mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
135 lines
5.1 KiB
Bash
Executable file
135 lines
5.1 KiB
Bash
Executable file
#!/bin/sh
|
|
# dockerd-rootless.sh executes dockerd in rootless mode.
|
|
#
|
|
# Usage: dockerd-rootless.sh [DOCKERD_OPTIONS]
|
|
#
|
|
# External dependencies:
|
|
# * newuidmap and newgidmap needs to be installed.
|
|
# * /etc/subuid and /etc/subgid needs to be configured for the current user.
|
|
# * Either one of slirp4netns (>= v0.4.0), VPNKit, lxc-user-nic needs to be installed.
|
|
#
|
|
# Recognized environment variables:
|
|
# * DOCKERD_ROOTLESS_ROOTLESSKIT_NET=(slirp4netns|vpnkit|lxc-user-nic): the rootlesskit network driver. Defaults to "slirp4netns" if slirp4netns (>= v0.4.0) is installed. Otherwise defaults to "vpnkit".
|
|
# * DOCKERD_ROOTLESS_ROOTLESSKIT_MTU=NUM: the MTU value for the rootlesskit network driver. Defaults to 65520 for slirp4netns, 1500 for other drivers.
|
|
# * DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=(builtin|slirp4netns): the rootlesskit port driver. Defaults to "builtin".
|
|
# * DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX=(auto|true|false): whether to protect slirp4netns with a dedicated mount namespace. Defaults to "auto".
|
|
# * DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP=(auto|true|false): whether to protect slirp4netns with seccomp. Defaults to "auto".
|
|
#
|
|
# See the documentation for the further information: https://docs.docker.com/go/rootless/
|
|
|
|
set -e -x
|
|
case "$1" in
|
|
"check" | "install" | "uninstall")
|
|
echo "Did you mean 'dockerd-rootless-setuptool.sh $@' ?"
|
|
exit 1
|
|
;;
|
|
esac
|
|
if ! [ -w "$XDG_RUNTIME_DIR" ]; then
|
|
echo "XDG_RUNTIME_DIR needs to be set and writable"
|
|
exit 1
|
|
fi
|
|
if ! [ -d "$HOME" ]; then
|
|
echo "HOME needs to be set and exist."
|
|
exit 1
|
|
fi
|
|
|
|
rootlesskit=""
|
|
for f in docker-rootlesskit rootlesskit; do
|
|
if command -v $f > /dev/null 2>&1; then
|
|
rootlesskit=$f
|
|
break
|
|
fi
|
|
done
|
|
if [ -z "$rootlesskit" ]; then
|
|
echo "rootlesskit needs to be installed"
|
|
exit 1
|
|
fi
|
|
|
|
: "${DOCKERD_ROOTLESS_ROOTLESSKIT_NET:=}"
|
|
: "${DOCKERD_ROOTLESS_ROOTLESSKIT_MTU:=}"
|
|
: "${DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER:=builtin}"
|
|
: "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX:=auto}"
|
|
: "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP:=auto}"
|
|
net=$DOCKERD_ROOTLESS_ROOTLESSKIT_NET
|
|
mtu=$DOCKERD_ROOTLESS_ROOTLESSKIT_MTU
|
|
if [ -z "$net" ]; then
|
|
if command -v slirp4netns > /dev/null 2>&1; then
|
|
# If --netns-type is present in --help, slirp4netns is >= v0.4.0.
|
|
if slirp4netns --help | grep -qw -- --netns-type; then
|
|
net=slirp4netns
|
|
if [ -z "$mtu" ]; then
|
|
mtu=65520
|
|
fi
|
|
else
|
|
echo "slirp4netns found but seems older than v0.4.0. Falling back to VPNKit."
|
|
fi
|
|
fi
|
|
if [ -z "$net" ]; then
|
|
if command -v vpnkit > /dev/null 2>&1; then
|
|
net=vpnkit
|
|
else
|
|
echo "Either slirp4netns (>= v0.4.0) or vpnkit needs to be installed"
|
|
exit 1
|
|
fi
|
|
fi
|
|
fi
|
|
if [ -z "$mtu" ]; then
|
|
mtu=1500
|
|
fi
|
|
|
|
dockerd="${DOCKERD:-dockerd}"
|
|
|
|
if [ -z "$_DOCKERD_ROOTLESS_CHILD" ]; then
|
|
_DOCKERD_ROOTLESS_CHILD=1
|
|
export _DOCKERD_ROOTLESS_CHILD
|
|
if [ "$(id -u)" = "0" ]; then
|
|
echo "This script must be executed as a non-privileged user"
|
|
exit 1
|
|
fi
|
|
# `selinuxenabled` always returns false in RootlessKit child, so we execute `selinuxenabled` in the parent.
|
|
# https://github.com/rootless-containers/rootlesskit/issues/94
|
|
if command -v selinuxenabled > /dev/null 2>&1 && selinuxenabled; then
|
|
_DOCKERD_ROOTLESS_SELINUX=1
|
|
export _DOCKERD_ROOTLESS_SELINUX
|
|
fi
|
|
# Re-exec the script via RootlessKit, so as to create unprivileged {user,mount,network} namespaces.
|
|
#
|
|
# --copy-up allows removing/creating files in the directories by creating tmpfs and symlinks
|
|
# * /etc: copy-up is required so as to prevent `/etc/resolv.conf` in the
|
|
# namespace from being unexpectedly unmounted when `/etc/resolv.conf` is recreated on the host
|
|
# (by either systemd-networkd or NetworkManager)
|
|
# * /run: copy-up is required so that we can create /run/docker (hardcoded for plugins) in our namespace
|
|
exec $rootlesskit \
|
|
--net=$net --mtu=$mtu \
|
|
--slirp4netns-sandbox=$DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX \
|
|
--slirp4netns-seccomp=$DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP \
|
|
--disable-host-loopback --port-driver=$DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER \
|
|
--copy-up=/etc --copy-up=/run \
|
|
--propagation=rslave \
|
|
$DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS \
|
|
$0 $@
|
|
else
|
|
[ "$_DOCKERD_ROOTLESS_CHILD" = 1 ]
|
|
# remove the symlinks for the existing files in the parent namespace if any,
|
|
# so that we can create our own files in our mount namespace.
|
|
rm -f /run/docker /run/containerd /run/xtables.lock
|
|
|
|
if [ -n "$_DOCKERD_ROOTLESS_SELINUX" ]; then
|
|
# iptables requires /run in the child to be relabeled. The actual /run in the parent is unaffected.
|
|
# https://github.com/containers/podman/blob/e6fc34b71aa9d876b1218efe90e14f8b912b0603/libpod/networking_linux.go#L396-L401
|
|
# https://github.com/moby/moby/issues/41230
|
|
chcon system_u:object_r:iptables_var_run_t:s0 /run
|
|
fi
|
|
|
|
if [ "$(stat -c %T -f /etc)" = "tmpfs" ] && [ -L "/etc/ssl" ]; then
|
|
# Workaround for "x509: certificate signed by unknown authority" on openSUSE Tumbleweed.
|
|
# https://github.com/rootless-containers/rootlesskit/issues/225
|
|
realpath_etc_ssl=$(realpath /etc/ssl)
|
|
rm -f /etc/ssl
|
|
mkdir /etc/ssl
|
|
mount --rbind ${realpath_etc_ssl} /etc/ssl
|
|
fi
|
|
|
|
# shellcheck disable=SC2086
|
|
exec $dockerd "$@"
|
|
fi
|