Add network container tests

.github/workflows/main.yml

@@ -34,6 +34,7 @@ jobs:
       CARGO_PROFILE_DEV_DEBUG: 1
       CARGO_PROFILE_TEST_DEBUG: 1
       CARGO_INCREMENTAL: 0
+      CARGO_PUBLIC_NETWORK_TESTS: 1
     strategy:
       matrix:
         include:
@@ -77,6 +78,9 @@ jobs:
     - run: sudo apt update -y && sudo apt install gcc-multilib libsecret-1-0 libsecret-1-dev -y
       if: matrix.os == 'ubuntu-latest'
     - run: rustup component add rustfmt || echo "rustfmt not available"
+    - name: Configure extra test environment
+      run: echo CARGO_CONTAINER_TESTS=1 >> $GITHUB_ENV
+      if: matrix.os == 'ubuntu-latest'
 
     # Deny warnings on CI to avoid warnings getting into the codebase.
     - run: cargo test --features 'deny-warnings'

crates/cargo-test-macro/src/lib.rs

@@ -55,6 +55,23 @@ pub fn cargo_test(attr: TokenStream, item: TokenStream) -> TokenStream {
                     "does not work on windows-gnu"
                 );
             }
+            "container_test" => {
+                // These tests must be opt-in because they require docker.
+                set_ignore!(
+                    option_env!("CARGO_CONTAINER_TESTS").is_none(),
+                    "CARGO_CONTAINER_TESTS must be set"
+                );
+            }
+            "public_network_test" => {
+                // These tests must be opt-in because they touch the public
+                // network. The use of these should be **EXTREMELY RARE**, and
+                // should only touch things which would nearly certainly work
+                // in CI (like github.com).
+                set_ignore!(
+                    option_env!("CARGO_PUBLIC_NETWORK_TESTS").is_none(),
+                    "CARGO_PUBLIC_NETWORK_TESTS must be set"
+                );
+            }
             "nightly" => {
                 requires_reason = true;
                 set_ignore!(is_not_nightly, "requires nightly");

crates/cargo-test-support/build.rs

@@ -3,4 +3,5 @@ fn main() {
         "cargo:rustc-env=NATIVE_ARCH={}",
         std::env::var("TARGET").unwrap()
     );
+    println!("cargo:rerun-if-changed=build.rs");
 }

crates/cargo-test-support/containers/apache/Dockerfile

@@ -0,0 +1,26 @@
+FROM httpd:2.4-alpine
+
+RUN apk add --no-cache git git-daemon openssl
+
+COPY bar /repos/bar
+WORKDIR /repos/bar
+RUN git config --global user.email "testuser@example.com" &&\
+    git config --global user.name "Test User" &&\
+    git init -b master . &&\
+    git add Cargo.toml src &&\
+    git commit -m "Initial commit" &&\
+    mv .git ../bar.git &&\
+    cd ../bar.git &&\
+    git config --bool core.bare true &&\
+    rm -rf ../bar
+WORKDIR /
+
+EXPOSE 443
+
+WORKDIR /usr/local/apache2/conf
+COPY httpd-cargo.conf .
+RUN cat httpd-cargo.conf >> httpd.conf
+RUN openssl req -x509 -nodes -days 3650 -newkey rsa:2048 \
+    -keyout server.key -out server.crt \
+    -subj "/emailAddress=webmaster@example.com/C=US/ST=California/L=San Francisco/O=Rust/OU=Cargo/CN=127.0.0.1"
+WORKDIR /

crates/cargo-test-support/containers/apache/bar/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+name = "bar"
+version = "1.0.0"
+edition = "2021"

crates/cargo-test-support/containers/apache/bar/src/lib.rs

@@ -0,0 +1 @@
+// Intentionally blank.

crates/cargo-test-support/containers/apache/httpd-cargo.conf

@@ -0,0 +1,12 @@
+SetEnv GIT_PROJECT_ROOT /repos
+SetEnv GIT_HTTP_EXPORT_ALL
+ScriptAlias /repos /usr/libexec/git-core/git-http-backend/
+LoadModule cgid_module modules/mod_cgid.so
+
+<Files "git-http-backend">
+    Require all granted
+</Files>
+
+Include conf/extra/httpd-ssl.conf
+LoadModule ssl_module modules/mod_ssl.so
+LoadModule socache_shmcb_module modules/mod_socache_shmcb.so

crates/cargo-test-support/containers/sshd/Dockerfile

@@ -0,0 +1,29 @@
+FROM alpine:3.17
+
+RUN apk add --no-cache openssh git
+RUN ssh-keygen -A
+
+RUN addgroup -S testuser && adduser -S testuser -G testuser -s /bin/ash
+# NOTE: Ideally the password should be set to *, but I am uncertain how to do
+# that in alpine. It shouldn't matter since PermitEmptyPasswords is "no".
+RUN passwd -u testuser
+
+RUN mkdir /repos && chown testuser /repos
+COPY --chown=testuser:testuser bar /repos/bar
+USER testuser
+WORKDIR /repos/bar
+RUN git config --global user.email "testuser@example.com" &&\
+    git config --global user.name "Test User" &&\
+    git init -b master . &&\
+    git add Cargo.toml src &&\
+    git commit -m "Initial commit" &&\
+    mv .git ../bar.git &&\
+    cd ../bar.git &&\
+    git config --bool core.bare true &&\
+    rm -rf ../bar
+WORKDIR /
+USER root
+
+EXPOSE 22
+
+ENTRYPOINT ["/usr/sbin/sshd", "-D", "-E", "/var/log/auth.log"]

crates/cargo-test-support/containers/sshd/bar/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+name = "bar"
+version = "1.0.0"
+edition = "2021"

crates/cargo-test-support/containers/sshd/bar/src/lib.rs

@@ -0,0 +1 @@
+// Intentionally blank.