/*
* Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/stat.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <sha1.h>
#include <string.h>
#include <zlib.h>
#include "got_error.h"
#include "got_reference.h"
#include "got_repository.h"
#include "got_worktree.h"
#include "got_object.h"
#include "got_lib_path.h"
#include "got_lib_delta.h"
#include "got_lib_inflate.h"
#include "got_lib_object.h"
#include "got_lib_pack.h"
#include "got_lib_repository.h"
#include "got_lib_worktree.h"
#include "got_lib_object_idcache.h"
#ifndef nitems
#define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
#endif
#define GOT_GIT_DIR ".git"
/* Mandatory files and directories inside the git directory. */
#define GOT_OBJECTS_DIR "objects"
#define GOT_REFS_DIR "refs"
#define GOT_HEAD_FILE "HEAD"
/* Other files and directories inside the git directory. */
#define GOT_FETCH_HEAD_FILE "FETCH_HEAD"
#define GOT_ORIG_HEAD_FILE "ORIG_HEAD"
#define GOT_OBJECTS_PACK_DIR "objects/pack"
char *
got_repo_get_path(struct got_repository *repo)
{
return strdup(repo->path);
}
char *
got_repo_get_path_git_dir(struct got_repository *repo)
{
return strdup(repo->path_git_dir);
}
static char *
get_path_git_child(struct got_repository *repo, const char *basename)
{
char *path_child;
if (asprintf(&path_child, "%s/%s", repo->path_git_dir,
basename) == -1)
return NULL;
return path_child;
}
char *
got_repo_get_path_objects(struct got_repository *repo)
{
return get_path_git_child(repo, GOT_OBJECTS_DIR);
}
char *
got_repo_get_path_objects_pack(struct got_repository *repo)
{
return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
}
char *
got_repo_get_path_refs(struct got_repository *repo)
{
return get_path_git_child(repo, GOT_REFS_DIR);
}
static char *
get_path_head(struct got_repository *repo)
{
return get_path_git_child(repo, GOT_HEAD_FILE);
}
static int
is_git_repo(struct got_repository *repo)
{
char *path_git = got_repo_get_path_git_dir(repo);
char *path_objects = got_repo_get_path_objects(repo);
char *path_refs = got_repo_get_path_refs(repo);
char *path_head = get_path_head(repo);
int ret = 0;
struct stat sb;
struct got_reference *head_ref;
if (lstat(path_git, &sb) == -1)
goto done;
if (!S_ISDIR(sb.st_mode))
goto done;
if (lstat(path_objects, &sb) == -1)
goto done;
if (!S_ISDIR(sb.st_mode))
goto done;
if (lstat(path_refs, &sb) == -1)
goto done;
if (!S_ISDIR(sb.st_mode))
goto done;
if (lstat(path_head, &sb) == -1)
goto done;
if (!S_ISREG(sb.st_mode))
goto done;
/* Check if the HEAD reference can be opened. */
if (got_ref_open(&head_ref, repo, GOT_REF_HEAD) != NULL)
goto done;
got_ref_close(head_ref);
ret = 1;
done:
free(path_git);
free(path_objects);
free(path_refs);
free(path_head);
return ret;
}
static const struct got_error *
cache_add(struct got_object_cache *cache, struct got_object_id *id, void *item)
{
const struct got_error *err = NULL;
struct got_object_cache_entry *ce;
int nelem;
nelem = got_object_idcache_num_elements(cache->idcache);
if (nelem >= cache->size) {
err = got_object_idcache_remove_least_used((void **)&ce,
cache->idcache);
if (err)
return err;
switch (cache->type) {
case GOT_OBJECT_CACHE_TYPE_OBJ:
got_object_close(ce->data.obj);
break;
case GOT_OBJECT_CACHE_TYPE_TREE:
got_object_tree_close(ce->data.tree);
break;
case GOT_OBJECT_CACHE_TYPE_COMMIT:
got_object_commit_close(ce->data.commit);
break;
}
free(ce);
}
ce = calloc(1, sizeof(*ce));
if (ce == NULL)
return got_error_from_errno();
memcpy(&ce->id, id, sizeof(ce->id));
switch (cache->type) {
case GOT_OBJECT_CACHE_TYPE_OBJ:
ce->data.obj = (struct got_object *)item;
break;
case GOT_OBJECT_CACHE_TYPE_TREE:
ce->data.tree = (struct got_tree_object *)item;
break;
case GOT_OBJECT_CACHE_TYPE_COMMIT:
ce->data.commit = (struct got_commit_object *)item;
break;
}
err = got_object_idcache_add(cache->idcache, id, ce);
if (err) {
if (err->code == GOT_ERR_OBJ_EXISTS) {
free(ce);
err = NULL;
}
}
return err;
}
const struct got_error *
got_repo_cache_object(struct got_repository *repo, struct got_object_id *id,
struct got_object *obj)
{
const struct got_error *err = NULL;
err = cache_add(&repo->objcache, id, obj);
if (err)
return err;
obj->refcnt++;
return NULL;
}
struct got_object *
got_repo_get_cached_object(struct got_repository *repo,
struct got_object_id *id)
{
struct got_object_cache_entry *ce;
ce = got_object_idcache_get(repo->objcache.idcache, id);
if (ce) {
repo->objcache.cache_hit++;
return ce->data.obj;
}
repo->objcache.cache_miss++;
return NULL;
}
const struct got_error *
got_repo_cache_tree(struct got_repository *repo, struct got_object_id *id,
struct got_tree_object *tree)
{
const struct got_error *err = NULL;
err = cache_add(&repo->treecache, id, tree);
if (err)
return err;
tree->refcnt++;
return NULL;
}
struct got_tree_object *
got_repo_get_cached_tree(struct got_repository *repo,
struct got_object_id *id)
{
struct got_object_cache_entry *ce;
ce = got_object_idcache_get(repo->treecache.idcache, id);
if (ce) {
repo->treecache.cache_hit++;
return ce->data.tree;
}
repo->treecache.cache_miss++;
return NULL;
}
const struct got_error *
got_repo_cache_commit(struct got_repository *repo, struct got_object_id *id,
struct got_commit_object *commit)
{
const struct got_error *err = NULL;
err = cache_add(&repo->commitcache, id, commit);
if (err)
return err;
commit->refcnt++;
return NULL;
}
struct got_commit_object *
got_repo_get_cached_commit(struct got_repository *repo,
struct got_object_id *id)
{
struct got_object_cache_entry *ce;
ce = got_object_idcache_get(repo->commitcache.idcache, id);
if (ce) {
repo->commitcache.cache_hit++;
return ce->data.commit;
}
repo->commitcache.cache_miss++;
return NULL;
}
const struct got_error *
got_repo_open(struct got_repository **ret, const char *path)
{
struct got_repository *repo = NULL;
const struct got_error *err = NULL;
char *abspath;
if (got_path_is_absolute(path))
abspath = strdup(path);
else
abspath = got_path_get_absolute(path);
if (abspath == NULL)
return got_error(GOT_ERR_BAD_PATH);
repo = calloc(1, sizeof(*repo));
if (repo == NULL) {
err = got_error_from_errno();
goto done;
}
repo->objcache.type = GOT_OBJECT_CACHE_TYPE_OBJ;
repo->objcache.size = GOT_OBJECT_CACHE_SIZE_OBJ;
repo->objcache.idcache = got_object_idcache_alloc(repo->objcache.size);
if (repo->objcache.idcache == NULL) {
err = got_error_from_errno();
goto done;
}
repo->treecache.type = GOT_OBJECT_CACHE_TYPE_TREE;
repo->treecache.size = GOT_OBJECT_CACHE_SIZE_TREE;
repo->treecache.idcache =
got_object_idcache_alloc(repo->treecache.size);
if (repo->treecache.idcache == NULL) {
err = got_error_from_errno();
goto done;
}
repo->commitcache.type = GOT_OBJECT_CACHE_TYPE_COMMIT;
repo->commitcache.size = GOT_OBJECT_CACHE_SIZE_COMMIT;
repo->commitcache.idcache =
got_object_idcache_alloc(repo->commitcache.size);
if (repo->commitcache.idcache == NULL) {
err = got_error_from_errno();
goto done;
}
repo->path = got_path_normalize(abspath);
if (repo->path == NULL) {
err = got_error(GOT_ERR_BAD_PATH);
goto done;
}
repo->path_git_dir = strdup(repo->path);
if (repo->path_git_dir == NULL) {
err = got_error_from_errno();
goto done;
}
if (!is_git_repo(repo)) {
free(repo->path_git_dir);
if (asprintf(&repo->path_git_dir, "%s/%s", repo->path,
GOT_GIT_DIR) == -1) {
err = got_error_from_errno();
goto done;
}
if (!is_git_repo(repo)) {
struct got_worktree *worktree;
if (got_worktree_open(&worktree, repo->path) == NULL) {
free(repo->path_git_dir);
repo->path_git_dir =
strdup(worktree->repo_path);
if (repo->path_git_dir == NULL) {
err = got_error_from_errno();
goto done;
}
if (!is_git_repo(repo)) {
free(repo->path_git_dir);
if (asprintf(&repo->path_git_dir,
"%s/%s", worktree->repo_path,
GOT_GIT_DIR) == -1) {
err = got_error_from_errno();
goto done;
}
}
got_worktree_close(worktree);
}
}
if (!is_git_repo(repo)) {
err = got_error(GOT_ERR_NOT_GIT_REPO);
goto done;
}
}
*ret = repo;
done:
if (err)
got_repo_close(repo);
free(abspath);
return err;
}
#if 0
static void
print_cache_stats(struct got_object_cache *cache, const char *name)
{
fprintf(stderr, "%s cache: %d elements, %d hits, %d missed\n",
name, got_object_idcache_num_elements(cache->idcache),
cache->cache_hit, cache->cache_miss);
}
void check_refcount(struct got_object_id *id, void *data, void *arg)
{
struct got_object_cache *cache = arg;
struct got_object_cache_entry *ce = data;
struct got_object *obj;
struct got_tree_object *tree;
struct got_commit_object *commit;
char *id_str;
if (got_object_id_str(&id_str, id) != NULL)
return;
switch (cache->type) {
case GOT_OBJECT_CACHE_TYPE_OBJ:
obj = ce->data.obj;
if (obj->refcnt == 1)
break;
fprintf(stderr, "object %s has %d unclaimed references\n",
id_str, obj->refcnt - 1);
break;
case GOT_OBJECT_CACHE_TYPE_TREE:
tree = ce->data.tree;
if (tree->refcnt == 1)
break;
fprintf(stderr, "tree %s has %d unclaimed references\n",
id_str, tree->refcnt - 1);
break;
case GOT_OBJECT_CACHE_TYPE_COMMIT:
commit = ce->data.commit;
if (commit->refcnt == 1)
break;
fprintf(stderr, "commit %s has %d unclaimed references\n",
id_str, commit->refcnt);
break;
}
free(id_str);
}
#endif
void
got_repo_close(struct got_repository *repo)
{
int i;
for (i = 0; i < nitems(repo->packidx_cache); i++) {
if (repo->packidx_cache[i] == NULL)
break;
got_packidx_close(repo->packidx_cache[i]);
}
for (i = 0; i < nitems(repo->packs); i++) {
if (repo->packs[i].path_packfile == NULL)
break;
got_pack_close(&repo->packs[i]);
}
free(repo->path);
free(repo->path_git_dir);
#if 0
print_cache_stats(&repo->objcache, "object");
print_cache_stats(&repo->treecache, "tree");
print_cache_stats(&repo->commitcache, "commit");
got_object_idcache_for_each(repo->objcache.idcache, check_refcount,
&repo->objcache);
got_object_idcache_for_each(repo->treecache.idcache, check_refcount,
&repo->treecache);
got_object_idcache_for_each(repo->commitcache.idcache, check_refcount,
&repo->commitcache);
#endif
if (repo->objcache.idcache)
got_object_idcache_free(repo->objcache.idcache);
if (repo->treecache.idcache)
got_object_idcache_free(repo->treecache.idcache);
if (repo->commitcache.idcache)
got_object_idcache_free(repo->commitcache.idcache);
free(repo);
}
