Migrate transmission containers from Dockerfile to Dagger builds

Replace Dockerfiles with native container.py for both transmission and
transmission-exporter. Updates base images (Alpine 3.23, Python 3.14),
pins uv to 0.11.6 instead of :latest.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

containers/transmission-exporter/Dockerfile

@@ -1,25 +0,0 @@
-# Transmission Prometheus exporter - collect-on-scrape, no polling loop
-# uv run --script handles dependency resolution at runtime
-
-ARG CONTAINER_APP_VERSION=1.0.1
-
-FROM python:3.13-alpine3.23
-
-ARG CONTAINER_APP_VERSION
-LABEL org.opencontainers.image.title="Transmission Exporter"
-LABEL org.opencontainers.image.description="Prometheus exporter for Transmission BitTorrent client"
-LABEL org.opencontainers.image.version="${CONTAINER_APP_VERSION}"
-LABEL org.opencontainers.image.source="https://forge.eblu.me/eblume/blumeops"
-LABEL org.opencontainers.image.vendor="blumeops"
-
-COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv
-
-ENV PYTHONUNBUFFERED=1
-ENV UV_CACHE_DIR=/tmp/uv-cache
-
-WORKDIR /app
-COPY exporter.py .
-
-EXPOSE 19091
-USER 65534:65534
-CMD ["uv", "run", "--script", "/app/exporter.py"]

containers/transmission-exporter/container.py

@@ -0,0 +1,37 @@
+"""Transmission Prometheus exporter — native Dagger build.
+
+Minimal collect-on-scrape exporter using uv to resolve deps at runtime.
+"""
+
+import dagger
+from dagger import dag
+
+from blumeops.containers import oci_labels
+
+VERSION = "1.0.1"
+
+PYTHON_BASE = "python:3.14-alpine3.23"
+UV_IMAGE = "ghcr.io/astral-sh/uv:0.11.6"
+
+
+async def build(src: dagger.Directory) -> dagger.Container:
+    ctr = (
+        dag.container()
+        .from_(PYTHON_BASE)
+        .with_file("/usr/local/bin/uv", dag.container().from_(UV_IMAGE).file("/uv"))
+        .with_env_variable("PYTHONUNBUFFERED", "1")
+        .with_env_variable("UV_CACHE_DIR", "/tmp/uv-cache")
+        .with_workdir("/app")
+        .with_file(
+            "/app/exporter.py", src.file("containers/transmission-exporter/exporter.py")
+        )
+        .with_exposed_port(19091)
+        .with_user("65534:65534")
+        .with_default_args(args=["uv", "run", "--script", "/app/exporter.py"])
+    )
+    return oci_labels(
+        ctr,
+        title="Transmission Exporter",
+        description="Prometheus exporter for Transmission BitTorrent client",
+        version=VERSION,
+    )

containers/transmission/Dockerfile

@@ -1,39 +0,0 @@
-# Transmission BitTorrent daemon
-# Simpler alternative to linuxserver image
-
-ARG CONTAINER_APP_VERSION=4.1.1-r1
-
-FROM alpine:3.22
-
-ARG CONTAINER_APP_VERSION
-ARG TRANSMISSION_VERSION=${CONTAINER_APP_VERSION}
-
-LABEL org.opencontainers.image.title="Transmission"
-LABEL org.opencontainers.image.description="Transmission BitTorrent daemon"
-LABEL org.opencontainers.image.version="${CONTAINER_APP_VERSION}"
-LABEL org.opencontainers.image.source="https://forge.eblu.me/eblume/blumeops"
-LABEL org.opencontainers.image.vendor="blumeops"
-
-# Transmission 4.1.x is only in edge; base OS stays on stable 3.22
-RUN apk add --no-cache \
-    --repository=https://dl-cdn.alpinelinux.org/alpine/edge/community \
-    transmission-daemon=${TRANSMISSION_VERSION} \
-    transmission-cli=${TRANSMISSION_VERSION} \
-    transmission-remote=${TRANSMISSION_VERSION} \
-    && apk add --no-cache \
-    bash \
-    curl \
-    tzdata \
-    su-exec
-
-# Create directories (user is created dynamically by start.sh based on PUID/PGID)
-RUN mkdir -p /config /downloads/complete /downloads/incomplete
-
-COPY start.sh /start.sh
-RUN chmod +x /start.sh
-
-EXPOSE 9091 51413/tcp 51413/udp
-
-VOLUME ["/config", "/downloads"]
-
-ENTRYPOINT ["/start.sh"]

containers/transmission/container.py

@@ -0,0 +1,49 @@
+"""Transmission BitTorrent daemon — native Dagger build.
+
+Alpine-based container with transmission-daemon from edge repo.
+Includes start.sh for dynamic PUID/PGID user creation at runtime.
+"""
+
+import dagger
+from dagger import dag
+
+from blumeops.containers import oci_labels
+
+VERSION = "4.1.1-r1"
+
+ALPINE_BASE = "alpine:3.23"
+
+
+async def build(src: dagger.Directory) -> dagger.Container:
+    ctr = (
+        dag.container()
+        .from_(ALPINE_BASE)
+        # Transmission 4.1.x is only in edge community
+        .with_exec(
+            [
+                "apk",
+                "add",
+                "--no-cache",
+                "--repository=https://dl-cdn.alpinelinux.org/alpine/edge/community",
+                f"transmission-daemon={VERSION}",
+                f"transmission-cli={VERSION}",
+                f"transmission-remote={VERSION}",
+            ]
+        )
+        .with_exec(["apk", "add", "--no-cache", "bash", "curl", "tzdata", "su-exec"])
+        .with_exec(
+            ["mkdir", "-p", "/config", "/downloads/complete", "/downloads/incomplete"]
+        )
+        .with_file("/start.sh", src.file("containers/transmission/start.sh"))
+        .with_exec(["chmod", "+x", "/start.sh"])
+        .with_exposed_port(9091)
+        .with_exposed_port(51413, protocol=dagger.NetworkProtocol.TCP)
+        .with_exposed_port(51413, protocol=dagger.NetworkProtocol.UDP)
+        .with_default_args(args=["/start.sh"])
+    )
+    return oci_labels(
+        ctr,
+        title="Transmission",
+        description="Transmission BitTorrent daemon",
+        version=VERSION,
+    )

docs/changelog.d/dagger-transmission-containers.infra.md

@@ -0,0 +1 @@
+Migrate transmission and transmission-exporter containers from Dockerfile to native Dagger builds (`container.py`). Updates base images to Alpine 3.23 and Python 3.14, pins uv to 0.11.6.

service-versions.yaml

@@ -196,13 +196,13 @@ services:
 
   - name: transmission
     type: argocd
-    last-reviewed: 2026-03-04
+    last-reviewed: 2026-04-15
     current-version: "4.1.1-r1"
     upstream-source: https://github.com/transmission/transmission/releases
 
   - name: transmission-exporter
     type: argocd
-    last-reviewed: 2026-03-05
+    last-reviewed: 2026-04-15
     current-version: "1.0.1"
     upstream-source: null
     notes: Homegrown Python exporter, no upstream