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Replace "mount -o loop" with explict losetup use in build_image.

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This fixes the loop device leak. The problem is that inside the chroot, we
have /etc/mtab as a symlink to /proc/mounts. That works most of the time,
but if you mount something using "-o loop", it isn't cleaned up correctly
when you umount it. To avoid that, we either have to replace the /etc/mtab
symlink with an empty file when we create the chroot, or we have to make
sure that we never execute a "mount -o loop" command from within the chroot.
If we use an empty /etc/mtab file, the builds work fine, but then we can't
see any mounted partitions that the host creates outside the chroot (such as
USB keys), which causes other problems. Bleah.

Review URL: http://codereview.chromium.org/1594020
This commit is contained in:
Bill Richardson 2010-04-09 08:12:05 -07:00
parent 1e5fe62f92
commit a81df76a06
1 changed files with 22 additions and 8 deletions
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30
build_image
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@ -73,6 +73,7 @@ BOARD_ROOT="${FLAGS_build_root}/${BOARD}"
LOOP_DEV=
STATEFUL_LOOP_DEV=
ESP_LOOP_DEV=
# What cross-build are we targeting?
. "${BOARD_ROOT}/etc/make.conf.board_setup"
@ -129,6 +130,8 @@ cleanup_stateful_fs_loop() {
cleanup_esp_loop() {
sudo umount "$ESP_DIR"
sleep 1
sudo losetup -d "$ESP_LOOP_DEV"
}
cleanup() {
@ -143,7 +146,7 @@ cleanup() {
cleanup_rootfs_loop
fi
if [[ -n "$ESP_DIR" ]]; then
if [[ -n "$ESP_LOOP_DEV" ]]; then
cleanup_esp_loop
fi
@ -358,19 +361,30 @@ ESP_IMG=${OUTPUT_DIR}/esp.image
ESP_BLOCKS=16384
/usr/sbin/mkfs.vfat -C ${OUTPUT_DIR}/esp.image ${ESP_BLOCKS}
ESP_DIR=${OUTPUT_DIR}/esp
mkdir -p ${ESP_DIR}
sudo mount -o loop ${ESP_IMG} ${ESP_DIR}
sudo mkdir -p ${ESP_DIR}/efi/boot
sudo grub-mkimage -p /efi/boot -o ${ESP_DIR}/efi/boot/bootx64.efi \
ESP_LOOP_DEV=$(sudo losetup -f)
if [ -z "$ESP_LOOP_DEV" ] ; then
echo "No free loop device. Free up a loop device or reboot. exiting. "
exit 1
fi
mkdir -p "${ESP_DIR}"
sudo losetup "${ESP_LOOP_DEV}" "${ESP_IMG}"
sudo mount "${ESP_LOOP_DEV}" "${ESP_DIR}"
sudo mkdir -p "${ESP_DIR}/efi/boot"
sudo grub-mkimage -p /efi/boot -o "${ESP_DIR}/efi/boot/bootx64.efi" \
part_gpt fat ext2 normal boot sh chain configfile linux
sudo cp ${ROOT_FS_DIR}/boot/vmlinuz ${ESP_DIR}/efi/boot/vmlinuz
cat <<EOF | sudo dd of=${ESP_DIR}/efi/boot/grub.cfg
sudo cp "${ROOT_FS_DIR}/boot/vmlinuz" "${ESP_DIR}/efi/boot/vmlinuz"
cat <<EOF | sudo dd of="${ESP_DIR}/efi/boot/grub.cfg"
set timeout=2
set default=0
menuentry "32-bit serial" {
menuentry "serial debug" {
linux /efi/boot/vmlinuz earlyprintk=serial,ttyS0,115200 i915.modeset=0 console=ttyS0,115200 acpi=off init=/sbin/init boot=local rootwait root=/dev/sda3 ro noresume noswap loglevel=7
}
menuentry "normal" {
linux /efi/boot/vmlinuz quiet console=tty2 init=/sbin/init boot=local rootwait root=/dev/sda3 ro noresume noswap i915.modeset=1 loglevel=1
}
EOF
# Enable dev mode on the target system and re-run ldconfig