diff options
Diffstat (limited to 'mkfs/dirscan.c')
| -rw-r--r-- | mkfs/dirscan.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/mkfs/dirscan.c b/mkfs/dirscan.c new file mode 100644 index 0000000..5cb955a --- /dev/null +++ b/mkfs/dirscan.c @@ -0,0 +1,228 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * fstree_from_dir.c + * + * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at> + */ +#include "mkfs.h" + +static char *get_file_path(tree_node_t *n, const char *name) +{ + char *ptr, *new; + int ret; + + if (n->parent == NULL) { + ptr = strdup(name); + if (ptr == NULL) + goto fail; + return ptr; + } + + ptr = fstree_get_path(n); + if (ptr == NULL) + goto fail; + + ret = canonicalize_name(ptr); + assert(ret == 0); + + new = realloc(ptr, strlen(ptr) + strlen(name) + 2); + if (new == NULL) + goto fail; + + ptr = new; + strcat(ptr, "/"); + strcat(ptr, name); + return ptr; +fail: + perror("getting absolute file path"); + free(ptr); + return NULL; +} + +#ifdef HAVE_SYS_XATTR_H +static int populate_xattr(fstree_t *fs, tree_node_t *node) +{ + char *key, *value = NULL, *buffer = NULL; + ssize_t buflen, vallen, keylen; + + buflen = listxattr(node->name, NULL, 0); + + if (buflen < 0) { + perror("listxattr"); + return -1; + } + + if (buflen == 0) + return 0; + + buffer = malloc(buflen); + if (buffer == NULL) { + perror("xattr name buffer"); + return -1; + } + + buflen = listxattr(node->name, buffer, buflen); + if (buflen == -1) { + perror("listxattr"); + goto fail; + } + + key = buffer; + while (buflen > 0) { + vallen = getxattr(node->name, key, NULL, 0); + if (vallen == -1) + goto fail; + + if (vallen > 0) { + value = alloc_string(vallen); + if (value == NULL) { + perror("xattr value buffer"); + goto fail; + } + + vallen = getxattr(node->name, key, value, vallen); + if (vallen == -1) { + perror("getxattr"); + goto fail; + } + + value[vallen] = 0; + if (fstree_add_xattr(fs, node, key, value)) + goto fail; + + free(value); + value = NULL; + } + + keylen = strlen(key) + 1; + buflen -= keylen; + key += keylen; + } + + free(buffer); + return 0; +fail: + free(value); + free(buffer); + return -1; +} +#endif + +static int populate_dir(fstree_t *fs, tree_node_t *root, dev_t devstart, + unsigned int flags) +{ + char *extra = NULL; + struct dirent *ent; + struct stat sb; + tree_node_t *n; + DIR *dir; + + dir = opendir("."); + if (dir == NULL) { + perror("opendir"); + return -1; + } + + for (;;) { + errno = 0; + ent = readdir(dir); + + if (ent == NULL) { + if (errno) { + perror("readdir"); + goto fail; + } + break; + } + + if (!strcmp(ent->d_name, "..") || !strcmp(ent->d_name, ".")) + continue; + + if (fstatat(AT_FDCWD, ent->d_name, &sb, AT_SYMLINK_NOFOLLOW)) { + perror(ent->d_name); + goto fail; + } + + if ((flags & DIR_SCAN_ONE_FILESYSTEM) && sb.st_dev != devstart) + continue; + + if (S_ISLNK(sb.st_mode)) { + extra = alloc_string(sb.st_size); + if (extra == NULL) + goto fail_rdlink; + + if (readlink(ent->d_name, extra, sb.st_size) < 0) + goto fail_rdlink; + + extra[sb.st_size] = '\0'; + } else if (S_ISREG(sb.st_mode)) { + extra = get_file_path(root, ent->d_name); + if (extra == NULL) + goto fail; + } + + if (!(flags & DIR_SCAN_KEEP_TIME)) + sb.st_mtim = fs->defaults.st_mtim; + + n = fstree_mknode(root, ent->d_name, strlen(ent->d_name), + extra, &sb); + if (n == NULL) { + perror("creating tree node"); + goto fail; + } + +#ifdef HAVE_SYS_XATTR_H + if (flags & DIR_SCAN_READ_XATTR) { + if (populate_xattr(fs, n)) + goto fail; + } +#endif + + free(extra); + extra = NULL; + } + + closedir(dir); + + for (n = root->data.dir.children; n != NULL; n = n->next) { + if (S_ISDIR(n->mode)) { + if (pushd(n->name)) + return -1; + + if (populate_dir(fs, n, devstart, flags)) + return -1; + + if (popd()) + return -1; + } + } + + return 0; +fail_rdlink: + perror("readlink"); +fail: + closedir(dir); + free(extra); + return -1; +} + +int fstree_from_dir(fstree_t *fs, const char *path, unsigned int flags) +{ + struct stat sb; + int ret; + + if (stat(path, &sb)) { + perror(path); + return -1; + } + + if (pushd(path)) + return -1; + + ret = populate_dir(fs, fs->root, sb.st_dev, flags); + + if (popd()) + ret = -1; + + return ret; +} |