diff options
Diffstat (limited to 'lib/common/src')
| -rw-r--r-- | lib/common/src/dir_tree_iterator.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/lib/common/src/dir_tree_iterator.c b/lib/common/src/dir_tree_iterator.c new file mode 100644 index 0000000..f161507 --- /dev/null +++ b/lib/common/src/dir_tree_iterator.c @@ -0,0 +1,257 @@ +/* SPDX-License-Identifier: LGPL-3.0-or-later */ +/* + * dir_tree_iterator.c + * + * Copyright (C) 2023 David Oberhollenzer <goliath@infraroot.at> + */ +#include "config.h" +#include "dir_tree_iterator.h" +#include "util/util.h" +#include "sqfs/error.h" +#include "sqfs/io.h" + +#include <stdlib.h> +#include <string.h> + +typedef struct { + sqfs_dir_iterator_t base; + + dir_tree_cfg_t cfg; + int state; + sqfs_dir_iterator_t *rec; +} dir_tree_iterator_t; + +static bool should_skip(const dir_tree_iterator_t *dir, const sqfs_dir_entry_t *ent) +{ + unsigned int type_mask; + + if ((dir->cfg.flags & DIR_SCAN_ONE_FILESYSTEM)) { + if (ent->flags & SQFS_DIR_ENTRY_FLAG_MOUNT_POINT) + return true; + } + + switch (ent->mode & S_IFMT) { + case S_IFSOCK: type_mask = DIR_SCAN_NO_SOCK; break; + case S_IFLNK: type_mask = DIR_SCAN_NO_SLINK; break; + case S_IFREG: type_mask = DIR_SCAN_NO_FILE; break; + case S_IFBLK: type_mask = DIR_SCAN_NO_BLK; break; + case S_IFCHR: type_mask = DIR_SCAN_NO_CHR; break; + case S_IFIFO: type_mask = DIR_SCAN_NO_FIFO; break; + default: type_mask = 0; break; + } + + return (dir->cfg.flags & type_mask) != 0; +} + +static sqfs_dir_entry_t *expand_path(const dir_tree_iterator_t *it, sqfs_dir_entry_t *ent) +{ + if (it->cfg.prefix != NULL && it->cfg.prefix[0] != '\0') { + size_t plen = strlen(it->cfg.prefix) + 1; + size_t slen = strlen(ent->name) + 1; + void *new = realloc(ent, sizeof(*ent) + plen + slen); + + if (new == NULL) { + free(ent); + return NULL; + } + + ent = new; + memmove(ent->name + plen, ent->name, slen); + + memcpy(ent->name, it->cfg.prefix, plen - 1); + ent->name[plen - 1] = '/'; + } + + return ent; +} + +static void apply_changes(const dir_tree_iterator_t *it, sqfs_dir_entry_t *ent) +{ + if (!(it->cfg.flags & DIR_SCAN_KEEP_TIME)) + ent->mtime = it->cfg.def_mtime; + + if (!(it->cfg.flags & DIR_SCAN_KEEP_UID)) + ent->uid = it->cfg.def_uid; + + if (!(it->cfg.flags & DIR_SCAN_KEEP_GID)) + ent->gid = it->cfg.def_gid; + + if (!(it->cfg.flags & DIR_SCAN_KEEP_MODE)) { + ent->mode &= ~(07777); + ent->mode |= it->cfg.def_mode & 07777; + } +} + +/*****************************************************************************/ + +static void destroy(sqfs_object_t *obj) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)obj; + + sqfs_drop(it->rec); + free(it); +} + +static int next(sqfs_dir_iterator_t *base, sqfs_dir_entry_t **out) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + sqfs_dir_entry_t *ent; + int ret; + + if (it->state) + return it->state; +retry: + *out = NULL; + ent = NULL; + + for (;;) { + ret = it->rec->next(it->rec, &ent); + if (ret != 0) { + it->state = ret; + return ret; + } + + if (!should_skip(it, ent)) + break; + + if (S_ISDIR(ent->mode)) + it->rec->ignore_subdir(it->rec); + free(ent); + ent = NULL; + } + + ent = expand_path(it, ent); + if (ent == NULL) { + it->state = SQFS_ERROR_ALLOC; + return it->state; + } + + apply_changes(it, ent); + + if (S_ISDIR(ent->mode)) { + if (it->cfg.flags & DIR_SCAN_NO_RECURSION) + it->rec->ignore_subdir(it->rec); + + if (it->cfg.flags & DIR_SCAN_NO_DIR) { + free(ent); + goto retry; + } + } + + if (it->cfg.name_pattern != NULL) { + if (it->cfg.flags & DIR_SCAN_MATCH_FULL_PATH) { + ret = fnmatch(it->cfg.name_pattern, + ent->name, FNM_PATHNAME); + } else { + const char *name = strrchr(ent->name, '/'); + name = (name == NULL) ? ent->name : (name + 1); + + ret = fnmatch(it->cfg.name_pattern, name, 0); + } + + if (ret != 0) { + free(ent); + goto retry; + } + } + + *out = ent; + return it->state; +} + +static int read_link(sqfs_dir_iterator_t *base, char **out) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + + if (it->state) + return it->state; + + return it->rec->read_link(it->rec, out); +} + +static int open_subdir(sqfs_dir_iterator_t *base, sqfs_dir_iterator_t **out) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + + if (it->state) + return it->state; + + return it->rec->open_subdir(it->rec, out); +} + +static void ignore_subdir(sqfs_dir_iterator_t *base) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + + if (it->state == 0) + it->rec->ignore_subdir(it->rec); +} + +static int open_file_ro(sqfs_dir_iterator_t *base, sqfs_istream_t **out) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + + if (it->state) + return it->state; + + return it->rec->open_file_ro(it->rec, out); +} + +static int read_xattr(sqfs_dir_iterator_t *base, sqfs_xattr_t **out) +{ + dir_tree_iterator_t *it = (dir_tree_iterator_t *)base; + + if (it->state) + return it->state; + + return it->rec->read_xattr(it->rec, out); +} + +sqfs_dir_iterator_t *dir_tree_iterator_create(const char *path, + const dir_tree_cfg_t *cfg) +{ + dir_tree_iterator_t *it = calloc(1, sizeof(*it)); + sqfs_dir_iterator_t *dir; + int ret; + + if (it == NULL) { + perror(path); + return NULL; + } + + it->cfg = *cfg; + + ret = sqfs_dir_iterator_create_native(&dir, path, 0); + if (ret) { + perror(path); + goto fail; + } + + ret = sqfs_dir_iterator_create_recursive(&it->rec, dir); + sqfs_drop(dir); + if (ret) + goto fail_oom; + + if (!(cfg->flags & DIR_SCAN_NO_HARDLINKS)) { + ret = sqfs_hard_link_filter_create(&dir, it->rec); + sqfs_drop(it->rec); + it->rec = dir; + if (ret) + goto fail_oom; + } + + sqfs_object_init(it, destroy, NULL); + ((sqfs_dir_iterator_t *)it)->next = next; + ((sqfs_dir_iterator_t *)it)->read_link = read_link; + ((sqfs_dir_iterator_t *)it)->open_subdir = open_subdir; + ((sqfs_dir_iterator_t *)it)->ignore_subdir = ignore_subdir; + ((sqfs_dir_iterator_t *)it)->open_file_ro = open_file_ro; + ((sqfs_dir_iterator_t *)it)->read_xattr = read_xattr; + + return (sqfs_dir_iterator_t *)it; +fail_oom: + fprintf(stderr, "%s: out of memory\n", path); +fail: + free(it); + return NULL; +} |