diskimage-builder/diskimage_builder/lib/common-functions
Michael Johnson 8b08d212c3 Fix DIB scripts python version
Now that DIB is python3 only we can remove a hack that made sure
scripts outside the chroot ran with the correct version of python.
This is necessary as python3 does not resolve symbolic links to the
binary like python2.x did, which causes element scripts to fail finding
modules when DIB was run from inside a venv.

This patch does the following:
1. Reverts 9c7b8d1714 which was the
   workaround for mixed python2/3 environments.
2. Updates the scripts to use "python3" instead of "python".

Change-Id: If2402bb02fc8a4778fa9434fa167ea1fafd87c28
2020-07-07 12:53:51 -07:00

537 lines
17 KiB
Bash

#!/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.
# This is the "internal" verison of dib-run-parts. If you modify
# this, be aware that it needs to run both inside and outside the
# chroot environment, so it needs to be very generic.
DIB_RUN_PARTS=${_LIB}/dib-run-parts
function tmpfs_check() {
local echo_message=${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 $TMP_BUILD_DIR
export TMP_IMAGE_DIR
export OUT_IMAGE_PATH=$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.
# NOTE(ianw): we've seen issues with this waiting for
# our outfilter.py wrapper when containerised (probably due to
# no tty). Waiting for just these processes is a bit of hacky
# workaround ...
declare -a wait_for
md5sum $1 > $1.md5 & wait_for+=($!)
sha256sum $1 > $1.sha256 & wait_for+=($!)
wait "${wait_for[@]}"
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
echo "Copying hooks $1/$_HOOK"
cp -t $TMP_HOOKS_PATH/$_DIR -a $1/$_HOOK
else
echo "There is a duplicated hook in your elements: $_ELEMENT/$_DIR/$_HOOK"
exit 1
fi
done
}
function generate_hooks () {
local xtrace
xtrace=$(set +o | grep xtrace)
set +o xtrace
local dir
local file
eval declare -A image_elements=($(get_image_element_array))
mkdir -p $TMP_HOOKS_PATH
for i in "${!image_elements[@]}"; do
local element=$i
local element_dir=${image_elements[$i]}
echo "Copying hooks for ${element}"
for dir in $(find $element_dir \
-follow -mindepth 1 -maxdepth 1 \
-type d \
-not -name tests \
-not -name __pycache__); do
copy_hooks_not_overwrite $dir
done
for file in $(find $element_dir \
-follow -maxdepth 1 \
-type f \
-not -name '*.pyc'); do
cp -t $TMP_HOOKS_PATH -a $file
done
done
$xtrace
}
# 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 ${DIB_PYTHON_EXEC:-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 10 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
echo "Running hooks from ${TMP_HOOKS_PATH}/$1.d"
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-$1 bash
}
function _arg_defaults_hack() {
# The block-device configuration looks in all elements for a
# "block-device-default.yaml" file. The "vm" element used to
# provide the default block-device, which was fine when there was
# only one option; but now we have mbr, gpt & efi versions.
#
# So now the vm element has a dependency on the block-device
# element, which several different elements can provide. However,
# for backwards compatability we need to ensure you can still
# build without specifying it. Thus if we see the vm element, but
# no block-device-* element, we will automatically add the old
# default MBR.
#
# Note that you can still override this by setting
# DIB_BLOCK_DEVICE_CONFIG; any value there will be taken over the
# element defaults. In this case you'd have "block-device-mbr" as
# an element, but it wouldn't actually be used for configuration.
#
# XXX: if this is becoming a common problem, we could have some
# sort of "element-defaults" that maps a "element-deps" entry to a
# default.
local vm_seen
local blockdev_seen
local elements
for arg do
if [[ "$arg" =~ "vm" ]]; then
vm_seen=1
elif [[ "$arg" =~ "block-device-" ]]; then
blockdev_seen=1
fi
elements="$elements $arg"
done
if [[ -n "${vm_seen}" && -z "${blockdev_seen}" ]]; then
if [[ "arm64 aarch64" =~ $ARCH ]] ; then
elements="$elements block-device-efi"
else
elements="$elements block-device-mbr"
fi
fi
echo $elements
}
function arg_to_elements() {
for arg do IMAGE_ELEMENT="$IMAGE_ELEMENT $arg" ; done
IMAGE_ELEMENT="$(_arg_defaults_hack $IMAGE_ELEMENT)"
if [ "$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: $IMAGE_ELEMENT"
export IMAGE_ELEMENT
# element-info will output bash code to create
# * IMAGE_ELEMENT
# legacy list of elements
#
# * IMAGE_ELEMENT_YAML
# YAML dictionary with key=element, value=path
#
# import os
# import yaml
# yaml.load(os.getenv('IMAGE_ELEMENT_YAML')
#
# * function get_image_element_array
# Function to create Bash associative-array. Since bash can not
# export array variables, we provide a function to populate the
# variables.
#
# # we need the eval, it expands the string for the array create
# eval declare -A image_elements=($(get_image_element_array))
# for i in ${!image_elements[@]}; do
# element=$i
# path=${image_elements[$i]
# done
elinfo_out="$(element-info --env $IMAGE_ELEMENT)"
if [ $? -ne 0 ]; then
echo "ERROR: element-info failed to expand elements."
exit 1
fi
eval "$elinfo_out"
echo "Expanded element dependencies to: $IMAGE_ELEMENT"
}
function create_base () {
mkdir $TMP_BUILD_DIR/mnt
# Make sure the / inside the chroot is owned by root
# If it is not owned by root, some Ubuntu bionic packages will fail
# path validation at install time.
sudo chown root.root $TMP_BUILD_DIR/mnt
export TMP_MOUNT_PATH=$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
# Save resolv.conf as created by the initial install. Note the
# .ORIG file is an exported interface -- it may be modified and we
# will copy it back in during finalisation of the image.
# Note that we use -L and -f to test here as test (and bash [[)
# return false with -e if the link target does not exist.
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
}
# Get mount options for mounting /dev/pts
# Kernel commit https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eedf265aa003b4781de24cfed40a655a664457e6
# introduced in v4.7 allows multiple instances of devpts. However,
# some distributions are running older kernels so we need to take
# care on what options we use to mount a new instance of devpts
# filesystem since it's not completely independent. The best thing
# to do is to simply use the existing mount options.
function mount_dev_pts_options() {
echo "-o $(findmnt --first-only /dev/pts --noheadings --output OPTIONS)"
}
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 -t devpts $(mount_dev_pts_options) devpts $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
local split_mounts
local found_mountpoint
if [ ! -d $dir ]; then
echo "*** $dir is not a directory"
return 0
fi
# get rid of any symlink elements in the incoming path, because
# /proc/mounts is the real path
real_dir=$(readlink -e $dir)
# populate the exported mountpoints
IFS='|' read -ra split_mounts <<< "$DIB_MOUNTPOINTS"
# note the "/" on real_dir ... we are just looking for things
# mounted *underneath* this directory.
mnts=$(awk '{print $2}' < /proc/mounts | grep "^$real_dir/" | sort -r)
for m in $mnts; do
# check if suffix is in array
found_mountpoint=false
for mountpoint in "${split_mounts[@]}"; do
if [[ "$mountpoint" != "/" ]]; then
if [[ "$m" == *$mountpoint ]]; then
echo "Mountpoint $m managed by block device; skipping"
found_mountpoint=true
break
fi
fi
done
if [ $found_mountpoint == false ]; then
# unmount the directory as it is not managed by block device
echo "Unmount $m"
sudo umount -fl $m || true
fi
done
}
# Create YAML config file for the block device layer
# The order here is: use the one the user provides - if there is
# none provided, fall back to the possible one element which
# defines a fallback configuration.
# Parameters:
# - name of the to be created config file
function block_device_create_config_file {
# nosiy; we manually trace
local xtrace
xtrace=$(set +o | grep xtrace)
set +o xtrace
local config_yaml="$1"
if [[ ${DIB_BLOCK_DEVICE_CONFIG:-} == file://* ]]; then
cp $(echo ${DIB_BLOCK_DEVICE_CONFIG} | cut -c 8-) ${config_yaml}
echo "Using file-based block-device config: ${DIB_BLOCK_DEVICE_CONFIG}"
$xtrace
return
fi
if [ -n "${DIB_BLOCK_DEVICE_CONFIG:-}" ]; then
printf "%s" "${DIB_BLOCK_DEVICE_CONFIG}" >${config_yaml}
echo "User specified block-device config from DIB_BLOCK_DEVICE_CONFIG"
$xtrace
return
fi
# Search the elements for a matching block-device config.
# XXX: first match wins?
echo "Searching elements for block-device[-${ARCH}].yaml ..."
eval declare -A image_elements=($(get_image_element_array))
for i in ${!image_elements[@]}; do
local cfg
# look for arch specific version first, then default
if [[ "ppc64le ppc64el" =~ $ARCH ]] ; then
# NOTE(tonyb): ppc64el and ppc64le are the same archttechture, it's
# just different distro's have different names. So if we're either
# of them pick the block-device-ppc64el.yaml file
cfg=${image_elements[$i]}/block-device-ppc64el.yaml
else
cfg=${image_elements[$i]}/block-device-${ARCH}.yaml
fi
if [ -e ${cfg} ]; then
cp ${cfg} ${config_yaml}
echo "Using block-device config: ${cfg}"
$xtrace
return
else
cfg=${image_elements[$i]}/block-device-default.yaml
if [ -e ${cfg} ]; then
cp ${cfg} ${config_yaml}
echo "Using block-device config: ${cfg}"
$xtrace
return
fi
fi
done
echo "... done"
# how did this get here?
if [ -e ${config_yaml} ]; then
die "${config_yaml} exists?"
fi
echo "Using default block-device fallback config"
# If no config is there (until now) use the default config
cat >${config_yaml} <<EOF
- local_loop:
name: image0
mkfs:
name: mkfs_root
mount:
mount_point: /
fstab:
options: "defaults"
fsck-passno: 1
EOF
$xtrace
}