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Diffstat (limited to 'bin/sqfs2tar/options.c')
| -rw-r--r-- | bin/sqfs2tar/options.c | 192 |
1 files changed, 192 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); +} |