feat: add version to footer (#882)

* Add endpoint for getting build info

* Add build info XService

* Add version with link to page footer

Partially addresses #376.

* Lift buildinfo package

cli/buildinfo/buildinfo.go

@@ -1,83 +0,0 @@
-package buildinfo
-
-import (
-	"path"
-	"runtime/debug"
-	"sync"
-	"time"
-
-	"golang.org/x/mod/semver"
-)
-
-var (
-	buildInfo      *debug.BuildInfo
-	buildInfoValid bool
-	readBuildInfo  sync.Once
-
-	// Injected with ldflags at build!
-	tag string
-)
-
-// Version returns the semantic version of the build.
-// Use golang.org/x/mod/semver to compare versions.
-func Version() string {
-	revision, valid := revision()
-	if valid {
-		revision = "+" + revision[:7]
-	}
-	if tag == "" {
-		return "v0.0.0-devel" + revision
-	}
-	if semver.Build(tag) == "" {
-		tag += revision
-	}
-	return "v" + tag
-}
-
-// ExternalURL returns a URL referencing the current Coder version.
-// For production builds, this will link directly to a release.
-// For development builds, this will link to a commit.
-func ExternalURL() string {
-	repo := "https://github.com/coder/coder"
-	revision, valid := revision()
-	if !valid {
-		return repo
-	}
-	return path.Join(repo, "commit", revision)
-}
-
-// Time returns when the Git revision was published.
-func Time() (time.Time, bool) {
-	value, valid := find("vcs.time")
-	if !valid {
-		return time.Time{}, false
-	}
-	parsed, err := time.Parse(time.RFC3339, value)
-	if err != nil {
-		panic("couldn't parse time: " + err.Error())
-	}
-	return parsed, true
-}
-
-// revision returns the Git hash of the build.
-func revision() (string, bool) {
-	return find("vcs.revision")
-}
-
-// find panics if a setting with the specific key was not
-// found in the build info.
-func find(key string) (string, bool) {
-	readBuildInfo.Do(func() {
-		buildInfo, buildInfoValid = debug.ReadBuildInfo()
-	})
-	if !buildInfoValid {
-		panic("couldn't read build info")
-	}
-	for _, setting := range buildInfo.Settings {
-		if setting.Key != key {
-			continue
-		}
-		return setting.Value, true
-	}
-	return "", false
-}

cli/buildinfo/buildinfo_test.go

@@ -1,32 +0,0 @@
-package buildinfo_test
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/require"
-	"golang.org/x/mod/semver"
-
-	"github.com/coder/coder/cli/buildinfo"
-)
-
-func TestBuildInfo(t *testing.T) {
-	t.Parallel()
-	t.Run("Version", func(t *testing.T) {
-		t.Parallel()
-		version := buildinfo.Version()
-		require.True(t, semver.IsValid(version))
-		prerelease := semver.Prerelease(version)
-		require.Equal(t, "-devel", prerelease)
-		require.Equal(t, "v0", semver.Major(version))
-	})
-	t.Run("ExternalURL", func(t *testing.T) {
-		t.Parallel()
-		require.Equal(t, "https://github.com/coder/coder", buildinfo.ExternalURL())
-	})
-	// Tests don't include Go build info.
-	t.Run("NoTime", func(t *testing.T) {
-		t.Parallel()
-		_, valid := buildinfo.Time()
-		require.False(t, valid)
-	})
-}

cli/root.go

@@ -11,7 +11,7 @@ import (
 	"github.com/mattn/go-isatty"
 	"github.com/spf13/cobra"
 
-	"github.com/coder/coder/cli/buildinfo"
+	"github.com/coder/coder/buildinfo"
 	"github.com/coder/coder/cli/cliui"
 	"github.com/coder/coder/cli/config"
 	"github.com/coder/coder/codersdk"