commit: do not lose SQUASH_MSG contents

When concluding a conflicted "git merge --squash", the command
failed to read SQUASH_MSG that was prepared by "git merge", and
showed only the "# Conflicts:" list of conflicted paths.

Place the contents from SQUASH_MSG at the beginning, just like we
show the commit log skeleton first when concluding a normal merge,
and then show the "# Conflicts:" list, to help the user write the
log message for the resulting commit.

Test by Junio C Hamano <gitster@pobox.com>.

Signed-off-by: Sven Strickroth <sven@cs-ware.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/commit.c b/builtin/commit.c
index 4cbd5ff..6163972 100644 (file)
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -726,9 +726,18 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
                                      &sb, &ctx);
                hook_arg1 = "message";
        } else if (!stat(git_path_merge_msg(), &statbuf)) {
+               /*
+                * prepend SQUASH_MSG here if it exists and a
+                * "merge --squash" was originally performed
+                */
+               if (!stat(git_path_squash_msg(), &statbuf)) {
+                       if (strbuf_read_file(&sb, git_path_squash_msg(), 0) < 0)
+                               die_errno(_("could not read SQUASH_MSG"));
+                       hook_arg1 = "squash";
+               } else
+                       hook_arg1 = "merge";
                if (strbuf_read_file(&sb, git_path_merge_msg(), 0) < 0)
                        die_errno(_("could not read MERGE_MSG"));
-               hook_arg1 = "merge";
        } else if (!stat(git_path_squash_msg(), &statbuf)) {
                if (strbuf_read_file(&sb, git_path_squash_msg(), 0) < 0)
                        die_errno(_("could not read SQUASH_MSG"));

diff --git a/t/t7600-merge.sh b/t/t7600-merge.sh
index 75c50ee..55b9da4 100755 (executable)
--- a/t/t7600-merge.sh
+++ b/t/t7600-merge.sh
@@ -33,9 +33,11 @@ printf '%s\n' 1 2 3 4 5 6 7 8 9 >file
 printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >file.1
 printf '%s\n' 1 2 3 4 '5 X' 6 7 8 9 >file.5
 printf '%s\n' 1 2 3 4 5 6 7 8 '9 X' >file.9
+printf '%s\n' 1 2 3 4 5 6 7 8 '9 Y' >file.9y
 printf '%s\n' '1 X' 2 3 4 5 6 7 8 9 >result.1
 printf '%s\n' '1 X' 2 3 4 '5 X' 6 7 8 9 >result.1-5
 printf '%s\n' '1 X' 2 3 4 '5 X' 6 7 8 '9 X' >result.1-5-9
+printf '%s\n' 1 2 3 4 5 6 7 8 '9 Z' >result.9z
 >empty
 
 create_merge_msgs () {
@@ -128,6 +130,12 @@ test_expect_success 'setup' '
        git tag c2 &&
        c2=$(git rev-parse HEAD) &&
        git reset --hard "$c0" &&
+       cp file.9y file &&
+       git add file &&
+       test_tick &&
+       git commit -m "commit 7" &&
+       git tag c7 &&
+       git reset --hard "$c0" &&
        cp file.9 file &&
        git add file &&
        test_tick &&
@@ -218,6 +226,26 @@ test_expect_success 'merge c1 with c2' '
        verify_parents $c1 $c2
 '
 
+test_expect_success 'merge --squash c3 with c7' '
+       git reset --hard c3 &&
+       test_must_fail git merge --squash c7 &&
+       cat result.9z >file &&
+       git commit --no-edit -a &&
+
+       {
+               cat <<-EOF
+               Squashed commit of the following:
+
+               $(git show -s c7)
+
+               # Conflicts:
+               #       file
+               EOF
+       } >expect &&
+       git cat-file commit HEAD | sed -e '1,/^$/d' >actual &&
+       test_cmp expect actual
+'
+
 test_debug 'git log --graph --decorate --oneline --all'
 
 test_expect_success 'merge c1 with c2 and c3' '