TUN-6724: Migrate to sentry-go from raven-go

vendor/github.com/getsentry/sentry-go/util.go

@@ -0,0 +1,91 @@
+package sentry
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	exec "golang.org/x/sys/execabs"
+)
+
+func uuid() string {
+	id := make([]byte, 16)
+	// Prefer rand.Read over rand.Reader, see https://go-review.googlesource.com/c/go/+/272326/.
+	_, _ = rand.Read(id)
+	id[6] &= 0x0F // clear version
+	id[6] |= 0x40 // set version to 4 (random uuid)
+	id[8] &= 0x3F // clear variant
+	id[8] |= 0x80 // set to IETF variant
+	return hex.EncodeToString(id)
+}
+
+func fileExists(fileName string) bool {
+	_, err := os.Stat(fileName)
+	return err == nil
+}
+
+// monotonicTimeSince replaces uses of time.Now() to take into account the
+// monotonic clock reading stored in start, such that duration = end - start is
+// unaffected by changes in the system wall clock.
+func monotonicTimeSince(start time.Time) (end time.Time) {
+	return start.Add(time.Since(start))
+}
+
+// nolint: deadcode, unused
+func prettyPrint(data interface{}) {
+	dbg, _ := json.MarshalIndent(data, "", "  ")
+	fmt.Println(string(dbg))
+}
+
+// defaultRelease attempts to guess a default release for the currently running
+// program.
+func defaultRelease() (release string) {
+	// Return first non-empty environment variable known to hold release info, if any.
+	envs := []string{
+		"SENTRY_RELEASE",
+		"HEROKU_SLUG_COMMIT",
+		"SOURCE_VERSION",
+		"CODEBUILD_RESOLVED_SOURCE_VERSION",
+		"CIRCLE_SHA1",
+		"GAE_DEPLOYMENT_ID",
+		"GITHUB_SHA",             // GitHub Actions - https://help.github.com/en/actions
+		"COMMIT_REF",             // Netlify - https://docs.netlify.com/
+		"VERCEL_GIT_COMMIT_SHA",  // Vercel - https://vercel.com/
+		"ZEIT_GITHUB_COMMIT_SHA", // Zeit (now known as Vercel)
+		"ZEIT_GITLAB_COMMIT_SHA",
+		"ZEIT_BITBUCKET_COMMIT_SHA",
+	}
+	for _, e := range envs {
+		if release = os.Getenv(e); release != "" {
+			Logger.Printf("Using release from environment variable %s: %s", e, release)
+			return release
+		}
+	}
+
+	// Derive a version string from Git. Example outputs:
+	// 	v1.0.1-0-g9de4
+	// 	v2.0-8-g77df-dirty
+	// 	4f72d7
+	cmd := exec.Command("git", "describe", "--long", "--always", "--dirty")
+	b, err := cmd.Output()
+	if err != nil {
+		// Either Git is not available or the current directory is not a
+		// Git repository.
+		var s strings.Builder
+		fmt.Fprintf(&s, "Release detection failed: %v", err)
+		if err, ok := err.(*exec.ExitError); ok && len(err.Stderr) > 0 {
+			fmt.Fprintf(&s, ": %s", err.Stderr)
+		}
+		Logger.Print(s.String())
+		Logger.Print("Some Sentry features will not be available. See https://docs.sentry.io/product/releases/.")
+		Logger.Print("To stop seeing this message, pass a Release to sentry.Init or set the SENTRY_RELEASE environment variable.")
+		return ""
+	}
+	release = strings.TrimSpace(string(b))
+	Logger.Printf("Using release from Git: %s", release)
+	return release
+}