Rename tools to not collide with squashfs-tools

This commit changes the names of the tools to gensquashfs and rdsquashfs
so they don't collide with the names used by the squashfs-tools package
and the two can be installed side by side.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 289 insertions, 0 deletions

diff --git a/unpack/rdsquashfs.c b/unpack/rdsquashfs.c
new file mode 100644
index 0000000..ec14e0e
--- /dev/null
+++ b/unpack/rdsquashfs.c
@@ -0,0 +1,289 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "rdsquashfs.h"
+
+enum {
+	OP_NONE = 0,
+	OP_LS,
+	OP_CAT,
+	OP_UNPACK,
+};
+
+static struct option long_opts[] = {
+	{ "list", required_argument, NULL, 'l' },
+	{ "cat", required_argument, NULL, 'c' },
+	{ "unpack-root", required_argument, NULL, 'u' },
+	{ "no-dev", no_argument, NULL, 'D' },
+	{ "no-sock", no_argument, NULL, 'S' },
+	{ "no-fifo", no_argument, NULL, 'F' },
+	{ "no-slink", no_argument, NULL, 'L' },
+	{ "no-empty-dir", no_argument, NULL, 'E' },
+	{ "chmod", no_argument, NULL, 'C' },
+	{ "chown", no_argument, NULL, 'O' },
+	{ "help", no_argument, NULL, 'h' },
+	{ "version", no_argument, NULL, 'V' },
+};
+
+static const char *short_opts = "l:c:u:DSFLCOEhV";
+
+static const char *help_string =
+"Usage: %s [OPTIONS] <squashfs-file>\n"
+"\n"
+"View or extract the contents of a squashfs image.\n"
+"\n"
+"Possible options:\n"
+"  --list, -l <path>     Produce a directory listing for a given path in the\n"
+"                        squashfs image.\n"
+"  --cat, -c <path>      If the specified path is a regular file in the,\n"
+"                        image, dump its contents to stdout.\n"
+"  --unpack-root <path>  Unpack the contents of the filesystem into the\n"
+"                        specified path.\n"
+"  --no-dev, -D          Do not unpack device special files.\n"
+"  --no-sock, -S         Do not unpack socket files.\n"
+"  --no-fifo, -F         Do not unpack named pipes.\n"
+"  --no-slink, -L        Do not unpack symbolic links.\n"
+"  --no-empty-dir, -E    Do not unpack directories that would end up empty.\n"
+"  --chmod, -C           Change permission flags of unpacked files to those\n"
+"                        store in the squashfs image.\n"
+"  --chown, -O           Change ownership of unpacked files to the UID/GID\n"
+"                        set in the squashfs iamge.\n"
+"\n"
+"  --help, -h            Print help text and exit.\n"
+"  --version, -V         Print version information and exit.\n"
+"\n";
+
+extern const char *__progname;
+
+static tree_node_t *find_node(tree_node_t *n, const char *path)
+{
+	const char *end;
+	size_t len;
+
+	while (path != NULL && *path != '\0') {
+		if (!S_ISDIR(n->mode)) {
+			errno = ENOTDIR;
+			return NULL;
+		}
+
+		end = strchrnul(path, '/');
+		len = end - path;
+
+		for (n = n->data.dir->children; n != NULL; n = n->next) {
+			if (strncmp(path, n->name, len) != 0)
+				continue;
+			if (n->name[len] != '\0')
+				continue;
+			break;
+		}
+
+		if (n == NULL) {
+			errno = ENOENT;
+			return NULL;
+		}
+
+		path = *end ? (end + 1) : end;
+	}
+
+	return n;
+}
+
+static char *get_path(char *old, const char *arg)
+{
+	char *path;
+
+	free(old);
+
+	path = strdup(arg);
+	if (path == NULL) {
+		perror("processing arguments");
+		exit(EXIT_FAILURE);
+	}
+
+	if (canonicalize_name(path)) {
+		fprintf(stderr, "Invalid path: %s\n", arg);
+		free(path);
+		exit(EXIT_FAILURE);
+	}
+
+	return path;
+}
+
+int main(int argc, char **argv)
+{
+	int i, fd, status = EXIT_FAILURE, op = OP_NONE, unpack_flags = 0;
+	const char *unpack_root = NULL;
+	frag_reader_t *frag = NULL;
+	char *cmdpath = NULL;
+	sqfs_super_t super;
+	compressor_t *cmp;
+	tree_node_t *n;
+	fstree_t fs;
+
+	for (;;) {
+		i = getopt_long(argc, argv, short_opts, long_opts, NULL);
+		if (i == -1)
+			break;
+
+		switch (i) {
+		case 'D':
+			unpack_flags |= UNPACK_NO_DEVICES;
+			break;
+		case 'S':
+			unpack_flags |= UNPACK_NO_SOCKETS;
+			break;
+		case 'F':
+			unpack_flags |= UNPACK_NO_FIFO;
+			break;
+		case 'L':
+			unpack_flags |= UNPACK_NO_SLINKS;
+			break;
+		case 'C':
+			unpack_flags |= UNPACK_CHMOD;
+			break;
+		case 'O':
+			unpack_flags |= UNPACK_CHOWN;
+			break;
+		case 'E':
+			unpack_flags |= UNPACK_NO_EMPTY;
+			break;
+		case 'c':
+			op = OP_CAT;
+			cmdpath = get_path(cmdpath, optarg);
+			break;
+		case 'l':
+			op = OP_LS;
+			cmdpath = get_path(cmdpath, optarg);
+			break;
+		case 'u':
+			op = OP_UNPACK;
+			unpack_root = optarg;
+			break;
+		case 'h':
+			printf(help_string, __progname);
+			status = EXIT_SUCCESS;
+			goto out_cmd;
+		case 'V':
+			print_version();
+			status = EXIT_SUCCESS;
+			goto out_cmd;
+		default:
+			goto fail_arg;
+		}
+	}
+
+	if (op == OP_NONE) {
+		fputs("No opteration specified\n", stderr);
+		goto fail_arg;
+	}
+
+	if (optind >= argc) {
+		fputs("Missing image argument\n", stderr);
+		goto fail_arg;
+	}
+
+	fd = open(argv[optind], O_RDONLY);
+	if (fd < 0) {
+		perror(argv[optind]);
+		goto out_cmd;
+	}
+
+	if (sqfs_super_read(&super, fd))
+		goto out_fd;
+
+	if ((super.version_major != SQFS_VERSION_MAJOR) ||
+	    (super.version_minor != SQFS_VERSION_MINOR)) {
+		fprintf(stderr,
+			"The image uses squashfs version %d.%d\n"
+			"We currently only supports version %d.%d (sorry).\n",
+			super.version_major, super.version_minor,
+			SQFS_VERSION_MAJOR, SQFS_VERSION_MINOR);
+		goto out_fd;
+	}
+
+	if (super.flags & SQFS_FLAG_COMPRESSOR_OPTIONS) {
+		fputs("Image has been built with compressor options.\n"
+		      "This is not yet supported.\n",
+		      stderr);
+		goto out_fd;
+	}
+
+	if (!compressor_exists(super.compression_id)) {
+		fputs("Image uses a compressor that has not been built in\n",
+		      stderr);
+		goto out_fd;
+	}
+
+	cmp = compressor_create(super.compression_id, false, super.block_size);
+	if (cmp == NULL)
+		goto out_fd;
+
+	if (read_fstree(&fs, fd, &super, cmp, unpack_flags))
+		goto out_cmp;
+
+	switch (op) {
+	case OP_LS:
+		n = find_node(fs.root, cmdpath);
+		if (n == NULL) {
+			perror(cmdpath);
+			goto out_fs;
+		}
+
+		list_files(n);
+		break;
+	case OP_CAT:
+		n = find_node(fs.root, cmdpath);
+		if (n == NULL) {
+			perror(cmdpath);
+			goto out_fs;
+		}
+
+		if (!S_ISREG(n->mode)) {
+			fprintf(stderr, "/%s: not a regular file\n", cmdpath);
+			goto out_fs;
+		}
+
+		if (super.fragment_entry_count > 0 &&
+		    super.fragment_table_start < super.bytes_used &&
+		    !(super.flags & SQFS_FLAG_NO_FRAGMENTS)) {
+			frag = frag_reader_create(&super, fd, cmp);
+			if (frag == NULL)
+				goto out_fs;
+		}
+
+		if (extract_file(n->data.file, cmp, super.block_size,
+				 frag, fd, STDOUT_FILENO)) {
+			goto out_fs;
+		}
+		break;
+	case OP_UNPACK:
+		if (super.fragment_entry_count > 0 &&
+		    super.fragment_table_start < super.bytes_used &&
+		    !(super.flags & SQFS_FLAG_NO_FRAGMENTS)) {
+			frag = frag_reader_create(&super, fd, cmp);
+			if (frag == NULL)
+				goto out_fs;
+		}
+
+		if (restore_fstree(unpack_root, fs.root, cmp, super.block_size,
+				   frag, fd, unpack_flags)) {
+			goto out_fs;
+		}
+		break;
+	}
+
+	status = EXIT_SUCCESS;
+out_fs:
+	if (frag != NULL)
+		frag_reader_destroy(frag);
+	fstree_cleanup(&fs);
+out_cmp:
+	cmp->destroy(cmp);
+out_fd:
+	close(fd);
+out_cmd:
+	free(cmdpath);
+	return status;
+fail_arg:
+	fprintf(stderr, "Try `%s --help' for more information.\n", __progname);
+	free(cmdpath);
+	return EXIT_FAILURE;
+}