[PATCH v3 7/9] builtin/receive-pack: explicitly pass packfile fd

When processing the incoming packfile in git-receive-pack(1), `unpack()`
assumes it should always read it from stdin. In preparation for
`unpack()` logic being moved behind a generic ODB transaction interface,
update the function signature to take the an explicit fd provided by
callers to read the incoming packfile from instead. Call sites are
updated accordingly.

Signed-off-by: Justin Tobler <[email protected]>
---
 builtin/receive-pack.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 6df872697b..b369466783 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -2292,9 +2292,9 @@ static void read_push_options(struct packet_reader *reader,
 	}
 }
 
-static const char *parse_pack_header(struct pack_header *hdr)
+static const char *parse_pack_header(struct pack_header *hdr, int pack_fd)
 {
-	switch (read_pack_header(0, hdr)) {
+	switch (read_pack_header(pack_fd, hdr)) {
 	case PH_ERROR_EOF:
 		return "eof before pack header was fully read";
 
@@ -2340,8 +2340,8 @@ struct unpack_opts {
 	int quiet;
 };
 
-static int unpack(struct odb_transaction *transaction, struct strbuf *err_msg,
-		  const struct unpack_opts *opts)
+static int unpack(struct odb_transaction *transaction, int pack_fd,
+		  struct strbuf *err_msg, const struct unpack_opts *opts)
 {
 	struct pack_header hdr;
 	const char *hdr_err;
@@ -2349,7 +2349,7 @@ static int unpack(struct odb_transaction *transaction, struct strbuf *err_msg,
 	struct child_process child = CHILD_PROCESS_INIT;
 	int err_fd = opts->err_fd;
 
-	hdr_err = parse_pack_header(&hdr);
+	hdr_err = parse_pack_header(&hdr, pack_fd);
 	if (hdr_err) {
 		if (err_fd > 0)
 			close(err_fd);
@@ -2376,6 +2376,7 @@ static int unpack(struct odb_transaction *transaction, struct strbuf *err_msg,
 			strvec_pushf(&child.args, "--max-input-size=%"PRIuMAX,
 				     (uintmax_t)opts->max_input_size);
 		child.no_stdout = 1;
+		child.in = pack_fd;
 		child.err = err_fd;
 		child.git_cmd = 1;
 		status = run_command(&child);
@@ -2410,6 +2411,7 @@ static int unpack(struct odb_transaction *transaction, struct strbuf *err_msg,
 			strvec_pushf(&child.args, "--max-input-size=%"PRIuMAX,
 				     (uintmax_t)opts->max_input_size);
 		child.out = -1;
+		child.in = pack_fd;
 		child.err = err_fd;
 		child.git_cmd = 1;
 		status = start_command(&child);
@@ -2461,7 +2463,7 @@ static int unpack_with_sideband(struct odb_transaction *transaction,
 	int ret;
 
 	if (!use_sideband)
-		return unpack(transaction, err_msg, &opts);
+		return unpack(transaction, 0, err_msg, &opts);
 
 	use_keepalive = KEEPALIVE_AFTER_NUL;
 	memset(&muxer, 0, sizeof(muxer));
@@ -2471,7 +2473,7 @@ static int unpack_with_sideband(struct odb_transaction *transaction,
 		return 0;
 
 	opts.err_fd = muxer.in;
-	ret = unpack(transaction, err_msg, &opts);
+	ret = unpack(transaction, 0, err_msg, &opts);
 
 	finish_async(&muxer);
 	return ret;
-- 
2.55.0.424.g13c7afec21