CI: store and reuse OpenSSH Server docker image used for tests

Supersedes #588
Fixes #665
Closes #685

.github/workflows/ci.yml

@@ -85,10 +85,8 @@ jobs:
           cd bin
           cmake $TOOLCHAIN_OPTION -DCRYPTO_BACKEND=$CRYPTO_BACKEND -DBUILD_SHARED_LIBS=$BUILD_SHARED_LIBS -DENABLE_ZLIB_COMPRESSION=$ENABLE_ZLIB_COMPRESSION ..
           cmake --build .
-          pushd ../tests
-          docker build -t libssh2/openssh_server openssh_server
-          popd
-          CTEST_OUTPUT_ON_FAILURE=1 cmake --build . --target test
+          export OPENSSH_SERVER_IMAGE=ghcr.io/libssh2/ci_tests_openssh_server:$(git rev-parse --short=20 HEAD:../tests/openssh_server)
+          ctest -VV --output-on-failure
           cmake --build . --target package
   fuzzer:
     runs-on: ubuntu-latest

.github/workflows/openssh_server.yml

@@ -0,0 +1,66 @@
+# Copyright (c) 2022 Marc Hoersken
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright notice,
+#   this list of conditions and the following disclaimer in the documentation
+#   and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+name: OpenSSH Server Docker Image
+
+on:
+  push:
+    branches: [ master ]
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: actions/checkout@v1
+
+      - shell: bash
+        id: hash
+        run: echo "::set-output name=hash::$(git rev-parse --short=20 HEAD:tests/openssh_server)"
+
+      - shell: bash
+        id: poll
+        run: docker manifest inspect ghcr.io/${{ github.repository_owner }}/ci_tests_openssh_server:${{ steps.hash.outputs.hash }}
+        continue-on-error: true
+
+      - uses: docker/metadata-action@v3
+        id: meta
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/ci_tests_openssh_server
+          tags: |
+            type=raw,value=${{ steps.hash.outputs.hash }}
+        if: ${{ steps.poll.outcome == 'failure' }}
+
+      - uses: docker/build-push-action@v2
+        with:
+          context: ./tests/openssh_server
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+        if: ${{ steps.poll.outcome == 'failure' }}

.travis.yml

@@ -112,10 +112,9 @@ script:
   - |
       if [ "$B" = "cmake" ]; then
         mkdir bin
-        cd tests
-        docker build -t libssh2/openssh_server openssh_server
-        cd ../bin
-        cmake $TOOLCHAIN_OPTION -DCRYPTO_BACKEND=$CRYPTO_BACKEND -DBUILD_SHARED_LIBS=$BUILD_SHARED_LIBS -DENABLE_ZLIB_COMPRESSION=$ENABLE_ZLIB_COMPRESSION .. && cmake --build . && CTEST_OUTPUT_ON_FAILURE=1 cmake --build . --target test && cmake --build . --target package
+        cd bin
+        export OPENSSH_SERVER_IMAGE=ghcr.io/libssh2/ci_tests_openssh_server:$(git rev-parse --short=20 HEAD:../tests/openssh_server)
+        cmake $TOOLCHAIN_OPTION -DCRYPTO_BACKEND=$CRYPTO_BACKEND -DBUILD_SHARED_LIBS=$BUILD_SHARED_LIBS -DENABLE_ZLIB_COMPRESSION=$ENABLE_ZLIB_COMPRESSION .. && cmake --build . && ctest -VV --output-on-failure && cmake --build . --target package
       fi
   - |
       if [ "$B" = "fuzzer" ]; then

appveyor.yml

@@ -103,8 +103,8 @@ before_test:
       }
 
 test_script:
-  - ps: cd _builds
-  - ps: ctest -VV -C $($env:CONFIGURATION) --output-on-failure
+  - ps: $env:OPENSSH_SERVER_IMAGE=[string] (& bash -c "echo ghcr.io/libssh2/ci_tests_openssh_server:$(git rev-parse --short=20 HEAD:tests/openssh_server)")
+  - ps: cd _builds; ctest -VV -C $($env:CONFIGURATION) --output-on-failure
 
 on_failure:
   - ps: if(Test-Path _builds/CMakeFiles/CMakeOutput.log) { cat _builds/CMakeFiles/CMakeOutput.log }

tests/openssh_fixture.c

@@ -143,8 +143,26 @@ static int run_command(char **output, const char *command, ...)
     return ret;
 }
 
+static const char *openssh_server_image(void)
+{
+    return getenv("OPENSSH_SERVER_IMAGE");
+}
+
 static int build_openssh_server_docker_image(void)
 {
+    const char *container_image_name = openssh_server_image();
+    if(container_image_name != NULL) {
+        int ret = run_command(NULL, "docker pull --quiet %s",
+                              container_image_name);
+        if(ret == 0) {
+            ret = run_command(NULL, "docker tag %s libssh2/openssh_server",
+                              container_image_name);
+            if(ret == 0) {
+                return ret;
+            }
+        }
+    }
+
     return run_command(NULL, "docker build --quiet "
                              "-t libssh2/openssh_server "
                              "openssh_server");
@@ -164,11 +182,10 @@ static int start_openssh_server(char **container_id_out)
                            "libssh2/openssh_server",
                            container_host_port);
     }
-    else {
-        return run_command(container_id_out,
-                           "docker run --rm -d -p 22 "
-                           "libssh2/openssh_server");
-    }
+
+    return run_command(container_id_out,
+                       "docker run --rm -d -p 22 "
+                       "libssh2/openssh_server");
 }
 
 static int stop_openssh_server(char *container_id)