Documentation: pack-refs --all vs default behaviour

diff --git a/refs.c b/refs.c
index 87efa38c7e11fa05a320fb140dfcf5cb4e55da3c..4323e9a41a6c2f4fe7f0dba4b53e083bd8576d50 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -958,7 +958,7 @@ static int log_ref_write(struct ref_lock *lock,
                                     lock->log_file, strerror(errno));
        }
 
-       committer = git_committer_info(1);
+       committer = git_committer_info(-1);
        if (msg) {
                maxlen = strlen(committer) + strlen(msg) + 2*40 + 5;
                logrec = xmalloc(maxlen);
@@ -1017,7 +1017,21 @@ int write_ref_sha1(struct ref_lock *lock,
        return 0;
 }
 
-int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1)
+static char *ref_msg(const char *line, const char *endp)
+{
+       const char *ep;
+       char *msg;
+
+       line += 82;
+       for (ep = line; ep < endp && *ep != '\n'; ep++)
+               ;
+       msg = xmalloc(ep - line + 1);
+       memcpy(msg, line, ep - line);
+       msg[ep - line] = 0;
+       return msg;
+}
+
+int read_ref_at(const char *ref, 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;
@@ -1025,6 +1039,7 @@ int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *
        struct stat st;
        unsigned long date;
        unsigned char logged_sha1[20];
+       void *log_mapped;
 
        logfile = git_path("logs/%s", ref);
        logfd = open(logfile, O_RDONLY, 0);
@@ -1033,7 +1048,8 @@ int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *
        fstat(logfd, &st);
        if (!st.st_size)
                die("Log %s is empty.", logfile);
-       logdata = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0);
+       log_mapped = xmmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0);
+       logdata = log_mapped;
        close(logfd);
 
        lastrec = NULL;
@@ -1052,13 +1068,21 @@ int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *
                        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)) {
-                                       tz = strtoul(tz_c, NULL, 10);
                                        fprintf(stderr,
                                                "warning: Log %s has gap after %s.\n",
                                                logfile, show_rfc2822_date(date, tz));
@@ -1072,13 +1096,12 @@ int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *
                                if (get_sha1_hex(rec + 41, logged_sha1))
                                        die("Log %s is corrupt.", logfile);
                                if (hashcmp(logged_sha1, sha1)) {
-                                       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);
+                       munmap(log_mapped, st.st_size);
                        return 0;
                }
                lastrec = rec;
@@ -1095,14 +1118,17 @@ int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *
        tz = strtoul(tz_c, NULL, 10);
        if (get_sha1_hex(logdata, sha1))
                die("Log %s is corrupt.", logfile);
-       munmap((void*)logdata, st.st_size);
-       if (at_time)
-               fprintf(stderr, "warning: Log %s only goes back to %s.\n",
-                       logfile, show_rfc2822_date(date, tz));
-       else
-               fprintf(stderr, "warning: Log %s only has %d entries.\n",
-                       logfile, reccnt);
-       return 0;
+       if (msg)
+               *msg = ref_msg(logdata, logend);
+       munmap(log_mapped, st.st_size);
+
+       if (cutoff_time)
+               *cutoff_time = date;
+       if (cutoff_tz)
+               *cutoff_tz = tz;
+       if (cutoff_cnt)
+               *cutoff_cnt = reccnt;
+       return 1;
 }
 
 int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)