config-set: check write-in-full returns in set_multivar

[thirdparty/git.git] / builtin-pack-refs.c

diff --git a/builtin-pack-refs.c b/builtin-pack-refs.c
index 98710893b04c1747635776eb4f126cc18c860e35..6de7128b9d8e98dcb9850d9dc932ca522c97473a 100644 (file)
--- a/builtin-pack-refs.c
+++ b/builtin-pack-refs.c
@@ -1,44 +1,132 @@
 #include "cache.h"
 #include "refs.h"
+#include "object.h"
+#include "tag.h"
 
-static const char *result_path, *lock_path;
+static const char builtin_pack_refs_usage[] =
+"git-pack-refs [--all] [--prune | --no-prune]";
 
-static void remove_lock_file(void)
+struct ref_to_prune {
+       struct ref_to_prune *next;
+       unsigned char sha1[20];
+       char name[FLEX_ARRAY];
+};
+
+struct pack_refs_cb_data {
+       int prune;
+       int all;
+       struct ref_to_prune *ref_to_prune;
+       FILE *refs_file;
+};
+
+static int do_not_prune(int flags)
 {
-       if (lock_path)
-               unlink(lock_path);
+       /* If it is already packed or if it is a symref,
+        * do not prune it.
+        */
+       return (flags & (REF_ISSYMREF|REF_ISPACKED));
 }
 
 static int handle_one_ref(const char *path, const unsigned char *sha1,
                          int flags, void *cb_data)
 {
-       FILE *refs_file = cb_data;
+       struct pack_refs_cb_data *cb = cb_data;
+       int is_tag_ref;
+
+       /* Do not pack the symbolic refs */
+       if ((flags & REF_ISSYMREF))
+               return 0;
+       is_tag_ref = !strncmp(path, "refs/tags/", 10);
+       if (!cb->all && !is_tag_ref)
+               return 0;
 
-       fprintf(refs_file, "%s %s\n", sha1_to_hex(sha1), path);
+       fprintf(cb->refs_file, "%s %s\n", sha1_to_hex(sha1), path);
+       if (is_tag_ref) {
+               struct object *o = parse_object(sha1);
+               if (o->type == OBJ_TAG) {
+                       o = deref_tag(o, path, 0);
+                       if (o)
+                               fprintf(cb->refs_file, "^%s\n",
+                                       sha1_to_hex(o->sha1));
+               }
+       }
+
+       if (cb->prune && !do_not_prune(flags)) {
+               int namelen = strlen(path) + 1;
+               struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen);
+               hashcpy(n->sha1, sha1);
+               strcpy(n->name, path);
+               n->next = cb->ref_to_prune;
+               cb->ref_to_prune = n;
+       }
        return 0;
 }
 
+/* make sure nobody touched the ref, and unlink */
+static void prune_ref(struct ref_to_prune *r)
+{
+       struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1);
+
+       if (lock) {
+               unlink(git_path("%s", r->name));
+               unlock_ref(lock);
+       }
+}
+
+static void prune_refs(struct ref_to_prune *r)
+{
+       while (r) {
+               prune_ref(r);
+               r = r->next;
+       }
+}
+
+static struct lock_file packed;
+
 int cmd_pack_refs(int argc, const char **argv, const char *prefix)
 {
-       int fd;
-       FILE *refs_file;
+       int fd, i;
+       struct pack_refs_cb_data cbdata;
+
+       memset(&cbdata, 0, sizeof(cbdata));
+
+       cbdata.prune = 1;
+       for (i = 1; i < argc; i++) {
+               const char *arg = argv[i];
+               if (!strcmp(arg, "--prune")) {
+                       cbdata.prune = 1; /* now the default */
+                       continue;
+               }
+               if (!strcmp(arg, "--no-prune")) {
+                       cbdata.prune = 0;
+                       continue;
+               }
+               if (!strcmp(arg, "--all")) {
+                       cbdata.all = 1;
+                       continue;
+               }
+               /* perhaps other parameters later... */
+               break;
+       }
+       if (i != argc)
+               usage(builtin_pack_refs_usage);
 
-       result_path = xstrdup(git_path("packed-refs"));
-       lock_path = xstrdup(mkpath("%s.lock", result_path));
+       fd = hold_lock_file_for_update(&packed, git_path("packed-refs"), 1);
+       cbdata.refs_file = fdopen(fd, "w");
+       if (!cbdata.refs_file)
+               die("unable to create ref-pack file structure (%s)",
+                   strerror(errno));
 
-       fd = open(lock_path, O_CREAT | O_EXCL | O_WRONLY, 0666);
-       if (fd < 0)
-               die("unable to create new ref-pack file (%s)", strerror(errno));
-       atexit(remove_lock_file);
+       /* perhaps other traits later as well */
+       fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
 
-       refs_file = fdopen(fd, "w");
-       if (!refs_file)
-               die("unable to create ref-pack file structure (%s)", strerror(errno));
-       for_each_ref(handle_one_ref, refs_file);
+       for_each_ref(handle_one_ref, &cbdata);
+       fflush(cbdata.refs_file);
        fsync(fd);
-       fclose(refs_file);
-       if (rename(lock_path, result_path) < 0)
+       fclose(cbdata.refs_file);
+       if (commit_lock_file(&packed) < 0)
                die("unable to overwrite old ref-pack file (%s)", strerror(errno));
-       lock_path = NULL;
+       if (cbdata.prune)
+               prune_refs(cbdata.ref_to_prune);
        return 0;
 }