+static void log_commit(FILE *fp, char *fmt, const char *state,
+ struct commit *commit)
+{
+ struct pretty_print_context pp = {0};
+ struct strbuf commit_msg = STRBUF_INIT;
+ char *label = xstrfmt(fmt, state);
+
+ format_commit_message(commit, "%s", &commit_msg, &pp);
+
+ fprintf(fp, "# %s: [%s] %s\n", label, oid_to_hex(&commit->object.oid),
+ commit_msg.buf);
+
+ strbuf_release(&commit_msg);
+ free(label);
+}
+
+static int bisect_write(const char *state, const char *rev,
+ const struct bisect_terms *terms, int nolog)
+{
+ struct strbuf tag = STRBUF_INIT;
+ struct object_id oid;
+ struct commit *commit;
+ FILE *fp = NULL;
+ int retval = 0;
+
+ if (!strcmp(state, terms->term_bad)) {
+ strbuf_addf(&tag, "refs/bisect/%s", state);
+ } else if (one_of(state, terms->term_good, "skip", NULL)) {
+ strbuf_addf(&tag, "refs/bisect/%s-%s", state, rev);
+ } else {
+ retval = error(_("Bad bisect_write argument: %s"), state);
+ goto finish;
+ }
+
+ if (get_oid(rev, &oid)) {
+ retval = error(_("couldn't get the oid of the rev '%s'"), rev);
+ goto finish;
+ }
+
+ if (update_ref(NULL, tag.buf, &oid, NULL, 0,
+ UPDATE_REFS_MSG_ON_ERR)) {
+ retval = -1;
+ goto finish;
+ }
+
+ fp = fopen(git_path_bisect_log(), "a");
+ if (!fp) {
+ retval = error_errno(_("couldn't open the file '%s'"), git_path_bisect_log());
+ goto finish;
+ }
+
+ commit = lookup_commit_reference(the_repository, &oid);
+ log_commit(fp, "%s", state, commit);
+
+ if (!nolog)
+ fprintf(fp, "git bisect %s %s\n", state, rev);
+
+finish:
+ if (fp)
+ fclose(fp);
+ strbuf_release(&tag);
+ return retval;
+}
+