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97 lines
2.5 KiB
97 lines
2.5 KiB
# Based on: https://github.com/concourse/docker-image-resource/blob/master/assets/common.sh |
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DOCKER_LOG_FILE=${DOCKER_LOG_FILE:-/tmp/docker.log} |
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SKIP_PRIVILEGED=${SKIP_PRIVILEGED:-false} |
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STARTUP_TIMEOUT=${STARTUP_TIMEOUT:-120} |
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sanitize_cgroups() { |
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mkdir -p /sys/fs/cgroup |
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mountpoint -q /sys/fs/cgroup || \ |
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mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup |
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mount -o remount,rw /sys/fs/cgroup |
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sed -e 1d /proc/cgroups | while read sys hierarchy num enabled; do |
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if [ "$enabled" != "1" ]; then |
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# subsystem disabled; skip |
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continue |
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fi |
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grouping="$(cat /proc/self/cgroup | cut -d: -f2 | grep "\\<$sys\\>")" || true |
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if [ -z "$grouping" ]; then |
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# subsystem not mounted anywhere; mount it on its own |
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grouping="$sys" |
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fi |
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mountpoint="/sys/fs/cgroup/$grouping" |
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mkdir -p "$mountpoint" |
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# clear out existing mount to make sure new one is read-write |
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if mountpoint -q "$mountpoint"; then |
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umount "$mountpoint" |
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fi |
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mount -n -t cgroup -o "$grouping" cgroup "$mountpoint" |
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if [ "$grouping" != "$sys" ]; then |
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if [ -L "/sys/fs/cgroup/$sys" ]; then |
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rm "/sys/fs/cgroup/$sys" |
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fi |
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ln -s "$mountpoint" "/sys/fs/cgroup/$sys" |
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fi |
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done |
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if ! test -e /sys/fs/cgroup/systemd ; then |
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mkdir /sys/fs/cgroup/systemd |
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mount -t cgroup -o none,name=systemd none /sys/fs/cgroup/systemd |
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fi |
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} |
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start_docker() { |
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mkdir -p /var/log |
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mkdir -p /var/run |
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if [ "$SKIP_PRIVILEGED" = "false" ]; then |
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sanitize_cgroups |
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# check for /proc/sys being mounted readonly, as systemd does |
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if grep '/proc/sys\s\+\w\+\s\+ro,' /proc/mounts >/dev/null; then |
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mount -o remount,rw /proc/sys |
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fi |
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fi |
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local mtu=$(cat /sys/class/net/$(ip route get 8.8.8.8|awk '{ print $5 }')/mtu) |
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local server_args="--mtu ${mtu}" |
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local registry="" |
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server_args="${server_args}" |
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if [ -n "$1" ]; then |
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server_args="${server_args} --registry-mirror https://$1" |
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fi |
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try_start() { |
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dockerd --data-root /scratch/docker ${server_args} >$DOCKER_LOG_FILE 2>&1 & |
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echo $! > /tmp/docker.pid |
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sleep 1 |
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echo waiting for docker to come up... |
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until docker info >/dev/null 2>&1; do |
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sleep 1 |
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if ! kill -0 "$(cat /tmp/docker.pid)" 2>/dev/null; then |
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return 1 |
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fi |
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done |
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} |
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export server_args DOCKER_LOG_FILE |
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declare -fx try_start |
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if ! timeout ${STARTUP_TIMEOUT} bash -ce 'while true; do try_start && break; done'; then |
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echo Docker failed to start within ${STARTUP_TIMEOUT} seconds. |
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return 1 |
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fi |
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}
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