# Release, Go binaries. Runs on version tags (v1.2.3) pushed to main.
#
# The version contract these steps implement is in the `release` skill, and its point is
# that nothing is injected: the toolchain records the tag into the binary's build
# information, so the build simply has to happen at the tag, which the trigger guarantees.
#
# The gates run in their own job, once, before the matrix, minus the race detector: race
# never runs on a push path or a tag, and the local gate raced this tree before the tag
# was cut. Putting the gates inside the matrix would run the whole suite once per target
# on the box that also hosts the forge. Each job validates the tag for itself rather than
# passing a value between jobs, so no workflow feature has to be trusted for the version
# to reach the file name.
name: Release

on:
  push:
    tags: ["v*"]

env:
  # interpres is fetched directly from the self-hosted Gitea, not via
  # proxy.golang.org, and skips the public checksum database.
  GOPRIVATE: sourcedock.dev
  # The box is shared with the forge, so parallelism is bounded on purpose. The gates job
  # needs it most; the build jobs inherit it for their parallel compilation.
  GOFLAGS: -p=1
  GOMAXPROCS: "2"

jobs:
  gates:
    runs-on: fedora
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-go@v6
        with:
          go-version-file: go.mod
          cache: true

      - name: Install Perl
        # Perl for the steps below. The install is a no-op where the package
        # is already present.
        run: dnf install -y perl

      - name: Validate the tag
        env:
          VERSION: ${{ gitea.ref_name }}
        run: |
          perl -e '
            my $v = $ENV{VERSION} // q{};
            $v =~ m{^v[0-9]+\.[0-9]+\.[0-9]+([-+][0-9A-Za-z.-]+)?$}
              or die qq{ERROR: expected a semver tag like v1.2.3, got: $v\n};
            print qq{tag $v\n};
          '

      - name: Build
        run: go build ./...

      - name: Format
        run: |
          perl -e '
            open(my $g, q{-|}, q{gofmt}, q{-l}, q{.}) or die qq{gofmt: $!};
            my @bad = <$g>;
            close($g);
            print @bad;
            exit(@bad ? 1 : 0);
          '

      - name: Vet
        run: go vet ./...

      - name: Modernise
        run: go fix -diff ./...

      - name: Tests
        # Equal to `packages` in the project's justfile: the logic packages hold the
        # floor, and the thin cmd/ would drag it under 80 %.
        run: go test -count=1 -timeout 10m -coverprofile=coverage.out ./internal/...

      - name: Coverage floor
        run: |
          perl -e '
            open(my $c, q{-|}, q{go}, q{tool}, q{cover}, q{-func=coverage.out}) or die qq{cover: $!};
            my $total;
            while (my $l = <$c>) { $total = $1 if $l =~ m{^total:\s+\S+\s+([0-9.]+)%} }
            close($c);
            die qq{no total line in coverage.out\n} unless defined $total;
            printf qq{Total coverage: %s%%\n}, $total;
            exit($total < 80 ? 1 : 0);
          '

  build:
    runs-on: fedora
    timeout-minutes: 25
    needs: gates
    strategy:
      fail-fast: false
      matrix:
        # Portable targets: amd64, arm64, loong64 and riscv64 on Linux; amd64
        # and arm64 on FreeBSD, shipped as cross compiles and runtime untested.
        # freebsd/riscv64 is not a supported port and is not shipped. The build
        # constraints declare linux and freebsd only, so there is no macOS, no
        # Windows, no 32-bit, no wasm. Add GOOS=android GOARCH=arm64 where a
        # project ships Android.
        include:
          - goos: linux
            goarch: amd64
          - goos: linux
            goarch: arm64
          - goos: linux
            goarch: loong64
          - goos: linux
            goarch: riscv64
          - goos: freebsd
            goarch: amd64
          - goos: freebsd
            goarch: arm64
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-go@v6
        with:
          go-version-file: go.mod
          cache: true

      - name: Install Perl
        run: dnf install -y perl

      - name: Validate the tag
        id: version
        env:
          VERSION: ${{ gitea.ref_name }}
        run: |
          perl -e '
            my $v = $ENV{VERSION} // q{};
            $v =~ m{^v[0-9]+\.[0-9]+\.[0-9]+([-+][0-9A-Za-z.-]+)?$}
              or die qq{ERROR: expected a semver tag like v1.2.3, got: $v\n};
            (my $nv = $v) =~ s{^v}{};
            open(my $o, q{>>}, $ENV{GITEA_OUTPUT}) or die qq{GITEA_OUTPUT: $!};
            print $o qq{version_no_v=$nv\n};
            close($o);
            print qq{version $nv\n};
          '

      - name: Build
        env:
          VERSION_NO_V: ${{ steps.version.outputs.version_no_v }}
          GOOS: ${{ matrix.goos }}
          GOARCH: ${{ matrix.goarch }}
          CGO_ENABLED: "0"
        run: |
          # Nothing is injected. The toolchain records the tag into the binary's build
          # information, so the version is right because this build happens at the tag, and
          # there is no path for anyone to get wrong. -s -w only strips symbols.
          go build -ldflags "-s -w" -o "bin/nuntius-${VERSION_NO_V}-${GOOS}-${GOARCH}" ./cmd/server

      # Artefacts stay on v3: v4 and later detect Gitea as GHES and abort.
      - name: Upload artefact
        uses: actions/upload-artifact@v3
        with:
          name: nuntius-${{ matrix.goos }}-${{ matrix.goarch }}
          path: bin/nuntius-${{ steps.version.outputs.version_no_v }}-${{ matrix.goos }}-${{ matrix.goarch }}
          if-no-files-found: error

      - name: Smoke test
        # Only a binary matching the runner can be run here. The check is not that --version
        # exits cleanly but that it reports the tag and nothing more: a build outside version
        # control reports (devel), and a build whose tree was dirty reports +dirty, and both
        # would otherwise be published.
        if: matrix.goos == 'linux' && matrix.goarch == 'amd64'
        env:
          TAG: ${{ gitea.ref_name }}
          BIN: bin/nuntius-${{ steps.version.outputs.version_no_v }}-${{ matrix.goos }}-${{ matrix.goarch }}
        run: |
          perl -e '
            my $want = $ENV{TAG} // die qq{ERROR: no tag\n};
            open(my $bin, q{-|}, $ENV{BIN}, q{--version}) or die qq{$ENV{BIN}: $!};
            my $got = <$bin>;
            close($bin);
            $got = defined $got ? $got : q{};
            chomp $got;
            index($got, $want) >= 0
              or die qq{ERROR: the binary printed "$got", which does not contain $want. Version control was disabled, so there is no recorded version.\n};
            index($got, q{+dirty}) < 0
              or die qq{ERROR: the binary printed "$got". The tree was dirty at build time, which means the checkout was not the tag, or the build artefacts are not ignored.\n};
            print qq{$ENV{BIN} reports $got\n};
          '

  release:
    runs-on: fedora
    timeout-minutes: 15
    needs: build
    permissions:
      # contents: read is required for the checkout: a job that declares any
      # permissions gets a token scoped to exactly those, and releases: write
      # alone leaves the fetch with no read access, which Gitea answers with
      # a 404 "Repository not found". Verified on the instance 2026-09-16.
      contents: read
      releases: write
    steps:
      - uses: actions/checkout@v7

      - name: Download all artefacts
        uses: actions/download-artifact@v3
        with:
          path: dist

      - name: Install Perl
        run: dnf install -y perl

      - name: Extract the CHANGELOG section
        env:
          VERSION: ${{ gitea.ref_name }}
        run: |
          # Each step derives what it needs from the tag, so no value has to travel between
          # jobs.
          perl -e '
            my $v = $ENV{VERSION} // q{};
            $v =~ s{^v}{};
            open(my $vout, q{>}, q{version-no-v.txt}) or die qq{version-no-v.txt: $!};
            print $vout $v;
            close($vout);
            open(my $in, q{<}, q{CHANGELOG.md}) or die qq{CHANGELOG.md: $!};
            my @lines = <$in>;
            close($in);
            my ($start, $end) = (-1, scalar @lines);
            for my $i (0 .. $#lines) {
              if ($start < 0) { $start = $i if $lines[$i] =~ m{^##\s+\[\Q$v\E\]} }
              elsif ($lines[$i] =~ m{^##\s+\[}) { $end = $i; last }
            }
            $start >= 0 or die qq{ERROR: no CHANGELOG section for $v, expected a heading like: ## [$v] - YYYY-MM-DD\n};
            my @body = grep { m{\S} } @lines[$start + 1 .. $end - 1];
            @body or die qq{ERROR: the CHANGELOG section for $v is empty\n};
            open(my $out, q{>}, q{release-body.md}) or die qq{release-body.md: $!};
            print $out @body;
            close($out);
            printf qq{notes for %s: %d lines\n}, $v, scalar @body;
          '

      - name: Build the release request
        run: |
          perl -e '
            open(my $vin, q{<}, q{version-no-v.txt}) or die qq{version-no-v.txt: $!};
            my $v = <$vin>;
            close($vin);
            chomp $v;
            open(my $in, q{<:raw}, q{release-body.md}) or die qq{release-body.md: $!};
            my $body = do { local $/; <$in> };
            close($in);
            # Byte-oriented escaping: JSON is UTF-8, so non-ASCII passes through and only the
            # characters JSON forbids are rewritten.
            $body =~ s/([\\"])/\\$1/g;
            $body =~ s/\t/\\t/g;
            $body =~ s/\r//g;
            $body =~ s/\n/\\n/g;
            $body =~ s/([\x00-\x08\x0b\x0c\x0e-\x1f])/sprintf(q{\u%04x}, ord($1))/ge;
            my $json = sprintf(qq{{"tag_name":"v%s","name":"v%s","body":"%s","draft":false,"prerelease":false}}, $v, $v, $body);
            open(my $out, q{>}, q{release.json}) or die qq{release.json: $!};
            print $out $json;
            close($out);
            print qq{release.json written for v$v\n};
          '

      - name: Create the release
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
          GITEA_SERVER_URL: ${{ gitea.server_url }}
          GITEA_REPOSITORY: ${{ gitea.repository }}
        run: |
          perl -e '
            my @cmd = (q{curl}, q{-sS}, q{-o}, q{response.json}, q{-w}, q{%{http_code}},
              q{-H}, qq{Authorization: token $ENV{GITEA_TOKEN}},
              q{-H}, q{Content-Type: application/json},
              q{-X}, q{POST},
              qq{$ENV{GITEA_SERVER_URL}/api/v1/repos/$ENV{GITEA_REPOSITORY}/releases},
              q{--data-binary}, q{@release.json});
            open(my $curl, q{-|}, @cmd) or die qq{curl: $!};
            my $code = <$curl>;
            my $ok = close($curl);
            my $exit = $? >> 8;
            $code = defined $code ? $code : q{};
            $ok or die qq{ERROR: curl failed (exit $exit) calling $ENV{GITEA_SERVER_URL}\n};
            open(my $r, q{<:raw}, q{response.json}) or die qq{response.json: $!};
            my $body = do { local $/; <$r> };
            close($r);
            $code eq q{201} or die qq{ERROR: the release was not created, HTTP $code: $body\n};
            $body =~ m{"id"\s*:\s*([0-9]+)} or die qq{ERROR: no release id in the response: $body\n};
            open(my $o, q{>}, q{release-id.txt}) or die qq{release-id.txt: $!};
            print $o $1;
            close($o);
            print qq{release id $1\n};
          '

      - name: Upload assets
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
          GITEA_SERVER_URL: ${{ gitea.server_url }}
          GITEA_REPOSITORY: ${{ gitea.repository }}
        run: |
          perl -e '
            open(my $f, q{<}, q{release-id.txt}) or die qq{release-id.txt: $!};
            my $id = <$f>;
            close($f);
            chomp $id;
            my @files = grep { -f $_ } glob(q{dist/*/*});
            @files or die qq{ERROR: no assets under dist/\n};
            my $bad = 0;
            for my $path (@files) {
              (my $name = $path) =~ s{.*/}{};
              my @cmd = (q{curl}, q{-sS}, q{-o}, q{/dev/null}, q{-w}, q{%{http_code}},
                q{-H}, qq{Authorization: token $ENV{GITEA_TOKEN}},
                q{-H}, q{Content-Type: application/octet-stream},
                q{-X}, q{POST}, q{--data-binary}, q{@} . $path,
                qq{$ENV{GITEA_SERVER_URL}/api/v1/repos/$ENV{GITEA_REPOSITORY}/releases/$id/assets?name=$name});
              open(my $curl, q{-|}, @cmd) or die qq{curl: $!};
              my $code = <$curl>;
              my $ok = close($curl);
              my $exit = $? >> 8;
              $code = defined $code ? $code : q{};
              unless ($ok) {
                printf qq{%s: curl failed (exit %d)\n}, $name, $exit;
                $bad = 1;
                next;
              }
              printf qq{%s: HTTP %s\n}, $name, $code;
              $bad = 1 if $code ne q{201};
            }
            exit($bad ? 1 : 0);
          '

      - name: Read the assets back
        # HTTP 201 from the upload alone lies: an attachment can be created
        # and still stored empty. Every asset is read back through the release
        # download route, and the served length must equal the sent file.
        env:
          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
          GITEA_SERVER_URL: ${{ gitea.server_url }}
          GITEA_REPOSITORY: ${{ gitea.repository }}
          TAG: ${{ gitea.ref_name }}
        run: |
          perl -e '
            my @files = grep { -f $_ } glob(q{dist/*/*});
            @files or die qq{ERROR: no assets under dist/\n};
            my $bad = 0;
            for my $path (@files) {
              (my $name = $path) =~ s{.*/}{};
              my @cmd = (q{curl}, q{-sS}, q{-o}, q{asset-readback.bin},
                q{-w}, q{%{http_code} %{size_download}},
                q{-H}, qq{Authorization: token $ENV{GITEA_TOKEN}},
                qq{$ENV{GITEA_SERVER_URL}/$ENV{GITEA_REPOSITORY}/releases/download/$ENV{TAG}/$name});
              open(my $curl, q{-|}, @cmd) or die qq{curl: $!};
              my $line = <$curl>;
              my $ok = close($curl);
              my $exit = $? >> 8;
              unless ($ok) {
                printf qq{%s: curl failed (exit %d)\n}, $name, $exit;
                $bad = 1;
                next;
              }
              $line = defined $line ? $line : q{};
              chomp $line;
              my ($code, $served) = split q{ }, $line;
              $code //= q{};
              $served //= 0;
              my $sent = -s $path;
              unless ($code eq q{200}) {
                printf qq{%s: HTTP %s on read-back\n}, $name, $code;
                $bad = 1;
                next;
              }
              unless ($served == $sent) {
                printf qq{%s: served %s bytes, sent %d\n}, $name, $served, $sent;
                $bad = 1;
                next;
              }
              printf qq{%s: read back, %d bytes\n}, $name, $served;
            }
            exit($bad ? 1 : 0);
          '