mirror of
https://git.proxmox.com/git/mirror_lxc
synced 2025-07-27 09:48:32 +00:00
lxc-oci: make shellcheck clean
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner
parent
a488502d83
commit
4328e9e316
@ -21,17 +21,16 @@
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# USA
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set -eu
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# set -x # debug
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# Make sure the usual locations are in PATH
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export PATH=$PATH:/usr/sbin:/usr/bin:/sbin:/bin
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# Check for required binaries
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for bin in skopeo umoci jq; do
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if ! type $bin >/dev/null 2>&1; then
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echo "ERROR: Missing required tool: $bin" 1>&2
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exit 1
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fi
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if ! which $bin >/dev/null 2>&1; then
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echo "ERROR: Missing required tool: $bin" 1>&2
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exit 1
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fi
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done
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LOCALSTATEDIR="@LOCALSTATEDIR@"
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@ -40,86 +39,94 @@ LXC_HOOK_DIR="@LXCHOOKDIR@"
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# Some useful functions
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cleanup() {
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if [ -d "${DOWNLOAD_TEMP}" ]; then
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rm -Rf "${DOWNLOAD_TEMP}"
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fi
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if [ -d "${LXC_ROOTFS}.tmp" ]; then
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rm -Rf "${LXC_ROOTFS}.tmp"
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fi
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if [ -d "${DOWNLOAD_TEMP}" ]; then
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rm -Rf "${DOWNLOAD_TEMP}"
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fi
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if [ -d "${LXC_ROOTFS}.tmp" ]; then
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rm -Rf "${LXC_ROOTFS}.tmp"
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fi
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}
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in_userns() {
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[ -e /proc/self/uid_map ] || { echo no; return; }
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while read line; do
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fields=$(echo $line | awk '{ print $1 " " $2 " " $3 }')
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[ "$fields" = "0 0 4294967295" ] && { echo no; return; } || true
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echo $fields | grep -q " 0 1$" && { echo userns-root; return; } || true
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done < /proc/self/uid_map
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[ -e /proc/self/uid_map ] || { echo no; return; }
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while read -r line; do
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fields="$(echo "$line" | awk '{ print $1 " " $2 " " $3 }')"
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if [ "${fields}" = "0 0 4294967295" ]; then
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echo no;
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return;
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fi
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if echo "${fields}" | grep -q " 0 1$"; then
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echo userns-root;
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return;
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fi
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done < /proc/self/uid_map
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[ "$(cat /proc/self/uid_map)" = "$(cat /proc/1/uid_map)" ] && \
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{ echo userns-root; return; }
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echo yes
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[ "$(cat /proc/self/uid_map)" = "$(cat /proc/1/uid_map)" ] && { echo userns-root; return; }
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echo yes
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}
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getconfigpath() {
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basedir="$1"
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q="$2"
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basedir="$1"
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q="$2"
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digest=`cat "${basedir}/index.json" | jq -c -r --arg q "$q" '.manifests[] | if .annotations."org.opencontainers.image.ref.name" == $q then .digest else empty end'`
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if [ -z "${digest}" ]; then
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echo "$q not found in index.json" >&2
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return
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fi
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digest=$(jq -c -r --arg q "$q" '.manifests[] | if .annotations."org.opencontainers.image.ref.name" == $q then .digest else empty end' < "${basedir}/index.json")
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if [ -z "${digest}" ]; then
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echo "$q not found in index.json" >&2
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return
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fi
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# Ok we have the image config digest, now get the config from that,
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d=${digest:7}
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cdigest=`cat "${basedir}/blobs/sha256/${d}" | jq -c -r '.config.digest'`
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if [ -z "${cdigest}" ]; then
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echo "container config not found" >&2
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return
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fi
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# Ok we have the image config digest, now get the config from that
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# shellcheck disable=SC2039
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d=${digest:7}
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cdigest=$(jq -c -r '.config.digest' < "${basedir}/blobs/sha256/${d}")
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if [ -z "${cdigest}" ]; then
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echo "container config not found" >&2
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return
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fi
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d2=${cdigest:7}
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echo "${basedir}/blobs/sha256/${d2}"
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return
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# shellcheck disable=SC2039
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d2=${cdigest:7}
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echo "${basedir}/blobs/sha256/${d2}"
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return
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}
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# get entrypoint from oci image. Use sh if unspecified
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# Get entrypoint from oci image. Use sh if unspecified
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getep() {
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if [ "$#" -eq 0 ]; then
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echo "/bin/sh"
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return
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fi
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if [ "$#" -eq 0 ]; then
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echo "/bin/sh"
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return
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fi
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configpath="$1"
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configpath="$1"
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ep=`cat "${configpath}" | jq -c -r '.config.Entrypoint[]?'`
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cmd=`cat "${configpath}" | jq -c -r '.config.Cmd[]?'`
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if [ -z "${ep}" ]; then
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ep="${cmd}"
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if [ -z "${ep}" ]; then
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ep="/bin/sh"
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fi
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elif [ -n "${cmd}" ]; then
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ep="${ep} ${cmd}"
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fi
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ep=$(jq -c -r '.config.Entrypoint[]?'< "${configpath}")
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cmd=$(jq -c -r '.config.Cmd[]?' < "${configpath}")
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if [ -z "${ep}" ]; then
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ep="${cmd}"
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if [ -z "${ep}" ]; then
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ep="/bin/sh"
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fi
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elif [ -n "${cmd}" ]; then
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ep="${ep} ${cmd}"
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fi
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echo ${ep}
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return
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echo "${ep}"
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return
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}
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# get environment from oci image.
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getenv() {
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if [ "$#" -eq 0 ]; then
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return
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fi
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if [ "$#" -eq 0 ]; then
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return
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fi
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configpath="$1"
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configpath="$1"
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env=`cat "${configpath}" | jq -c -r '.config.Env[]'`
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env=$(jq -c -r '.config.Env[]'< "${configpath}")
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echo "${env}"
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return
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echo "${env}"
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return
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}
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# FIXME 1: only support numerical values in the configuration file.
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@ -127,37 +134,38 @@ getenv() {
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# the default group and supplementary groups of the given user/uid in
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# /etc/passwd from the container are applied."
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getuidgid() {
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if [ "$#" -eq 0 ]; then
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echo "0 0"
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return
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fi
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if [ "$#" -eq 0 ]; then
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echo "0 0"
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return
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fi
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configpath="$1"
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configpath="$1"
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uidgid=`cat "${configpath}" | jq -c -r '.config.User // "0:0"'`
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uidgid=(${uidgid//:/ })
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uidgid=$(jq -c -r '.config.User // "0:0"' < "${configpath}")
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# shellcheck disable=SC2039
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uidgid=(${uidgid//:/ })
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printf '%d %d' ${uidgid[0]:-0} ${uidgid[1]:-0} 2>/dev/null || true
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return
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printf '%d %d' "${uidgid[0]:-0}" "${uidgid[1]:-0}" 2>/dev/null || true
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return
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}
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# get cwd from oci image.
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getcwd() {
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if [ "$#" -eq 0 ]; then
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echo "/"
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return
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fi
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if [ "$#" -eq 0 ]; then
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echo "/"
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return
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fi
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configpath="$1"
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configpath="$1"
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cwd=`cat "${configpath}" | jq -c -r '.config.WorkingDir // "/"'`
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cwd=$(jq -c -r '.config.WorkingDir // "/"' < "${configpath}")
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echo "${cwd}"
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return
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echo "${cwd}"
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return
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}
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usage() {
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cat <<EOF
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cat <<EOF
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LXC container template for OCI images
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Special arguments:
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@ -176,15 +184,11 @@ LXC internal arguments (do not pass manually!):
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[ --rootfs <rootfs> ]: The path to the container's rootfs
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[ --mapped-uid <map> ]: A uid map (user namespaces)
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[ --mapped-gid <map> ]: A gid map (user namespaces)
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EOF
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return 0
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return 0
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}
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options=$(getopt -o u:h -l help,url:,username:,password:,no-cache,dhcp,\
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name:,path:,rootfs:,mapped-uid:,mapped-gid: -- "$@")
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if [ $? -ne 0 ]; then
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if ! options=$(getopt -o u:h -l help,url:,username:,password:,no-cache,dhcp,name:,path:,rootfs:,mapped-uid:,mapped-gid: -- "$@"); then
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usage
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exit 1
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fi
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@ -203,136 +207,152 @@ LXC_PATH=
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LXC_ROOTFS=
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while :; do
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case "$1" in
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-h|--help) usage && exit 1;;
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-u|--url) OCI_URL=$2; shift 2;;
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--username) OCI_USERNAME=$2; shift 2;;
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--password) OCI_PASSWORD=$2; shift 2;;
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--no-cache) OCI_USE_CACHE="false"; shift 1;;
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--dhcp) OCI_USE_DHCP="true"; shift 1;;
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--name) LXC_NAME=$2; shift 2;;
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--path) LXC_PATH=$2; shift 2;;
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--rootfs) LXC_ROOTFS=$2; shift 2;;
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--mapped-uid) LXC_MAPPED_UID=$2; shift 2;;
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--mapped-gid) LXC_MAPPED_GID=$2; shift 2;;
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*) break;;
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esac
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case "$1" in
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-h|--help) usage && exit 1;;
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-u|--url) OCI_URL=$2; shift 2;;
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--username) OCI_USERNAME=$2; shift 2;;
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--password) OCI_PASSWORD=$2; shift 2;;
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--no-cache) OCI_USE_CACHE="false"; shift 1;;
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--dhcp) OCI_USE_DHCP="true"; shift 1;;
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--name) LXC_NAME=$2; shift 2;;
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--path) LXC_PATH=$2; shift 2;;
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--rootfs) LXC_ROOTFS=$2; shift 2;;
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--mapped-uid) LXC_MAPPED_UID=$2; shift 2;;
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--mapped-gid) LXC_MAPPED_GID=$2; shift 2;;
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*) break;;
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esac
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done
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# Check that we have all variables we need
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if [ -z "$LXC_NAME" ] || [ -z "$LXC_PATH" ] || [ -z "$LXC_ROOTFS" ]; then
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echo "ERROR: Not running through LXC." 1>&2
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exit 1
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echo "ERROR: Not running through LXC" 1>&2
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exit 1
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fi
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if [ -z "$OCI_URL" ]; then
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echo "ERROR: no OCI URL given"
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exit 1
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echo "ERROR: no OCI URL given"
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exit 1
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fi
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if [ -n "$OCI_PASSWORD" ] && [ -z "$OCI_USERNAME" ]; then
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echo "ERROR: password given but no username specified"
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exit 1
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echo "ERROR: password given but no username specified"
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exit 1
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fi
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if [ "${OCI_USE_CACHE}" = "true" ]; then
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if ! skopeo copy --help | grep -q 'dest-shared-blob-dir'; then
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echo "INFO: skopeo doesn't support blob caching"
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OCI_USE_CACHE="false"
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fi
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if ! skopeo copy --help | grep -q 'dest-shared-blob-dir'; then
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echo "INFO: skopeo doesn't support blob caching"
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OCI_USE_CACHE="false"
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fi
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fi
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USERNS=$(in_userns)
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if [ "$USERNS" = "yes" ]; then
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if [ -z "$LXC_MAPPED_UID" ] || [ "$LXC_MAPPED_UID" = "-1" ]; then
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echo "ERROR: In a user namespace without a map." 1>&2
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exit 1
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fi
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if [ -z "$LXC_MAPPED_UID" ] || [ "$LXC_MAPPED_UID" = "-1" ]; then
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echo "ERROR: In a user namespace without a map" 1>&2
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exit 1
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fi
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fi
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if [ "${OCI_USE_CACHE}" = "true" ]; then
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if [ "$USERNS" = "yes" ]; then
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DOWNLOAD_BASE="${HOME}/.cache/lxc"
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else
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DOWNLOAD_BASE="${LOCALSTATEDIR}/cache/lxc"
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fi
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if [ "$USERNS" = "yes" ]; then
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DOWNLOAD_BASE="${HOME}/.cache/lxc"
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else
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DOWNLOAD_BASE="${LOCALSTATEDIR}/cache/lxc"
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fi
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else
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DOWNLOAD_BASE=/tmp
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DOWNLOAD_BASE=/tmp
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fi
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# Trap all exit signals
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trap cleanup EXIT HUP INT TERM
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if ! type mktemp >/dev/null 2>&1; then
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DOWNLOAD_TEMP="${DOWNLOAD_BASE}/lxc-oci.$$"
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mkdir -p $DOWNLOAD_TEMP
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if ! which mktemp >/dev/null 2>&1; then
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DOWNLOAD_TEMP="${DOWNLOAD_BASE}/lxc-oci.$$"
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mkdir -p "${DOWNLOAD_TEMP}"
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else
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DOWNLOAD_TEMP=$(mktemp -d -p "${DOWNLOAD_BASE}")
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DOWNLOAD_TEMP=$(mktemp -d -p "${DOWNLOAD_BASE}")
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fi
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# Download the image
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# shellcheck disable=SC2039
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skopeo_args=("")
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if [ -n "$OCI_USERNAME" ]; then
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CREDENTIALS="${OCI_USERNAME}"
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if [ -n "$OCI_PASSWORD" ]; then
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CREDENTIALS="${CREDENTIALS}:${OCI_PASSWORD}"
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fi
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skopeo_args+=(--src-creds "${CREDENTIALS}")
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CREDENTIALS="${OCI_USERNAME}"
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if [ -n "$OCI_PASSWORD" ]; then
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CREDENTIALS="${CREDENTIALS}:${OCI_PASSWORD}"
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fi
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# shellcheck disable=SC2039
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skopeo_args+=(--src-creds "${CREDENTIALS}")
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fi
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if [ "${OCI_USE_CACHE}" = "true" ]; then
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skopeo_args+=(--dest-shared-blob-dir "${DOWNLOAD_BASE}")
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skopeo copy ${skopeo_args[@]} "${OCI_URL}" "oci:${DOWNLOAD_TEMP}:latest"
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ln -s "${DOWNLOAD_BASE}/sha256" "${DOWNLOAD_TEMP}/blobs/sha256"
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# shellcheck disable=SC2039
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# shellcheck disable=SC2068
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skopeo_args+=(--dest-shared-blob-dir "${DOWNLOAD_BASE}")
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# shellcheck disable=SC2039
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# shellcheck disable=SC2068
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skopeo copy ${skopeo_args[@]} "${OCI_URL}" "oci:${DOWNLOAD_TEMP}:latest"
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ln -s "${DOWNLOAD_BASE}/sha256" "${DOWNLOAD_TEMP}/blobs/sha256"
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else
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skopeo copy ${skopeo_args[@]} "${OCI_URL}" "oci:${DOWNLOAD_TEMP}:latest"
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# shellcheck disable=SC2039
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# shellcheck disable=SC2068
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skopeo copy ${skopeo_args[@]} "${OCI_URL}" "oci:${DOWNLOAD_TEMP}:latest"
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fi
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echo "Unpacking the rootfs"
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# shellcheck disable=SC2039
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umoci_args=("")
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if [ -n "$LXC_MAPPED_UID" ] && [ "$LXC_MAPPED_UID" != "-1" ]; then
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umoci_args+=(--rootless)
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# shellcheck disable=SC2039
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umoci_args+=(--rootless)
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fi
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# shellcheck disable=SC2039
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# shellcheck disable=SC2068
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umoci unpack ${umoci_args[@]} --image "${DOWNLOAD_TEMP}:latest" "${LXC_ROOTFS}.tmp"
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rmdir "${LXC_ROOTFS}"
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mv "${LXC_ROOTFS}.tmp/rootfs" "${LXC_ROOTFS}"
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OCI_CONF_FILE=$(getconfigpath ${DOWNLOAD_TEMP} latest)
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OCI_CONF_FILE=$(getconfigpath "${DOWNLOAD_TEMP}" latest)
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LXC_CONF_FILE="${LXC_PATH}/config"
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entrypoint=$(getep ${OCI_CONF_FILE})
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entrypoint=$(getep "${OCI_CONF_FILE}")
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echo "lxc.execute.cmd = '${entrypoint}'" >> "${LXC_CONF_FILE}"
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echo "lxc.mount.auto = proc:mixed sys:mixed cgroup:mixed" >> "${LXC_CONF_FILE}"
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environment=$(getenv ${OCI_CONF_FILE})
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environment=$(getenv "${OCI_CONF_FILE}")
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# shellcheck disable=SC2039
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while read -r line; do
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echo "lxc.environment = ${line}" >> "${LXC_CONF_FILE}"
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echo "lxc.environment = ${line}" >> "${LXC_CONF_FILE}"
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done <<< "${environment}"
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if [ -e "${LXC_TEMPLATE_CONFIG}/common.conf" ]; then
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echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/common.conf" >> "${LXC_CONF_FILE}"
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echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/common.conf" >> "${LXC_CONF_FILE}"
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fi
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if [ -n "$LXC_MAPPED_UID" ] && [ "$LXC_MAPPED_UID" != "-1" ] && [ -e "${LXC_TEMPLATE_CONFIG}/userns.conf" ]; then
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echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/userns.conf" >> "${LXC_CONF_FILE}"
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echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/userns.conf" >> "${LXC_CONF_FILE}"
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fi
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if [ -e "${LXC_TEMPLATE_CONFIG}/oci.common.conf" ]; then
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echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/oci.common.conf" >> "${LXC_CONF_FILE}"
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echo "lxc.include = ${LXC_TEMPLATE_CONFIG}/oci.common.conf" >> "${LXC_CONF_FILE}"
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fi
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if [ "${OCI_USE_DHCP}" = "true" ]; then
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echo "lxc.hook.start-host = ${LXC_HOOK_DIR}/dhclient" >> "${LXC_CONF_FILE}"
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echo "lxc.hook.stop = ${LXC_HOOK_DIR}/dhclient" >> "${LXC_CONF_FILE}"
|
||||
echo "lxc.hook.start-host = ${LXC_HOOK_DIR}/dhclient" >> "${LXC_CONF_FILE}"
|
||||
echo "lxc.hook.stop = ${LXC_HOOK_DIR}/dhclient" >> "${LXC_CONF_FILE}"
|
||||
fi
|
||||
|
||||
echo "lxc.uts.name = ${LXC_NAME}" >> "${LXC_CONF_FILE}"
|
||||
# set the hostname
|
||||
cat <<EOF > ${LXC_ROOTFS}/etc/hostname
|
||||
cat <<EOF > "${LXC_ROOTFS}/etc/hostname"
|
||||
${LXC_NAME}
|
||||
EOF
|
||||
|
||||
# set minimal hosts
|
||||
cat <<EOF > ${LXC_ROOTFS}/etc/hosts
|
||||
cat <<EOF > "${LXC_ROOTFS}/etc/hosts"
|
||||
127.0.0.1 localhost
|
||||
127.0.1.1 ${LXC_NAME}
|
||||
::1 localhost ip6-localhost ip6-loopback
|
||||
@ -342,18 +362,21 @@ ff02::1 ip6-allnodes
|
||||
ff02::2 ip6-allrouters
|
||||
EOF
|
||||
|
||||
uidgid=($(getuidgid ${OCI_CONF_FILE}))
|
||||
# shellcheck disable=SC2039
|
||||
uidgid=($(getuidgid "${OCI_CONF_FILE}"))
|
||||
# shellcheck disable=SC2039
|
||||
echo "lxc.init.uid = ${uidgid[0]}" >> "${LXC_CONF_FILE}"
|
||||
# shellcheck disable=SC2039
|
||||
echo "lxc.init.gid = ${uidgid[1]}" >> "${LXC_CONF_FILE}"
|
||||
|
||||
cwd=$(getcwd ${OCI_CONF_FILE})
|
||||
cwd=$(getcwd "${OCI_CONF_FILE}")
|
||||
echo "lxc.init.cwd = ${cwd}" >> "${LXC_CONF_FILE}"
|
||||
|
||||
if [ -n "$LXC_MAPPED_UID" ] && [ "$LXC_MAPPED_UID" != "-1" ]; then
|
||||
chown $LXC_MAPPED_UID $LXC_PATH/config $LXC_PATH/fstab >/dev/null 2>&1 || true
|
||||
chown "$LXC_MAPPED_UID" "$LXC_PATH/config" "$LXC_PATH/fstab" > /dev/null 2>&1 || true
|
||||
fi
|
||||
if [ -n "$LXC_MAPPED_GID" ] && [ "$LXC_MAPPED_GID" != "-1" ]; then
|
||||
chgrp $LXC_MAPPED_GID $LXC_PATH/config $LXC_PATH/fstab >/dev/null 2>&1 || true
|
||||
chgrp "$LXC_MAPPED_GID" "$LXC_PATH/config" "$LXC_PATH/fstab" > /dev/null 2>&1 || true
|
||||
fi
|
||||
|
||||
exit 0
|
||||
|
||||
Loading…
Reference in New Issue
Block a user