check if version is latest or not

.github/workflows/ci.yml

@@ -84,10 +84,13 @@ jobs:
         timeout-minutes: 10
   check:
     runs-on: ubuntu-latest
+    outputs:
+      is-latest: ${{ steps.check.outputs.is-latest }}
     steps:
       - uses: actions/checkout@v3
       - uses: ./.github/actions/setup-rust
       - run: cargo xtask ci-job check
+        id: check
         shell: bash
   generate-matrix:
     runs-on: ubuntu-latest
@@ -256,6 +259,7 @@ jobs:
           TARGET: ${{ matrix.target }}
           SUB: ${{ matrix.sub }}
           LABELS: ${{ steps.docker-meta.outputs.labels }}
+          IS_LATEST: ${{ needs.check.outputs.is-latest || 'false' }}
         shell: bash
       - name: Set Docker image for test
         if: steps.prepare-meta.outputs.has-image
@@ -302,6 +306,7 @@ jobs:
           TARGET: ${{ matrix.target }}
           SUB: ${{ matrix.sub }}
           LABELS: ${{ steps.docker-meta.outputs.labels }}
+          IS_LATEST: ${{ needs.check.outputs.is-latest || 'false' }}
         shell: bash
 
   publish:

xtask/Cargo.toml

@@ -19,3 +19,4 @@ serde = { version = "1", features = ["derive"] }
 serde_yaml = "0.8"
 serde_json = "1.0"
 once_cell = "1.12"
+semver = "1"

xtask/src/build_docker_image.rs

@@ -11,6 +11,8 @@ pub struct BuildDockerImage {
     ref_type: Option<String>,
     #[clap(long, hide = true, env = "GITHUB_REF_NAME")]
     ref_name: Option<String>,
+    #[clap(long, hide = true, env = "IS_LATEST")]
+    is_latest: Option<bool>,
     /// Specify a tag to use instead of the derived one, eg `local`
     #[clap(long)]
     tag: Option<String>,
@@ -80,6 +82,7 @@ pub fn build_docker_image(
     BuildDockerImage {
         ref_type,
         ref_name,
+        is_latest,
         tag: tag_override,
         repository,
         labels,
@@ -164,6 +167,7 @@ pub fn build_docker_image(
                 &repository,
                 ref_type,
                 ref_name,
+                is_latest.unwrap_or_default(),
                 &version,
             )?),
             _ => {
@@ -276,6 +280,7 @@ pub fn determine_image_name(
     repository: &str,
     ref_type: &str,
     ref_name: &str,
+    is_latest: bool,
     version: &str,
 ) -> cross::Result<Vec<String>> {
     let mut tags = vec![];
@@ -289,8 +294,7 @@ pub fn determine_image_name(
             }
             tags.push(target.image_name(repository, version));
             // Check for unstable releases, tag stable releases as `latest`
-            if !version.contains('-') {
-                // TODO: Don't tag if version is older than currently released version.
+            if is_latest {
                 tags.push(target.image_name(repository, "latest"))
             }
         }

xtask/src/ci.rs

@@ -1,5 +1,5 @@
 use clap::Subcommand;
-use cross::CargoMetadata;
+use cross::{cargo_command, CargoMetadata, CommandExt};
 
 #[derive(Subcommand, Debug)]
 pub enum CiJob {
@@ -59,6 +59,7 @@ pub fn ci(args: CiJob, metadata: CargoMetadata) -> cross::Result<()> {
                     cross::docker::CROSS_IMAGE,
                     &ref_type,
                     &ref_name,
+                    false,
                     &version,
                 )?[0],
             );
@@ -68,9 +69,28 @@ pub fn ci(args: CiJob, metadata: CargoMetadata) -> cross::Result<()> {
             }
         }
         CiJob::Check { ref_type, ref_name } => {
-            let version = cross_meta.version.clone();
-            if ref_type == "tag" && ref_name.starts_with('v') && ref_name != format!("v{version}") {
-                eyre::bail!("a version tag was published, but the tag does not match the current version in Cargo.toml");
+            let version = semver::Version::parse(&cross_meta.version)?;
+            if ref_type == "tag" {
+                if ref_name.starts_with('v') && ref_name != format!("v{version}") {
+                    eyre::bail!("a version tag was published, but the tag does not match the current version in Cargo.toml");
+                }
+                let search = cargo_command()
+                    .args(&["search", "--limit", "1"])
+                    .arg("cross")
+                    .run_and_get_stdout(true)?;
+                let (cross, rest) = search
+                    .split_once(" = ")
+                    .ok_or_else(|| eyre::eyre!("cargo search failed"))?;
+                assert_eq!(cross, "cross");
+                // Note: this version includes pre-releases.
+                let latest_version = semver::Version::parse(
+                    rest.split('"')
+                        .nth(1)
+                        .ok_or_else(|| eyre::eyre!("cargo search returned unexpected data"))?,
+                )?;
+                if version >= latest_version && version.pre.is_empty() {
+                    gha_output("is-latest", "true")
+                }
             }
         }
     }