dotfiles/system-nix/nixos-wsl/syschdemd.sh

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#! @shell@
set -e
sw="/nix/var/nix/profiles/system/sw/bin"
systemPath=$(${sw}/readlink -f /nix/var/nix/profiles/system)
function start_systemd {
echo "Starting systemd..." >&2
PATH=/run/current-system/systemd/lib/systemd:@fsPackagesPath@ \
LOCALE_ARCHIVE=/run/current-system/sw/lib/locale/locale-archive \
@daemonize@/bin/daemonize /run/current-system/sw/bin/unshare -fp --mount-proc @systemdWrapper@
# Wait until systemd has been started to prevent a race condition from occuring
while ! $sw/pgrep -xf systemd | $sw/tail -n1 >/run/systemd.pid; do
$sw/sleep 1s
done
# Wait for systemd to start services
status=1
while [[ $status -gt 0 ]]; do
$sw/sleep 1
status=0
$sw/nsenter -t $(</run/systemd.pid) -p -m -- \
$sw/systemctl is-system-running -q --wait 2>/dev/null ||
status=$?
done
}
# Needs root to work
if [[ $EUID -ne 0 ]]; then
echo "[ERROR] Requires root! :( Make sure the WSL default user is set to root" >&2
exit 1
fi
if [ ! -e "/run/current-system" ]; then
LANG="C.UTF-8" /nix/var/nix/profiles/system/activate
fi
if [ ! -e "/run/systemd.pid" ]; then
start_systemd
fi
userShell=$($sw/getent passwd @defaultUser@ | $sw/cut -d: -f7)
if [[ $# -gt 0 ]]; then
# wsl seems to prefix with "-c"
shift
cmd="$@"
else
cmd="$userShell"
fi
# Pass external environment but filter variables specific to root user.
exportCmd="$(export -p | $sw/grep -vE ' (HOME|LOGNAME|SHELL|USER)='); export WSLPATH=\"$PATH\"; export INSIDE_NAMESPACE=true"
if [[ -z "${INSIDE_NAMESPACE:-}" ]]; then
# Test whether systemd is still alive if it was started previously
if ! [ -d "/proc/$(</run/systemd.pid)" ]; then
# Clear systemd pid if the process is not alive anymore
$sw/rm /run/systemd.pid
start_systemd
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 @defaultUserHome@
fi
exec $sw/nsenter -t $(</run/systemd.pid) -p -m -- $sw/machinectl -q \
--uid=@defaultUser@ shell .host /bin/sh -c \
"cd \"$PWD\"; $exportCmd; source /etc/set-environment; exec $cmd"
else
exec $cmd
fi