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authorSascha Hauer <s.hauer@pengutronix.de>2012-04-29 20:21:16 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2012-05-14 08:57:01 +0200
commitb8c94a15611ce7e191d022a3cd9f3ba23930a9c8 (patch)
treef0daa10332462b729219562cfca592c0f9268770 /commands/global.c
parent9b42dfff0f2cecb6a9c7581c4c0c59ed9c9c586d (diff)
downloadbarebox-b8c94a15611ce7e191d022a3cd9f3ba23930a9c8.tar.gz
add 'global' command
This implements global shell variable support. This is done by registering a new device named 'global', so global variables are just plain device parameters. Global variables are useful for storing the global state in the environment. Currently we do this by sourcing scripts instead of executing them which is quite limiting. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/global.c')
-rw-r--r--commands/global.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/commands/global.c b/commands/global.c
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+/*
+ * global.c - global shell variables
+ *
+ * Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * 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 <malloc.h>
+#include <command.h>
+#include <globalvar.h>
+#include <environment.h>
+
+static int do_global(int argc, char *argv[])
+{
+ int ret;
+ char *value;
+
+ if (argc != 2)
+ return COMMAND_ERROR_USAGE;
+
+ value = strchr(argv[1], '=');
+ if (value) {
+ *value = 0;
+ value++;
+ }
+
+ ret = globalvar_add_simple(argv[1]);
+
+ if (value) {
+ char *name = asprintf("global.%s", argv[1]);
+ ret = setenv(name, value);
+ free(name);
+ }
+
+ return ret ? 1 : 0;
+}
+
+BAREBOX_CMD_HELP_START(global)
+BAREBOX_CMD_HELP_USAGE("global <var>[=<value]\n")
+BAREBOX_CMD_HELP_SHORT("add a new global variable named <var>, optionally set to <value>\n")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(global)
+ .cmd = do_global,
+ .usage = "create global variables",
+ BAREBOX_CMD_HELP(cmd_global_help)
+BAREBOX_CMD_END