README.md

@@ -87,5 +87,8 @@ This is how to configure your Mattermost server to accept logins from your Authe
 - `abra app deploy YOURAPPNAME`
 
 
+# Technical Notes
+This recipe inserts a statically-compiled busybox binary from `busybox:1.25-uclibc` into the distroless container, to allow running the custom entrypoint shell script which configures Mattermost.
+
 [`abra`]: https://git.coopcloud.tech/coop-cloud/abra
 [`coop-cloud/traefik`]: https://git.coopcloud.tech/coop-cloud/traefik

abra.sh

@@ -1,5 +1,6 @@
-export ENTRYPOINT_VERSION=v2
+export ENTRYPOINT_VERSION=v3
 export MATTERMOST_CONFIG_VERSION=v1
+export SHELL_VERSION=v1
 
 reset_config() {
     cp /config-to-copy.json /mattermost/config/config.json && touch /mattermost/config/CoopCloudManaged

compose.yml

@@ -2,7 +2,7 @@ version: "3.8"
 
 services:
   app:
-    image: mattermost/mattermost-team-edition:10.5.14
+    image: mattermost/mattermost-team-edition:10.11
     environment:
       - TZ
       - MM_SQLSETTINGS_DRIVERNAME=postgres
@@ -33,6 +33,9 @@ services:
         - "backupbot.backup=true"
         - "backupbot.backup.path=/mattermost,/etc/ssl"
     configs:
+      - source: busybox
+        target: /bin/busybox
+        mode: 0555
       - source: abra_mattermost_entrypoint
         target: /abra-mattermost-entrypoint.sh
         mode: 0555
@@ -69,6 +72,9 @@ configs:
   abra_mattermost_entrypoint:
     name: ${STACK_NAME}_entrypoint_${ENTRYPOINT_VERSION}
     file: ./entrypoint.sh
+  busybox:
+    name: ${STACK_NAME}_busybox_${SHELL_VERSION}
+    file: ./bin/busybox
 
 
 networks:

entrypoint.sh

@@ -1,4 +1,13 @@
-#!/bin/sh
+#!/bin/busybox sh
+/bin/busybox mkdir /tmp/bin
+export PATH=$PATH:/tmp/bin
+/bin/busybox ln -s /bin/busybox /tmp/bin/ln
+ln -s /bin/busybox /tmp/bin/cat
+ln -s /bin/busybox /tmp/bin/echo
+ln -s /bin/busybox /tmp/bin/cp
+ln -s /bin/busybox /tmp/bin/touch
+ln -s /bin/busybox /tmp/bin/rm
+
 set -e
 if test -f "/run/secrets/postgres_password"; then
     pwd=`cat /run/secrets/postgres_password`
@@ -21,5 +30,7 @@ if ! test -f "/mattermost/config/CoopCloudManaged"; then
     cp /config-to-copy.json /mattermost/config/config.json && touch /mattermost/config/CoopCloudManaged
 fi
 
-# https://github.com/mattermost/mattermost-server/blob/master/build/Dockerfile
-/entrypoint.sh "mattermost"
+rm -rf /tmp/bin
+
+# https://github.com/mattermost/mattermost/blob/master/server/build/Dockerfile
+/mattermost/bin/mattermost