Added entrypoint hooks for your own custom scripts (#1964)

* Added entrypoint hooks for your own custom scripts

Signed-off-by: Dennis Vestergaard Værum <github@varum.dk>

* Small changes:
- Only execute shell-scripts (mening files ending with .sh)
- Sort the files before executing them, had forgotten 😅
- Added a message when a hook script finish
- Added prefix arror to message to show the are related

Signed-off-by: Dennis Vestergaard Værum <github@varum.dk>

* Show in the search msg that it only searches for '*.sh' files

Signed-off-by: Dennis Vestergaard Værum <github@varum.dk>

* Fixed spelling mistake

Co-authored-by: J0WI <J0WI@users.noreply.github.com>
Signed-off-by: Dennis Værum <6872940+dvaerum@users.noreply.github.com>

* Updated the `README.md` file

Signed-off-by: Dennis Vestergaard Værum <github@varum.dk>

* change from using find to using a for-loop to located the `.sh` files

Signed-off-by: Dennis Vestergaard Værum <github@varum.dk>

* Fix bug - that would make docker-entrypoint.sh failed, hook folders was empty

Signed-off-by: Dennis Vestergaard Værum <github@varum.dk>

---------

Signed-off-by: Dennis Vestergaard Værum <github@varum.dk>
Signed-off-by: Dennis Værum <6872940+dvaerum@users.noreply.github.com>
Co-authored-by: J0WI <J0WI@users.noreply.github.com>

docker-entrypoint.sh

@@ -19,6 +19,39 @@ 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 (*.sh) to run, located in the folder: ${hook_folder_path}"
+
+    if [ -z "$(ls -A "${hook_folder_path}")" ]; then
+      echo "==> but the hook folder \"$(basename "${hook_folder_path}")\" is empty, so nothing to do"
+        return 0
+    fi
+
+    (
+        for script_file_path in "${hook_folder_path}/"*.sh; 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 (cwd: $(pwd)): \"${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: ${return_code}"
+                exit 1
+            fi
+
+            echo "==> Finished the script: \"${script_file_path}\""
+        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 +215,8 @@ 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 +239,16 @@ 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 +256,7 @@ 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 +267,8 @@ 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 "$@"