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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* options.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#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' },
{ "no-sparse", no_argument, NULL, 'Z' },
{ "jobs", required_argument, NULL, 'j' },
{ "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:DSFLCOEZj:dqhV";
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"
" --no-sparse, -Z Do not create sparse files, always write zero\n"
" blocks to disk.\n"
" --jobs, -j <count> Number of parallel unpacking jobs to start.\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, j;
opt->op = OP_NONE;
opt->rdtree_flags = 0;
opt->flags = 0;
opt->cmdpath = NULL;
opt->unpack_root = NULL;
opt->image_name = NULL;
opt->num_jobs = 1;
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 'Z':
opt->flags |= UNPACK_NO_SPARSE;
break;
case 'j':
for (j = 0; optarg[j] != '\0'; ++j) {
if (j > 6 || !isdigit(optarg[j]))
goto fail_num_jobs;
}
opt->num_jobs = atoi(optarg);
if (opt->num_jobs < 1)
goto fail_num_jobs;
break;
case 'c':
opt->op = OP_CAT;
opt->cmdpath = get_path(opt->cmdpath, optarg);
break;
case 'd':
opt->op = OP_DESCRIBE;
free(opt->cmdpath);
opt->cmdpath = NULL;
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);
fail_num_jobs:
fputs("Expected a positive integer for --jobs.\n", stderr);
goto fail_arg;
}
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