aboutsummaryrefslogtreecommitdiff
path: root/bin/sqfs2tar
diff options
context:
space:
mode:
Diffstat (limited to 'bin/sqfs2tar')
-rw-r--r--bin/sqfs2tar/options.c192
-rw-r--r--bin/sqfs2tar/sqfs2tar.c291
-rw-r--r--bin/sqfs2tar/sqfs2tar.h48
-rw-r--r--bin/sqfs2tar/write_tree.c211
4 files changed, 742 insertions, 0 deletions
diff --git a/bin/sqfs2tar/options.c b/bin/sqfs2tar/options.c
new file mode 100644
index 0000000..e5c8319
--- /dev/null
+++ b/bin/sqfs2tar/options.c
@@ -0,0 +1,192 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * options.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "sqfs2tar.h"
+
+static struct option long_opts[] = {
+ { "subdir", required_argument, NULL, 'd' },
+ { "keep-as-dir", no_argument, NULL, 'k' },
+ { "root-becomes", required_argument, NULL, 'r' },
+ { "no-skip", no_argument, NULL, 's' },
+ { "no-xattr", no_argument, NULL, 'X' },
+ { "no-hard-links", no_argument, NULL, 'L' },
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, 'V' },
+ { NULL, 0, NULL, 0 },
+};
+
+static const char *short_opts = "d:kr:sXLhV";
+
+static const char *usagestr =
+"Usage: sqfs2tar [OPTIONS...] <sqfsfile>\n"
+"\n"
+"Read an input squashfs archive and turn it into a tar archive, written\n"
+"to stdout.\n"
+"\n"
+"Possible options:\n"
+"\n"
+" --subdir, -d <dir> Unpack the given sub directory instead of the\n"
+" filesystem root. Can be specified more than\n"
+" once to select multiple directories. If only\n"
+" one is specified, it becomes the new root of\n"
+" node of the archive file system tree.\n"
+"\n"
+" --root-becomes, -r <dir> Turn the root inode into a directory with the\n"
+" specified name. Everything else will be stored\n"
+" inside this directory. The special value '.' is\n"
+" allowed to prefix all tar paths with './' and\n"
+" add an entry named '.' for the root inode.\n"
+" If this option isn't used, all meta data stored\n"
+" in the root inode IS LOST!\n"
+"\n"
+" --keep-as-dir, -k If --subdir is used only once, don't make the\n"
+" subdir the archive root, instead keep it as\n"
+" prefix for all unpacked files.\n"
+" Using --subdir more than once implies\n"
+" --keep-as-dir.\n"
+" --no-xattr, -X Do not copy extended attributes.\n"
+" --no-hard-links, -L Do not generate hard links. Produce duplicate\n"
+" entries instead.\n"
+"\n"
+" --no-skip, -s Abort if a file cannot be stored in a tar\n"
+" archive. By default, it is simply skipped\n"
+" and a warning is written to stderr.\n"
+"\n"
+" --help, -h Print help text and exit.\n"
+" --version, -V Print version information and exit.\n"
+"\n"
+"Examples:\n"
+"\n"
+"\tsqfs2tar rootfs.sqfs > rootfs.tar\n"
+"\tsqfs2tar rootfs.sqfs | gzip > rootfs.tar.gz\n"
+"\tsqfs2tar rootfs.sqfs | xz > rootfs.tar.xz\n"
+"\n";
+
+bool dont_skip = false;
+bool keep_as_dir = false;
+bool no_xattr = false;
+bool no_links = false;
+
+char *root_becomes = NULL;
+char **subdirs = NULL;
+size_t num_subdirs = 0;
+static size_t max_subdirs = 0;
+
+const char *filename = NULL;
+
+void process_args(int argc, char **argv)
+{
+ size_t idx, new_count;
+ int i, ret;
+ void *new;
+
+ for (;;) {
+ i = getopt_long(argc, argv, short_opts, long_opts, NULL);
+ if (i == -1)
+ break;
+
+ switch (i) {
+ case 'd':
+ if (num_subdirs == max_subdirs) {
+ new_count = max_subdirs ? max_subdirs * 2 : 16;
+ new = realloc(subdirs,
+ new_count * sizeof(subdirs[0]));
+ if (new == NULL)
+ goto fail_errno;
+
+ max_subdirs = new_count;
+ subdirs = new;
+ }
+
+ subdirs[num_subdirs] = strdup(optarg);
+ if (subdirs[num_subdirs] == NULL)
+ goto fail_errno;
+
+ if (canonicalize_name(subdirs[num_subdirs])) {
+ perror(optarg);
+ goto fail;
+ }
+
+ ++num_subdirs;
+ break;
+ case 'r':
+ free(root_becomes);
+ root_becomes = strdup(optarg);
+ if (root_becomes == NULL)
+ goto fail_errno;
+
+ if (strcmp(root_becomes, "./") == 0)
+ root_becomes[1] = '\0';
+
+ if (strcmp(root_becomes, ".") == 0)
+ break;
+
+ if (canonicalize_name(root_becomes) != 0 ||
+ strlen(root_becomes) == 0) {
+ fprintf(stderr,
+ "Invalid root directory '%s'.\n",
+ optarg);
+ goto fail_arg;
+ }
+ break;
+ case 'k':
+ keep_as_dir = true;
+ break;
+ case 's':
+ dont_skip = true;
+ break;
+ case 'X':
+ no_xattr = true;
+ break;
+ case 'L':
+ no_links = true;
+ break;
+ case 'h':
+ fputs(usagestr, stdout);
+ goto out_success;
+ case 'V':
+ print_version("sqfs2tar");
+ goto out_success;
+ default:
+ goto fail_arg;
+ }
+ }
+
+ if (optind >= argc) {
+ fputs("Missing argument: squashfs image\n", stderr);
+ goto fail_arg;
+ }
+
+ filename = argv[optind++];
+
+ if (optind < argc) {
+ fputs("Unknown extra arguments\n", stderr);
+ goto fail_arg;
+ }
+
+ if (num_subdirs > 1)
+ keep_as_dir = true;
+
+ return;
+fail_errno:
+ perror("parsing options");
+ goto fail;
+fail_arg:
+ fputs("Try `sqfs2tar --help' for more information.\n", stderr);
+ goto fail;
+fail:
+ ret = EXIT_FAILURE;
+ goto out_exit;
+out_success:
+ ret = EXIT_SUCCESS;
+ goto out_exit;
+out_exit:
+ for (idx = 0; idx < num_subdirs; ++idx)
+ free(subdirs[idx]);
+ free(root_becomes);
+ free(subdirs);
+ exit(ret);
+}
diff --git a/bin/sqfs2tar/sqfs2tar.c b/bin/sqfs2tar/sqfs2tar.c
new file mode 100644
index 0000000..305bd4b
--- /dev/null
+++ b/bin/sqfs2tar/sqfs2tar.c
@@ -0,0 +1,291 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * sqfs2tar.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "sqfs2tar.h"
+
+sqfs_xattr_reader_t *xr;
+sqfs_data_reader_t *data;
+sqfs_super_t super;
+sqfs_hard_link_t *links = NULL;
+FILE *out_file = NULL;
+
+static sqfs_file_t *file;
+
+char *assemble_tar_path(char *name, bool is_dir)
+{
+ size_t len, new_len;
+ char *temp;
+ (void)is_dir;
+
+ if (root_becomes == NULL && !is_dir)
+ return name;
+
+ new_len = strlen(name);
+ if (root_becomes != NULL)
+ new_len += strlen(root_becomes) + 1;
+ if (is_dir)
+ new_len += 1;
+
+ temp = realloc(name, new_len + 1);
+ if (temp == NULL) {
+ perror("assembling tar entry filename");
+ free(name);
+ return NULL;
+ }
+
+ name = temp;
+
+ if (root_becomes != NULL) {
+ len = strlen(root_becomes);
+
+ memmove(name + len + 1, name, strlen(name) + 1);
+ memcpy(name, root_becomes, len);
+ name[len] = '/';
+ }
+
+ if (is_dir) {
+ len = strlen(name);
+
+ if (len == 0 || name[len - 1] != '/') {
+ name[len++] = '/';
+ name[len] = '\0';
+ }
+ }
+
+ return name;
+}
+
+static int terminate_archive(void)
+{
+ char buffer[1024];
+
+ memset(buffer, '\0', sizeof(buffer));
+
+ return write_retry("adding archive terminator", out_file,
+ buffer, sizeof(buffer));
+}
+
+static sqfs_tree_node_t *tree_merge(sqfs_tree_node_t *lhs,
+ sqfs_tree_node_t *rhs)
+{
+ sqfs_tree_node_t *head = NULL, **next_ptr = &head;
+ sqfs_tree_node_t *it, *l, *r;
+ int diff;
+
+ while (lhs->children != NULL && rhs->children != NULL) {
+ diff = strcmp((const char *)lhs->children->name,
+ (const char *)rhs->children->name);
+
+ if (diff < 0) {
+ it = lhs->children;
+ lhs->children = lhs->children->next;
+ } else if (diff > 0) {
+ it = rhs->children;
+ rhs->children = rhs->children->next;
+ } else {
+ l = lhs->children;
+ lhs->children = lhs->children->next;
+
+ r = rhs->children;
+ rhs->children = rhs->children->next;
+
+ it = tree_merge(l, r);
+ }
+
+ *next_ptr = it;
+ next_ptr = &it->next;
+ }
+
+ it = (lhs->children != NULL ? lhs->children : rhs->children);
+ *next_ptr = it;
+
+ sqfs_dir_tree_destroy(rhs);
+ lhs->children = head;
+ return lhs;
+}
+
+int main(int argc, char **argv)
+{
+ sqfs_tree_node_t *root = NULL, *subtree;
+ int flags, ret, status = EXIT_FAILURE;
+ sqfs_compressor_config_t cfg;
+ sqfs_compressor_t *cmp;
+ sqfs_id_table_t *idtbl;
+ sqfs_dir_reader_t *dr;
+ sqfs_hard_link_t *lnk;
+ size_t i;
+
+ process_args(argc, argv);
+
+#ifdef _WIN32
+ _setmode(_fileno(stdout), _O_BINARY);
+ out_file = stdout;
+#else
+ out_file = freopen(NULL, "wb", stdout);
+#endif
+
+ if (out_file == NULL) {
+ perror("changing stdout to binary mode");
+ goto out_dirs;
+ }
+
+ file = sqfs_open_file(filename, SQFS_FILE_OPEN_READ_ONLY);
+ if (file == NULL) {
+ perror(filename);
+ goto out_dirs;
+ }
+
+ ret = sqfs_super_read(&super, file);
+ if (ret) {
+ sqfs_perror(filename, "reading super block", ret);
+ goto out_fd;
+ }
+
+ sqfs_compressor_config_init(&cfg, super.compression_id,
+ super.block_size,
+ SQFS_COMP_FLAG_UNCOMPRESS);
+
+ ret = sqfs_compressor_create(&cfg, &cmp);
+
+#ifdef WITH_LZO
+ if (super.compression_id == SQFS_COMP_LZO && ret != 0)
+ ret = lzo_compressor_create(&cfg, &cmp);
+#endif
+
+ if (ret != 0) {
+ sqfs_perror(filename, "creating compressor", ret);
+ goto out_fd;
+ }
+
+ idtbl = sqfs_id_table_create(0);
+
+ if (idtbl == NULL) {
+ perror("creating ID table");
+ goto out_cmp;
+ }
+
+ ret = sqfs_id_table_read(idtbl, file, &super, cmp);
+ if (ret) {
+ sqfs_perror(filename, "loading ID table", ret);
+ goto out_id;
+ }
+
+ data = sqfs_data_reader_create(file, super.block_size, cmp);
+ if (data == NULL) {
+ sqfs_perror(filename, "creating data reader",
+ SQFS_ERROR_ALLOC);
+ goto out_id;
+ }
+
+ ret = sqfs_data_reader_load_fragment_table(data, &super);
+ if (ret) {
+ sqfs_perror(filename, "loading fragment table", ret);
+ goto out_data;
+ }
+
+ dr = sqfs_dir_reader_create(&super, cmp, file);
+ if (dr == NULL) {
+ sqfs_perror(filename, "creating dir reader",
+ SQFS_ERROR_ALLOC);
+ goto out_data;
+ }
+
+ if (!no_xattr && !(super.flags & SQFS_FLAG_NO_XATTRS)) {
+ xr = sqfs_xattr_reader_create(0);
+ if (xr == NULL) {
+ sqfs_perror(filename, "creating xattr reader",
+ SQFS_ERROR_ALLOC);
+ goto out_dr;
+ }
+
+ ret = sqfs_xattr_reader_load(xr, &super, file, cmp);
+ if (ret) {
+ sqfs_perror(filename, "loading xattr table", ret);
+ goto out_xr;
+ }
+ }
+
+ if (num_subdirs == 0) {
+ ret = sqfs_dir_reader_get_full_hierarchy(dr, idtbl, NULL,
+ 0, &root);
+ if (ret) {
+ sqfs_perror(filename, "loading filesystem tree", ret);
+ goto out;
+ }
+ } else {
+ flags = 0;
+
+ if (keep_as_dir || num_subdirs > 1)
+ flags = SQFS_TREE_STORE_PARENTS;
+
+ for (i = 0; i < num_subdirs; ++i) {
+ ret = sqfs_dir_reader_get_full_hierarchy(dr, idtbl,
+ subdirs[i],
+ flags,
+ &subtree);
+ if (ret) {
+ sqfs_perror(subdirs[i], "loading filesystem "
+ "tree", ret);
+ goto out;
+ }
+
+ if (root == NULL) {
+ root = subtree;
+ } else {
+ root = tree_merge(root, subtree);
+ }
+ }
+ }
+
+ if (!no_links) {
+ if (sqfs_tree_find_hard_links(root, &links))
+ goto out_tree;
+
+ for (lnk = links; lnk != NULL; lnk = lnk->next) {
+ lnk->target = assemble_tar_path(lnk->target, false);
+ if (lnk->target == NULL)
+ goto out;
+ }
+ }
+
+ if (write_tree_dfs(root))
+ goto out;
+
+ if (terminate_archive())
+ goto out;
+
+ status = EXIT_SUCCESS;
+ fflush(out_file);
+out:
+ while (links != NULL) {
+ lnk = links;
+ links = links->next;
+ free(lnk->target);
+ free(lnk);
+ }
+out_tree:
+ if (root != NULL)
+ sqfs_dir_tree_destroy(root);
+out_xr:
+ if (xr != NULL)
+ sqfs_destroy(xr);
+out_dr:
+ sqfs_destroy(dr);
+out_data:
+ sqfs_destroy(data);
+out_id:
+ sqfs_destroy(idtbl);
+out_cmp:
+ sqfs_destroy(cmp);
+out_fd:
+ sqfs_destroy(file);
+out_dirs:
+ for (i = 0; i < num_subdirs; ++i)
+ free(subdirs[i]);
+ free(subdirs);
+ free(root_becomes);
+ return status;
+}
diff --git a/bin/sqfs2tar/sqfs2tar.h b/bin/sqfs2tar/sqfs2tar.h
new file mode 100644
index 0000000..afd267e
--- /dev/null
+++ b/bin/sqfs2tar/sqfs2tar.h
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * sqfs2tar.h
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#ifndef SQFS2TAR_H
+#define SQFS2TAR_H
+
+#include "config.h"
+#include "common.h"
+#include "tar.h"
+
+#include <getopt.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+/* options.c */
+extern bool dont_skip;
+extern bool keep_as_dir;
+extern bool no_xattr;
+extern bool no_links;
+
+extern char *root_becomes;
+extern char **subdirs;
+extern size_t num_subdirs;
+
+extern const char *filename;
+
+void process_args(int argc, char **argv);
+
+/* tar2sqfs.c */
+extern sqfs_xattr_reader_t *xr;
+extern sqfs_data_reader_t *data;
+extern sqfs_super_t super;
+extern sqfs_hard_link_t *links;
+extern FILE *out_file;
+
+char *assemble_tar_path(char *name, bool is_dir);
+
+/* write_tree.c */
+int write_tree_dfs(const sqfs_tree_node_t *n);
+
+#endif /* SQFS2TAR_H */
diff --git a/bin/sqfs2tar/write_tree.c b/bin/sqfs2tar/write_tree.c
new file mode 100644
index 0000000..545adc1
--- /dev/null
+++ b/bin/sqfs2tar/write_tree.c
@@ -0,0 +1,211 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * write_tree.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "sqfs2tar.h"
+
+static unsigned int record_counter;
+
+static int get_xattrs(const char *name, const sqfs_inode_generic_t *inode,
+ tar_xattr_t **out)
+{
+ tar_xattr_t *list = NULL, *ent;
+ sqfs_xattr_value_t *value;
+ sqfs_xattr_entry_t *key;
+ sqfs_xattr_id_t desc;
+ sqfs_u32 index;
+ size_t i;
+ int ret;
+
+ if (xr == NULL)
+ return 0;
+
+ sqfs_inode_get_xattr_index(inode, &index);
+
+ if (index == 0xFFFFFFFF)
+ return 0;
+
+ ret = sqfs_xattr_reader_get_desc(xr, index, &desc);
+ if (ret) {
+ sqfs_perror(name, "resolving xattr index", ret);
+ return -1;
+ }
+
+ ret = sqfs_xattr_reader_seek_kv(xr, &desc);
+ if (ret) {
+ sqfs_perror(name, "locating xattr key-value pairs", ret);
+ return -1;
+ }
+
+ for (i = 0; i < desc.count; ++i) {
+ ret = sqfs_xattr_reader_read_key(xr, &key);
+ if (ret) {
+ sqfs_perror(name, "reading xattr key", ret);
+ goto fail;
+ }
+
+ ret = sqfs_xattr_reader_read_value(xr, key, &value);
+ if (ret) {
+ sqfs_perror(name, "reading xattr value", ret);
+ free(key);
+ goto fail;
+ }
+
+ ent = calloc(1, sizeof(*ent) + strlen((const char *)key->key) +
+ value->size + 2);
+ if (ent == NULL) {
+ perror("creating xattr entry");
+ free(key);
+ free(value);
+ goto fail;
+ }
+
+ ent->key = ent->data;
+ strcpy(ent->key, (const char *)key->key);
+
+ ent->value = (sqfs_u8 *)ent->key + strlen(ent->key) + 1;
+ memcpy(ent->value, value->value, value->size + 1);
+
+ ent->value_len = value->size;
+ ent->next = list;
+ list = ent;
+
+ free(key);
+ free(value);
+ }
+
+ *out = list;
+ return 0;
+fail:
+ while (list != NULL) {
+ ent = list;
+ list = list->next;
+ free(ent);
+ }
+ return -1;
+}
+
+int write_tree_dfs(const sqfs_tree_node_t *n)
+{
+ tar_xattr_t *xattr = NULL, *xit;
+ sqfs_hard_link_t *lnk = NULL;
+ char *name, *target;
+ struct stat sb;
+ size_t len;
+ int ret;
+
+ inode_stat(n, &sb);
+
+ if (n->parent == NULL) {
+ if (root_becomes == NULL)
+ goto skip_hdr;
+
+ len = strlen(root_becomes);
+ name = malloc(len + 2);
+ if (name == NULL) {
+ perror("creating root directory");
+ return -1;
+ }
+
+ memcpy(name, root_becomes, len);
+ name[len] = '/';
+ name[len + 1] = '\0';
+ } else {
+ if (!is_filename_sane((const char *)n->name, false)) {
+ fprintf(stderr, "Found a file named '%s', skipping.\n",
+ n->name);
+ if (dont_skip) {
+ fputs("Not allowed to skip files, aborting!\n",
+ stderr);
+ return -1;
+ }
+ return 0;
+ }
+
+ name = sqfs_tree_node_get_path(n);
+ if (name == NULL) {
+ perror("resolving tree node path");
+ return -1;
+ }
+
+ if (canonicalize_name(name))
+ goto out_skip;
+
+ for (lnk = links; lnk != NULL; lnk = lnk->next) {
+ if (lnk->inode_number == n->inode->base.inode_number) {
+ if (strcmp(name, lnk->target) == 0)
+ lnk = NULL;
+ break;
+ }
+ }
+
+ name = assemble_tar_path(name, S_ISDIR(sb.st_mode));
+ if (name == NULL)
+ return -1;
+ }
+
+ if (lnk != NULL) {
+ ret = write_hard_link(out_file, &sb, name, lnk->target,
+ record_counter++);
+ free(name);
+ return ret;
+ }
+
+ if (!no_xattr) {
+ if (get_xattrs(name, n->inode, &xattr)) {
+ free(name);
+ return -1;
+ }
+ }
+
+ target = S_ISLNK(sb.st_mode) ? (char *)n->inode->extra : NULL;
+ ret = write_tar_header(out_file, &sb, name, target, xattr,
+ record_counter++);
+
+ while (xattr != NULL) {
+ xit = xattr;
+ xattr = xattr->next;
+ free(xit);
+ }
+
+ if (ret > 0)
+ goto out_skip;
+
+ if (ret < 0) {
+ free(name);
+ return -1;
+ }
+
+ if (S_ISREG(sb.st_mode)) {
+ if (sqfs_data_reader_dump(name, data, n->inode, out_file,
+ super.block_size, false)) {
+ free(name);
+ return -1;
+ }
+
+ if (padd_file(out_file, sb.st_size)) {
+ free(name);
+ return -1;
+ }
+ }
+
+ free(name);
+skip_hdr:
+ for (n = n->children; n != NULL; n = n->next) {
+ if (write_tree_dfs(n))
+ return -1;
+ }
+ return 0;
+out_skip:
+ if (dont_skip) {
+ fputs("Not allowed to skip files, aborting!\n", stderr);
+ ret = -1;
+ } else {
+ fprintf(stderr, "Skipping %s\n", name);
+ ret = 0;
+ }
+ free(name);
+ return ret;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 05:21:55 +0000