127 lines
3.5 KiB
Text
127 lines
3.5 KiB
Text
# Copyright 2012 Hewlett-Packard Development Company, L.P.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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function mk_build_dir () {
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export TMP_BUILD_DIR=$(mktemp -t -d image.XXXXXXXX)
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[ $? -eq 0 ] || die "Failed to create tmp directory"
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trap cleanup EXIT
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echo Building in $TMP_BUILD_DIR
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export TMP_IMAGE_PATH=$TMP_BUILD_DIR/image
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export TMP_HOOKS_PATH=$TMP_BUILD_DIR/hooks
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}
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function save_image () {
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# TODO: this really should rename the old file
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if [ -f $1 ] ; then
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echo "Old Image file Found REMOVING"
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rm -f $1
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fi
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cp $TMP_IMAGE_PATH $1
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rm -r $TMP_BUILD_DIR
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# All done!
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trap EXIT
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echo "Image file $1 created..."
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}
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function generate_hooks () {
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mkdir -p $TMP_HOOKS_PATH
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for _ELEMENT in $IMAGE_ELEMENT ; do
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[ -d $ELEMENTS_DIR/$_ELEMENT ] || die "Element $_ELEMENT does not exist." ;
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cp -t $TMP_HOOKS_PATH -a $ELEMENTS_DIR/$_ELEMENT/* ;
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done
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}
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# Call the supplied break-in routine if the named point is listed in the break
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# list.
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# $1 the break point.
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# $2.. what to call if a break is needed
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function check_break () {
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if echo "$break" | egrep -e "(,|^)$1(,|$)" -q; then
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echo "Starting debug shell. Exit to resume building." >&2
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echo At stage $1 >&2
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shift
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"$@"
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echo "Resuming" >&2
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fi
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}
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# Check that a real element has been chosen (prevents foot-guns)
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function check_element () {
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[ -d $TMP_HOOKS_PATH ] || generate_hooks
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}
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# Run a hook, looking for a regex in its stdout, and eval the matched lines.
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# $1 is the hook to run
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# $2 is the regex to look for
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function eval_run_d () {
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local TEMP=`run_d $1`
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echo "$TEMP"
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if [ `echo "$TEMP" | grep -s "$2"` ]; then
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TEMP=`echo "$TEMP" | grep "$2"`
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eval "$TEMP"
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fi
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}
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# Usage: map_nbd $image
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# Returns nbd device path
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function map_nbd {
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(lsmod | grep '^nbd ') || sudo modprobe nbd max_part=16
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if [[ $(qemu-nbd --help | grep cache) == *writeback* ]] ; then
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CACHE="--cache=writeback"
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else
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echo "Warning: qemu-nbd without --cache=writeback is /slow/."
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CACHE=""
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fi
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NBD_DEV=
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for i in `seq 0 15`; do
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if [ ! -e /sys/block/nbd$i/pid ]; then
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NBD_DEV=/dev/nbd$i
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# Connect to nbd and wait till it is ready
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sudo qemu-nbd -c $NBD_DEV $CACHE $1
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if ! timeout 60 sh -c "while ! [ -e /sys/block/nbd$i/pid ]; do sleep 1; done"; then
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echo "Couldn't connect $NBD_DEV"
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exit 1
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fi
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break
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fi
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done
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if [ -z "$NBD_DEV" ]; then
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echo "No free NBD slots"
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exit 1
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fi
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}
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# Delete and unmount the working dir used in extracting kernel/initrd
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function unmount_qcow_image () {
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sudo umount $WORK_DIR || true
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sudo qemu-nbd -d $NBD_DEV || true
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sudo rm -rf $WORK_DIR
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trap - SIGHUP SIGINT SIGTERM EXIT
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}
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function mount_qcow_image() {
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trap unmount_qcow_image SIGHUP SIGINT SIGTERM EXIT
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WORK_DIR=$(mktemp -d)
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map_nbd $1
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if [ -e "${NBD_DEV}p1" ]; then
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sudo mount ${NBD_DEV}p1 $WORK_DIR
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else
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sudo mount ${NBD_DEV} $WORK_DIR
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fi
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}
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