x86: better rootfs handling
This commit is contained in:
Matthias Schiffer
parent
6f1594666d
commit
22b14a5f54
@ -0,0 +1,70 @@
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From: Matthias Schiffer <mschiffer@universe-factory.net>
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Date: Sun, 15 Mar 2015 18:06:49 +0100
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Subject: firmware-utils: allow passing a specific MBR signature to ptgen
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Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
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diff --git a/tools/firmware-utils/src/ptgen.c b/tools/firmware-utils/src/ptgen.c
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index 0247fd0..6379ed7 100644
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--- a/tools/firmware-utils/src/ptgen.c
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+++ b/tools/firmware-utils/src/ptgen.c
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@@ -28,6 +28,7 @@
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#include <stdio.h>
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#include <ctype.h>
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#include <fcntl.h>
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+#include <stdint.h>
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define cpu_to_le16(x) bswap_16(x)
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@@ -124,7 +125,7 @@ static inline unsigned long round_to_kb(long sect) {
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}
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/* check the partition sizes and write the partition table */
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-static int gen_ptable(int nr)
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+static int gen_ptable(uint32_t signature, int nr)
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{
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struct pte pte[4];
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unsigned long sect = 0;
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@@ -159,6 +160,12 @@ static int gen_ptable(int nr)
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return -1;
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}
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+ lseek(fd, 440, SEEK_SET);
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+ if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
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+ fprintf(stderr, "write failed.\n");
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+ goto fail;
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+ }
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+
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lseek(fd, 446, SEEK_SET);
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if (write(fd, pte, sizeof(struct pte) * 4) != sizeof(struct pte) * 4) {
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fprintf(stderr, "write failed.\n");
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@@ -187,8 +194,9 @@ int main (int argc, char **argv)
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char type = 0x83;
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int ch;
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int part = 0;
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+ uint32_t signature = 0x5452574F; /* 'OWRT' */
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- while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vl:")) != -1) {
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+ while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vl:S:")) != -1) {
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switch (ch) {
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case 'o':
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filename = optarg;
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@@ -221,6 +229,9 @@ int main (int argc, char **argv)
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case 'l':
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kb_align = (int) strtoul(optarg, NULL, 0) * 2;
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break;
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+ case 'S':
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+ signature = strtoul(optarg, NULL, 0);
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+ break;
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case '?':
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default:
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usage(argv[0]);
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@@ -229,6 +240,6 @@ int main (int argc, char **argv)
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argc -= optind;
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if (argc || (heads <= 0) || (sectors <= 0) || !filename)
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usage(argv[0]);
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-
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- return gen_ptable(part);
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+
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+ return gen_ptable(signature, part);
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}
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@ -0,0 +1,180 @@
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From: Matthias Schiffer <mschiffer@universe-factory.net>
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Date: Sun, 15 Mar 2015 17:01:32 +0100
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Subject: x86: use PARTUUID instead explicitly specifying the device by default
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This changes the x86 image generation to match x86_64, using the PARTUUID for
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the rootfs instead of explicitly configuring the device.
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It unbreaks KVM with VirtIO, which uses /dev/vda2 instead of /dev/sda2.
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Tested in QEMU/KVM with VirtIO, VirtualBox and VMware.
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diff --git a/config/Config-images.in b/config/Config-images.in
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index 39e51e4..f44ec73 100644
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--- a/config/Config-images.in
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+++ b/config/Config-images.in
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@@ -267,8 +267,6 @@ menu "Target Images"
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config TARGET_ROOTFS_PARTNAME
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string "Root partition on target device"
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depends on OLPC_BOOTSCRIPT_IMAGES || GRUB_IMAGES
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- default "/dev/xvda2" if TARGET_x86_xen_domu
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- default "/dev/sda2" if ! TARGET_x86_xen_domu
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help
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The root partition on the final device. If you don't know,
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you probably want the default (/dev/sda2).
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diff --git a/target/linux/x86/base-files/lib/preinit/79_move_config b/target/linux/x86/base-files/lib/preinit/79_move_config
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index 0bffbab..1d4873d 100644
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--- a/target/linux/x86/base-files/lib/preinit/79_move_config
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+++ b/target/linux/x86/base-files/lib/preinit/79_move_config
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@@ -1,21 +1,14 @@
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#!/bin/sh
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-# Copyright (C) 2012 OpenWrt.org
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+# Copyright (C) 2012-2015 OpenWrt.org
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move_config() {
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- local rootfsdev
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- local rootfstype
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-
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- rootfstype="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "rootfstype") { print $2 }' < /proc/cmdline)"
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- case "$rootfstype" in
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- squashfs|jffs2)
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- rootfsdev="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "block2mtd.block2mtd") { print substr($2,1,index($2, ",")-1) }' < /proc/cmdline)";;
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- ext4)
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- rootfsdev="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "root") { print $2 }' < /proc/cmdline)";;
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- esac
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+ . /lib/upgrade/platform.sh
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- mount -t ext4 -o rw,noatime "${rootfsdev%[0-9]}1" /mnt
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- mv -f /mnt/sysupgrade.tgz /
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- umount /mnt
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+ if platform_export_bootpart; then
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+ mount -t ext4 -o rw,noatime "$BOOTPART" /mnt
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+ mv -f /mnt/sysupgrade.tgz /
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+ umount /mnt
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+ fi
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}
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boot_hook_add preinit_mount_root move_config
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diff --git a/target/linux/x86/base-files/lib/upgrade/platform.sh b/target/linux/x86/base-files/lib/upgrade/platform.sh
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index a2dd20a..73ab5ef 100644
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--- a/target/linux/x86/base-files/lib/upgrade/platform.sh
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+++ b/target/linux/x86/base-files/lib/upgrade/platform.sh
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@@ -1,16 +1,38 @@
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-x86_get_rootfs() {
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- local rootfsdev
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- local rootfstype
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-
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- rootfstype="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "rootfstype") { print $2 }' < /proc/cmdline)"
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- case "$rootfstype" in
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- squashfs|jffs2)
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- rootfsdev="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "block2mtd.block2mtd") { print substr($2,1,index($2, ",")-1) }' < /proc/cmdline)";;
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- ext4)
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- rootfsdev="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "root") { print $2 }' < /proc/cmdline)";;
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- esac
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-
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- echo "$rootfstype:$rootfsdev"
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+platform_export_bootpart() {
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+ local cmdline uuid disk
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+
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+ if read cmdline < /proc/cmdline; then
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+ case "$cmdline" in
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+ *block2mtd=*)
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+ disk="${cmdline##*block2mtd=}"
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+ disk="${disk%%,*}"
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+ ;;
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+ *root=*)
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+ disk="${cmdline##*root=}"
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+ disk="${disk%% *}"
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+ ;;
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+ esac
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+
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+ case "$disk" in
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+ PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-02)
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+ uuid="${disk#PARTUUID=}"
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+ uuid="${uuid%-02}"
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+ for disk in /dev/[hsv]d[a-z]; do
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+ set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
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+ if [ "$4$3$2$1" = "$uuid" ]; then
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+ export BOOTPART="${disk}1"
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+ return 0
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+ fi
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+ done
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+ ;;
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+ /dev/*)
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+ export BOOTPART="${disk%[0-9]}1"
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+ return 0
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+ ;;
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+ esac
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+ fi
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+
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+ return 1
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}
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platform_check_image() {
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@@ -26,19 +48,19 @@ platform_check_image() {
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}
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platform_copy_config() {
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- local rootfs="$(x86_get_rootfs)"
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- local rootfsdev="${rootfs##*:}"
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-
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- mount -t ext4 -o rw,noatime "${rootfsdev%[0-9]}1" /mnt
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- cp -af "$CONF_TAR" /mnt/
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- umount /mnt
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+ if [ -b "$BOOTPART" ]; then
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+ mount -t ext4 -o rw,noatime "$BOOTPART" /mnt
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+ cp -af "$CONF_TAR" /mnt/
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+ umount /mnt
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+ fi
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}
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platform_do_upgrade() {
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- local rootfs="$(x86_get_rootfs)"
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- local rootfsdev="${rootfs##*:}"
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+ platform_export_bootpart
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- sync
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- [ -b ${rootfsdev%[0-9]} ] && get_image "$@" | dd of=${rootfsdev%[0-9]} bs=4096 conv=fsync
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- sleep 1
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+ if [ -b "${BOOTPART%[0-9]}" ]; then
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+ sync
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+ get_image "$@" | dd of="${BOOTPART%[0-9]}" bs=4096 conv=fsync
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+ sleep 1
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+ fi
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}
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diff --git a/target/linux/x86/image/Makefile b/target/linux/x86/image/Makefile
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index 5983718..a0045a7 100644
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--- a/target/linux/x86/image/Makefile
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+++ b/target/linux/x86/image/Makefile
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@@ -40,7 +40,9 @@ ifneq ($(GRUB_TERMINALS),)
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GRUB_TERMINAL_CONFIG := terminal_input $(GRUB_TERMINALS); terminal_output $(GRUB_TERMINALS)
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endif
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+SIGNATURE:=$(shell dd if=/dev/urandom bs=4 count=1 2>/dev/null | hexdump -v -e '"%02x"')
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ROOTPART:=$(call qstrip,$(CONFIG_TARGET_ROOTFS_PARTNAME))
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+ROOTPART:=$(if $(ROOTPART),$(ROOTPART),PARTUUID=$(SIGNATURE)-02)
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GRUB_TIMEOUT:=$(call qstrip,$(CONFIG_GRUB_TIMEOUT))
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@@ -82,7 +84,7 @@ ifneq ($(CONFIG_GRUB_IMAGES),)
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-e 's#@CMDLINE@#$(strip $(call Image/cmdline/$(1)) $(BOOTOPTS) $(GRUB_CONSOLE_CMDLINE))#g' \
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-e 's#@TIMEOUT@#$(GRUB_TIMEOUT)#g' \
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./grub.cfg > $(KDIR)/root.grub/boot/grub/grub.cfg
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- PADDING="$(CONFIG_TARGET_IMAGES_PAD)" PATH="$(TARGET_PATH)" ./gen_image_generic.sh \
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+ PADDING="$(CONFIG_TARGET_IMAGES_PAD)" SIGNATURE="$(SIGNATURE)" PATH="$(TARGET_PATH)" ./gen_image_generic.sh \
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$(BIN_DIR)/$(IMG_PREFIX)-combined-$(1).img \
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$(CONFIG_TARGET_KERNEL_PARTSIZE) $(KDIR)/root.grub \
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$(CONFIG_TARGET_ROOTFS_PARTSIZE) $(KDIR)/root.$(1) \
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diff --git a/target/linux/x86/image/gen_image_generic.sh b/target/linux/x86/image/gen_image_generic.sh
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index 9d11efb..3fb31f6 100755
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--- a/target/linux/x86/image/gen_image_generic.sh
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+++ b/target/linux/x86/image/gen_image_generic.sh
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@@ -20,7 +20,7 @@ sect=63
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cyl=$(( ($KERNELSIZE + $ROOTFSSIZE) * 1024 * 1024 / ($head * $sect * 512)))
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# create partition table
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-set `ptgen -o "$OUTPUT" -h $head -s $sect -p ${KERNELSIZE}m -p ${ROOTFSSIZE}m ${ALIGN:+-l $ALIGN}`
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+set `ptgen -o "$OUTPUT" -h $head -s $sect -p ${KERNELSIZE}m -p ${ROOTFSSIZE}m ${ALIGN:+-l $ALIGN} ${SIGNATURE:+-S 0x$SIGNATURE}`
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KERNELOFFSET="$(($1 / 512))"
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KERNELSIZE="$(($2 / 512))"
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@ -1,3 +1,2 @@
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CONFIG_TARGET_x86=y
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CONFIG_TARGET_x86_kvm_guest=y
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CONFIG_TARGET_ROOTFS_PARTNAME="/dev/vda2"
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