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| 1 | +# Based on: https://github.com/concourse/docker-image-resource/blob/master/assets/common.sh |
| 2 | + |
| 3 | +DOCKER_LOG_FILE=${DOCKER_LOG_FILE:-/tmp/docker.log} |
| 4 | +SKIP_PRIVILEGED=${SKIP_PRIVILEGED:-false} |
| 5 | +STARTUP_TIMEOUT=${STARTUP_TIMEOUT:-120} |
| 6 | + |
| 7 | +sanitize_cgroups() { |
| 8 | + mkdir -p /sys/fs/cgroup |
| 9 | + mountpoint -q /sys/fs/cgroup || \ |
| 10 | + mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup |
| 11 | + |
| 12 | + mount -o remount,rw /sys/fs/cgroup |
| 13 | + |
| 14 | + sed -e 1d /proc/cgroups | while read sys hierarchy num enabled; do |
| 15 | + if [ "$enabled" != "1" ]; then |
| 16 | + # subsystem disabled; skip |
| 17 | + continue |
| 18 | + fi |
| 19 | + |
| 20 | + grouping="$(cat /proc/self/cgroup | cut -d: -f2 | grep "\\<$sys\\>")" || true |
| 21 | + if [ -z "$grouping" ]; then |
| 22 | + # subsystem not mounted anywhere; mount it on its own |
| 23 | + grouping="$sys" |
| 24 | + fi |
| 25 | + |
| 26 | + mountpoint="/sys/fs/cgroup/$grouping" |
| 27 | + |
| 28 | + mkdir -p "$mountpoint" |
| 29 | + |
| 30 | + # clear out existing mount to make sure new one is read-write |
| 31 | + if mountpoint -q "$mountpoint"; then |
| 32 | + umount "$mountpoint" |
| 33 | + fi |
| 34 | + |
| 35 | + mount -n -t cgroup -o "$grouping" cgroup "$mountpoint" |
| 36 | + |
| 37 | + if [ "$grouping" != "$sys" ]; then |
| 38 | + if [ -L "/sys/fs/cgroup/$sys" ]; then |
| 39 | + rm "/sys/fs/cgroup/$sys" |
| 40 | + fi |
| 41 | + |
| 42 | + ln -s "$mountpoint" "/sys/fs/cgroup/$sys" |
| 43 | + fi |
| 44 | + done |
| 45 | + |
| 46 | + if ! test -e /sys/fs/cgroup/systemd ; then |
| 47 | + mkdir /sys/fs/cgroup/systemd |
| 48 | + mount -t cgroup -o none,name=systemd none /sys/fs/cgroup/systemd |
| 49 | + fi |
| 50 | +} |
| 51 | + |
| 52 | +start_docker() { |
| 53 | + mkdir -p /var/log |
| 54 | + mkdir -p /var/run |
| 55 | + |
| 56 | + if [ "$SKIP_PRIVILEGED" = "false" ]; then |
| 57 | + sanitize_cgroups |
| 58 | + |
| 59 | + # check for /proc/sys being mounted readonly, as systemd does |
| 60 | + if grep '/proc/sys\s\+\w\+\s\+ro,' /proc/mounts >/dev/null; then |
| 61 | + mount -o remount,rw /proc/sys |
| 62 | + fi |
| 63 | + fi |
| 64 | + |
| 65 | + local mtu=$(cat /sys/class/net/$(ip route get 8.8.8.8|awk '{ print $5 }')/mtu) |
| 66 | + local server_args="--mtu ${mtu}" |
| 67 | + local registry="" |
| 68 | + |
| 69 | + server_args="${server_args}" |
| 70 | + |
| 71 | + for registry in $3; do |
| 72 | + server_args="${server_args} --insecure-registry ${registry}" |
| 73 | + done |
| 74 | + |
| 75 | + if [ -n "$4" ]; then |
| 76 | + server_args="${server_args} --registry-mirror $4" |
| 77 | + fi |
| 78 | + |
| 79 | + try_start() { |
| 80 | + dockerd --data-root /scratch/docker ${server_args} >$DOCKER_LOG_FILE 2>&1 & |
| 81 | + echo $! > /tmp/docker.pid |
| 82 | + |
| 83 | + sleep 1 |
| 84 | + |
| 85 | + echo waiting for docker to come up... |
| 86 | + until docker info >/dev/null 2>&1; do |
| 87 | + sleep 1 |
| 88 | + if ! kill -0 "$(cat /tmp/docker.pid)" 2>/dev/null; then |
| 89 | + return 1 |
| 90 | + fi |
| 91 | + done |
| 92 | + } |
| 93 | + |
| 94 | + export server_args DOCKER_LOG_FILE |
| 95 | + declare -fx try_start |
| 96 | + trap stop_docker EXIT |
| 97 | + |
| 98 | + if ! timeout ${STARTUP_TIMEOUT} bash -ce 'while true; do try_start && break; done'; then |
| 99 | + echo Docker failed to start within ${STARTUP_TIMEOUT} seconds. |
| 100 | + return 1 |
| 101 | + fi |
| 102 | +} |
| 103 | + |
| 104 | +stop_docker() { |
| 105 | + local pid=$(cat /tmp/docker.pid) |
| 106 | + if [ -z "$pid" ]; then |
| 107 | + return 0 |
| 108 | + fi |
| 109 | + |
| 110 | + kill -TERM $pid |
| 111 | +} |
| 112 | + |
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