git-commit-vandalism/builtin-prune.c
Junio C Hamano ca4f293fb4 builtin-prune: separate ref walking from reflog walking.
This is necessary for the next step, because the reason I am
making the connectivity walker into a library is because I want
to use it for cleaning up stale reflog entries.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-01-06 22:57:34 -08:00

297 lines
6.5 KiB
C

#include "cache.h"
#include "refs.h"
#include "tag.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "tree-walk.h"
#include "diff.h"
#include "revision.h"
#include "builtin.h"
#include "cache-tree.h"
static const char prune_usage[] = "git-prune [-n]";
static int show_only;
static int prune_object(char *path, const char *filename, const unsigned char *sha1)
{
char buf[20];
const char *type;
if (show_only) {
if (sha1_object_info(sha1, buf, NULL))
type = "unknown";
else
type = buf;
printf("%s %s\n", sha1_to_hex(sha1), type);
return 0;
}
unlink(mkpath("%s/%s", path, filename));
rmdir(path);
return 0;
}
static int prune_dir(int i, char *path)
{
DIR *dir = opendir(path);
struct dirent *de;
if (!dir)
return 0;
while ((de = readdir(dir)) != NULL) {
char name[100];
unsigned char sha1[20];
int len = strlen(de->d_name);
switch (len) {
case 2:
if (de->d_name[1] != '.')
break;
case 1:
if (de->d_name[0] != '.')
break;
continue;
case 38:
sprintf(name, "%02x", i);
memcpy(name+2, de->d_name, len+1);
if (get_sha1_hex(name, sha1) < 0)
break;
/*
* Do we know about this object?
* It must have been reachable
*/
if (lookup_object(sha1))
continue;
prune_object(path, de->d_name, sha1);
continue;
}
fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
}
closedir(dir);
return 0;
}
static void prune_object_dir(const char *path)
{
int i;
for (i = 0; i < 256; i++) {
static char dir[4096];
sprintf(dir, "%s/%02x", path, i);
prune_dir(i, dir);
}
}
static void process_blob(struct blob *blob,
struct object_array *p,
struct name_path *path,
const char *name)
{
struct object *obj = &blob->object;
if (obj->flags & SEEN)
return;
obj->flags |= SEEN;
/* Nothing to do, really .. The blob lookup was the important part */
}
static void process_tree(struct tree *tree,
struct object_array *p,
struct name_path *path,
const char *name)
{
struct object *obj = &tree->object;
struct tree_desc desc;
struct name_entry entry;
struct name_path me;
if (obj->flags & SEEN)
return;
obj->flags |= SEEN;
if (parse_tree(tree) < 0)
die("bad tree object %s", sha1_to_hex(obj->sha1));
name = xstrdup(name);
add_object(obj, p, path, name);
me.up = path;
me.elem = name;
me.elem_len = strlen(name);
desc.buf = tree->buffer;
desc.size = tree->size;
while (tree_entry(&desc, &entry)) {
if (S_ISDIR(entry.mode))
process_tree(lookup_tree(entry.sha1), p, &me, entry.path);
else
process_blob(lookup_blob(entry.sha1), p, &me, entry.path);
}
free(tree->buffer);
tree->buffer = NULL;
}
static void process_tag(struct tag *tag, struct object_array *p, const char *name)
{
struct object *obj = &tag->object;
struct name_path me;
if (obj->flags & SEEN)
return;
obj->flags |= SEEN;
me.up = NULL;
me.elem = "tag:/";
me.elem_len = 5;
if (parse_tag(tag) < 0)
die("bad tag object %s", sha1_to_hex(obj->sha1));
add_object(tag->tagged, p, NULL, name);
}
static void walk_commit_list(struct rev_info *revs)
{
int i;
struct commit *commit;
struct object_array objects = { 0, 0, NULL };
/* Walk all commits, process their trees */
while ((commit = get_revision(revs)) != NULL)
process_tree(commit->tree, &objects, NULL, "");
/* Then walk all the pending objects, recursively processing them too */
for (i = 0; i < revs->pending.nr; i++) {
struct object_array_entry *pending = revs->pending.objects + i;
struct object *obj = pending->item;
const char *name = pending->name;
if (obj->type == OBJ_TAG) {
process_tag((struct tag *) obj, &objects, name);
continue;
}
if (obj->type == OBJ_TREE) {
process_tree((struct tree *)obj, &objects, NULL, name);
continue;
}
if (obj->type == OBJ_BLOB) {
process_blob((struct blob *)obj, &objects, NULL, name);
continue;
}
die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
}
}
static int add_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1, char *datail, void *cb_data)
{
struct object *object;
struct rev_info *revs = (struct rev_info *)cb_data;
object = parse_object(osha1);
if (object)
add_pending_object(revs, object, "");
object = parse_object(nsha1);
if (object)
add_pending_object(revs, object, "");
return 0;
}
static int add_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
struct object *object = parse_object(sha1);
struct rev_info *revs = (struct rev_info *)cb_data;
if (!object)
die("bad object ref: %s:%s", path, sha1_to_hex(sha1));
add_pending_object(revs, object, "");
return 0;
}
static int add_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
for_each_reflog_ent(path, add_one_reflog_ent, cb_data);
return 0;
}
static void add_one_tree(const unsigned char *sha1, struct rev_info *revs)
{
struct tree *tree = lookup_tree(sha1);
add_pending_object(revs, &tree->object, "");
}
static void add_cache_tree(struct cache_tree *it, struct rev_info *revs)
{
int i;
if (it->entry_count >= 0)
add_one_tree(it->sha1, revs);
for (i = 0; i < it->subtree_nr; i++)
add_cache_tree(it->down[i]->cache_tree, revs);
}
static void add_cache_refs(struct rev_info *revs)
{
int i;
read_cache();
for (i = 0; i < active_nr; i++) {
lookup_blob(active_cache[i]->sha1);
/*
* We could add the blobs to the pending list, but quite
* frankly, we don't care. Once we've looked them up, and
* added them as objects, we've really done everything
* there is to do for a blob
*/
}
if (active_cache_tree)
add_cache_tree(active_cache_tree, revs);
}
int cmd_prune(int argc, const char **argv, const char *prefix)
{
int i;
struct rev_info revs;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (!strcmp(arg, "-n")) {
show_only = 1;
continue;
}
usage(prune_usage);
}
save_commit_buffer = 0;
/*
* Set up revision parsing, and mark us as being interested
* in all object types, not just commits.
*/
init_revisions(&revs, prefix);
revs.tag_objects = 1;
revs.blob_objects = 1;
revs.tree_objects = 1;
/* Add all external refs */
for_each_ref(add_one_ref, &revs);
/* Add all refs from the index file */
add_cache_refs(&revs);
/* Add all reflog info from refs */
for_each_ref(add_one_reflog, &revs);
/*
* Set up the revision walk - this will move all commits
* from the pending list to the commit walking list.
*/
prepare_revision_walk(&revs);
walk_commit_list(&revs);
prune_object_dir(get_object_directory());
sync();
prune_packed_objects(show_only);
return 0;
}