int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt,
unsigned char *sha1, char **msg,
unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
{
struct read_ref_at_cb cb;
memset(&cb, 0, sizeof(cb));
cb.refname = refname;
cb.at_time = at_time;
cb.cnt = cnt;
cb.msg = msg;
cb.cutoff_time = cutoff_time;
cb.cutoff_tz = cutoff_tz;
cb.cutoff_cnt = cutoff_cnt;
cb.sha1 = sha1;
for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
if (!cb.reccnt) {
if (flags & GET_SHA1_QUIETLY)
exit(128);
else
die("Log for %s is empty.", refname);
}
if (cb.found_it)
return 0;
for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb);
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 (!prefixcmp(ref, "refs/tags/"))
ofs = strlen("refs/tags/");
else if (!prefixcmp(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);
}
