59 lines
1.9 KiB
Bash
59 lines
1.9 KiB
Bash
#!/bin/sh
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set -e
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# Adapted from official docker-library/docker dind entrypoint
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# https://github.com/docker-library/docker/blob/master/24/dind/dockerd-entrypoint.sh
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if [ -z "$DOCKER_HOST" ]; then
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case "$1" in
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dockerd*)
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# If we're running dockerd, we need to make sure we have cgroups mounted
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if [ ! -d /sys/fs/cgroup ]; then
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mkdir -p /sys/fs/cgroup
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fi
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if ! mountpoint -q /sys/fs/cgroup; then
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mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
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fi
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# Mount cgroup v2 if available and not mounted
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if [ -e /sys/fs/cgroup/cgroup.controllers ] && ! mountpoint -q /sys/fs/cgroup; then
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mount -t cgroup2 -o nsdelegate cgroup2 /sys/fs/cgroup
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fi
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# If /sys/fs/cgroup is not a cgroup2 mount, we might need to mount cgroup v1 hierarchies
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if ! mountpoint -q /sys/fs/cgroup || [ "$(stat -f -c %T /sys/fs/cgroup)" != "cgroup2fs" ]; then
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if [ -d /sys/fs/cgroup/cgroup.controllers ]; then
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# It is cgroup2 but maybe not mounted as such?
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# Actually if it exists, it's likely v2.
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:
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else
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# cgroup v1
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for subsystem in $(awk '/^[^#]/ { print $1 }' /proc/cgroups); do
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mkdir -p "/sys/fs/cgroup/$subsystem"
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if ! mountpoint -q "/sys/fs/cgroup/$subsystem"; then
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mount -t cgroup -o "$subsystem" cgroup "/sys/fs/cgroup/$subsystem"
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fi
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done
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fi
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fi
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;;
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esac
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fi
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if [ "$1" = 'dockerd' ] || [ "${1#-}" != "$1" ]; then
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# if the first argument is "dockerd" or a flag (starts with -)
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if [ "${1#-}" != "$1" ]; then
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set -- dockerd "$@"
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fi
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# Explicitly use iptables-legacy if available, as it is often more stable for DinD
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if command -v update-alternatives >/dev/null; then
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if update-alternatives --query iptables | grep -q "iptables-legacy"; then
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update-alternatives --set iptables /usr/sbin/iptables-legacy || true
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update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy || true
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fi
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fi
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fi
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exec "$@"
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