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#!/usr/bin/env bash
set -euo pipefail
[ "${NIXOS_WSL_DEBUG:-}" == "1" ] && set -x
rundir="/run/nixos-wsl"
pidfile="$rundir/unshare.pid"
ensure_root() {
if [ $EUID -ne 0 ]; then
echo "[ERROR] Requires root! :( Make sure the WSL default user is set to root" >&2
exit 1
fi
}
activate() {
mount --bind -o ro /nix/store /nix/store
LANG="C.UTF-8" /nix/var/nix/profiles/system/activate
}
create_rundir() {
if [ ! -d $rundir ]; then
mkdir -p $rundir/ns
touch $rundir/ns/{pid,mount}
fi
}
is_unshare_alive() {
[ -e $pidfile ] && [ -d "/proc/$(<$pidfile)" ]
}
run_in_namespace() {
nsenter \
--pid=$rundir/ns/pid \
--mount=$rundir/ns/mount \
-- "$@"
}
start_systemd() {
mount --bind --make-private $rundir $rundir
daemonize \
-o $rundir/stdout \
-e $rundir/stderr \
-l $rundir/systemd.lock \
-p $pidfile \
-E LOCALE_ARCHIVE=/run/current-system/sw/lib/locale/locale-archive \
"$(command -v unshare)" \
--fork \
--pid=$rundir/ns/pid \
--mount=$rundir/ns/mount \
--mount-proc=/proc \
--propagation=unchanged \
nixos-wsl-systemd-wrapper
# Wait for systemd to start
while ! (run_in_namespace systemctl is-system-running -q --wait) &>/dev/null; do
sleep 1
if ! is_unshare_alive; then
echo "[ERROR] systemd startup failed!"
echo "[ERROR] stderr:"
cat $rundir/stderr
echo "[ERROR] stdout:"
cat $rundir/stdout
exit 1
fi
done
}
get_shell() {
getent passwd "$1" | cut -d: -f7
}
get_home() {
getent passwd "$1" | cut -d: -f6
}
is_in_container() {
[ "${INSIDE_NAMESPACE:-}" == "true" ]
}
clean_wslpath() {
echo "$PATH" | tr ':' '\n' | grep -E "^@automountPath@" | tr '\n' ':'
}
main() {
ensure_root
if [ ! -e "/run/current-system" ]; then
activate
fi
if [ ! -e "$rundir" ]; then
create_rundir
fi
if ! is_in_container && ! is_unshare_alive; then
start_systemd
fi
if [ $# -gt 1 ]; then # Ignore just -c without a command
# wsl seems to prefix with "-c"
shift
command="$(get_shell @username@) -l -c \"$*\""
else
command="$(get_shell @username@) -l"
fi
# If we're executed from inside the container, e.g. sudo
if is_in_container; then
eval $command
fi
# If we are currently in /root, this is probably because the directory that WSL was started is inaccessible
# cd to the user's home to prevent a warning about permission being denied on /root
if [ "$PWD" == "/root" ]; then
cd "$(get_home @username@)"
fi
# Pass external environment but filter variables specific to root user.
exportCmd="$(export -p | grep -vE ' (HOME|LOGNAME|SHELL|USER)=')"
run_in_namespace \
systemd-run \
--quiet \
--collect \
--wait \
--pty \
--service-type=exec \
--setenv=INSIDE_NAMESPACE=true \
--setenv=WSLPATH="$(clean_wslpath)" \
--working-directory="$PWD" \
--machine=.host \
"$(which runuser)" --pty -u @username@ -- /bin/sh -c "$exportCmd; source /etc/set-environment; exec $command"
}
main "$@"
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