Small utility collection for dealing with file archives that have dependencies
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pkg-utils/main/cmd/unpack.c

119 lines
2.7 KiB

/* SPDX-License-Identifier: ISC */
#include <getopt.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include "util/util.h"
#include "pkgreader.h"
#include "command.h"
#include "pkgio.h"
static const struct option long_opts[] = {
{ "root", required_argument, NULL, 'r' },
{ "no-chown", no_argument, NULL, 'o' },
{ "no-chmod", no_argument, NULL, 'm' },
{ "no-symlinks", no_argument, NULL, 'L' },
{ "no-devices", no_argument, NULL, 'D' },
{ NULL, 0, NULL, 0 },
};
static const char *short_opts = "r:omLD";
static int cmd_unpack(int argc, char **argv)
{
const char *root = NULL, *filename;
int i, rootfd, flags = 0;
pkg_reader_t *rd;
for (;;) {
i = getopt_long(argc, argv, short_opts, long_opts, NULL);
if (i == -1)
break;
switch (i) {
case 'r':
root = optarg;
break;
case 'L':
flags |= UNPACK_NO_SYMLINKS;
break;
case 'D':
flags |= UNPACK_NO_DEVICES;
break;
case 'o':
flags |= UNPACK_NO_CHOWN;
break;
case 'm':
flags |= UNPACK_NO_CHMOD;
break;
default:
tell_read_help(argv[0]);
return EXIT_FAILURE;
}
}
if (optind >= argc) {
fputs("missing argument: package file\n", stderr);
return EXIT_FAILURE;
}
filename = argv[optind++];
if (optind < argc)
fputs("warning: ignoring extra arguments\n", stderr);
if (root == NULL) {
rootfd = AT_FDCWD;
} else {
if (mkdir_p(root))
return EXIT_FAILURE;
rootfd = open(root, O_RDONLY | O_DIRECTORY);
if (rootfd < 0) {
perror(root);
return EXIT_FAILURE;
}
}
rd = pkg_reader_open(filename);
if (rd == NULL)
goto fail_rootfd;
if (pkg_unpack(rootfd, flags, rd))
goto fail;
pkg_reader_close(rd);
if (rootfd != AT_FDCWD)
close(rootfd);
return EXIT_SUCCESS;
fail:
pkg_reader_close(rd);
fail_rootfd:
if (rootfd != AT_FDCWD)
close(rootfd);
return EXIT_FAILURE;
}
static command_t unpack = {
.cmd = "unpack",
.usage = "[OPTIONS...] <pkgfile>",
.s_desc = "unpack the contents of a package file",
.l_desc =
"The unpack command extracts the file hierarchy stored in a package into\n"
"a destination directory (default: current working directory).\n"
"\n"
"Possible options:\n"
" --root, -r <directory> A root directory to unpack the package. Defaults\n"
" to the current working directory if not set.\n"
" --no-chown, -o Do not change ownership of the extracted data.\n"
" Keep the uid/gid of the user who runs the program.\n"
" --no-chmod, -m Do not change permission flags of the extarcted\n"
" data. Use 0644 for all files and 0755 for all\n"
" directories.\n",
.run_cmd = cmd_unpack,
};
REGISTER_COMMAND(unpack)