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Diffstat (limited to 'unpack/options.c')
| -rw-r--r-- | unpack/options.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/unpack/options.c b/unpack/options.c new file mode 100644 index 0000000..ccfe7c8 --- /dev/null +++ b/unpack/options.c @@ -0,0 +1,171 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +#include "rdsquashfs.h" + +static struct option long_opts[] = { + { "list", required_argument, NULL, 'l' }, + { "cat", required_argument, NULL, 'c' }, + { "unpack-root", required_argument, NULL, 'p' }, + { "unpack-path", 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' }, + { "describe", no_argument, NULL, 'd' }, + { "chmod", no_argument, NULL, 'C' }, + { "chown", no_argument, NULL, 'O' }, + { "quiet", no_argument, NULL, 'q' }, + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, 'V' }, +}; + +static const char *short_opts = "l:c:u:p:DSFLCOEdqhV"; + +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" +"\n" +" --list, -l <path> Produce a directory listing for a given path in\n" +" the 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-path, -u <path> Unpack this sub directory from the image. To\n" +" unpack everything, simply specify /.\n" +" --describe, -d Produce a file listing from the image.\n" +"\n" +" --unpack-root, -p <path> If used with --unpack-path, this is where the\n" +" data unpacked to. If used with --describe, this\n" +" is used as a prefix for the input path of\n" +" regular files.\n" +"\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\n" +" empty after applying the above rules.\n" +" --chmod, -C Change permission flags of unpacked files to\n" +" those store in the squashfs image.\n" +" --chown, -O Change ownership of unpacked files to the\n" +" UID/GID set in the squashfs image.\n" +" --quiet, -q Do not print out progress while unpacking.\n" +"\n" +" --help, -h Print help text and exit.\n" +" --version, -V Print version information and exit.\n" +"\n"; + +extern const char *__progname; + +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; +} + +void process_command_line(options_t *opt, int argc, char **argv) +{ + int i; + + opt->op = OP_NONE; + opt->rdtree_flags = 0; + opt->flags = 0; + opt->cmdpath = NULL; + opt->unpack_root = NULL; + opt->image_name = NULL; + + for (;;) { + i = getopt_long(argc, argv, short_opts, long_opts, NULL); + if (i == -1) + break; + + switch (i) { + case 'D': + opt->rdtree_flags |= RDTREE_NO_DEVICES; + break; + case 'S': + opt->rdtree_flags |= RDTREE_NO_SOCKETS; + break; + case 'F': + opt->rdtree_flags |= RDTREE_NO_FIFO; + break; + case 'L': + opt->rdtree_flags |= RDTREE_NO_SLINKS; + break; + case 'E': + opt->rdtree_flags |= RDTREE_NO_EMPTY; + break; + case 'C': + opt->flags |= UNPACK_CHMOD; + break; + case 'O': + opt->flags |= UNPACK_CHOWN; + break; + case 'c': + opt->op = OP_CAT; + opt->cmdpath = get_path(opt->cmdpath, optarg); + break; + case 'd': + opt->op = OP_DESCRIBE; + break; + case 'l': + opt->op = OP_LS; + opt->cmdpath = get_path(opt->cmdpath, optarg); + break; + case 'p': + opt->unpack_root = optarg; + break; + case 'u': + opt->op = OP_UNPACK; + opt->cmdpath = get_path(opt->cmdpath, optarg); + break; + case 'q': + opt->flags |= UNPACK_QUIET; + break; + case 'h': + printf(help_string, __progname); + free(opt->cmdpath); + exit(EXIT_SUCCESS); + case 'V': + print_version(); + free(opt->cmdpath); + exit(EXIT_SUCCESS); + default: + goto fail_arg; + } + } + + if (opt->op == OP_NONE) { + fputs("No opteration specified\n", stderr); + goto fail_arg; + } + + if (optind >= argc) { + fputs("Missing image argument\n", stderr); + goto fail_arg; + } + + opt->image_name = argv[optind++]; + return; +fail_arg: + fprintf(stderr, "Try `%s --help' for more information.\n", __progname); + free(opt->cmdpath); + exit(EXIT_FAILURE); +} |