distroless image: minor changes

.github/workflows/docker.yml

@@ -21,10 +21,13 @@ jobs:
         docker_pkg:
           - debian
           - alpine
-          - distroless
         optional_deps:
           - true
           - false
+        include:
+          - os: ubuntu-latest
+            docker_pkg: distroless
+            optional_deps: false
     steps:
       - name: Checkout
         uses: actions/checkout@v2
@@ -65,9 +68,9 @@ jobs:
             VERSION="${VERSION}-alpine"
             VERSION_SLIM="${VERSION}-slim"
             DOCKERFILE=Dockerfile.alpine
-          fi
-          if [[ $DOCKER_PKG == distroless ]]; then
-            VERSION_SLIM="${VERSION}-distroless-slim"
+          elif [[ $DOCKER_PKG == distroless ]]; then
+            VERSION="${VERSION}-distroless"
+            VERSION_SLIM="${VERSION}-slim"
             DOCKERFILE=Dockerfile.distroless
           fi
           DOCKER_IMAGES=("drakkan/sftpgo" "ghcr.io/drakkan/sftpgo")
@@ -89,9 +92,11 @@ jobs:
                 TAGS_SLIM="${TAGS_SLIM},${DOCKER_IMAGE}:slim"
               elif [[ $DOCKER_PKG == distroless ]]; then
                 if [[ -n $MAJOR && -n $MINOR ]]; then
+                  TAGS="${TAGS},${DOCKER_IMAGE}:${MINOR}-distroless,${DOCKER_IMAGE}:${MAJOR}-distroless"
                   TAGS_SLIM="${TAGS_SLIM},${DOCKER_IMAGE}:${MINOR}-distroless-slim,${DOCKER_IMAGE}:${MAJOR}-distroless-slim"
                 fi
-                TAGS_SLIM="${TAGS_SLIM},${DOCKER_IMAGE}:slim"
+                TAGS="${TAGS},${DOCKER_IMAGE}:distroless"
+                TAGS_SLIM="${TAGS_SLIM},${DOCKER_IMAGE}:distroless-slim"
               else
                 if [[ -n $MAJOR && -n $MINOR ]]; then
                   TAGS="${TAGS},${DOCKER_IMAGE}:${MINOR}-alpine,${DOCKER_IMAGE}:${MAJOR}-alpine"
@@ -104,14 +109,9 @@ jobs:
           done
 
           if [[ $OPTIONAL_DEPS == true ]]; then
-            if [[ $DOCKER_PKG != distroless ]]; then
-              echo ::set-output name=version::${VERSION}
-              echo ::set-output name=tags::${TAGS}
-              echo ::set-output name=full::true
-            else
-              # skip for distroless no slim
-              echo ::set-output name=skip_build_and_push_step::true
-            fi
+            echo ::set-output name=version::${VERSION}
+            echo ::set-output name=tags::${TAGS}
+            echo ::set-output name=full::true
           else
             echo ::set-output name=version::${VERSION_SLIM}
             echo ::set-output name=tags::${TAGS_SLIM}
@@ -167,6 +167,4 @@ jobs:
             org.opencontainers.image.version=${{ steps.info.outputs.version }}
             org.opencontainers.image.created=${{ steps.info.outputs.created }}
             org.opencontainers.image.revision=${{ github.sha }}
-            org.opencontainers.image.licenses=${{ fromJson(steps.repo.outputs.result).license.spdx_id }}
-        # skip for distroless no slim
-        if: ${{ steps.info.outputs.skip_build_and_push_step != 'true' }}
+            org.opencontainers.image.licenses=${{ fromJson(steps.repo.outputs.result).license.spdx_id }}

Dockerfile.distroless

@@ -13,8 +13,8 @@ RUN go mod download
 ARG COMMIT_SHA
 
 # This ARG allows to disable some optional features and it might be useful if you build the image yourself.
-# For example you can disable S3 and GCS support like this:
-# --build-arg FEATURES=nos3,nogcs
+# For this variant we disable SQLite support since it requires CGO and so a C runtime which is not installed
+# in distroless/static-* images
 ARG FEATURES=nosqlite
 
 COPY . .
@@ -48,6 +48,10 @@ ENV SFTPGO_LOG_FILE_PATH=""
 # templates and static paths are inside the container
 ENV SFTPGO_HTTPD__TEMPLATES_PATH=/usr/share/sftpgo/templates
 ENV SFTPGO_HTTPD__STATIC_FILES_PATH=/usr/share/sftpgo/static
+# These env vars are required to avoid the following error when calling user.Current():
+# unable to get the current user: user: Current requires cgo or $USER set in environment
+ENV USER=sftpgo
+ENV HOME=/var/lib/sftpgo
 
 WORKDIR /var/lib/sftpgo
 USER 1000:1000

docker/README.md

@@ -88,7 +88,7 @@ The logs are available through Docker's container log:
 docker logs some-sftpgo
 ```
 
-**Note:** [distroless](../Dockerfile.distroless) image contains only application and its runtime dependencies. Shell access is not available on this image.
+**Note:** [distroless](../Dockerfile.distroless) image contains only a statically linked sftpgo binary and its minimal runtime dependencies. Shell is not available on this image.
 
 ### Where to Store Data
 
@@ -169,11 +169,11 @@ RUN chown -R 1100:1100 /etc/sftpgo && chown 1100:1100 /var/lib/sftpgo /srv/sftpg
 USER 1100:1100
 ```
 
-**Note:** the above Dockerfile will not work for [distroless](../Dockerfile.distroless) image since the `chown` command is not available there.
+**Note:** the above Dockerfile will not work if you use the [distroless](../Dockerfile.distroless) image as base since the `chown` command is not available there.
 
 ## Image Variants
 
-The `sftpgo` images comes in many flavors, each designed for a specific use case. The `edge` and `edge-alpine`tags are updated after each new commit.
+The `sftpgo` images comes in many flavors, each designed for a specific use case. The `edge`, `edge-slim`, `edge-alpine`, `edge-alpine-slim` and `edge-distroless-slim` tags are updated after each new commit.
 
 ### `sftpgo:<version>`
 
@@ -189,9 +189,10 @@ This variant is highly recommended when final image size being as small as possi
 
 This image is based on the popular [Distroless project](https://github.com/GoogleContainerTools/distroless). We use the latest Debian based distroless image as base.
 
-Distroless image contains only application and its runtime dependencies and so it doesn't allow shell access (no shell is installed).
-SQLite support is disabled since it requires CGO and so a C runtime. We use a statically linked SFTPGo binary here.
-The default data-provider is `bolt`, all the supported data providers expect `sqlite` work.
+Distroless variant contains only a statically linked sftpgo binary and its minimal runtime dependencies and so it doesn't allow shell access (no shell is installed).
+SQLite support is disabled since it requires CGO and so a C runtime which is not installed.
+The default data provider is `bolt`, all the supported data providers expect `sqlite` work.
+We only provide the slim variant and so the optional `git` and `rsync` dependencies are not available.
 
 ### `sftpgo:<suite>-slim`