git-merge-base/git-show-branch --merge-base: Documentation and test

Currently, the documentation suggests that 'git merge-base -a' and 'git
show-branch --merge-base' are equivalent (in fact it claims that the
former cannot handle more than two revs).

Alas, the handling of more than two revs is very different. Document
this by tests and correct the documentation to reflect this.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-merge-base.txt

@@ -27,6 +27,10 @@ commits on the command line.  As the most common special case, specifying only
 two commits on the command line means computing the merge base between
 the given two commits.
 
+As a consequence, the 'merge base' is not necessarily contained in each of the
+commit arguments if more than two commits are specified. This is different
+from linkgit:git-show-branch[1] when used with the `--merge-base` option.
+
 OPTIONS
 -------
 -a::

Documentation/git-show-branch.txt

@@ -82,9 +82,11 @@ OPTIONS
 	Synonym to `--more=-1`
 
 --merge-base::
-	Instead of showing the commit list, just act like the
-	'git-merge-base -a' command, except that it can accept
-	more than two heads.
+	Instead of showing the commit list, determine possible
+	merge bases for the specified commits. All merge bases
+	will be contained in all specified commits. This is
+	different from how linkgit:git-merge-base[1] handles
+	the case of three or more commits.
 
 --independent::
 	Among the <reference>s given, display only the ones that

builtin-show-branch.c

@@ -665,7 +665,7 @@ int cmd_show_branch(int ac, const char **av, const char *prefix)
 		OPT_BOOLEAN(0, "sha1-name", &sha1_name,
 			    "name commits with their object names"),
 		OPT_BOOLEAN(0, "merge-base", &merge_base,
-			    "act like git merge-base -a"),
+			    "show possible merge bases"),
 		OPT_BOOLEAN(0, "independent", &independent,
 			    "show refs unreachable from any other ref"),
 		OPT_BOOLEAN(0, "topo-order", &lifo,

t/t6010-merge-base.sh

@@ -149,6 +149,12 @@ test_expect_success 'merge-base A B C' '
 	test "$MM1" = "$MB"
 '
 
+test_expect_success 'merge-base A B C using show-branch' '
+	MB=$(git show-branch --merge-base MMA MMB MMC) &&
+	MMR=$(git rev-parse --verify MMR) &&
+	test "$MMR" = "$MB"
+'
+
 test_expect_success 'criss-cross merge-base for octopus-step (setup)' '
 	git reset --hard MMR &&
 	test_tick && git commit --allow-empty -m 1 && git tag CC1 &&