Add patch-cmdline to patch the RB1xx kernel command line after installation

SVN-Revision: 7193
owl
Florian Fainelli 2007-05-11 22:19:22 +00:00
parent 74998b5e4a
commit 16ee25b91a
2 changed files with 121 additions and 0 deletions

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#
# Copyright (C) 2007 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
# $Id: $
include $(TOPDIR)/rules.mk
PKG_NAME:=patch-cmdline
PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
include $(INCLUDE_DIR)/package.mk
define Package/patch-cmdline
SECTION:=utils
CATEGORY:=Utilities
TITLE:=Patch the kernel command line for RouterBoards
DEPENDS:=@LINUX_2_6_ADM5120||@LINUX_2_6_RB532
DESCRIPTION:=\
A tool to patch the kernel command line on RouterBoards
URL:=https://dev.openwrt.org/browser/trunk/package/patch-cmdline/src/patch-cmdline.c
VERSION:=1
endef
define Build/Prepare
$(CP) ./src/$(PKG_NAME).c $(PKG_BUILD_DIR)/
endef
define Build/Compile
$(CC) -o $(PKG_BUILD_DIR)/$(PKG_NAME) $(PKG_BUILD_DIR)/$(PKG_NAME).c
endef
define Package/patch-cmdline/install
$(INSTALL_DIR) $(1)/sbin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/$(PKG_NAME) $(1)/sbin/
endef
$(eval $(call BuildPackage,patch-cmdline))

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/*
* patch-cmdline.c - patch the kernel command line on rb532
*
* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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.
*
* $Id:$
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <string.h>
#define SEARCH_SPACE (16 * 1024)
#define CMDLINE_MAX 512
int main(int argc, char **argv)
{
int fd, found = 0, len, ret = -1;
char *ptr, *p;
if (argc != 3) {
fprintf(stderr, "Usage: %s <file> <cmdline>\n", argv[0]);
goto err1;
}
len = strlen(argv[2]);
if (len + 9 > CMDLINE_MAX) {
fprintf(stderr, "Command line string too long\n");
goto err1;
}
if (((fd = open(argv[1], O_RDWR)) < 0) ||
(ptr = (char *) mmap(0, SEARCH_SPACE + CMDLINE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) {
fprintf(stderr, "Could not open kernel image");
goto err2;
}
for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) {
if (memcmp(p, "CMDLINE:", 8) == 0) {
found = 1;
p += 8;
break;
}
}
if (!found) {
fprintf(stderr, "Command line marker not found!\n");
goto err3;
}
memset(p, 0, CMDLINE_MAX - 8);
strcpy(p, argv[2]);
msync(p, CMDLINE_MAX, MS_SYNC|MS_INVALIDATE);
ret = 0;
err3:
munmap((void *) ptr, len);
err2:
if (fd > 0)
close(fd);
err1:
return ret;
}