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// SPDX-License-Identifier: GPL-2.0-only
// SPDX-FileCopyrightText: © 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
/* readlink.c - read value of a symbolic link */
#include <common.h>
#include <command.h>
#include <libgen.h>
#include <environment.h>
#include <fs.h>
#include <malloc.h>
#include <getopt.h>
static int do_readlink(int argc, char *argv[])
{
char realname[PATH_MAX];
int canonicalize = 0;
int opt;
memset(realname, 0, PATH_MAX);
while ((opt = getopt(argc, argv, "f")) > 0) {
switch (opt) {
case 'f':
canonicalize = 1;
break;
}
}
if (argc < optind + 2)
return COMMAND_ERROR_USAGE;
if (canonicalize) {
char *buf = canonicalize_path(AT_FDCWD, argv[optind]);
struct stat s;
if (!buf)
goto err;
if (stat(dirname(argv[optind]), &s) || !S_ISDIR(s.st_mode)) {
free(buf);
goto err;
}
setenv(argv[optind + 1], buf);
free(buf);
} else {
if (readlink(argv[optind], realname, PATH_MAX - 1) < 0)
goto err;
setenv(argv[optind + 1], realname);
}
return 0;
err:
unsetenv(argv[optind + 1]);
return 1;
}
BAREBOX_CMD_HELP_START(readlink)
BAREBOX_CMD_HELP_TEXT("Read value of a symbolic link or canonical file name and store it into VARIABLE.")
BAREBOX_CMD_HELP_TEXT("")
BAREBOX_CMD_HELP_TEXT("Options:")
BAREBOX_CMD_HELP_OPT("-f", "canonicalize by following symlinks;")
BAREBOX_CMD_HELP_OPT("", "final component need not exist");
BAREBOX_CMD_HELP_END
BAREBOX_CMD_START(readlink)
.cmd = do_readlink,
BAREBOX_CMD_DESC("read value of a symbolic link or canonical file name")
BAREBOX_CMD_OPTS("[-f] FILE VARIABLE")
BAREBOX_CMD_GROUP(CMD_GRP_FILE)
BAREBOX_CMD_HELP(cmd_readlink_help)
BAREBOX_CMD_END
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