return 0;
}
-static char *ref_msg(const char *line, const char *endp)
-{
- const char *ep;
- line += 82;
- ep = memchr(line, '\n', endp - line);
- if (!ep)
- ep = endp;
- return xmemdupz(line, ep - line);
+struct read_ref_at_cb {
+ const char *refname;
+ unsigned long at_time;
+ int cnt;
+ int reccnt;
+ unsigned char *sha1;
+ int found_it;
+
+ unsigned char osha1[20];
+ unsigned char nsha1[20];
+ int tz;
+ unsigned long date;
+ char **msg;
+ unsigned long *cutoff_time;
+ int *cutoff_tz;
+ int *cutoff_cnt;
+};
+
+static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1,
+ const char *email, unsigned long timestamp, int tz,
+ const char *message, void *cb_data)
+{
+ struct read_ref_at_cb *cb = cb_data;
+
+ cb->reccnt++;
+ cb->tz = tz;
+ cb->date = timestamp;
+
+ if (timestamp <= cb->at_time || cb->cnt == 0) {
+ if (cb->msg)
+ *cb->msg = xstrdup(message);
+ if (cb->cutoff_time)
+ *cb->cutoff_time = timestamp;
+ if (cb->cutoff_tz)
+ *cb->cutoff_tz = tz;
+ if (cb->cutoff_cnt)
+ *cb->cutoff_cnt = cb->reccnt - 1;
+ /*
+ * we have not yet updated cb->[n|o]sha1 so they still
+ * hold the values for the previous record.
+ */
+ if (!is_null_sha1(cb->osha1)) {
+ hashcpy(cb->sha1, nsha1);
+ if (hashcmp(cb->osha1, nsha1))
+ warning("Log for ref %s has gap after %s.",
+ cb->refname, show_date(cb->date, cb->tz, DATE_RFC2822));
+ }
+ else if (cb->date == cb->at_time)
+ hashcpy(cb->sha1, nsha1);
+ else if (hashcmp(nsha1, cb->sha1))
+ warning("Log for ref %s unexpectedly ended on %s.",
+ cb->refname, show_date(cb->date, cb->tz,
+ DATE_RFC2822));
+ hashcpy(cb->osha1, osha1);
+ hashcpy(cb->nsha1, nsha1);
+ cb->found_it = 1;
+ return 1;
+ }
+ hashcpy(cb->osha1, osha1);
+ hashcpy(cb->nsha1, nsha1);
+ if (cb->cnt > 0)
+ cb->cnt--;
+ return 0;
+}
+
+static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1,
+ const char *email, unsigned long timestamp,
+ int tz, const char *message, void *cb_data)
+{
+ struct read_ref_at_cb *cb = cb_data;
+
+ if (cb->msg)
+ *cb->msg = xstrdup(message);
+ if (cb->cutoff_time)
+ *cb->cutoff_time = timestamp;
+ if (cb->cutoff_tz)
+ *cb->cutoff_tz = tz;
+ if (cb->cutoff_cnt)
+ *cb->cutoff_cnt = cb->reccnt;
+ hashcpy(cb->sha1, osha1);
+ if (is_null_sha1(cb->sha1))
+ hashcpy(cb->sha1, nsha1);
+ /* We just want the first entry */
+ return 1;
}
int read_ref_at(const char *refname, unsigned long at_time, int cnt,
unsigned char *sha1, char **msg,
unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
{
- const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
- char *tz_c;
- int logfd, tz, reccnt = 0;
- struct stat st;
- unsigned long date;
- unsigned char logged_sha1[20];
- void *log_mapped;
- size_t mapsz;
+ struct read_ref_at_cb cb;
- logfile = git_path("logs/%s", refname);
- logfd = open(logfile, O_RDONLY, 0);
- if (logfd < 0)
- die_errno("Unable to read log '%s'", logfile);
- fstat(logfd, &st);
- if (!st.st_size)
- die("Log %s is empty.", logfile);
- mapsz = xsize_t(st.st_size);
- log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
- logdata = log_mapped;
- close(logfd);
+ 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)
+ die("Log for %s is empty.", refname);
+ if (cb.found_it)
+ return 0;
+
+ for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb);
- lastrec = NULL;
- rec = logend = logdata + st.st_size;
- while (logdata < rec) {
- reccnt++;
- if (logdata < rec && *(rec-1) == '\n')
- rec--;
- lastgt = NULL;
- while (logdata < rec && *(rec-1) != '\n') {
- rec--;
- if (*rec == '>')
- lastgt = rec;
- }
- if (!lastgt)
- die("Log %s is corrupt.", logfile);
- date = strtoul(lastgt + 1, &tz_c, 10);
- if (date <= at_time || cnt == 0) {
- tz = strtoul(tz_c, NULL, 10);
- if (msg)
- *msg = ref_msg(rec, logend);
- if (cutoff_time)
- *cutoff_time = date;
- if (cutoff_tz)
- *cutoff_tz = tz;
- if (cutoff_cnt)
- *cutoff_cnt = reccnt - 1;
- if (lastrec) {
- if (get_sha1_hex(lastrec, logged_sha1))
- die("Log %s is corrupt.", logfile);
- if (get_sha1_hex(rec + 41, sha1))
- die("Log %s is corrupt.", logfile);
- if (hashcmp(logged_sha1, sha1)) {
- warning("Log %s has gap after %s.",
- logfile, show_date(date, tz, DATE_RFC2822));
- }
- }
- else if (date == at_time) {
- if (get_sha1_hex(rec + 41, sha1))
- die("Log %s is corrupt.", logfile);
- }
- else {
- if (get_sha1_hex(rec + 41, logged_sha1))
- die("Log %s is corrupt.", logfile);
- if (hashcmp(logged_sha1, sha1)) {
- warning("Log %s unexpectedly ended on %s.",
- logfile, show_date(date, tz, DATE_RFC2822));
- }
- }
- munmap(log_mapped, mapsz);
- return 0;
- }
- lastrec = rec;
- if (cnt > 0)
- cnt--;
- }
-
- rec = logdata;
- while (rec < logend && *rec != '>' && *rec != '\n')
- rec++;
- if (rec == logend || *rec == '\n')
- die("Log %s is corrupt.", logfile);
- date = strtoul(rec + 1, &tz_c, 10);
- tz = strtoul(tz_c, NULL, 10);
- if (get_sha1_hex(logdata, sha1))
- die("Log %s is corrupt.", logfile);
- if (is_null_sha1(sha1)) {
- if (get_sha1_hex(logdata + 41, sha1))
- die("Log %s is corrupt.", logfile);
- }
- if (msg)
- *msg = ref_msg(logdata, logend);
- munmap(log_mapped, mapsz);
-
- if (cutoff_time)
- *cutoff_time = date;
- if (cutoff_tz)
- *cutoff_tz = tz;
- if (cutoff_cnt)
- *cutoff_cnt = reccnt;
return 1;
}