#include "common.h"
#include "repository.h"
#include "attr_file.h"
#include "config.h"
#include "sysdir.h"
#include "ignore.h"
GIT_INLINE(int) attr_cache_lock(git_attr_cache *cache)
{
GIT_UNUSED(cache); /* avoid warning if threading is off */
if (git_mutex_lock(&cache->lock) < 0) {
giterr_set(GITERR_OS, "unable to get attr cache lock");
return -1;
}
return 0;
}
GIT_INLINE(void) attr_cache_unlock(git_attr_cache *cache)
{
GIT_UNUSED(cache); /* avoid warning if threading is off */
git_mutex_unlock(&cache->lock);
}
GIT_INLINE(git_attr_file_entry *) attr_cache_lookup_entry(
git_attr_cache *cache, const char *path)
{
khiter_t pos = git_strmap_lookup_index(cache->files, path);
if (git_strmap_valid_index(cache->files, pos))
return git_strmap_value_at(cache->files, pos);
else
return NULL;
}
int git_attr_cache__alloc_file_entry(
git_attr_file_entry **out,
const char *base,
const char *path,
git_pool *pool)
{
size_t baselen = 0, pathlen = strlen(path);
size_t cachesize = sizeof(git_attr_file_entry) + pathlen + 1;
git_attr_file_entry *ce;
if (base != NULL && git_path_root(path) < 0) {
baselen = strlen(base);
cachesize += baselen;
if (baselen && base[baselen - 1] != '/')
cachesize++;
}
ce = git_pool_mallocz(pool, (uint32_t)cachesize);
GITERR_CHECK_ALLOC(ce);
if (baselen) {
memcpy(ce->fullpath, base, baselen);
if (base[baselen - 1] != '/')
ce->fullpath[baselen++] = '/';
}
memcpy(&ce->fullpath[baselen], path, pathlen);
ce->path = &ce->fullpath[baselen];
*out = ce;
return 0;
}
/* call with attrcache locked */
static int attr_cache_make_entry(
git_attr_file_entry **out, git_repository *repo, const char *path)
{
int error = 0;
git_attr_cache *cache = git_repository_attr_cache(repo);
git_attr_file_entry *entry = NULL;
error = git_attr_cache__alloc_file_entry(
&entry, git_repository_workdir(repo), path, &cache->pool);
if (!error) {
git_strmap_insert(cache->files, entry->path, entry, &error);
if (error > 0)
error = 0;
}
*out = entry;
return error;
}
/* insert entry or replace existing if we raced with another thread */
static int attr_cache_upsert(git_attr_cache *cache, git_attr_file *file)
{
git_attr_file_entry *entry;
git_attr_file *old;
if (attr_cache_lock(cache) < 0)
return -1;
entry = attr_cache_lookup_entry(cache, file->entry->path);
GIT_REFCOUNT_OWN(file, entry);
GIT_REFCOUNT_INC(file);
/*
* Replace the existing value if another thread has
* created it in the meantime.
*/
old = git__swap(entry->file[file->source], file);
if (old) {
GIT_REFCOUNT_OWN(old, NULL);
git_attr_file__free(old);
}
attr_cache_unlock(cache);
return 0;
}
static int attr_cache_remove(git_attr_cache *cache, git_attr_file *file)
{
int error = 0;
git_attr_file_entry *entry;
git_attr_file *old = NULL;
if (!file)
return 0;
if ((error = attr_cache_lock(cache)) < 0)
return error;
if ((entry = attr_cache_lookup_entry(cache, file->entry->path)) != NULL)
old = git__compare_and_swap(&entry->file[file->source], file, NULL);
attr_cache_unlock(cache);
if (old) {
GIT_REFCOUNT_OWN(old, NULL);
git_attr_file__free(old);
}
return error;
}
/* Look up cache entry and file.
* - If entry is not present, create it while the cache is locked.
* - If file is present, increment refcount before returning it, so the
* cache can be unlocked and it won't go away.
*/
static int attr_cache_lookup(
git_attr_file **out_file,
git_attr_file_entry **out_entry,
git_repository *repo,
git_attr_session *attr_session,
git_attr_file_source source,
const char *base,
const char *filename)
{
int error = 0;
git_buf path = GIT_BUF_INIT;
const char *wd = git_repository_workdir(repo), *relfile;
git_attr_cache *cache = git_repository_attr_cache(repo);
git_attr_file_entry *entry = NULL;
git_attr_file *file = NULL;
/* join base and path as needed */
if (base != NULL && git_path_root(filename) < 0) {
git_buf *p = attr_session ? &attr_session->tmp : &path;
if (git_buf_joinpath(p, base, filename) < 0)
return -1;
filename = p->ptr;
}
relfile = filename;
if (wd && !git__prefixcmp(relfile, wd))
relfile += strlen(wd);
/* check cache for existing entry */
if ((error = attr_cache_lock(cache)) < 0)
goto cleanup;
entry = attr_cache_lookup_entry(cache, relfile);
if (!entry)
error = attr_cache_make_entry(&entry, repo, relfile);
else if (entry->file[source] != NULL) {
file = entry->file[source];
GIT_REFCOUNT_INC(file);
}
attr_cache_unlock(cache);
cleanup:
*out_file = file;
*out_entry = entry;
git_buf_free(&path);
return error;
}
int git_attr_cache__get(
git_attr_file **out,
git_repository *repo,
git_attr_session *attr_session,
git_attr_file_source source,
const char *base,
const char *filename,
git_attr_file_parser parser)
{
int error = 0;
git_attr_cache *cache = git_repository_attr_cache(repo);
git_attr_file_entry *entry = NULL;
git_attr_file *file = NULL, *updated = NULL;
if ((error = attr_cache_lookup(
&file, &entry, repo, attr_session, source, base, filename)) < 0)
return error;
/* load file if we don't have one or if existing one is out of date */
if (!file || (error = git_attr_file__out_of_date(repo, attr_session, file)) > 0)
error = git_attr_file__load(&updated, repo, attr_session, entry, source, parser);
/* if we loaded the file, insert into and/or update cache */
if (updated) {
if ((error = attr_cache_upsert(cache, updated)) < 0)
git_attr_file__free(updated);
else {
git_attr_file__free(file); /* offset incref from lookup */
file = updated;
}
}
/* if file could not be loaded */
if (error < 0) {
/* remove existing entry */
if (file) {
attr_cache_remove(cache, file);
git_attr_file__free(file); /* offset incref from lookup */
file = NULL;
}
/* no error if file simply doesn't exist */
if (error == GIT_ENOTFOUND) {
giterr_clear();
error = 0;
}
}
*out = file;
return error;
}
bool git_attr_cache__is_cached(
git_repository *repo,
git_attr_file_source source,
const char *filename)
{
git_attr_cache *cache = git_repository_attr_cache(repo);
git_strmap *files;
khiter_t pos;
git_attr_file_entry *entry;
if (!cache || !(files = cache->files))
return false;
pos = git_strmap_lookup_index(files, filename);
if (!git_strmap_valid_index(files, pos))
return false;
entry = git_strmap_value_at(files, pos);
return entry && (entry->file[source] != NULL);
}
static int attr_cache__lookup_path(
char **out, git_config *cfg, const char *key, const char *fallback)
{
git_buf buf = GIT_BUF_INIT;
int error;
git_config_entry *entry = NULL;
*out = NULL;
if ((error = git_config__lookup_entry(&entry, cfg, key, false)) < 0)
return error;
if (entry) {
const char *cfgval = entry->value;
/* expand leading ~/ as needed */
if (cfgval && cfgval[0] == '~' && cfgval[1] == '/') {
if (! (error = git_sysdir_expand_global_file(&buf, &cfgval[2])))
*out = git_buf_detach(&buf);
} else if (cfgval) {
*out = git__strdup(cfgval);
}
}
else if (!git_sysdir_find_xdg_file(&buf, fallback)) {
*out = git_buf_detach(&buf);
}
git_config_entry_free(entry);
git_buf_free(&buf);
return error;
}
static void attr_cache__free(git_attr_cache *cache)
{
bool unlock;
if (!cache)
return;
unlock = (attr_cache_lock(cache) == 0);
if (cache->files != NULL) {
git_attr_file_entry *entry;
git_attr_file *file;
int i;
git_strmap_foreach_value(cache->files, entry, {
for (i = 0; i < GIT_ATTR_FILE_NUM_SOURCES; ++i) {
if ((file = git__swap(entry->file[i], NULL)) != NULL) {
GIT_REFCOUNT_OWN(file, NULL);
git_attr_file__free(file);
}
}
});
git_strmap_free(cache->files);
}
if (cache->macros != NULL) {
git_attr_rule *rule;
git_strmap_foreach_value(cache->macros, rule, {
git_attr_rule__free(rule);
});
git_strmap_free(cache->macros);
}
git_pool_clear(&cache->pool);
git__free(cache->cfg_attr_file);
cache->cfg_attr_file = NULL;
git__free(cache->cfg_excl_file);
cache->cfg_excl_file = NULL;
if (unlock)
attr_cache_unlock(cache);
git_mutex_free(&cache->lock);
git__free(cache);
}
int git_attr_cache__init(git_repository *repo)
{
int ret = 0;
git_attr_cache *cache = git_repository_attr_cache(repo);
git_config *cfg = NULL;
if (cache)
return 0;
cache = git__calloc(1, sizeof(git_attr_cache));
GITERR_CHECK_ALLOC(cache);
/* set up lock */
if (git_mutex_init(&cache->lock) < 0) {
giterr_set(GITERR_OS, "unable to initialize lock for attr cache");
git__free(cache);
return -1;
}
if ((ret = git_repository_config_snapshot(&cfg, repo)) < 0)
goto cancel;
/* cache config settings for attributes and ignores */
ret = attr_cache__lookup_path(
&cache->cfg_attr_file, cfg, GIT_ATTR_CONFIG, GIT_ATTR_FILE_XDG);
if (ret < 0)
goto cancel;
ret = attr_cache__lookup_path(
&cache->cfg_excl_file, cfg, GIT_IGNORE_CONFIG, GIT_IGNORE_FILE_XDG);
if (ret < 0)
goto cancel;
/* allocate hashtable for attribute and ignore file contents,
* hashtable for attribute macros, and string pool
*/
if ((ret = git_strmap_alloc(&cache->files)) < 0 ||
(ret = git_strmap_alloc(&cache->macros)) < 0)
goto cancel;
git_pool_init(&cache->pool, 1);
cache = git__compare_and_swap(&repo->attrcache, NULL, cache);
if (cache)
goto cancel; /* raced with another thread, free this but no error */
git_config_free(cfg);
/* insert default macros */
return git_attr_add_macro(repo, "binary", "-diff -crlf -text");
cancel:
attr_cache__free(cache);
git_config_free(cfg);
return ret;
}
void git_attr_cache_flush(git_repository *repo)
{
git_attr_cache *cache;
/* this could be done less expensively, but for now, we'll just free
* the entire attrcache and let the next use reinitialize it...
*/
if (repo && (cache = git__swap(repo->attrcache, NULL)) != NULL)
attr_cache__free(cache);
}
int git_attr_cache__insert_macro(git_repository *repo, git_attr_rule *macro)
{
git_attr_cache *cache = git_repository_attr_cache(repo);
git_strmap *macros = cache->macros;
int error;
/* TODO: generate warning log if (macro->assigns.length == 0) */
if (macro->assigns.length == 0)
return 0;
if (attr_cache_lock(cache) < 0) {
giterr_set(GITERR_OS, "unable to get attr cache lock");
error = -1;
} else {
git_strmap_insert(macros, macro->match.pattern, macro, &error);
git_mutex_unlock(&cache->lock);
}
return (error < 0) ? -1 : 0;
}
git_attr_rule *git_attr_cache__lookup_macro(
git_repository *repo, const char *name)
{
git_strmap *macros = git_repository_attr_cache(repo)->macros;
khiter_t pos;
pos = git_strmap_lookup_index(macros, name);
if (!git_strmap_valid_index(macros, pos))
return NULL;
return (git_attr_rule *)git_strmap_value_at(macros, pos);
}