Merge pull request #8 from hashicorp/install-terraform
tfinstall package
diff --git a/go.mod b/go.mod
index 2fbeece..8f16da9 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,9 @@
require (
github.com/davecgh/go-spew v1.1.1
+ github.com/hashicorp/go-checkpoint v0.5.0
+ github.com/hashicorp/go-getter v1.4.1
+ github.com/hashicorp/go-version v1.1.0
github.com/hashicorp/terraform-json v0.5.0
- golang.org/x/text v0.3.2 // indirect
+ golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5
)
diff --git a/go.sum b/go.sum
index 3295730..a338f6a 100644
--- a/go.sum
+++ b/go.sum
@@ -1,23 +1,173 @@
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diff --git a/tfinstall/pubkey.go b/tfinstall/pubkey.go
new file mode 100644
index 0000000..a14f88c
--- /dev/null
+++ b/tfinstall/pubkey.go
@@ -0,0 +1,32 @@
+package tfinstall
+
+const hashicorpPublicKey = `-----BEGIN PGP PUBLIC KEY BLOCK-----
+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+mCN
+-----END PGP PUBLIC KEY BLOCK-----`
diff --git a/tfinstall/tfinstall.go b/tfinstall/tfinstall.go
new file mode 100644
index 0000000..0330f03
--- /dev/null
+++ b/tfinstall/tfinstall.go
@@ -0,0 +1,287 @@
+package tfinstall
+
+import (
+ "fmt"
+ "io/ioutil"
+ "log"
+ "net/http"
+ "os"
+ "os/exec"
+ "path/filepath"
+ "runtime"
+ "strings"
+
+ "github.com/hashicorp/go-checkpoint"
+ "github.com/hashicorp/go-getter"
+ "github.com/hashicorp/go-version"
+ "golang.org/x/crypto/openpgp"
+)
+
+const baseUrl = "https://releases.hashicorp.com/terraform"
+
+type ExecPathFinder interface {
+ ExecPath() (string, error)
+}
+
+type ExactPathOption struct {
+ execPath string
+}
+
+func ExactPath(execPath string) *ExactPathOption {
+ opt := &ExactPathOption{
+ execPath: execPath,
+ }
+ return opt
+}
+
+func (opt *ExactPathOption) ExecPath() (string, error) {
+ if _, err := os.Stat(opt.execPath); err != nil {
+ // fall through to the next strategy if the local path does not exist
+ return "", nil
+ }
+ return opt.execPath, nil
+}
+
+type LookPathOption struct {
+}
+
+func LookPath() *LookPathOption {
+ opt := &LookPathOption{}
+
+ return opt
+}
+
+func (opt *LookPathOption) ExecPath() (string, error) {
+ p, err := exec.LookPath("terraform")
+ if err != nil {
+ if notFoundErr, ok := err.(*exec.Error); ok && notFoundErr.Err == exec.ErrNotFound {
+ log.Printf("[WARN] could not locate a terraform executable on system path; continuing")
+ return "", nil
+ }
+ return "", err
+ }
+ return p, nil
+}
+
+type LatestVersionOption struct {
+ forceCheckpoint bool
+ installDir string
+}
+
+func LatestVersion(installDir string, forceCheckpoint bool) *LatestVersionOption {
+ opt := &LatestVersionOption{
+ forceCheckpoint: forceCheckpoint,
+ installDir: installDir,
+ }
+
+ return opt
+}
+
+func (opt *LatestVersionOption) ExecPath() (string, error) {
+ v, err := latestVersion(opt.forceCheckpoint)
+ if err != nil {
+ return "", err
+ }
+
+ return downloadWithVerification(v, opt.installDir)
+}
+
+type ExactVersionOption struct {
+ tfVersion string
+ installDir string
+}
+
+func ExactVersion(tfVersion string, installDir string) *ExactVersionOption {
+ opt := &ExactVersionOption{
+ tfVersion: tfVersion,
+ installDir: installDir,
+ }
+
+ return opt
+}
+
+func (opt *ExactVersionOption) ExecPath() (string, error) {
+ // validate version
+ _, err := version.NewVersion(opt.tfVersion)
+ if err != nil {
+ return "", err
+ }
+
+ return downloadWithVerification(opt.tfVersion, opt.installDir)
+}
+
+func Find(opts ...ExecPathFinder) (string, error) {
+ var terraformPath string
+
+ // go through the options in order
+ // until a valid terraform executable is found
+ for _, opt := range opts {
+ p, err := opt.ExecPath()
+ if err != nil {
+ return "", fmt.Errorf("unexpected error: %s", err)
+ }
+
+ if p == "" {
+ // strategy did not locate an executable - fall through to next
+ continue
+ } else {
+ terraformPath = p
+ break
+ }
+ }
+
+ err := runTerraformVersion(terraformPath)
+ if err != nil {
+ return "", fmt.Errorf("executable found at path %s is not terraform: %s", terraformPath, err)
+ }
+
+ if terraformPath == "" {
+ return "", fmt.Errorf("could not find terraform executable")
+ }
+
+ return terraformPath, nil
+}
+
+func downloadWithVerification(tfVersion string, installDir string) (string, error) {
+ osName := runtime.GOOS
+ archName := runtime.GOARCH
+
+ // setup: ensure we have a place to put our downloaded terraform binary
+ var tfDir string
+ var err error
+ if installDir == "" {
+ tfDir, err = ioutil.TempDir("", "tfexec")
+ if err != nil {
+ return "", fmt.Errorf("failed to create temp dir: %s", err)
+ }
+ } else {
+ if _, err := os.Stat(installDir); err != nil {
+ return "", fmt.Errorf("could not access directory %s for installing Terraform: %s", installDir, err)
+ }
+ tfDir = installDir
+
+ }
+
+ // setup: getter client
+ httpHeader := make(http.Header)
+ httpHeader.Set("User-Agent", "HashiCorp-tfinstall/"+Version)
+ httpGetter := &getter.HttpGetter{
+ Netrc: true,
+ }
+ client := getter.Client{
+ Getters: map[string]getter.Getter{
+ "https": httpGetter,
+ },
+ }
+ client.Mode = getter.ClientModeAny
+
+ // firstly, download and verify the signature of the checksum file
+
+ sumsTmpDir, err := ioutil.TempDir("", "tfinstall")
+ if err != nil {
+ return "", err
+ }
+ defer os.RemoveAll(sumsTmpDir)
+
+ sumsFilename := "terraform_" + tfVersion + "_SHA256SUMS"
+ sumsSigFilename := sumsFilename + ".sig"
+
+ sumsUrl := fmt.Sprintf("%s/%s/%s",
+ baseUrl, tfVersion, sumsFilename)
+ sumsSigUrl := fmt.Sprintf("%s/%s/%s",
+ baseUrl, tfVersion, sumsSigFilename)
+
+ client.Src = sumsUrl
+ client.Dst = sumsTmpDir
+ err = client.Get()
+ if err != nil {
+ return "", fmt.Errorf("error fetching checksums: %s", err)
+ }
+
+ client.Src = sumsSigUrl
+ err = client.Get()
+ if err != nil {
+ return "", fmt.Errorf("error fetching checksums signature: %s", err)
+ }
+
+ sumsPath := filepath.Join(sumsTmpDir, sumsFilename)
+ sumsSigPath := filepath.Join(sumsTmpDir, sumsSigFilename)
+
+ err = verifySumsSignature(sumsPath, sumsSigPath)
+ if err != nil {
+ return "", err
+ }
+
+ // secondly, download Terraform itself, verifying the checksum
+ url := tfUrl(tfVersion, osName, archName)
+ client.Src = url
+ client.Dst = tfDir
+ client.Mode = getter.ClientModeDir
+ err = client.Get()
+ if err != nil {
+ return "", err
+ }
+
+ return filepath.Join(tfDir, "terraform"), nil
+}
+
+func tfUrl(tfVersion, osName, archName string) string {
+ sumsFilename := "terraform_" + tfVersion + "_SHA256SUMS"
+ sumsUrl := fmt.Sprintf("%s/%s/%s",
+ baseUrl, tfVersion, sumsFilename)
+ return fmt.Sprintf(
+ "%s/%s/terraform_%s_%s_%s.zip?checksum=file:%s",
+ baseUrl, tfVersion, tfVersion, osName, archName, sumsUrl,
+ )
+}
+
+func latestVersion(forceCheckpoint bool) (string, error) {
+ resp, err := checkpoint.Check(&checkpoint.CheckParams{
+ Product: "terraform",
+ Force: forceCheckpoint,
+ })
+ if err != nil {
+ return "", err
+ }
+
+ if resp.CurrentVersion == "" {
+ return "", fmt.Errorf("could not determine latest version of terraform using checkpoint: CHECKPOINT_DISABLE may be set")
+ }
+
+ return resp.CurrentVersion, nil
+}
+
+// verifySumsSignature downloads SHA256SUMS and SHA256SUMS.sig and verifies
+// the signature using the HashiCorp public key.
+func verifySumsSignature(sumsPath, sumsSigPath string) error {
+ el, err := openpgp.ReadArmoredKeyRing(strings.NewReader(hashicorpPublicKey))
+ if err != nil {
+ return err
+ }
+ data, err := os.Open(sumsPath)
+ if err != nil {
+ return err
+ }
+ sig, err := os.Open(sumsSigPath)
+ if err != nil {
+ return err
+ }
+ _, err = openpgp.CheckDetachedSignature(el, data, sig)
+
+ return err
+}
+
+func runTerraformVersion(execPath string) error {
+ cmd := exec.Command(execPath, "version")
+
+ out, err := cmd.Output()
+ if err != nil {
+ return err
+ }
+
+ if !strings.HasPrefix(string(out), "Terraform v") {
+ return fmt.Errorf("located executable at %s, but output of `terraform version` was:\n%s", execPath, out)
+ }
+
+ return nil
+}
diff --git a/tfinstall/tfinstall_test.go b/tfinstall/tfinstall_test.go
new file mode 100644
index 0000000..9f29762
--- /dev/null
+++ b/tfinstall/tfinstall_test.go
@@ -0,0 +1,158 @@
+package tfinstall
+
+import (
+ "fmt"
+ "io/ioutil"
+ "os"
+ "os/exec"
+ "strings"
+ "testing"
+
+ "github.com/hashicorp/go-version"
+)
+
+// downloads terraform 0.12.26 from the live releases site
+func TestFindExactVersion(t *testing.T) {
+ tmpDir, err := ioutil.TempDir("", "tfinstall-test")
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer os.RemoveAll(tmpDir)
+
+ tfpath, err := Find(ExactVersion("0.12.26", tmpDir))
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ // run "terraform version" to check we've downloaded a terraform 0.12.26 binary
+ cmd := exec.Command(tfpath, "version")
+
+ out, err := cmd.Output()
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ expected := "Terraform v0.12.26"
+ actual := string(out)
+ if !strings.HasPrefix(actual, expected) {
+ t.Fatalf("ran terraform version, expected %s, but got %s", expected, actual)
+ }
+}
+
+// downloads terraform 0.13.0-beta1 from the live releases site
+func TestFindExactVersionPrerelease(t *testing.T) {
+ tmpDir, err := ioutil.TempDir("", "tfinstall-test")
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer os.RemoveAll(tmpDir)
+
+ tfpath, err := Find(ExactVersion("0.13.0-beta1", tmpDir))
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ // run "terraform version" to check we've downloaded a terraform 0.12.26 binary
+ cmd := exec.Command(tfpath, "version")
+
+ out, err := cmd.Output()
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ expected := "Terraform v0.13.0-beta1"
+ actual := string(out)
+ if !strings.HasPrefix(actual, expected) {
+ t.Fatalf("ran terraform version, expected %s, but got %s", expected, actual)
+ }
+}
+
+// test that Find returns an appropriate error when given an exact path
+// which exists, but is not a terraform executable
+func TestExactPath(t *testing.T) {
+ // we just want the path to a local executable that definitely exists
+ execPath, err := exec.LookPath("go")
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ _, err = Find(ExactPath(execPath))
+ if err == nil {
+ t.Fatalf("expected Find() to fail when given ExactPath(%s), but it did not", execPath)
+ }
+
+ expected := fmt.Sprintf("executable found at path %s is not terraform", execPath)
+ if !strings.HasPrefix(err.Error(), expected) {
+ t.Fatalf("expected Find() to return %s, but got %s", expected, err)
+ }
+}
+
+// test that Find falls back to the next working strategy when the file at
+// ExactPath does not exist
+func TestExactVersionFallback(t *testing.T) {
+ tmpDir, err := ioutil.TempDir("", "tfinstall-test")
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer os.RemoveAll(tmpDir)
+
+ tfpath, err := Find(ExactPath("/hopefully/completely/nonexistent/path"), ExactVersion("0.12.26", tmpDir))
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ // run "terraform version" to check we've downloaded a terraform 0.12.26 binary
+ cmd := exec.Command(tfpath, "version")
+
+ out, err := cmd.Output()
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ expected := "Terraform v0.12.26"
+ actual := string(out)
+ if !strings.HasPrefix(actual, expected) {
+ t.Fatalf("ran terraform version, expected %s, but got %s", expected, actual)
+ }
+}
+
+// latest version calculation itself is handled by checkpoint, so the test can be straightforward -
+// just test that we've managed to download a version of terraform later than 0.12.27
+func TestLatestVersion(t *testing.T) {
+ lowerBound := "0.12.27"
+
+ tmpDir, err := ioutil.TempDir("", "tfinstall-test")
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer os.RemoveAll(tmpDir)
+
+ tfpath, err := Find(LatestVersion(tmpDir, false))
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ cmd := exec.Command(tfpath, "version")
+
+ out, err := cmd.Output()
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ lowerBoundVersion, err := version.NewVersion("0.12.27")
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ outVersion := strings.Trim(string(out), "\n")
+ outVersion = strings.TrimLeft(outVersion, "Terraform v")
+
+ actualVersion, err := version.NewVersion(outVersion)
+ if err != nil {
+ t.Fatal(err)
+ }
+
+ if actualVersion.LessThan(lowerBoundVersion) {
+ t.Fatalf("ran terraform version, expected version to be greater than %s, but got %s", lowerBound, out)
+ }
+}
diff --git a/tfinstall/version.go b/tfinstall/version.go
new file mode 100644
index 0000000..190fdf2
--- /dev/null
+++ b/tfinstall/version.go
@@ -0,0 +1,4 @@
+package tfinstall
+
+// Version is the tfinstall package version, used in user agent headers
+const Version = "0.1.0"
