From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 8.mo2.mail-out.ovh.net ([188.165.52.147] helo=mo2.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T7mx0-0006RQ-Rs for barebox@lists.infradead.org; Sat, 01 Sep 2012 12:37:28 +0000 Received: from mail21.ha.ovh.net (b6.ovh.net [213.186.33.56]) by mo2.mail-out.ovh.net (Postfix) with SMTP id 3942BDC7056 for ; Sat, 1 Sep 2012 14:42:34 +0200 (CEST) From: Jean-Christophe PLAGNIOL-VILLARD Date: Sat, 1 Sep 2012 14:37:25 +0200 Message-Id: <1346503053-21862-10-git-send-email-plagnioj@jcrosoft.com> In-Reply-To: <1346503053-21862-1-git-send-email-plagnioj@jcrosoft.com> References: <20120901123511.GA19233@game.jcrosoft.org> <1346503053-21862-1-git-send-email-plagnioj@jcrosoft.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 10/18] command: add readlink support To: barebox@lists.infradead.org Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- commands/Kconfig | 6 ++++ commands/Makefile | 1 + commands/readlink.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 87 insertions(+) create mode 100644 commands/readlink.c diff --git a/commands/Kconfig b/commands/Kconfig index 92a8152..876f2f8 100644 --- a/commands/Kconfig +++ b/commands/Kconfig @@ -220,6 +220,12 @@ config CMD_DIRNAME Strip last component of file name and store the result in a environment variable +config CMD_READLINK + tristate + prompt "readlink" + help + read value of a symbolic link + endmenu menu "console " diff --git a/commands/Makefile b/commands/Makefile index e9157bf..ab6c7ea 100644 --- a/commands/Makefile +++ b/commands/Makefile @@ -72,3 +72,4 @@ obj-$(CONFIG_CMD_AUTOMOUNT) += automount.o obj-$(CONFIG_CMD_GLOBAL) += global.o obj-$(CONFIG_CMD_BASENAME) += basename.o obj-$(CONFIG_CMD_DIRNAME) += dirname.o +obj-$(CONFIG_CMD_READLINK) += readlink.o diff --git a/commands/readlink.c b/commands/readlink.c new file mode 100644 index 0000000..d2671e0 --- /dev/null +++ b/commands/readlink.c @@ -0,0 +1,80 @@ +/* + * readlink.c - read value of a symbolic link + * + * Copyright (c) 2012 Jean-Christophe PLAGNIOL-VILLARD + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include +#include +#include +#include +#include +#include +#include + +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 (readlink(argv[optind], realname, PATH_MAX - 1) < 0) + goto err; + + if (canonicalize) { + char *buf = normalise_link(argv[optind], realname); + + if (!buf) + goto err; + setenv(argv[optind + 1], buf); + free(buf); + } else { + setenv(argv[optind + 1], realname); + } + + return 0; +err: + setenv(argv[optind + 1], ""); + return 1; +} + +BAREBOX_CMD_HELP_START(readlink) +BAREBOX_CMD_HELP_USAGE("readlink [-f] FILE REALNAME\n") +BAREBOX_CMD_HELP_SHORT("read value of a symbolic link and store into $REALNAME\n") +BAREBOX_CMD_HELP_SHORT("-f canonicalize by following first symlink"); +BAREBOX_CMD_HELP_END + +BAREBOX_CMD_START(readlink) + .cmd = do_readlink, + .usage = "read value of a symbolic link", + BAREBOX_CMD_HELP(cmd_readlink_help) +BAREBOX_CMD_END -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox