format-patch: make --base patch-id output stable

diff --git a/builtin/am.c b/builtin/am.c
index a9ffc92eaada7fc6e47a793ab515fd55273650d0..912d9821b18acfa0a4c1e3bed8e6c9e7b43dcdf8 100644 (file)
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -3,6 +3,7 @@
  *
  * Based on git-am.sh by Junio C Hamano.
  */
+#define USE_THE_INDEX_COMPATIBILITY_MACROS
 #include "cache.h"
 #include "config.h"
 #include "builtin.h"
@@ -34,22 +35,6 @@
 #include "packfile.h"
 #include "repository.h"
 
-/**
- * Returns 1 if the file is empty or does not exist, 0 otherwise.
- */
-static int is_empty_file(const char *filename)
-{
-       struct stat st;
-
-       if (stat(filename, &st) < 0) {
-               if (errno == ENOENT)
-                       return 1;
-               die_errno(_("could not stat %s"), filename);
-       }
-
-       return !st.st_size;
-}
-
 /**
  * Returns the length of the first line of msg.
  */
@@ -468,6 +453,7 @@ static int run_post_rewrite_hook(const struct am_state *state)
 
        cp.in = xopen(am_path(state, "rewritten"), O_RDONLY);
        cp.stdout_to_stderr = 1;
+       cp.trace2_hook_name = "post-rewrite";
 
        ret = run_command(&cp);
 
@@ -500,23 +486,24 @@ static int copy_notes_for_rebase(const struct am_state *state)
 
        while (!strbuf_getline_lf(&sb, fp)) {
                struct object_id from_obj, to_obj;
+               const char *p;
 
-               if (sb.len != GIT_SHA1_HEXSZ * 2 + 1) {
+               if (sb.len != the_hash_algo->hexsz * 2 + 1) {
                        ret = error(invalid_line, sb.buf);
                        goto finish;
                }
 
-               if (get_oid_hex(sb.buf, &from_obj)) {
+               if (parse_oid_hex(sb.buf, &from_obj, &p)) {
                        ret = error(invalid_line, sb.buf);
                        goto finish;
                }
 
-               if (sb.buf[GIT_SHA1_HEXSZ] != ' ') {
+               if (*p != ' ') {
                        ret = error(invalid_line, sb.buf);
                        goto finish;
                }
 
-               if (get_oid_hex(sb.buf + GIT_SHA1_HEXSZ + 1, &to_obj)) {
+               if (get_oid_hex(p + 1, &to_obj)) {
                        ret = error(invalid_line, sb.buf);
                        goto finish;
                }
@@ -1220,7 +1207,7 @@ static int parse_mail(struct am_state *state, const char *mail)
                goto finish;
        }
 
-       if (is_empty_file(am_path(state, "patch"))) {
+       if (is_empty_or_missing_file(am_path(state, "patch"))) {
                printf_ln(_("Patch is empty."));
                die_user_resolve(state);
        }
@@ -1515,11 +1502,11 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
                 * review them with extra care to spot mismerges.
                 */
                struct rev_info rev_info;
-               const char *diff_filter_str = "--diff-filter=AM";
 
                repo_init_revisions(the_repository, &rev_info, NULL);
                rev_info.diffopt.output_format = DIFF_FORMAT_NAME_STATUS;
-               diff_opt_parse(&rev_info.diffopt, &diff_filter_str, 1, rev_info.prefix);
+               rev_info.diffopt.filter |= diff_filter_bit('A');
+               rev_info.diffopt.filter |= diff_filter_bit('M');
                add_pending_oid(&rev_info, "HEAD", &our_tree, 0);
                diff_setup_done(&rev_info.diffopt);
                run_diff_index(&rev_info, 1);
@@ -1594,6 +1581,7 @@ static void do_commit(const struct am_state *state)
        }
 
        author = fmt_ident(state->author_name, state->author_email,
+               WANT_AUTHOR_IDENT,
                        state->ignore_date ? NULL : state->author_date,
                        IDENT_STRICT);
 
@@ -1803,7 +1791,7 @@ static void am_run(struct am_state *state, int resume)
                resume = 0;
        }
 
-       if (!is_empty_file(am_path(state, "rewritten"))) {
+       if (!is_empty_or_missing_file(am_path(state, "rewritten"))) {
                assert(state->rebasing);
                copy_notes_for_rebase(state);
                run_post_rewrite_hook(state);
@@ -2000,6 +1988,15 @@ static void am_skip(struct am_state *state)
        if (clean_index(&head, &head))
                die(_("failed to clean index"));
 
+       if (state->rebasing) {
+               FILE *fp = xfopen(am_path(state, "rewritten"), "a");
+
+               assert(!is_null_oid(&state->orig_commit));
+               fprintf(fp, "%s ", oid_to_hex(&state->orig_commit));
+               fprintf(fp, "%s\n", oid_to_hex(&head));
+               fclose(fp);
+       }
+
        am_next(state);
        am_load(state);
        am_run(state, 0);
@@ -2125,6 +2122,10 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
                *opt_value = PATCH_FORMAT_HG;
        else if (!strcmp(arg, "mboxrd"))
                *opt_value = PATCH_FORMAT_MBOXRD;
+       /*
+        * Please update $__git_patchformat in git-completion.bash
+        * when you add new options
+        */
        else
                return error(_("Invalid value for --patch-format: %s"), arg);
        return 0;