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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* options.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "tar2sqfs.h"
enum {
NO_PAD_OPTION = 1,
};
static struct option long_opts[] = {
{ "no-pad", no_argument, NULL, NO_PAD_OPTION },
{ "root-becomes", required_argument, NULL, 'r' },
{ "compressor", required_argument, NULL, 'c' },
{ "block-size", required_argument, NULL, 'b' },
{ "dev-block-size", required_argument, NULL, 'B' },
{ "defaults", required_argument, NULL, 'd' },
{ "num-jobs", required_argument, NULL, 'j' },
{ "queue-backlog", required_argument, NULL, 'Q' },
{ "comp-extra", required_argument, NULL, 'X' },
{ "no-skip", no_argument, NULL, 's' },
{ "no-xattr", no_argument, NULL, 'x' },
{ "no-keep-time", no_argument, NULL, 'k' },
{ "exportable", no_argument, NULL, 'e' },
{ "no-symlink-retarget", no_argument, NULL, 'S' },
{ "no-tail-packing", no_argument, NULL, 'T' },
{ "force", no_argument, NULL, 'f' },
{ "exclude-dir", required_argument, NULL, 'E' },
{ "quiet", no_argument, NULL, 'q' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 },
};
static const char *short_opts = "r:c:b:B:d:X:j:Q:sxekfqE:SThV";
static const char *usagestr =
"Usage: tar2sqfs [OPTIONS...] <sqfsfile>\n"
"\n"
"Read a tar archive from stdin and turn it into a squashfs filesystem image.\n"
"\n"
"Possible options:\n"
"\n"
" --root-becomes, -r <dir> The specified directory becomes the root.\n"
" Only its children are packed into the image\n"
" and its attributes (ownership, permissions,\n"
" xattrs, ...) are stored in the root inode.\n"
" If not set and a tarbal has an entry for './'\n"
" or '/', it becomes the root instead.\n"
" --no-symlink-retarget, -S If --root-becomes is used, link targets are\n"
" adjusted if they are prefixed by the root\n"
" path. If this flag is set, symlinks are left\n"
" untouched and only hard links are changed.\n"
"\n"
" --compressor, -c <name> Select the compressor to use.\n"
" A list of available compressors is below.\n"
" --comp-extra, -X <options> A comma separated list of extra options for\n"
" the selected compressor. Specify 'help' to\n"
" get a list of available options.\n"
" --num-jobs, -j <count> Number of compressor jobs to create.\n"
" --queue-backlog, -Q <count> Maximum number of data blocks in the thread\n"
" worker queue before the packer starts waiting\n"
" for the block processors to catch up.\n"
" Defaults to 10 times the number of jobs.\n"
" --block-size, -b <size> Block size to use for Squashfs image.\n"
" Defaults to %u.\n"
" --dev-block-size, -B <size> Device block size to padd the image to.\n"
" Defaults to %u.\n"
" --defaults, -d <options> A comma separated list of default values for\n"
" implicitly created directories.\n"
"\n"
" Possible options:\n"
" uid=<value> 0 if not set.\n"
" gid=<value> 0 if not set.\n"
" mode=<value> 0755 if not set.\n"
" mtime=<value> 0 if not set.\n"
"\n"
" --no-skip, -s Abort if a tar record cannot be read instead\n"
" of skipping it.\n"
" --no-xattr, -x Do not copy extended attributes from archive.\n"
" --no-keep-time, -k Do not keep the time stamps stored in the\n"
" archive. Instead, set defaults on all files.\n"
" --exportable, -e Generate an export table for NFS support.\n"
" --no-tail-packing, -T Do not perform tail end packing on files that\n"
" are larger than block size.\n"
" --exclude-dir, -E <glob> Skip tar entry if glob matches.\n"
" --no-pad Do not pad image to device block size.\n"
" --force, -f Overwrite the output file if it exists.\n"
" --quiet, -q Do not print out progress reports.\n"
" --help, -h Print help text and exit.\n"
" --version, -V Print version information and exit.\n"
"\n";
bool dont_skip = false;
bool keep_time = true;
bool no_tail_pack = false;
bool no_symlink_retarget = false;
sqfs_writer_cfg_t cfg;
char *root_becomes = NULL;
char **excludedirs = NULL;
size_t num_excludedirs = 0;
static size_t max_excludedirs = 0;
static void input_compressor_print_available(void)
{
int i = IO_COMPRESSOR_MIN;
const char *name;
fputs("\nSupported tar compression formats:\n", stdout);
while (i <= IO_COMPRESSOR_MAX) {
name = io_compressor_name_from_id(i);
if (io_compressor_exists(i))
printf("\t%s\n", name);
++i;
}
fputs("\tuncompressed\n", stdout);
fputc('\n', stdout);
}
void process_args(int argc, char **argv)
{
size_t idx, new_count;
bool have_compressor;
int i, ret;
char **new;
sqfs_writer_cfg_init(&cfg);
for (;;) {
i = getopt_long(argc, argv, short_opts, long_opts, NULL);
if (i == -1)
break;
switch (i) {
case NO_PAD_OPTION:
cfg.no_pad = true;
break;
case 'S':
no_symlink_retarget = true;
break;
case 'T':
no_tail_pack = true;
break;
case 'b':
if (parse_size("Block size", &cfg.block_size,
optarg, 0)) {
goto fail;
}
break;
case 'B':
if (parse_size("Device block size", &cfg.devblksize,
optarg, 0)) {
goto fail;
}
if (cfg.devblksize < 1024) {
fputs("Device block size must be at "
"least 1024\n", stderr);
goto fail;
}
break;
case 'c':
have_compressor = true;
ret = sqfs_compressor_id_from_name(optarg);
if (ret < 0) {
have_compressor = false;
#ifdef WITH_LZO
if (cfg.comp_id == SQFS_COMP_LZO)
have_compressor = true;
#endif
}
if (!have_compressor) {
fprintf(stderr, "Unsupported compressor '%s'\n",
optarg);
goto fail;
}
cfg.comp_id = ret;
break;
case 'j':
cfg.num_jobs = strtol(optarg, NULL, 0);
break;
case 'Q':
cfg.max_backlog = strtol(optarg, NULL, 0);
break;
case 'X':
cfg.comp_extra = optarg;
break;
case 'd':
cfg.fs_defaults = optarg;
break;
case 'x':
cfg.no_xattr = true;
break;
case 'k':
keep_time = false;
break;
case 'r':
free(root_becomes);
root_becomes = strdup(optarg);
if (root_becomes == NULL) {
perror("copying root directory name");
goto fail;
}
if (canonicalize_name(root_becomes) != 0 ||
strlen(root_becomes) == 0) {
fprintf(stderr,
"Invalid root directory '%s'.\n",
optarg);
goto fail_arg;
}
break;
case 's':
dont_skip = true;
break;
case 'e':
cfg.exportable = true;
break;
case 'f':
cfg.outmode |= SQFS_FILE_OPEN_OVERWRITE;
break;
case 'q':
cfg.quiet = true;
break;
case 'E':
if (num_excludedirs == max_excludedirs) {
new_count = max_excludedirs ? max_excludedirs * 2 : 16;
new = realloc(excludedirs,
new_count * sizeof(excludedirs[0]));
if (new == NULL)
goto fail_errno;
max_excludedirs = new_count;
excludedirs = new;
}
excludedirs[num_excludedirs] = strdup(optarg);
if (excludedirs[num_excludedirs] == NULL)
goto fail_errno;
if (canonicalize_name(excludedirs[num_excludedirs])) {
perror(optarg);
goto fail;
}
++num_excludedirs;
break;
case 'h':
printf(usagestr, SQFS_DEFAULT_BLOCK_SIZE,
SQFS_DEVBLK_SIZE);
compressor_print_available();
input_compressor_print_available();
goto out_success;
case 'V':
print_version("tar2sqfs");
goto out_success;
default:
goto fail_arg;
}
}
if (cfg.num_jobs < 1)
cfg.num_jobs = 1;
if (cfg.max_backlog < 1)
cfg.max_backlog = 10 * cfg.num_jobs;
if (cfg.comp_extra != NULL && strcmp(cfg.comp_extra, "help") == 0) {
compressor_print_help(cfg.comp_id);
exit(EXIT_SUCCESS);
}
if (optind >= argc) {
fputs("Missing argument: squashfs image\n", stderr);
goto fail_arg;
}
cfg.filename = argv[optind++];
if (optind < argc) {
fputs("Unknown extra arguments specified.\n", stderr);
goto fail_arg;
}
return;
fail_errno:
perror("parsing options");
goto fail;
fail_arg:
fputs("Try `tar2sqfsr --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_excludedirs; ++idx)
free(excludedirs[idx]);
free(root_becomes);
free(excludedirs);
exit(ret);
}
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