[PATCH] commit: do not lose SQUASH_MSG contents

[Sven Strickroth <sven@cs-ware.de>]

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.

Signed-off-by: Sven Strickroth <email@cs-ware.de>
---
 builtin/commit.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index d054f84..0e48e1d 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -725,14 +725,18 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 		format_commit_message(commit, "fixup! %s\n\n",
 				      &sb, &ctx);
 		hook_arg1 = "message";
-	} else if (!stat(git_path_merge_msg(), &statbuf)) {
-		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"));
-		hook_arg1 = "squash";
+	} else if (!stat(git_path_squash_msg(), &statbuf) ||
+			   !stat(git_path_merge_msg(), &statbuf)) {
+		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 (!stat(git_path_merge_msg(), &statbuf)) {
+			if (strbuf_read_file(&sb, git_path_merge_msg(), 0) < 0)
+				die_errno(_("could not read MERGE_MSG"));
+		}
 	} else if (template_file) {
 		if (strbuf_read_file(&sb, template_file, 0) < 0)
 			die_errno(_("could not read '%s'"), template_file);
-- 
2.7.0.windows.1