namelen = strlen(de->d_name);
if (namelen > 255)
continue;
+ if (namelen>5 && !strcmp(de->d_name+namelen-5,".lock"))
+ continue;
memcpy(path + baselen, de->d_name, namelen+1);
if (stat(git_path("%s", path), &st) < 0)
continue;
const unsigned char *old_sha1, int mustexist)
{
struct ref_lock *lock;
+ struct stat st;
lock = xcalloc(1, sizeof(struct ref_lock));
lock->lock_fd = -1;
plen = strlen(path) - plen;
path = resolve_ref(path, lock->old_sha1, mustexist);
if (!path) {
- error("Can't read ref %s", path);
unlock_ref(lock);
return NULL;
}
lock->ref_file = strdup(path);
lock->lock_file = strdup(mkpath("%s.lock", lock->ref_file));
+ lock->log_file = strdup(git_path("logs/%s", lock->ref_file + plen));
+ lock->force_write = lstat(lock->ref_file, &st) && errno == ENOENT;
if (safe_create_leading_directories(lock->lock_file))
die("unable to create directory for %s", lock->lock_file);
if (check_ref_format(ref))
return NULL;
return lock_ref_sha1_basic(git_path("refs/%s", ref),
- strlen(ref), old_sha1, mustexist);
+ 5 + strlen(ref), old_sha1, mustexist);
}
struct ref_lock* lock_any_ref_for_update(const char *ref,
free(lock->ref_file);
if (lock->lock_file)
free(lock->lock_file);
+ if (lock->log_file)
+ free(lock->log_file);
free(lock);
}
+static int log_ref_write(struct ref_lock *lock,
+ const unsigned char *sha1, const char *msg)
+{
+ int logfd, written, oflags = O_APPEND | O_WRONLY;
+ unsigned maxlen, len;
+ char *logrec;
+ const char *comitter;
+
+ if (log_all_ref_updates) {
+ if (safe_create_leading_directories(lock->log_file) < 0)
+ return error("unable to create directory for %s",
+ lock->log_file);
+ oflags |= O_CREAT;
+ }
+
+ logfd = open(lock->log_file, oflags, 0666);
+ if (logfd < 0) {
+ if (!log_all_ref_updates && errno == ENOENT)
+ return 0;
+ return error("Unable to append to %s: %s",
+ lock->log_file, strerror(errno));
+ }
+
+ setup_ident();
+ comitter = git_committer_info(1);
+ if (msg) {
+ maxlen = strlen(comitter) + strlen(msg) + 2*40 + 5;
+ logrec = xmalloc(maxlen);
+ len = snprintf(logrec, maxlen, "%s %s %s\t%s\n",
+ sha1_to_hex(lock->old_sha1),
+ sha1_to_hex(sha1),
+ comitter,
+ msg);
+ } else {
+ maxlen = strlen(comitter) + 2*40 + 4;
+ logrec = xmalloc(maxlen);
+ len = snprintf(logrec, maxlen, "%s %s %s\n",
+ sha1_to_hex(lock->old_sha1),
+ sha1_to_hex(sha1),
+ comitter);
+ }
+ written = len <= maxlen ? write(logfd, logrec, len) : -1;
+ free(logrec);
+ close(logfd);
+ if (written != len)
+ return error("Unable to append to %s", lock->log_file);
+ return 0;
+}
+
int write_ref_sha1(struct ref_lock *lock,
const unsigned char *sha1, const char *logmsg)
{
if (!lock)
return -1;
- if (!memcmp(lock->old_sha1, sha1, 20)) {
+ if (!lock->force_write && !memcmp(lock->old_sha1, sha1, 20)) {
unlock_ref(lock);
return 0;
}
unlock_ref(lock);
return -1;
}
+ if (log_ref_write(lock, sha1, logmsg) < 0) {
+ unlock_ref(lock);
+ return -1;
+ }
if (rename(lock->lock_file, lock->ref_file) < 0) {
error("Couldn't set %s", lock->ref_file);
unlock_ref(lock);
unlock_ref(lock);
return 0;
}
+
+int read_ref_at(const char *ref, unsigned long at_time, unsigned char *sha1)
+{
+ const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
+ char *tz_c;
+ int logfd, tz;
+ struct stat st;
+ unsigned long date;
+ unsigned char logged_sha1[20];
+
+ logfile = git_path("logs/%s", ref);
+ logfd = open(logfile, O_RDONLY, 0);
+ if (logfd < 0)
+ die("Unable to read log %s: %s", logfile, strerror(errno));
+ fstat(logfd, &st);
+ if (!st.st_size)
+ die("Log %s is empty.", logfile);
+ logdata = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0);
+ close(logfd);
+
+ lastrec = NULL;
+ rec = logend = logdata + st.st_size;
+ while (logdata < rec) {
+ 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) {
+ 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 (memcmp(logged_sha1, sha1, 20)) {
+ tz = strtoul(tz_c, NULL, 10);
+ fprintf(stderr,
+ "warning: Log %s has gap after %s.\n",
+ logfile, show_rfc2822_date(date, tz));
+ }
+ } 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 (memcmp(logged_sha1, sha1, 20)) {
+ tz = strtoul(tz_c, NULL, 10);
+ fprintf(stderr,
+ "warning: Log %s unexpectedly ended on %s.\n",
+ logfile, show_rfc2822_date(date, tz));
+ }
+ }
+ munmap((void*)logdata, st.st_size);
+ return 0;
+ }
+ lastrec = rec;
+ }
+
+ 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);
+ munmap((void*)logdata, st.st_size);
+ fprintf(stderr, "warning: Log %s only goes back to %s.\n",
+ logfile, show_rfc2822_date(date, tz));
+ return 0;
+}