81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
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* readlink.c - read value of a symbolic link
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*
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* Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <command.h>
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#include <libgen.h>
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#include <environment.h>
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#include <fs.h>
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#include <malloc.h>
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#include <getopt.h>
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static int do_readlink(int argc, char *argv[])
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{
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char realname[PATH_MAX];
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int canonicalize = 0;
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int opt;
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memset(realname, 0, PATH_MAX);
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while ((opt = getopt(argc, argv, "f")) > 0) {
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switch (opt) {
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case 'f':
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canonicalize = 1;
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break;
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}
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}
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if (argc < optind + 2)
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return COMMAND_ERROR_USAGE;
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if (readlink(argv[optind], realname, PATH_MAX - 1) < 0)
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goto err;
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if (canonicalize) {
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char *buf = normalise_link(argv[optind], realname);
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if (!buf)
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goto err;
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setenv(argv[optind + 1], buf);
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free(buf);
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} else {
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setenv(argv[optind + 1], realname);
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}
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return 0;
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err:
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setenv(argv[optind + 1], "");
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return 1;
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}
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BAREBOX_CMD_HELP_START(readlink)
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BAREBOX_CMD_HELP_TEXT("Read value of a symbolic link and store it into VARIABLE.")
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BAREBOX_CMD_HELP_TEXT("")
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BAREBOX_CMD_HELP_TEXT("Options:")
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BAREBOX_CMD_HELP_OPT ("-f", "canonicalize by following first symlink");
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BAREBOX_CMD_HELP_END
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BAREBOX_CMD_START(readlink)
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.cmd = do_readlink,
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BAREBOX_CMD_DESC("read value of a symbolic link")
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BAREBOX_CMD_OPTS("[-f] FILE VARIABLE")
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BAREBOX_CMD_GROUP(CMD_GRP_FILE)
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BAREBOX_CMD_HELP(cmd_readlink_help)
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BAREBOX_CMD_END
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