From 4fd6e70cd1ca6b009284826ed491e2153c8e43d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dennis=20Vestergaard=20V=C3=A6rum?= <github@varum.dk>
Date: Tue, 4 Apr 2023 18:51:51 +0200
Subject: [PATCH] Added entrypoint hooks for your own custom scripts
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Signed-off-by: Dennis Vestergaard Værum <github@varum.dk>
---
 Dockerfile-alpine.template |  5 +++++
 Dockerfile-debian.template |  5 +++++
 README.md                  | 30 ++++++++++++++++++++++++++++++
 docker-entrypoint.sh       | 36 ++++++++++++++++++++++++++++++++++++
 4 files changed, 76 insertions(+)

diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index 59b73bcc41..62b57365c8 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -99,6 +99,11 @@ RUN { \
     } > "${PHP_INI_DIR}/conf.d/nextcloud.ini"; \
     \
     mkdir /var/www/data; \
+    mkdir -p /docker-entrypoint-hooks.d/pre-installation \
+             /docker-entrypoint-hooks.d/post-installation \
+             /docker-entrypoint-hooks.d/pre-upgrade \
+             /docker-entrypoint-hooks.d/post-upgrade \
+             /docker-entrypoint-hooks.d/before-starting; \
     chown -R www-data:root /var/www; \
     chmod -R g=u /var/www
 
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index d3fb81ee9b..ca309d6c09 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -111,6 +111,11 @@ RUN { \
     } > "${PHP_INI_DIR}/conf.d/nextcloud.ini"; \
     \
     mkdir /var/www/data; \
+    mkdir -p /docker-entrypoint-hooks.d/pre-installation \
+             /docker-entrypoint-hooks.d/post-installation \
+             /docker-entrypoint-hooks.d/pre-upgrade \
+             /docker-entrypoint-hooks.d/post-upgrade \
+             /docker-entrypoint-hooks.d/before-starting; \
     chown -R www-data:root /var/www; \
     chmod -R g=u /var/www
 
diff --git a/README.md b/README.md
index 20a9cecf50..675c192ffb 100644
--- a/README.md
+++ b/README.md
@@ -202,6 +202,36 @@ To customize other PHP limits you can simply change the following variables:
 - `PHP_UPLOAD_LIMIT` (default `512M`) This sets the upload limit (`post_max_size` and `upload_max_filesize`) for big files. Note that you may have to change other limits depending on your client, webserver or operating system. Check the [Nextcloud documentation](https://docs.nextcloud.com/server/latest/admin_manual/configuration_files/big_file_upload_configuration.html) for more information.
 
 
+## Auto configuration via hook folders
+
+There are 5 hooks
+
+- `pre-installation` Executed before the Nextcloud is installed/initiated
+- `post-installation` Executed after the Nextcloud is installed/initiated
+- `pre-upgrade` Executed before the Nextcloud is upgraded
+- `post-upgrade` Executed after the Nextcloud is upgraded
+- `before-starting` Executed before the Nextcloud is started
+
+To use the hooks triggered by the entrypoint script... either added the script(s) to one/more of the hook folders, which are located at the path `/docker-entrypoint-hooks.d` in the container. It is also possible to use volume(s) to insert the script into the container.
+
+**Remember:** Only the script(s) markted with the executable flag are executed.
+
+**Example:**
+```yaml
+...
+  app:
+    image: nextcloud:stable
+
+    volumes:
+      - ./app-hooks/pre-installation:/docker-entrypoint-hooks.d/pre-installation
+      - ./app-hooks/post-installation:/docker-entrypoint-hooks.d/post-installation
+      - ./app-hooks/pre-upgrade:/docker-entrypoint-hooks.d/pre-upgrade
+      - ./app-hooks/post-upgrade:/docker-entrypoint-hooks.d/post-upgrade
+      - ./app-hooks/before-starting:/docker-entrypoint-hooks.d/before-starting
+...
+```
+
+
 ## Using the apache image behind a reverse proxy and auto configure server host and protocol
 
 The apache image will replace the remote addr (IP address visible to Nextcloud) with the IP address from `X-Real-IP` if the request is coming from a proxy in `10.0.0.0/8`, `172.16.0.0/12` or `192.168.0.0/16` by default. If you want Nextcloud to pick up the server host (`HTTP_X_FORWARDED_HOST`), protocol (`HTTP_X_FORWARDED_PROTO`) and client IP (`HTTP_X_FORWARDED_FOR`) from a trusted proxy, then disable rewrite IP and add the reverse proxy's IP address to `TRUSTED_PROXIES`.
diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index 37441fd8fa..d23e9127d2 100755
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -19,6 +19,33 @@ run_as() {
     fi
 }
 
+# Execute all executable files in a given directory in alphanumeric order
+run_path() {
+    local hook_folder_path="/docker-entrypoint-hooks.d/$1"
+    local return_code=0
+
+    echo "Searching for scripts to run in the folder: ${hook_folder_path}"
+
+    (
+        cd "${hook_folder_path}"
+        find . -type f -print | while read script_file_path; do
+            if ! [ -x "${script_file_path}" ] && [ -f "${script_file_path}" ]; then
+                echo "The script \"${script_file_path}\" in the folder \"${hook_folder_path}\" was skipping, because it didn't have the executable flag"
+                continue
+            fi
+
+            echo "Running the script: \"${script_file_path}\""
+
+            run_as "${script_file_path}" || return_code="$?"
+
+            if [ "${return_code}" -ne "0" ]; then
+                echo "Failed at executing \"${script_file_path}\". Exit code: ${return_code}"
+                exit 1
+            fi
+        done
+    )
+}
+
 # usage: file_env VAR [DEFAULT]
 #    ie: file_env 'XYZ_DB_PASSWORD' 'example'
 # (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
@@ -182,6 +209,8 @@ if expr "$1" : "apache" 1>/dev/null || [ "$1" = "php-fpm" ] || [ "${NEXTCLOUD_UP
                     fi
 
                     if [ "$install" = true ]; then
+                        run_path pre-installation
+
                         echo "Starting nextcloud installation"
                         max_retries=10
                         try=0
@@ -204,12 +233,16 @@ if expr "$1" : "apache" 1>/dev/null || [ "$1" = "php-fpm" ] || [ "${NEXTCLOUD_UP
                                 NC_TRUSTED_DOMAIN_IDX=$((NC_TRUSTED_DOMAIN_IDX+1))
                             done
                         fi
+
+                        run_path post-installation
                     else
                         echo "Please run the web-based installer on first connect!"
                     fi
                 fi
             # Upgrade
             else
+                run_path pre-upgrade
+
                 run_as 'php /var/www/html/occ upgrade'
 
                 run_as 'php /var/www/html/occ app:list' | sed -n "/Enabled:/,/Disabled:/p" > /tmp/list_after
@@ -217,6 +250,7 @@ if expr "$1" : "apache" 1>/dev/null || [ "$1" = "php-fpm" ] || [ "${NEXTCLOUD_UP
                 diff /tmp/list_before /tmp/list_after | grep '<' | cut -d- -f2 | cut -d: -f1
                 rm -f /tmp/list_before /tmp/list_after
 
+                run_path post-upgrade
             fi
 
             echo "Initializing finished"
@@ -227,6 +261,8 @@ if expr "$1" : "apache" 1>/dev/null || [ "$1" = "php-fpm" ] || [ "${NEXTCLOUD_UP
             run_as 'php /var/www/html/occ maintenance:update:htaccess'
         fi
     ) 9> /var/www/html/nextcloud-init-sync.lock
+
+    run_path before-starting
 fi
 
 exec "$@"