transmission: env-var-settings initial release

root/etc/s6-overlay/s6-rc.d/init-mod-imagename-modname-add-package/run

@@ -1,30 +0,0 @@
-#!/usr/bin/with-contenv bash
-
-# This is the init file used for adding os or pip packages to install lists.
-# It takes advantage of the built-in init-mods-package-install init script that comes with the baseimages.
-# If using this, we need to make sure we set this init as a dependency of init-mods-package-install so this one runs first
-
-if ! command -v apprise; then
-    echo "**** Adding apprise and its deps to package install lists ****"
-    echo "apprise" >> /mod-pip-packages-to-install.list
-    ## Ubuntu
-    if [ -f /usr/bin/apt ]; then
-        echo "\
-            python3 \
-            python3-pip \
-            runc" >> /mod-repo-packages-to-install.list
-    fi
-    # Alpine
-    if [ -f /sbin/apk ]; then
-        echo "\
-            cargo \
-            libffi-dev \
-            openssl-dev \
-            python3 \
-            python3-dev \
-            python3 \
-            py3-pip" >> /mod-repo-packages-to-install.list
-    fi
-else
-    echo "**** apprise already installed, skipping ****"
-fi

root/etc/s6-overlay/s6-rc.d/init-mod-imagename-modname-add-package/type

@@ -1 +0,0 @@
-oneshot

root/etc/s6-overlay/s6-rc.d/init-mod-imagename-modname-add-package/up

@@ -1 +0,0 @@
-/etc/s6-overlay/s6-rc.d/init-mod-imagename-modname-add-package/run

root/etc/s6-overlay/s6-rc.d/init-mod-imagename-modname-install/run

@@ -1,8 +0,0 @@
-#!/usr/bin/with-contenv bash
-
-# This is an install script that is designed to run after init-mods-package-install
-# so it can take advantage of packages installed
-# init-mods-end depends on this script so that later init and services wait until this script exits
-
-echo "**** Setting up apprise ****"
-apprise blah blah

root/etc/s6-overlay/s6-rc.d/init-mod-imagename-modname-install/type

@@ -1 +0,0 @@
-oneshot

root/etc/s6-overlay/s6-rc.d/init-mod-imagename-modname-install/up

@@ -1 +0,0 @@
-/etc/s6-overlay/s6-rc.d/init-mod-imagename-modname-install/run

root/etc/s6-overlay/s6-rc.d/init-mod-transmission-env-var-settings/run

@@ -0,0 +1,59 @@
+#!/usr/bin/with-contenv python3
+
+import json
+import os
+import sys
+
+from json.decoder import JSONDecodeError
+
+SETTINGS_FILE_PATH = "/config/settings.json"
+
+
+def setting_name_env_var_name(setting_name):
+    return "TRANSMISSION_{}".format(setting_name.replace("-", "_").upper())
+
+
+def main():
+    # check file exists and is writable, just in case..
+    if not os.path.exists(SETTINGS_FILE_PATH):
+        raise Exception(f"Settings file '{SETTINGS_FILE_PATH}' does not exist.")
+    if not os.path.isfile(SETTINGS_FILE_PATH):
+        raise Exception(f"Settings file '{SETTINGS_FILE_PATH}' is a directory.")
+    if not os.access(SETTINGS_FILE_PATH, os.W_OK):
+        raise Exception(f"Settings file '{SETTINGS_FILE_PATH}' is not writable.")
+
+    # read settings file
+    settings_json = None
+    with open(SETTINGS_FILE_PATH, "r") as f:
+        settings_json = json.loads(f.read())
+
+    # update settings with ENV vars
+    for setting_name in settings_json:
+        env_var_name = setting_name_env_var_name(setting_name)
+        env_var_value = os.getenv(env_var_name)
+
+        if env_var_value is not None:
+            setting_type = type(settings_json[setting_name])
+            if setting_type == bool:
+                setting_value = env_var_value.lower() == "true"
+            else:
+                setting_value = setting_type(env_var_value)
+
+            print(f"From ENV setting '{setting_name}'='{setting_value}'.")
+            settings_json[setting_name] = setting_value
+
+    with open(SETTINGS_FILE_PATH, "w", encoding="utf-8") as f:
+        json.dump(settings_json, f, ensure_ascii=False, indent=4)
+        print("Transmission settings file saved.")
+
+
+if __name__ == "__main__":
+    try:
+        print("Applying transmission env-var-settings mod...")
+        main()
+    except Exception as e:
+        print(f"Failed to apply transmission env-var-settings mod with error: '{e}'.", file=sys.stderr)
+    else:
+        print("Applied transmission env-var-settings mod successfully.")
+    finally:
+        sys.exit(0)

root/etc/s6-overlay/s6-rc.d/init-mod-transmission-env-var-settings/type

@@ -0,0 +1 @@
+oneshot

root/etc/s6-overlay/s6-rc.d/init-mod-transmission-env-var-settings/up

@@ -0,0 +1 @@
+/etc/s6-overlay/s6-rc.d/init-mod-transmission-env-var-settings/run

root/etc/s6-overlay/s6-rc.d/svc-mod-imagename-modname/run

@@ -1,7 +0,0 @@
-#!/usr/bin/with-contenv bash
-
-# This is an example service that would run for the mod
-# It depends on init-services, the baseimage hook for start of all longrun services
-
-exec \
-    s6-setuidgid abc run my app

root/etc/s6-overlay/s6-rc.d/svc-mod-imagename-modname/type

@@ -1 +0,0 @@
-longrun