Merge branch 'maint'

* maint:
  Fix "git-commit -C $tag"
  Documentation/git-stash.txt: Adjust SYNOPSIS command syntax (2)

Author: gitster

Documentation/git-stash.txt

@@ -9,7 +9,7 @@ SYNOPSIS
 --------
 [verse]
 'git-stash' (list | show [<stash>] | apply [<stash>] | clear)
-'git-stash' [save] [message...]
+'git-stash' [save [<message>]]
 
 DESCRIPTION
 -----------
@@ -36,11 +36,12 @@ is also possible).
 OPTIONS
 -------
 
-save::
+save [<message>]::
 
 	Save your local modifications to a new 'stash', and run `git-reset
 	--hard` to revert them.  This is the default action when no
-	subcommand is given.
+	subcommand is given. The <message> part is optional and gives
+	the description along with the stashed state.
 
 list::
 

builtin-commit.c

@@ -601,7 +601,7 @@ static int parse_and_validate_options(int argc, const char *argv[],
 
 		if (get_sha1(use_message, sha1))
 			die("could not lookup commit %s", use_message);
-		commit = lookup_commit(sha1);
+		commit = lookup_commit_reference(sha1);
 		if (!commit || parse_commit(commit))
 			die("could not parse commit %s", use_message);
 

t/t7501-commit.sh

@@ -327,4 +327,22 @@ test_expect_success 'amend using the message from another commit' '
 
 '
 
+test_expect_success 'amend using the message from a commit named with tag' '
+
+	git reset --hard &&
+	test_tick &&
+	git commit --allow-empty -m "old commit" &&
+	old=$(git rev-parse --verify HEAD) &&
+	git tag -a -m "tag on old" tagged-old HEAD &&
+	test_tick &&
+	git commit --allow-empty -m "new commit" &&
+	new=$(git rev-parse --verify HEAD) &&
+	test_tick &&
+	git commit --allow-empty --amend -C tagged-old &&
+	git show --pretty="format:%ad %s" "$old" >expected &&
+	git show --pretty="format:%ad %s" HEAD >actual &&
+	diff -u expected actual
+
+'
+
 test_done