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[RFC PATCH 2/2] Store latest push cert ref in PUSH_CERT




path: Add named reference to push cert
builtin/receive-pack: update named push cert ref

Push certificates are "detached" objects on the git objects tree.
Add a named reference so the latest push certificate can be easily
fetched, verified and stored for later use. This eases tooling
around the push certificate feature.

Signed-off-by: Shikher Verma <root@xxxxxxxxxxxxxxxx>
Helped-by: Santiago Torres-Arias <santiago@xxxxxxx>
---
 builtin/receive-pack.c | 9 +++++++++
 path.c                 | 1 +
 path.h                 | 1 +
 3 files changed, 11 insertions(+)

diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 79195005f..2fdeafe63 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -1530,6 +1530,15 @@ static void execute_commands(struct command *commands,
 
 	if (shallow_update)
 		warn_if_skipped_connectivity_check(commands, si);
+
+	for (struct command *cmd = commands; cmd; cmd = cmd->next)
+		if (cmd->error_string)
+			return;
+	struct strbuf buf = STRBUF_INIT;
+	if (push_cert.len)
+		strbuf_addstr(&buf, sha1_to_hex(push_cert_sha1));
+	strbuf_addch(&buf, '\n');
+	write_file_buf(git_path_push_cert(), buf.buf, buf.len);
 }
 
 static struct command **queue_command(struct command **tail,
diff --git a/path.c b/path.c
index b533ec938..5dca2a7bf 100644
--- a/path.c
+++ b/path.c
@@ -1366,3 +1366,4 @@ GIT_PATH_FUNC(git_path_merge_mode, "MERGE_MODE")
 GIT_PATH_FUNC(git_path_merge_head, "MERGE_HEAD")
 GIT_PATH_FUNC(git_path_fetch_head, "FETCH_HEAD")
 GIT_PATH_FUNC(git_path_shallow, "shallow")
+GIT_PATH_FUNC(git_path_push_cert, "refs/PUSH_CERT")
diff --git a/path.h b/path.h
index 9541620c7..4bdeb1f07 100644
--- a/path.h
+++ b/path.h
@@ -78,5 +78,6 @@ const char *git_path_merge_mode(void);
 const char *git_path_merge_head(void);
 const char *git_path_fetch_head(void);
 const char *git_path_shallow(void);
+const char *git_path_push_cert(void);
 
 #endif /* PATH_H */
-- 
2.14.1