#!/bin/bash # Copyright 2012 Hewlett-Packard Development Company, L.P. # All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. function tmpfs_check() { local echo_message=${1:-1} [ "$DIB_NO_TMPFS" == "0" ] || return 1 [ -r /proc/meminfo ] || return 1 total_kB=$(awk '/^MemTotal/ { print $2 }' /proc/meminfo) # tmpfs uses by default 50% of the available RAM, so the RAM should be at least # the double of the minimum tmpfs size required RAM_NEEDED=$(($DIB_MIN_TMPFS * 2)) [ $total_kB -lt $(($RAM_NEEDED*1024*1024)) ] || return 0 if [ $echo_message == '1' ]; then echo "WARNING: Not enough RAM to use tmpfs for build. Using ${TMP_DIR:-/tmp}. ($total_kB < ${RAM_NEEDED}G)" fi return 1 } function mk_build_dir () { TMP_BUILD_DIR=$(mktemp -t -d --tmpdir=${TMP_DIR:-/tmp} dib_build.XXXXXXXX) TMP_IMAGE_DIR=$(mktemp -t -d --tmpdir=${TMP_DIR:-/tmp} dib_image.XXXXXXXX) [ $? -eq 0 ] || die "Failed to create tmp directory" export TMP_BUILD_DIR if tmpfs_check ; then sudo mount -t tmpfs tmpfs $TMP_BUILD_DIR sudo mount -t tmpfs tmpfs $TMP_IMAGE_DIR sudo chown $(id -u):$(id -g) $TMP_BUILD_DIR $TMP_IMAGE_DIR fi trap trap_cleanup EXIT echo Building in $TMP_BUILD_DIR export TMP_IMAGE_PATH=$TMP_IMAGE_DIR/image.raw export OUT_IMAGE_PATH=$TMP_IMAGE_PATH export TMP_HOOKS_PATH=$TMP_BUILD_DIR/hooks } function finish_image () { if [ -f $1 -a ${OVERWRITE_OLD_IMAGE:-0} -eq 0 ]; then old_image="${1%.*}"-$(date +%Y.%m.%d-%H.%M.%S).${1##*.} echo "Old image found. Renaming it to $old_image" mv "$1" "$old_image" if [ -f "$1.md5" ]; then mv "$1.md5" "$old_image.md5" fi if [ -f "$1.sha256" ]; then mv "$1.sha256" "$old_image.sha256" fi fi mv $OUT_IMAGE_PATH $1 if [ "$DIB_CHECKSUM" == "1" ]; then # NOTE(pabelanger): Read image into memory once and generate both checksum # files. md5sum $1 > $1.md5 & sha256sum $1 > $1.sha256 & wait fi echo "Image file $1 created..." } function save_image () { finish_image $1 } function copy_hooks_not_overwrite () { _DIR=$(basename $1) test -d $TMP_HOOKS_PATH/$_DIR || mkdir $TMP_HOOKS_PATH/$_DIR for _HOOK in $(ls $1); do if [ ! -f $TMP_HOOKS_PATH/$_DIR/$_HOOK ]; then cp -t $TMP_HOOKS_PATH/$_DIR -a $1/$_HOOK else echo "There is a duplicated hook in your elements: $_ELEMENT/$_DIR/$_HOOK" exit 1 fi done } function generate_hooks () { mkdir -p $TMP_HOOKS_PATH for _ELEMENT in $IMAGE_ELEMENT ; do for dir in ${ELEMENTS_PATH//:/ } ; do [ -d $dir/$_ELEMENT ] || continue for _DIR in $(find $dir/$_ELEMENT -follow -mindepth 1 -maxdepth 1 -type d -not -name tests); do copy_hooks_not_overwrite $_DIR done for _FILE in $(find $dir/$_ELEMENT -follow -maxdepth 1 -type f); do cp -t $TMP_HOOKS_PATH -a $_FILE done break done done } # Call the supplied break-in routine if the named point is listed in the break # list. # $1 the break point. # $2.. what to call if a break is needed function check_break () { if echo "${break:-}" | egrep -e "(,|^)$1(,|$)" -q; then echo "Starting debug shell. Exit to resume building." >&2 echo At stage $1 >&2 shift "$@" echo "Resuming" >&2 fi } # Check that a real element has been chosen (prevents foot-guns) function check_element () { [ -d $TMP_HOOKS_PATH ] || generate_hooks } # Run a hook, looking for a regex in its stdout, and eval the matched lines. # $1 is the hook to run # $2 is the regex to look for function eval_run_d () { local run_output=$(mktemp) trap "rm -f $run_output; check_break after-error ${break_cmd:-bash}" ERR run_d $1 $run_output if grep -q "$2" $run_output; then local temp=$(grep "$2" $run_output) eval "$temp" fi rm $run_output trap - ERR } # Get any process that appears to be running in $TMP_BUILD_DIR function _get_chroot_processes () { # Deselect kernel threads, and use a python script to avoid # forking lots and lots of readlink / grep processes on a busy # system. ps --ppid 2 -p 2 --deselect -o pid= | xargs python -c ' import os import sys for pid in sys.argv[2:]: try: root = os.readlink("/proc/%s/root" % pid) except: continue if sys.argv[1] in root: print("%s" % pid) ' $TMP_BUILD_DIR } function kill_chroot_processes () { local xtrace xtrace=$(set +o | grep xtrace) set +o xtrace local pidname if [ -z "${1}" ]; then echo "ERROR: no chroot directory specified" exit 1 fi for pid in $(_get_chroot_processes); do # If there are open files from the chroot, just kill the process using # these files. This is racy, but good enough pidname=$(cat $piddir/comm 2>/dev/null || echo "unknown") echo "Killing chroot process: '${pidname}($pid)'" sudo kill $pid done $xtrace } function cleanup_build_dir () { if ! timeout 5 sh -c " while ! sudo rm -rf $TMP_BUILD_DIR/built; do sleep 1; done"; then echo "ERROR: unable to cleanly remove $TMP_BUILD_DIR/built" exit 1 fi sudo rm -rf $TMP_BUILD_DIR/mnt kill_chroot_processes $TMP_BUILD_DIR if tmpfs_check 0; then # If kill_chroot_processes did not succeed then we have to wait for # init to reap the orphaned chroot processes if ! timeout 120 sh -c "while ! sudo umount -f $TMP_BUILD_DIR; do sleep 1; done"; then echo "ERROR: failed to umount the $TMP_BUILD_DIR tmpfs mount point" exit 1 fi fi rm -rf --one-file-system $TMP_BUILD_DIR } function cleanup_image_dir () { kill_chroot_processes $TMP_IMAGE_DIR if tmpfs_check 0; then if ! timeout 120 sh -c "while ! sudo umount -f $TMP_IMAGE_DIR; do sleep 1; done"; then echo "ERROR: failed to umount the $TMP_IMAGE_DIR tmpfs mount point" exit 1 fi fi rm -rf --one-file-system $TMP_IMAGE_DIR } # Run a directory of hooks outside the target (that is, no chrooting). function run_d() { check_element check_break before-$1 ${break_cmd:-bash} if [ -d ${TMP_HOOKS_PATH}/$1.d ] ; then if [ -n "$2" ]; then dib-run-parts ${TMP_HOOKS_PATH}/$1.d | tee $2 if [[ ${PIPESTATUS[0]} != 0 ]]; then return 1 fi else dib-run-parts ${TMP_HOOKS_PATH}/$1.d fi fi check_break after-$1 bash } function detach_loopback() { local loopdev=$1 # Remove the map if it exists # If setup on a rhel or derivative the map was created with kpartx not losetup # and subsequently needs to be removed. loopdev_name=$(echo $loopdev | sed 's/\/dev\///g') if sudo dmsetup ls | grep $loopdev_name; then mapper_name=$(sudo dmsetup ls | grep $loopdev_name | awk '{ print $1 }') sudo dmsetup --noudevsync remove $mapper_name fi # loopback dev may be tied up a bit by udev events triggered by partition events for try in $(seq 10 -1 1) ; do if ! sudo losetup $loopdev || sudo losetup -d $loopdev ; then return 0 fi echo $loopdev may be busy, sleeping up to $try more seconds... sleep 1 done echo Gave up trying to detach $loopdev return 1 } function arg_to_elements() { for arg do IMAGE_ELEMENT="$IMAGE_ELEMENT $arg" ; done if [ "$SKIP_BASE" != "1" ]; then IMAGE_ELEMENT="base $IMAGE_ELEMENT" fi if [ "$IS_RAMDISK" == "1" ]; then IMAGE_ELEMENT="$RAMDISK_ELEMENT $IMAGE_ELEMENT" fi echo "Building elements: $IMAGE_ELEMENT" IMAGE_ELEMENT=$($SCRIPT_HOME/element-info $IMAGE_ELEMENT) export IMAGE_ELEMENT echo "Expanded element dependencies to: $IMAGE_ELEMENT" } function create_base () { mkdir $TMP_BUILD_DIR/mnt export TMP_MOUNT_PATH=$TMP_BUILD_DIR/mnt # Copy data in to the root. TARGET_ROOT=$TMP_MOUNT_PATH run_d root if [ -z "$(ls $TMP_MOUNT_PATH | grep -v '^lost+found\|tmp$')" ] ; then # No root element copied in. Note the test above allows # root.d elements to put things in /tmp echo "Failed to deploy the root element." exit 1 fi # Configure Image # Setup resolv.conf so we can chroot to install some packages if [ -L $TMP_MOUNT_PATH/etc/resolv.conf ] || [ -f $TMP_MOUNT_PATH/etc/resolv.conf ] ; then sudo mv $TMP_MOUNT_PATH/etc/resolv.conf $TMP_MOUNT_PATH/etc/resolv.conf.ORIG fi # Recreate resolv.conf sudo touch $TMP_MOUNT_PATH/etc/resolv.conf sudo chmod 777 $TMP_MOUNT_PATH/etc/resolv.conf # use system configured resolv.conf if available to support internal proxy resolving if [ -e /etc/resolv.conf ]; then cat /etc/resolv.conf > $TMP_MOUNT_PATH/etc/resolv.conf else echo nameserver 8.8.8.8 > $TMP_MOUNT_PATH/etc/resolv.conf fi mount_proc_dev_sys } function mount_proc_dev_sys () { # supporting kernel file systems sudo mount -t proc none $TMP_MOUNT_PATH/proc sudo mount --bind /dev $TMP_MOUNT_PATH/dev sudo mount --bind /dev/pts $TMP_MOUNT_PATH/dev/pts sudo mount -t sysfs none $TMP_MOUNT_PATH/sys } # Recursively unmount directories under a given directory DIR # usage: # unmount_dir DIR function unmount_dir { local dir="$1" local real_dir local mnts if [ ! -d $dir ]; then echo "*** $dir is not a directory" return 1 fi # get rid of any symlink elements in the incoming path, because # /proc/mounts is the real path real_dir=$(readlink -e $dir) mnts=$(awk '{print $2}' < /proc/mounts | grep "^$real_dir" | sort -r) for m in $mnts; do echo "Unmount $m" sudo umount -fl $m || true done }