consolidate version information

.github/scripts/get_product_version.sh

@@ -28,8 +28,7 @@ LDFLAGS="-w -s"
 if [[ "$EXPERIMENTS_ENABLED" == 1 ]]; then
 LDFLAGS="${LDFLAGS} -X 'main.experimentsAllowed=yes'"
 fi
-LDFLAGS="${LDFLAGS} -X 'github.com/hashicorp/terraform/version.Version=${BASE_VERSION}'"
-LDFLAGS="${LDFLAGS} -X 'github.com/hashicorp/terraform/version.Prerelease=${PRERELEASE}'"
+LDFLAGS="${LDFLAGS} -X 'github.com/hashicorp/terraform/version.dev=no'"
 
 echo "Building Terraform CLI ${VERSION}"
 if [[ "$EXPERIMENTS_ENABLED" == 1 ]]; then

BUILDING.md

@@ -0,0 +1,42 @@
+# Building from Source
+
+Pre-built binaries are available for download for a variety of supported platforms through the [HashiCorp Releases website](https://releases.hashicorp.com/terraform/). 
+
+However, if you'd like to build Terraform yourself, you can do so using the Go build toolchain and the options specified in this document.
+
+## Prerequisites
+
+1. Ensure you've installed the Go language version specified in [`.go-version`](https://github.com/hashicorp/terraform/blob/main/.go-version).
+2. Clone this repository to a location of your choice.
+
+## Terraform Build Options
+
+Terraform accepts certain options passed using `ldflags` at build time which control the behavior of the resulting binary.
+
+### Dev Version Reporting
+
+Terraform will include a `-dev` flag when reporting its own version (ex: 1.5.0-dev) unless `version.dev` is set to `no`:
+
+```
+go build -ldflags "-w -s -X 'github.com/hashicorp/terraform/version.dev=no'" -o bin/ .
+```
+
+### Experimental Features
+
+Experimental features of Terraform will be disabled unless `main.experimentsAllowed` is set to `yes`:
+
+```
+go build -ldflags "-w -s -X 'main.experimentsAllowed=yes'" -o bin/ .
+```
+
+In the official build process for Terraform, experiments are only allowed in alpha release builds. We recommend that third-party distributors follow that convention in order to reduce user confusion.
+
+## Go Options
+
+For the most part, the Terraform release process relies on the Go toolchain defaults for the target operating system and processor architecture.
+
+### `CGO_ENABLED`
+
+One exception is the `CGO_ENABLED` option, which is set explicitly when building Terraform binaries. For most platforms, we build with `CGO_ENABLED=0` in order to produce a statically linked binary. For MacOS/Darwin operating systems, we build with `CGO_ENABLED=1` to avoid a platform-specific issue with DNS resolution. 
+
+

scripts/build.sh

@@ -41,9 +41,10 @@ export CGO_ENABLED=0
 # Set module download mode to readonly to not implicitly update go.mod
 export GOFLAGS="-mod=readonly"
 
-# In release mode we don't want debug information in the binary
+# In release mode we don't want debug information in the binary and we don't
+# want the -dev version marker
 if [[ -n "${TF_RELEASE}" ]]; then
-    LD_FLAGS="-s -w"
+    LD_FLAGS="-s -w -X 'github.com/hashicorp/terraform/version.dev=no'"
 fi
 
 # Ensure all remote modules are downloaded and cached before build so that

version/VERSION

@@ -1 +1 @@
-1.6.0-dev
+1.6.0-alpha1

version/version.go

@@ -8,26 +8,45 @@
 package version
 
 import (
+	_ "embed"
 	"fmt"
+	"strings"
 
 	version "github.com/hashicorp/go-version"
 )
 
-// The main version number that is being run at the moment.
-var Version = "1.6.0"
+// rawVersion is the current version as a string, as read from the VERSION
+// file. This must be a valid semantic version.
+//
+//go:embed VERSION
+var rawVersion string
+
+// dev determines whether the -dev prerelease marker will
+// be included in version info. It is expected to be set to "no" using
+// linker flags when building binaries for release.
+var dev string = "yes"
 
-// A pre-release marker for the version. If this is "" (empty string)
-// then it means that it is a final release. Otherwise, this is a pre-release
-// such as "dev" (in development), "beta", "rc1", etc.
-var Prerelease = "dev"
+// The main version number that is being run at the moment, populated from the raw version.
+var Version string
 
-// SemVer is an instance of version.Version. This has the secondary
-// benefit of verifying during tests and init time that our version is a
-// proper semantic version, which should always be the case.
+// A pre-release marker for the version, populated using a combination of the raw version
+// and the dev flag.
+var Prerelease string
+
+// SemVer is an instance of version.Version representing the main version
+// without any prerelease information.
 var SemVer *version.Version
 
 func init() {
-	SemVer = version.Must(version.NewVersion(Version))
+	semVerFull := version.Must(version.NewVersion(strings.TrimSpace(rawVersion)))
+	SemVer = semVerFull.Core()
+	Version = SemVer.String()
+
+	if dev == "no" {
+		Prerelease = semVerFull.Prerelease()
+	} else {
+		Prerelease = "dev"
+	}
 }
 
 // Header is the header name used to send the current terraform version

version/version_test.go

@@ -0,0 +1,30 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package version
+
+import (
+	"regexp"
+	"strings"
+	"testing"
+)
+
+// Smoke test to validate that the version file can be read correctly and all exported
+// variables include the expected information.
+func TestVersion(t *testing.T) {
+	if match, _ := regexp.MatchString("[^\\d+\\.]", Version); match != false {
+		t.Fatalf("Version should contain only the main version")
+	}
+
+	if match, _ := regexp.MatchString("[^a-z\\d]", Prerelease); match != false {
+		t.Fatalf("Prerelease should contain only letters and numbers")
+	}
+
+	if SemVer.Prerelease() != "" {
+		t.Fatalf("SemVer should not include prerelease information")
+	}
+
+	if !strings.Contains(String(), Prerelease) {
+		t.Fatalf("Full version string should include prerelease information")
+	}
+}