Support nonroot and RO operation

Author: thespad

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/unrar:latest as unrar
+FROM ghcr.io/linuxserver/unrar:latest AS unrar
 
 FROM ghcr.io/linuxserver/baseimage-alpine:edge
 

Dockerfile.aarch64

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/unrar:arm64v8-latest as unrar
+FROM ghcr.io/linuxserver/unrar:arm64v8-latest AS unrar
 
 FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-edge
 

README.md

@@ -83,6 +83,14 @@ Use `HOST_WHITELIST` to enable an list of dns names as host-whitelist. This enab
 
 Use `PEERPORT` to specify the port(s) Transmission should listen on.  This disables random port selection.  This should be the same as the port mapped in your docker configuration.
 
+## Read-Only Operation
+
+This image can be run with a read-only container filesystem. For details please [read the docs](https://docs.linuxserver.io/misc/read-only/).
+
+## Non-Root Operation
+
+This image can be run with a non-root user. For details please [read the docs](https://docs.linuxserver.io/misc/non-root/).
+
 ## Usage
 
 To help you get started creating a container from this image you can either use docker-compose or the docker cli.
@@ -110,8 +118,8 @@ services:
       - HOST_WHITELIST= #optional
     volumes:
       - /path/to/transmission/data:/config
-      - /path/to/downloads:/downloads
-      - /path/to/watch/folder:/watch
+      - /path/to/downloads:/downloads #optional
+      - /path/to/watch/folder:/watch #optional
     ports:
       - 9091:9091
       - 51413:51413
@@ -137,8 +145,8 @@ docker run -d \
   -p 51413:51413 \
   -p 51413:51413/udp \
   -v /path/to/transmission/data:/config \
-  -v /path/to/downloads:/downloads \
-  -v /path/to/watch/folder:/watch \
+  -v /path/to/downloads:/downloads `#optional` \
+  -v /path/to/watch/folder:/watch `#optional` \
   --restart unless-stopped \
   lscr.io/linuxserver/transmission:latest
 ```
@@ -164,6 +172,8 @@ Containers are configured using parameters passed at runtime (such as those abov
 | `-v /config` | Where transmission should store config files and logs. |
 | `-v /downloads` | Local path for downloads. |
 | `-v /watch` | Watch folder for torrent files. |
+| `--read-only=true` | Run container with a read-only filesystem. Please [read the docs](https://docs.linuxserver.io/misc/read-only/). |
+| `--user=1000:1000` | Run container with a non-root user. Please [read the docs](https://docs.linuxserver.io/misc/non-root/). |
 
 ## Environment variables from files (Docker secrets)
 

readme-vars.yml

@@ -16,6 +16,8 @@ param_container_name: "{{ project_name }}"
 param_usage_include_vols: true
 param_volumes:
   - {vol_path: "/config", vol_host_path: "/path/to/{{ project_name }}/data", desc: "Where transmission should store config files and logs."}
+opt_param_usage_include_vols: true
+opt_param_volumes:
   - {vol_path: "/downloads", vol_host_path: "/path/to/downloads", desc: "Local path for downloads."}
   - {vol_path: "/watch", vol_host_path: "/path/to/watch/folder", desc: "Watch folder for torrent files."}
 param_usage_include_ports: true
@@ -32,6 +34,8 @@ opt_param_env_vars:
   - {env_var: "WHITELIST", env_value: "", desc: "Specify an optional list of comma separated ip whitelist. Fills rpc-whitelist setting."}
   - {env_var: "PEERPORT", env_value: "", desc: "Specify an optional port for torrent TCP/UDP connections. Fills peer-port setting."}
   - {env_var: "HOST_WHITELIST", env_value: "", desc: "Specify an optional list of comma separated dns name whitelist. Fills rpc-host-whitelist setting."}
+readonly_supported: true
+nonroot_supported: true
 # application setup block
 app_setup_block_enabled: true
 app_setup_block: |

root/etc/s6-overlay/s6-rc.d/init-transmission-config/run

@@ -1,36 +1,32 @@
 #!/usr/bin/with-contenv bash
 # shellcheck shell=bash
 
-# make folders
-mkdir -p \
-    /downloads/{complete,incomplete} /watch
-
 # copy config
 if [[ ! -f /config/settings.json ]]; then
     cp /defaults/settings.json /config/settings.json
 fi
 
 if [[ -n "${USER}" ]] && [[ -n "${PASS}" ]]; then
     echo -E "$(jq -r '.["rpc-authentication-required"] = true' /config/settings.json)" >/config/settings.json
+    echo -E "$(jq -r --arg user "${USER}" '.["rpc-username"] = $user' /config/settings.json)" >/config/settings.json
+    echo -E "$(jq -r --arg pass "${PASS}" '.["rpc-password"] = $pass' /config/settings.json)" >/config/settings.json
 else
     echo -E "$(jq -r '.["rpc-authentication-required"] = false' /config/settings.json)" >/config/settings.json
 fi
-echo -E "$(jq -r --arg user "${USER}" '.["rpc-username"] = $user' /config/settings.json)" >/config/settings.json
-echo -E "$(jq -r --arg pass "${PASS}" '.["rpc-password"] = $pass' /config/settings.json)" >/config/settings.json
 
 if [[ -n "${WHITELIST}" ]]; then
     echo -E "$(jq -r '.["rpc-whitelist-enabled"] = true' /config/settings.json)" >/config/settings.json
+    echo -E "$(jq -r --arg whitelist "${WHITELIST}" '.["rpc-whitelist"] = $whitelist' /config/settings.json)" >/config/settings.json
 else
     echo -E "$(jq -r '.["rpc-whitelist-enabled"] = false' /config/settings.json)" >/config/settings.json
 fi
-echo -E "$(jq -r --arg whitelist "${WHITELIST}" '.["rpc-whitelist"] = $whitelist' /config/settings.json)" >/config/settings.json
 
 if [[ -n "${HOST_WHITELIST}" ]]; then
     echo -E "$(jq -r '.["rpc-host-whitelist-enabled"] = true' /config/settings.json)" >/config/settings.json
+    echo -E "$(jq -r --arg host_whitelist "${HOST_WHITELIST}" '.["rpc-host-whitelist"] = $host_whitelist' /config/settings.json)" >/config/settings.json
 else
     echo -E "$(jq -r '.["rpc-host-whitelist-enabled"] = false' /config/settings.json)" >/config/settings.json
 fi
-echo -E "$(jq -r --arg host_whitelist "${HOST_WHITELIST}" '.["rpc-host-whitelist"] = $host_whitelist' /config/settings.json)" >/config/settings.json
 
 if [[ -n "${PEERPORT}" ]]; then
     echo -E "$(jq -r --argjson peerport "${PEERPORT}" '.["peer-port"] = $peerport' /config/settings.json)" >/config/settings.json
@@ -41,26 +37,33 @@ if [[ -n "${UMASK}" ]]; then
     echo -E "$(jq -r --arg umask "${UMASK}" '.["umask"] = $umask' /config/settings.json)" >/config/settings.json
 fi
 
-# Handle old theme locations
-mkdir -p {/transmissionic,/combustion-release,/flood-for-transmission,/kettu,/transmission-web-control}
-echo /transmissionic /combustion-release /flood-for-transmission /kettu /transmission-web-control | xargs -n1 ln -s /defaults/index.html
+if [[ -z ${LSIO_NON_ROOT_USER} ]] && [[ -z ${LSIO_READ_ONLY_FS} ]]; then
+    # Handle old theme locations
+    mkdir -p {/transmissionic,/combustion-release,/flood-for-transmission,/kettu,/transmission-web-control}
+    echo /transmissionic /combustion-release /flood-for-transmission /kettu /transmission-web-control | xargs -n1 ln -s /defaults/index.html
+fi
 
-# permissions
-lsiown abc:abc \
-    /config/settings.json
+if [[ -z ${LSIO_NON_ROOT_USER} ]]; then
+    lsiown -R abc:abc \
+        /config
 
-if [[ "$(stat -c '%U' /downloads)" != "abc" ]]; then
-    lsiown abc:abc /downloads
-fi
+    if grep -qe ' /downloads ' /proc/mounts; then
+        if [[ "$(stat -c '%U' /downloads)" != "abc" ]]; then
+            lsiown abc:abc /downloads
+        fi
 
-if [[ "$(stat -c '%U' /downloads/complete)" != "abc" ]]; then
-    lsiown abc:abc /downloads/complete
-fi
+        if [[ "$(stat -c '%U' /downloads/complete)" != "abc" ]]; then
+            lsiown abc:abc /downloads/complete
+        fi
 
-if [[ "$(stat -c '%U' /downloads/incomplete)" != "abc" ]]; then
-    lsiown abc:abc /downloads/incomplete
-fi
+        if [[ "$(stat -c '%U' /downloads/incomplete)" != "abc" ]]; then
+            lsiown abc:abc /downloads/incomplete
+        fi
+    fi
 
-if [[ "$(stat -c '%U' /watch)" != "abc" ]]; then
-    lsiown abc:abc /watch
+    if grep -qe ' /watch ' /proc/mounts; then
+        if [[ "$(stat -c '%U' /watch)" != "abc" ]]; then
+            lsiown abc:abc /watch
+        fi
+    fi
 fi

root/etc/s6-overlay/s6-rc.d/svc-transmission/run

@@ -3,6 +3,12 @@
 
 PORT=$(jq '.["rpc-port"]' /config/settings.json)
 
-s6-notifyoncheck -d -n 300 -w 1000 -c "nc -z localhost ${PORT:-9091}" \
-    s6-setuidgid abc /usr/bin/transmission-daemon \
-    -g /config -f
+if [[ -z ${LSIO_NON_ROOT_USER} ]]; then
+    s6-notifyoncheck -d -n 300 -w 1000 -c "nc -z localhost ${PORT:-9091}" \
+        s6-setuidgid abc /usr/bin/transmission-daemon \
+        -g /config -f
+else
+    s6-notifyoncheck -d -n 300 -w 1000 -c "nc -z localhost ${PORT:-9091}" \
+        /usr/bin/transmission-daemon \
+        -g /config -f
+fi