alpm: don't download files from local servers

This causes file:// servers to be treated as if they were cache dirs
when checking if a package needs to be downloaded/read.

lib/libalpm/package.c

@@ -57,7 +57,7 @@ int SYMEXPORT alpm_pkg_checkmd5sum(alpm_pkg_t *pkg)
 	ASSERT(pkg->origin == ALPM_PKG_FROM_SYNCDB,
 			RET_ERR(pkg->handle, ALPM_ERR_WRONG_ARGS, -1));
 
-	fpath = _alpm_filecache_find(pkg->handle, pkg->filename);
+	fpath = _alpm_cache_find_pkg(pkg, 0);
 
 	retval = _alpm_test_checksum(fpath, pkg->md5sum, ALPM_PKG_VALIDATION_MD5SUM);
 
@@ -283,7 +283,7 @@ int SYMEXPORT alpm_pkg_get_sig(alpm_pkg_t *pkg, unsigned char **sig, size_t *sig
 		alpm_errno_t err;
 		int ret = -1;
 
-		pkgpath = _alpm_filecache_find(pkg->handle, pkg->filename);
+		pkgpath = _alpm_cache_find_pkg(pkg, 0);
 		if(!pkgpath) {
 			GOTO_ERR(pkg->handle, ALPM_ERR_PKG_NOT_FOUND, cleanup);
 		}

lib/libalpm/sync.c

@@ -323,7 +323,7 @@ static int compute_download_size(alpm_pkg_t *newpkg)
 
 	ASSERT(newpkg->filename != NULL, RET_ERR(handle, ALPM_ERR_PKG_INVALID_NAME, -1));
 	fname = newpkg->filename;
-	fpath = _alpm_filecache_find(handle, fname);
+	fpath = _alpm_cache_find_pkg(newpkg, 0);
 
 	/* downloaded file exists, so there's nothing to grab */
 	if(fpath) {
@@ -333,7 +333,7 @@ static int compute_download_size(alpm_pkg_t *newpkg)
 
 	CALLOC(fnamepart, strlen(fname) + 6, sizeof(char), return -1);
 	sprintf(fnamepart, "%s.part", fname);
-	fpath = _alpm_filecache_find(handle, fnamepart);
+	fpath = _alpm_cache_find_pkg(newpkg, 1);
 	if(fpath) {
 		struct stat st;
 		if(stat(fpath, &st) == 0) {
@@ -737,21 +737,13 @@ static int find_dl_candidates(alpm_handle_t *handle, alpm_list_t **files)
 
 			ASSERT(spkg->filename != NULL, RET_ERR(handle, ALPM_ERR_PKG_INVALID_NAME, -1));
 
-			need_download = spkg->download_size != 0 || !_alpm_filecache_exists(handle, spkg->filename);
+			need_download = spkg->download_size != 0 || !_alpm_cache_pkg_exists(spkg, 0);
 			/* even if the package file in the cache we need to check for
 			 * accompanion *.sig file as well.
 			 * If *.sig is not cached then force download the package + its signature file.
 			 */
 			if(!need_download && (siglevel & ALPM_SIG_PACKAGE)) {
-				char *sig_filename = NULL;
-				int len = strlen(spkg->filename) + 5;
-
-				MALLOC(sig_filename, len, RET_ERR(handle, ALPM_ERR_MEMORY, -1));
-				snprintf(sig_filename, len, "%s.sig", spkg->filename);
-
-				need_download = !_alpm_filecache_exists(handle, sig_filename);
-
-				FREE(sig_filename);
+				need_download = !_alpm_cache_pkg_exists(spkg, 1);
 			}
 
 			if(need_download) {
@@ -990,7 +982,7 @@ static int check_validity(alpm_handle_t *handle,
 		}
 
 		current_bytes += v.pkg->size;
-		v.path = _alpm_filecache_find(handle, v.pkg->filename);
+		v.path = _alpm_cache_find_pkg(v.pkg, 0);
 		v.siglevel = alpm_db_get_siglevel(alpm_pkg_get_db(v.pkg));
 
 		if(_alpm_pkg_validate_internal(handle, v.path, v.pkg,
@@ -1080,7 +1072,8 @@ static int load_packages(alpm_handle_t *handle, alpm_list_t **data,
 		}
 
 		current_bytes += spkg->size;
-		filepath = _alpm_filecache_find(handle, spkg->filename);
+
+		filepath = _alpm_cache_find_pkg(spkg, 0);
 
 		/* load the package file and replace pkgcache entry with it in the target list */
 		/* TODO: alpm_pkg_get_db() will not work on this target anymore */

lib/libalpm/util.c

@@ -815,6 +815,37 @@ int _alpm_str_cmp(const void *s1, const void *s2)
 	return strcmp(s1, s2);
 }
 
+char *_alpm_cache_find_pkg(alpm_pkg_t *pkg, int sig) {
+	alpm_handle_t *handle = pkg->handle;
+	struct stat buf;
+	alpm_list_t *servers = pkg->origin_data.db->servers;
+	char *retpath;
+	char filepath[PATH_MAX];
+
+	for(alpm_list_t *j = servers; j; j = j->next) {
+		char *server = j->data;
+
+		if(strncmp("file://", server, strlen("file://")) == 0) {
+			int len = strlen(server) - strlen("file://") + 1 + strlen(pkg->filename) + 1;
+
+			if(sig) {
+				len += strlen(".sig");
+				snprintf(filepath, len, "%s/%s", server + strlen("file://"), pkg->filename);
+			} else {
+				snprintf(filepath, len, "%s/%s.sig", server + strlen("file://"), pkg->filename);
+			}
+
+			if(stat(filepath, &buf) == 0 && S_ISREG(buf.st_mode)) {
+				STRDUP(retpath, filepath, RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
+				_alpm_log(handle, ALPM_LOG_DEBUG, "found pkg in repo cache: %s\n", retpath);
+				return retpath;
+			}
+		}
+	}
+
+	return _alpm_filecache_find(handle, pkg->filename);
+}
+
 /** Find a filename in a registered alpm cachedir.
  * @param handle the context handle
  * @param filename name of file to find
@@ -846,10 +877,10 @@ char *_alpm_filecache_find(alpm_handle_t *handle, const char *filename)
  * @param filename name of file to find
  * @return 0 if the filename was not found, 1 otherwise
  */
-int _alpm_filecache_exists(alpm_handle_t *handle, const char *filename)
+int _alpm_cache_pkg_exists(alpm_pkg_t *pkg, int sig)
 {
 	int res;
-	char *fpath = _alpm_filecache_find(handle, filename);
+	char *fpath = _alpm_cache_find_pkg(pkg, sig);
 	res = (fpath != NULL);
 	FREE(fpath);
 	return res;

lib/libalpm/util.h

@@ -133,9 +133,10 @@ int _alpm_run_chroot(alpm_handle_t *handle, const char *cmd, char *const argv[],
 		_alpm_cb_io in_cb, void *in_ctx);
 int _alpm_ldconfig(alpm_handle_t *handle);
 int _alpm_str_cmp(const void *s1, const void *s2);
+char *_alpm_cache_find_pkg(alpm_pkg_t *pkg, int sig);
 char *_alpm_filecache_find(alpm_handle_t *handle, const char *filename);
 /* Checks whether a file exists in cache */
-int _alpm_filecache_exists(alpm_handle_t *handle, const char *filename);
+int _alpm_cache_pkg_exists(alpm_pkg_t *pkg, int sig);
 const char *_alpm_filecache_setup(alpm_handle_t *handle);
 /* Unlike many uses of alpm_pkgvalidation_t, _alpm_test_checksum expects
  * an enum value rather than a bitfield. */