merge");
             $extra_info = "$extra_info
 git_ancestor='$ancestor'
+git_remote_branch='$remote/$merge'
 git_unpushed='$unpushed_commit_list'";
         }
     }
-    if (length $changed) {
+    if ($changed) {
         $changed = 'true';
         $commit_title =  "Derived from:";
-        $new_patchnum = "$new_patchnum
-status: uncommitted-changes";
-    }
-    if (not length $commit_title) {
-        $commit_title = "Commit id:";
+        $status='"uncommitted-changes"'
+    } else {
+        $status='/*clean-working-directory*/'
     }
+    $commit_title ||= "Commit id:";
 }
 
-my $new_unpushed =<<"EOFTEXT";
-/*********************************************************************
-* WARNING: unpushed.h is automatically generated by make_patchnum.pl *
-*          DO NOT EDIT DIRECTLY - edit make_patchnum.pl instead      *
-*********************************************************************/
-#define PERL_GIT_UNPUSHED_COMMITS       $unpushed_commits
-/*leave-this-comment*/
-EOFTEXT
-
-my $new_config =<<"EOFDATA";
-#################################################################
-# WARNING: lib/Config_git.pl is generated by make_patchnum.pl   #
-#          DO NOT EDIT DIRECTLY - edit make_patchnum.pl instead #
-#################################################################
+# we extract the filename out of the warning header, so dont mess with that
+exit(write_files(<<"EOF_HEADER", <<"EOF_CONFIG"));
+/**************************************************************************
+* WARNING: 'git_version.h' is automatically generated by make_patchnum.pl
+*          DO NOT EDIT DIRECTLY - edit make_patchnum.pl instead
+***************************************************************************/
+#define PERL_GIT_UNCOMMITTED_CHANGES $status
+#define PERL_PATCHNUM "$describe"
+#define PERL_GIT_UNPUSHED_COMMITS\t\t\\
+$unpushed_commits/*leave-this-comment*/
+EOF_HEADER
+######################################################################
+# WARNING: 'lib/Config_git.pl' is generated by make_patchnum.pl
+#          DO NOT EDIT DIRECTLY - edit make_patchnum.pl instead
+######################################################################
 \$Config::Git_Data=<<'ENDOFGIT';
 git_commit_id='$commit_id'
 git_describe='$describe'
@@ -140,17 +160,5 @@ git_uncommitted_changes='$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 (( $existing_patchnum ne $new_patchnum ) || ( $existing_config ne $new_config ) || ( $existing_unpushed ne $new_unpushed )) {
-    print "Updating .patchnum and lib/Config_git.pl\n";
-    write_file('.patchnum', $new_patchnum);
-    write_file('lib/Config_git.pl', $new_config);
-    write_file('unpushed.h', $new_unpushed);
-}
-else {
-    print "Reusing .patchnum and lib/Config_git.pl\n"
-}
-
+EOF_CONFIG
 # ex: set ts=4 sts=4 et ft=perl: