[PATCH 2/2] object-file: return error on index-pack abnormal exit

[Justin Tobler <jltobler@gmail.com>]

When git-index-pack(1) exits abnormally after reporting the packfile
name, `odb_transaction_files_write_pack()` records an error message in
`err_msg` but still returns success. Current callers ultimately discard
the return value, so this does not cause any issues at present, but the
return value should still reflect the failure.

Update `odb_transaction_files_write_pack()` to return an error value in
this case accordingly. While at it, simplify how the child process exit
statuses are checked.

Signed-off-by: Justin Tobler <jltobler@gmail.com>
---
 object-file.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/object-file.c b/object-file.c
index a9800143bd..e04ce0bc11 100644
--- a/object-file.c
+++ b/object-file.c
@@ -1429,8 +1429,7 @@ static int odb_transaction_files_write_pack(struct odb_transaction *base,
 	struct pack_header hdr;
 	const char *hdr_err;
 	int err_fd = opts->err_fd;
-	int ret = -1;
-	int status;
+	int ret;
 
 	hdr_err = parse_pack_header(&hdr, pack_fd);
 	if (hdr_err) {
@@ -1462,12 +1461,13 @@ static int odb_transaction_files_write_pack(struct odb_transaction *base,
 		child.in = pack_fd;
 		child.err = err_fd;
 		child.git_cmd = 1;
-		status = run_command(&child);
-		if (status) {
+		if (run_command(&child)) {
 			strbuf_addstr(err_msg, "unpack-objects abnormal exit");
 			return -1;
 		}
 	} else {
+		int report_err;
+
 		strvec_pushl(&child.args, "index-pack", "--stdin", NULL);
 		push_header_arg(&child.args, &hdr);
 
@@ -1487,24 +1487,24 @@ static int odb_transaction_files_write_pack(struct odb_transaction *base,
 		child.in = pack_fd;
 		child.err = err_fd;
 		child.git_cmd = 1;
-		status = start_command(&child);
-		if (status) {
+		if (start_command(&child)) {
 			strbuf_addstr(err_msg, "index-pack fork failed");
 			return -1;
 		}
 
-		ret = read_index_pack_report(repo, child.out, &pack_name, NULL);
+		report_err = read_index_pack_report(repo, child.out, &pack_name, NULL);
 
 		close(child.out);
 
-		status = finish_command(&child);
-		if (status) {
+		if (finish_command(&child)) {
 			strbuf_addstr(err_msg, "index-pack abnormal exit");
+			ret = -1;
 			goto out;
 		}
 
-		if (ret) {
+		if (report_err) {
 			strbuf_addstr(err_msg, "index-pack failed to report pack name");
+			ret = -1;
 			goto out;
 		}
 
-- 
2.56.0.173.gf57c9a7388