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From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: barebox@lists.infradead.org
Subject: [PATCH 11/19] command: add readlink support
Date: Tue,  4 Sep 2012 21:50:09 +0200	[thread overview]
Message-ID: <1346788217-16042-11-git-send-email-plagnioj@jcrosoft.com> (raw)
In-Reply-To: <1346788217-16042-1-git-send-email-plagnioj@jcrosoft.com>

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 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 <plagnioj@jcrosoft.com>
+ *
+ * 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 <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 (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


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  parent reply	other threads:[~2012-09-04 19:50 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-04 19:47 [PATCH 00/18 v5] fs: add symlink and " Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:49 ` [PATCH 01/19] fs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 02/19] fs: fix rmdir with symlink Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 03/19] fs: rename stat to lstat as we implement lstat Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 04/19] fs: add symlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 05/19] fs: implement stat Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 06/19] fs: open: add symlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 07/19] fs: introduce get_mounted_path to get the path where a file is mounted Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 08/19] ramfs: add symlink and readlink support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 09/19] nfs: add " Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 10/19] test: add -L support to test if it's a symbolic link Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-09-04 19:50   ` [PATCH 12/19] command: add ln support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 13/19] ls: add symlink support to -l Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 14/19] dirname: add -V option to return only path related to the mountpoint Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 15/19] recursive_action: add ACTION_FOLLOWLINKS support Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 16/19] envfs: introduce version major and minor Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 17/19] envfs: add support of variable inode size Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 18/19] envfs: add support of symlink Jean-Christophe PLAGNIOL-VILLARD
2012-09-04 19:50   ` [PATCH 19/19] defautenv: " Jean-Christophe PLAGNIOL-VILLARD

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