ci: build .deb artifact

Uses a small script (`debian/build.sh`) to massage the output of
cargo-c's build into a `.deb` that can be installed on Debian/Ubuntu
systems.

Author: cpu

.github/workflows/artifacts.yaml

@@ -70,6 +70,33 @@ jobs:
           name: rustls-ffi-x86_64-linux-gnu
           path: dist
 
+  linux-deb:
+    name: Linux (x86-64 GNU Deb)
+    runs-on: ubuntu-20.04 # x86_64. Using older Ubuntu for greater GLIBC compat.
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Install stable Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install cargo-c
+        env:
+          LINK: https://github.com/lu-zero/cargo-c/releases/latest/download
+          CARGO_C_FILE: cargo-c-x86_64-unknown-linux-musl.tar.gz
+        run: |
+          curl -L $LINK/$CARGO_C_FILE | tar xz -C ~/.cargo/bin
+
+      - name: Build deb
+        run: ./debian/build.sh
+
+      - name: Upload deb
+        uses: actions/upload-artifact@v4
+        with:
+          name: librustls_0.15.0_amd64.deb
+          path: librustls_0.15.0_amd64.deb
+
   macos-binaries:
     name: MacOS (Arm64 and x86_64)
     runs-on: macos-14 # arm64.

.gitignore

@@ -4,3 +4,5 @@ librustls/cmake-build*
 .idea
 .venv
 .vs
+debian/usr
+debian/DEBIAN

debian/build.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+set -eu
+set -x
+
+cd "$(dirname "$0")"
+
+VERSION=$(sed -n 's/^version = "\(.*\)"$/\1/p' ../librustls/Cargo.toml)
+if [ -z "$VERSION" ]; then
+    echo "Failed to extract version from Cargo.toml" >&2
+    exit 1
+fi
+
+PACKAGE="librustls"
+ARCH="amd64"
+DIST_DIR="/tmp/dist"
+DEB_ROOT="/tmp/deb"
+
+CC=clang CXX=clang cargo cinstall --locked --features cert_compression --release --prefix "${DIST_DIR}"
+
+mkdir -p "${DEB_ROOT}/usr/"{lib,include}
+mkdir -p "${DEB_ROOT}/DEBIAN"
+
+cp -r "${DIST_DIR}/lib/"* "${DEB_ROOT}/usr/lib/"
+cp -r "${DIST_DIR}/include/"* "${DEB_ROOT}/usr/include/"
+
+sed -i "s|prefix=.*|prefix=/usr|" "${DEB_ROOT}/usr/lib/x86_64-linux-gnu/pkgconfig/rustls.pc"
+
+cat > "${DEB_ROOT}/DEBIAN/control" << EOF
+Package: ${PACKAGE}
+Version: ${VERSION}
+Architecture: ${ARCH}
+Maintainer: Daniel McCarney <daniel@binaryparadox.net>
+Description: FFI bindings for the Rustls TLS library
+Section: libs
+Depends: libc6
+Priority: optional
+EOF
+
+cat > "${DEB_ROOT}/DEBIAN/postinst" << EOF
+#!/bin/sh
+set -e
+ldconfig
+EOF
+chmod 755 "${DEB_ROOT}/DEBIAN/postinst"
+
+cd ..
+dpkg-deb --build ${DEB_ROOT} "${PACKAGE}_${VERSION}_${ARCH}.deb"