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/* 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[] = {
{ "compressor", required_argument, NULL, 'c' },
{ "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 = "c: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"
" --compressor, -c <name> If set, stream compress the resulting tarball.\n"
" By default, the tarball is uncompressed.\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"
"Available compressors:\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;
int compressor = 0;
const char *filename = NULL;
void process_args(int argc, char **argv)
{
size_t idx, new_count;
const char *name;
int i, ret;
void *new;
for (;;) {
i = getopt_long(argc, argv, short_opts, long_opts, NULL);
if (i == -1)
break;
switch (i) {
case 'c':
compressor = fstream_compressor_id_from_name(optarg);
if (compressor <= 0) {
fprintf(stderr, "unknown compressor '%s'.\n",
optarg);
goto fail;
}
if (!fstream_compressor_exists(compressor)) {
fprintf(stderr,
"%s compressor is not supported.\n",
optarg);
goto fail;
}
break;
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);
i = FSTREAM_COMPRESSOR_MIN;
while (i <= FSTREAM_COMPRESSOR_MAX) {
name = fstream_compressor_name_from_id(i);
if (fstream_compressor_exists(i))
printf("\t%s\n", name);
++i;
}
fputc('\n', 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);
}
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