Gracefully handle shutdown

Dockerfile

@@ -155,17 +155,6 @@ ENV NVIDIA_DRIVER_CAPABILITIES="compute,video,utility"
 
 ENV PATH="/usr/lib/btbn-ffmpeg/bin:/usr/local/go2rtc/bin:/usr/local/nginx/sbin:${PATH}"
 
-# Fails if cont-init.d fails
-ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2
-# Wait indefinitely for cont-init.d to finish before starting services
-ENV S6_CMD_WAIT_FOR_SERVICES=1
-ENV S6_CMD_WAIT_FOR_SERVICES_MAXTIME=0
-# Configure logging to prepend timestamps, log to stdout, keep 1 archive and rotate on 10MB
-ENV S6_LOGGING_SCRIPT="T 1 n1 s10000000 T"
-# TODO: remove after a new version of s6-overlay is released. See:
-# https://github.com/just-containers/s6-overlay/issues/460#issuecomment-1327127006
-ENV S6_SERVICES_READYTIME=50
-
 # Install dependencies
 RUN --mount=type=bind,source=docker/install_deps.sh,target=/deps/install_deps.sh \
     /deps/install_deps.sh
@@ -182,6 +171,19 @@ EXPOSE 1935
 EXPOSE 8554
 EXPOSE 8555
 
+# Fails if cont-init.d fails
+ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2
+# Wait indefinitely for cont-init.d to finish before starting services
+ENV S6_CMD_WAIT_FOR_SERVICES=1
+ENV S6_CMD_WAIT_FOR_SERVICES_MAXTIME=0
+# Give services (including Frigate) 30 seconds to stop before killing them
+ENV S6_SERVICES_GRACETIME=30000
+# Configure logging to prepend timestamps, log to stdout, keep 1 archive and rotate on 10MB
+ENV S6_LOGGING_SCRIPT="T 1 n1 s10000000 T"
+# TODO: remove after a new version of s6-overlay is released. See:
+# https://github.com/just-containers/s6-overlay/issues/460#issuecomment-1327127006
+ENV S6_SERVICES_READYTIME=50
+
 ENTRYPOINT ["/init"]
 CMD []
 

docker/rootfs/etc/cont-init.d/prepare-logs.sh

@@ -1,7 +1,8 @@
 #!/command/with-contenv bash
 # shellcheck shell=bash
+# Prepare the logs folder for s6-log
 
-set -euo pipefail
+set -o errexit -o nounset -o pipefail
 
 mkdir -p /dev/shm/logs
 chown nobody:nogroup /dev/shm/logs

docker/rootfs/etc/services.d/frigate/finish

@@ -1,7 +1,16 @@
 #!/command/with-contenv bash
 # shellcheck shell=bash
-# Take down the S6 supervision tree when the process fails
+# Take down the S6 supervision tree when the service exits
 
-if [[ "${1}" -ne 0 && "${1}" -ne 256 ]]; then
-  exec /run/s6/basedir/bin/halt
+set -o errexit -o nounset -o pipefail
+
+# Prepare exit code
+if [[ "${1}" -eq 256 ]]; then
+  exit_code="$((128 + ${2}))"
+else
+  exit_code="${1}"
 fi
+
+# Make the container exit with the same exit code as the service
+echo "${exit_code}" > /run/s6-linux-init-container-results/exitcode
+exec /run/s6/basedir/bin/halt

docker/rootfs/etc/services.d/frigate/run

@@ -1,9 +1,11 @@
-#!/command/with-contenv bash
+#!/bin/bash
 # shellcheck shell=bash
+# Start the Frigate service
 
-set -euo pipefail
+set -o errexit -o nounset -o pipefail -o xtrace
 
 cd /opt/frigate
 
+# Replace the bash process with the Frigate process, redirecting stderr to stdout
 exec 2>&1
 exec python3 -u -m frigate

docker/rootfs/etc/services.d/go2rtc/finish

@@ -1,6 +1,7 @@
 #!/command/with-contenv bash
 # shellcheck shell=bash
-# Take down the S6 supervision tree when the process fails
+# Take down the S6 supervision tree when the service fails, or restart it
+# otherwise
 
 if [[ "${1}" -ne 0 && "${1}" -ne 256 ]]; then
   exec /run/s6/basedir/bin/halt

docker/rootfs/etc/services.d/go2rtc/run

@@ -1,8 +1,8 @@
 #!/command/with-contenv bash
 # shellcheck shell=bash
+# Start the go2rtc service
 
-# https://gist.github.com/mohanpedala/1e2ff5661761d3abd0385e8223e16425?permalink_comment_id=3945021
-set -euo pipefail
+set -o errexit -o nounset -o pipefail
 
 if [[ -f "/config/frigate-go2rtc.yaml" ]]; then
     config_path="/config/frigate-go2rtc.yaml"
@@ -10,5 +10,6 @@ else
     config_path="/usr/local/go2rtc/go2rtc.yaml"
 fi
 
+# Replace the bash process with the go2rtc process, redirecting stderr to stdout
 exec 2>&1
 exec go2rtc -config="${config_path}"

docker/rootfs/etc/services.d/nginx/finish

@@ -1,6 +1,7 @@
 #!/command/with-contenv bash
 # shellcheck shell=bash
-# Take down the S6 supervision tree when the process fails
+# Take down the S6 supervision tree when the service fails, or restart it
+# otherwise
 
 if [[ "${1}" -ne 0 && "${1}" -ne 256 ]]; then
   exec /run/s6/basedir/bin/halt

docker/rootfs/etc/services.d/nginx/run

@@ -1,5 +1,7 @@
 #!/command/with-contenv bash
 # shellcheck shell=bash
+# Start the NGINX service
 
+# Replace the bash process with the NGINX process, redirecting stderr to stdout
 exec 2>&1
 exec nginx