+ if (strbuf_read_file(&sb, git_path("%s", path), 0) <= 0)
+ goto got_nothing;
+
+ while (&sb.len && sb.buf[sb.len - 1] == '\n')
+ strbuf_setlen(&sb, sb.len - 1);
+ if (!sb.len)
+ goto got_nothing;
+ if (starts_with(sb.buf, "refs/heads/"))
+ strbuf_remove(&sb,0, strlen("refs/heads/"));
+ else if (starts_with(sb.buf, "refs/"))
+ ;
+ else if (!get_sha1_hex(sb.buf, sha1)) {
+ const char *abbrev;
+ abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
+ strbuf_reset(&sb);
+ strbuf_addstr(&sb, abbrev);
+ } else if (!strcmp(sb.buf, "detached HEAD")) /* rebase */
+ goto got_nothing;
+ else /* bisect */
+ ;
+ return strbuf_detach(&sb, NULL);
+
+got_nothing:
+ strbuf_release(&sb);
+ return NULL;
+}
+
+struct grab_1st_switch_cbdata {
+ struct strbuf buf;
+ unsigned char nsha1[20];
+};
+
+static int grab_1st_switch(unsigned char *osha1, unsigned char *nsha1,
+ const char *email, unsigned long timestamp, int tz,
+ const char *message, void *cb_data)
+{
+ struct grab_1st_switch_cbdata *cb = cb_data;
+ const char *target = NULL, *end;
+
+ if (!starts_with(message, "checkout: moving from "))
+ return 0;
+ message += strlen("checkout: moving from ");
+ target = strstr(message, " to ");
+ if (!target)
+ return 0;
+ target += strlen(" to ");
+ strbuf_reset(&cb->buf);
+ hashcpy(cb->nsha1, nsha1);
+ for (end = target; *end && *end != '\n'; end++)
+ ;
+ strbuf_add(&cb->buf, target, end - target);
+ return 1;
+}
+
+static void wt_status_get_detached_from(struct wt_status_state *state)
+{
+ struct grab_1st_switch_cbdata cb;
+ struct commit *commit;
+ unsigned char sha1[20];
+ char *ref = NULL;
+
+ strbuf_init(&cb.buf, 0);
+ if (for_each_reflog_ent_reverse("HEAD", grab_1st_switch, &cb) <= 0) {
+ strbuf_release(&cb.buf);
+ return;
+ }
+
+ if (dwim_ref(cb.buf.buf, cb.buf.len, sha1, &ref) == 1 &&
+ /* sha1 is a commit? match without further lookup */
+ (!hashcmp(cb.nsha1, sha1) ||
+ /* perhaps sha1 is a tag, try to dereference to a commit */
+ ((commit = lookup_commit_reference_gently(sha1, 1)) != NULL &&
+ !hashcmp(cb.nsha1, commit->object.sha1)))) {
+ int ofs;
+ if (starts_with(ref, "refs/tags/"))
+ ofs = strlen("refs/tags/");
+ else if (starts_with(ref, "refs/remotes/"))
+ ofs = strlen("refs/remotes/");
+ else
+ ofs = 0;
+ state->detached_from = xstrdup(ref + ofs);
+ } else
+ state->detached_from =
+ xstrdup(find_unique_abbrev(cb.nsha1, DEFAULT_ABBREV));
+ hashcpy(state->detached_sha1, cb.nsha1);
+
+ free(ref);
+ strbuf_release(&cb.buf);
+}
+
+void wt_status_get_state(struct wt_status_state *state,
+ int get_detached_from)
+{
+ struct stat st;
+ unsigned char sha1[20];