Use a prebuilt copy of build-manifest

Cargo.toml

@@ -5,6 +5,8 @@ authors = ["Alex Crichton <[email protected]>"]
 license = "MIT OR Apache-2.0"
 edition = "2018"
 
+build = "build.rs"
+
 [dependencies]
 curl = "0.4"
 flate2 = "1"
@@ -21,3 +23,5 @@ sha2 = "0.9.1"
 hex = "0.4.2"
 pgp = "0.7.1"
 chrono = "0.4.19"
+git2 = "0.13.11"
+tempfile = "3.1.0"

README.md

@@ -31,6 +31,13 @@ environment variable while calling `rustup`:
 RUSTUP_DIST_SERVER="http://localhost:9000/static"
 ```
 
+You can also release a specific commit by providing its full hash as the second
+argument of `./run.sh`:
+
+```
+./run.sh nightly 0000000000000000000000000000000000000000
+```
+
 ### Adding additional files to the local release
 
 To save on time and bandwidth, when running a release locally the tooling won't

build.rs

@@ -0,0 +1,10 @@
+fn main() {
+    // Prevent a rebuild every time a non-Rust file is changed.
+    println!("cargo:rerun-if-changed=build.rs");
+
+    // Provide the current target as environment variable.
+    println!(
+        "cargo:rustc-env=TARGET={}",
+        std::env::var("TARGET").unwrap()
+    );
+}

local/run.sh

@@ -13,6 +13,7 @@ RUSTC_DEFAULT_BRANCH="master"
 DOWNLOAD_BASE="https://ci-artifacts.rust-lang.org/rustc-builds"
 # Rustup components to download for each target we want to release.
 DOWNLOAD_COMPONENTS=(
+    "build-manifest"
     "cargo"
     "rust"
     "rust-docs"
@@ -35,6 +36,7 @@ DOWNLOAD_STANDALONE=(
 )
 
 channel="$1"
+override_commit="$2"
 
 # Nightly is on the default branch
 if [[ "${channel}" = "nightly" ]]; then
@@ -46,8 +48,13 @@ fi
 echo "==> overriding files to force promote-release to run"
 mc cp "/src/local/channel-rust-${channel}.toml" "local/static/dist/channel-rust-${channel}.toml" >/dev/null
 
-echo "==> detecting the last rustc commit on branch ${branch}"
-commit="$(git ls-remote "${RUSTC_REPO}" | grep "refs/heads/${branch}" | awk '{print($1)}')"
+if [[ "${override_commit}" = "" ]]; then
+    echo "==> detecting the last rustc commit on branch ${branch}"
+    commit="$(git ls-remote "${RUSTC_REPO}" | grep "refs/heads/${branch}" | awk '{print($1)}')"
+else
+    echo "=>> using overridden commit ${override_commit}"
+    commit="${override_commit}"
+fi
 
 # While the nightly and beta channels have the channel name as the "release" in
 # the archive names, the stable channel uses the actual Rust and Cargo version
@@ -86,8 +93,9 @@ download() {
     file="$1"
     if ! mc stat "local/artifacts/builds/${commit}/${file}" >/dev/null 2>&1; then
         echo "==> copying ${file} from ci-artifacts.rust-lang.org"
-        curl -Lo /tmp/component "${DOWNLOAD_BASE}/${commit}/${file}" --fail
-        mc cp /tmp/component "local/artifacts/builds/${commit}/${file}" >/dev/null
+        if curl -Lo /tmp/component "${DOWNLOAD_BASE}/${commit}/${file}" --fail; then
+            mc cp /tmp/component "local/artifacts/builds/${commit}/${file}" >/dev/null
+        fi
     else
         echo "==> reusing cached ${file}"
     fi
@@ -129,6 +137,10 @@ export PROMOTE_RELEASE_GZIP_COMPRESSION_LEVEL="1" # Faster recompressions
 export PROMOTE_RELEASE_S3_ENDPOINT_URL="http://minio:9000"
 export PROMOTE_RELEASE_SKIP_CLOUDFRONT_INVALIDATIONS="yes"
 export PROMOTE_RELEASE_SKIP_DELETE_BUILD_DIR="yes"
+# Conditional environment variables
+if [[ "${override_commit}" != "" ]]; then
+    export PROMOTE_RELEASE_OVERRIDE_COMMIT="${override_commit}"
+fi
 
 echo "==> starting promote-release"
 /src/target/release/promote-release /persistent/release "${channel}"

prod/Dockerfile

@@ -22,7 +22,7 @@ ENV PATH=/root/.cargo/bin:$PATH
 # caching, and it works by copying the Cargo.{toml,lock} with dummy source code
 # and doing a full build with it.
 WORKDIR /tmp/source
-COPY Cargo.lock Cargo.toml /tmp/source/
+COPY Cargo.lock Cargo.toml build.rs /tmp/source/
 RUN mkdir -p /tmp/source/src && \
     echo "fn main() {}" > /tmp/source/src/main.rs
 RUN cargo fetch

run.sh

@@ -5,11 +5,12 @@
 set -euo pipefail
 IFS=$'\n\t'
 
-if [[ "$#" -ne 1 ]]; then
-    echo "Usage: $0 <channel>"
+if [[ "$#" -lt 1 ]] || [[ "$#" -gt 2 ]]; then
+    echo "Usage: $0 <channel> [commit]"
     exit 1
 fi
 channel="$1"
+override_commit="${2-}"
 
 container_id="$(docker-compose ps -q local)"
 if [[ "${container_id}" == "" ]]; then
@@ -30,4 +31,4 @@ fi
 cargo build --release
 
 # Run the command inside the docker environment.
-docker-compose exec -T local /src/local/run.sh "${channel}"
+docker-compose exec -T local /src/local/run.sh "${channel}" "${override_commit}"