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Diffstat (limited to 'config.d/05diskimage_loopback.defconf')
| -rw-r--r-- | config.d/05diskimage_loopback.defconf | 237 |
1 files changed, 0 insertions, 237 deletions
diff --git a/config.d/05diskimage_loopback.defconf b/config.d/05diskimage_loopback.defconf deleted file mode 100644 index 2a261a0..0000000 --- a/config.d/05diskimage_loopback.defconf +++ /dev/null @@ -1,237 +0,0 @@ -# Hey Emacs, this is a -*- shell-script -*- !!! - -# This file provides functions and options to implement loopback -# mounting and access/update of disk images, either via qemu-nbd/nbd -# (for qcow2 images) or via loopback (for raw (or reflink) images). - -defconf QEMU_NBD "qemu-nbd" \ - "<cmd>" "qemu-nbd command to run - might be kvm-nbd on some systems" - -defconf NBD_DEVICE "/dev/nbd0" \ - "<dev>" "NBD device node to use" - -###################################################################### - -diskimage_mount_loopback () -{ - local disk="$1" - - local device extra_mount_options - - _setup_image "$disk" - - echo "Mounting disk ${disk}..." - local m o - for m in $SYSTEM_DISK_MOUNTS ; do - local mount_ok=0 - o="${m#*:}" # Offset is after colon - m="${m%:*}" # Mountpoint is before colon - echo " mount ${m} from offset ${o}" - local i - for i in $(seq 1 5); do - mount -o offset=${o}${extra_mount_options} $device "mnt${m}" && { - mount_ok=1 - break - } - umount mnt 2>/dev/null || true - sleep 1 - done - [ $mount_ok = 1 ] || die "Failed to mount $disk" - done - - [ -d "mnt/root" ] || { - echo "Mounted directory does not look like a root filesystem" - ls -latr mnt - exit 1 - } -} - -# unmount a qemu image -diskimage_unmount_loopback () -{ - echo "Unmounting disk" - sync; sync; - - # umounts are done in reverse. Be lazy and construct a reverse - # list, since the shell will handle any strange whitespace for - # us... ;-) - local umounts="" - local m - for m in $SYSTEM_DISK_MOUNTS ; do - umounts="${m%:*}${umounts:+ }${umounts}" - done - for m in $umounts ; do - echo " umount ${m}" - umount "mnt${m}" || umount "mnt${m}" || true - done - _cleanup_image -} - -diskimage_mkdir_p_loopback () -{ - mkdir -p "mnt$1" -} - -diskimage_substitute_vars_loopback () -{ - substitute_vars "$1" "mnt$2" -} - -diskimage_chmod_loopback () -{ - local mode="$1" ; shift - local i - for i ; do - # this should handle wildcards - eval chmod "$mode" "mnt$i" - done -} - -diskimage_chmod_reference_loopback () -{ - local ref="$1" ; shift - local i - for i ; do - # this should handle wildcards - eval chmod --reference="$ref" "mnt$i" - done -} - -diskimage_is_file_loopback () -{ - [ -f "mnt$1" ] -} - -diskimage_is_directory_loopback () -{ - [ -d "mnt$1" ] -} - -diskimage_append_text_file_loopback () -{ - cat "$1" >> "mnt$2" -} - -diskimage_append_text_loopback () -{ - echo "$1" >> "mnt$2" -} - -diskimage_sed_loopback () -{ - local file="$1" ; shift - sed -i.org "$@" "mnt$file" -} - -diskimage_grep_loopback () -{ - local file="$1" ; shift - grep "$@" "mnt$file" -} - -diskimage_put_loopback () -{ - if [ "$1" = "-" ] ; then - cat >"mnt$2" - else - cp "$1" "mnt$2" - fi -} - -diskimage_ln_s_loopback () -{ - ln -s "$1" "mnt$2" -} - -diskimage_command_loopback () -{ - chroot mnt "$@" -} - -diskimage_mv_loopback () -{ - mv "mnt$1" "mnt$2" -} - -diskimage_rm_rf_loopback () -{ - rm -rf "mnt$1" -} - -###################################################################### - -diskimage_loopback_sanity_check () -{ - if [ "$SYSTEM_DISK_FORMAT" = "qcow2" -a \ - "$SYSTEM_DISK_ACCESS_METHOD" = "loopback" ] ; then - check_command $QEMU_NBD - check_command nbd-client - fi -} - -register_hook post_config_hooks diskimage_loopback_sanity_check - -###################################################################### - -# Private functions - -# mount a qemu image via nbd -_connect_nbd() { - echo "Connecting nbd to $1" - mkdir -p mnt - modprobe nbd - killall -9 -q $QEMU_NBD || true - $QEMU_NBD -p 1300 $1 & - sleep 1 - [ -r $NBD_DEVICE ] || { - mknod $NBD_DEVICE b 43 0 - } - umount mnt 2> /dev/null || true - nbd-client -d $NBD_DEVICE > /dev/null 2>&1 || true - killall -9 -q nbd-client || true - nbd-client localhost 1300 $NBD_DEVICE > /dev/null 2>&1 || true & - sleep 1 -} - -# disconnect nbd -_disconnect_nbd() { - echo "Disconnecting nbd" - sync; sync - nbd-client -d $NBD_DEVICE > /dev/null 2>&1 || true - killall -9 -q nbd-client || true - killall -q $QEMU_NBD || true -} - -_setup_image () -{ - local disk="$1" - - case "$SYSTEM_DISK_FORMAT" in - qcow2) - _connect_nbd "$disk" - device=$NBD_DEVICE - extra_mount_options="" - ;; - raw|reflink) - device="$disk" - extra_mount_options=",loop" - ;; - *) - die "Error: unknown SYSTEM_DISK_FORMAT=${SYSTEM_DISK_FORMAT}." - esac -} - -_cleanup_image () -{ - case "$SYSTEM_DISK_FORMAT" in - qcow2) - _disconnect_nbd - ;; - raw|reflink) - : - ;; - *) - die "Error: unknown SYSTEM_DISK_FORMAT=${SYSTEM_DISK_FORMAT}." - esac -} - |