notes: implement helpers needed for note copying during rewrite

diff --git a/builtin-commit.c b/builtin-commit.c
index 55676fd874466c70445e81c69cf397cd01380aaf..f476d85293a5e2a79273054dda87073815213328 100644 (file)
--- a/builtin-commit.c
+++ b/builtin-commit.c
@@ -66,6 +66,7 @@ static char *edit_message, *use_message;
 static char *author_name, *author_email, *author_date;
 static int all, edit_flag, also, interactive, only, amend, signoff;
 static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
+static int no_post_rewrite;
 static char *untracked_files_arg, *force_date;
 /*
  * The default commit message cleanup mode will remove the lines
@@ -137,6 +138,7 @@ static struct option builtin_commit_options[] = {
        OPT_BOOLEAN('z', "null", &null_termination,
                    "terminate entries with NUL"),
        OPT_BOOLEAN(0, "amend", &amend, "amend previous commit"),
+       OPT_BOOLEAN(0, "no-post-rewrite", &no_post_rewrite, "bypass post-rewrite hook"),
        { OPTION_STRING, 'u', "untracked-files", &untracked_files_arg, "mode", "show untracked files, optional modes: all, normal, no. (Default: all)", PARSE_OPT_OPTARG, NULL, (intptr_t)"all" },
        OPT_BOOLEAN(0, "allow-empty", &allow_empty, "ok to record an empty change"),
        /* end commit contents options */
@@ -1160,6 +1162,40 @@ static int git_commit_config(const char *k, const char *v, void *cb)
        return git_status_config(k, v, s);
 }
 
+static const char post_rewrite_hook[] = "hooks/post-rewrite";
+
+static int run_rewrite_hook(const unsigned char *oldsha1,
+                           const unsigned char *newsha1)
+{
+       /* oldsha1 SP newsha1 LF NUL */
+       static char buf[2*40 + 3];
+       struct child_process proc;
+       const char *argv[3];
+       int code;
+       size_t n;
+
+       if (access(git_path(post_rewrite_hook), X_OK) < 0)
+               return 0;
+
+       argv[0] = git_path(post_rewrite_hook);
+       argv[1] = "amend";
+       argv[2] = NULL;
+
+       memset(&proc, 0, sizeof(proc));
+       proc.argv = argv;
+       proc.in = -1;
+       proc.stdout_to_stderr = 1;
+
+       code = start_command(&proc);
+       if (code)
+               return code;
+       n = snprintf(buf, sizeof(buf), "%s %s\n",
+                    sha1_to_hex(oldsha1), sha1_to_hex(newsha1));
+       write_in_full(proc.in, buf, n);
+       close(proc.in);
+       return finish_command(&proc);
+}
+
 int cmd_commit(int argc, const char **argv, const char *prefix)
 {
        struct strbuf sb = STRBUF_INIT;
@@ -1303,6 +1339,9 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 
        rerere(0);
        run_hook(get_index_file(), "post-commit", NULL);
+       if (amend && !no_post_rewrite) {
+               run_rewrite_hook(head_sha1, commit_sha1);
+       }
        if (!quiet)
                print_summary(prefix, commit_sha1);