Merge pull request 'Add error handling and improve comments' (#7) from fix-1.9.x into master

Reviewed-on: #7

Makefile

@@ -7,12 +7,12 @@ build:
 # Clean
 ####################################################
 clean:
-	rm -f ~/.local/bin/versionedTerraform
+	rm -f $(shell go env GOPATH)/bin/versionedTerraform
 ####################################################
 # Install
 ####################################################
 install:
-	mv versionedTerraform ~/.local/bin/
+	mv versionedTerraform $(shell go env GOPATH)/bin/
 ####################################################
 # help feature
 ####################################################
@@ -22,6 +22,6 @@ help:
 	@echo 'Targets:'
 	@echo '  build    go build -o versionedTerraform ./cmd'
 	@echo '  clean    removes installed versionedTerraform file'
-	@echo '  install        installs versionedTerraform to local user bin folder'
+	@echo '  install  installs versionedTerraform to bin folder in GOPATH'
 	@echo '  all      Nothing to do.'
 	@echo ''

README.md

@@ -5,7 +5,7 @@ A wrapper for terraform to detect the expected version of terraform,
 download, and execute that version
 
 ## Requirements
-- go compiler (only tested on go1.17)
+- go
 
 ## Install
 `make build install` for installation to local user<br>

SemVersion.go

@@ -86,3 +86,50 @@ func (s *SemVersion) VersionInSlice(sSem []SemVersion) bool {
 	}
 	return false
 }
+
+func (s *SemVersion) IsEqualTo(s2 SemVersion) bool {
+	if s.majorVersion == s2.majorVersion && s.minorVersion == s2.minorVersion && s.patchVersion == s2.patchVersion {
+		return true
+	}
+	return false
+}
+
+func (s *SemVersion) IsLessThan(s2 SemVersion) bool {
+	if s2.majorVersion > s.majorVersion {
+		return true
+	}
+	if s2.minorVersion > s.minorVersion && s2.majorVersion == s.majorVersion {
+		return true
+	}
+	if s2.patchVersion > s.patchVersion && s2.majorVersion == s.majorVersion && s2.minorVersion == s.minorVersion {
+		return true
+	}
+	return false
+}
+
+func (s *SemVersion) IsGreaterThan(s2 SemVersion) bool {
+	if s2.majorVersion < s.majorVersion {
+		return true
+	}
+	if s2.minorVersion < s.minorVersion && s2.majorVersion == s.majorVersion {
+		return true
+	}
+	if s2.patchVersion < s.patchVersion && s2.majorVersion == s.majorVersion && s2.minorVersion == s.minorVersion {
+		return true
+	}
+	return false
+}
+
+func (s *SemVersion) IsLessOrEqual(s2 SemVersion) bool {
+	if s.IsLessThan(s2) || s.IsEqualTo(s2) {
+		return true
+	}
+	return false
+}
+
+func (s *SemVersion) IsGreaterOrEqual(s2 SemVersion) bool {
+	if s.IsGreaterThan(s2) || s.IsEqualTo(s2) {
+		return true
+	}
+	return false
+}

SemVersion_test.go

@@ -86,3 +86,688 @@ func TestSemVersion_VersionInSlice_fail(t *testing.T) {
 		t.Errorf("Expected Sem Version to not be found in semArray")
 	}
 }
+
+func TestSemVersion_IsLessThan(t *testing.T) {
+	cases := []struct {
+		name   string
+		want   bool
+		s1, s2 SemVersion
+	}{
+		{"IsEqualTo",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionLess",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MinorVersionLess",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionLess",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionGreater",
+			false,
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+		},
+		{"MinorVersionGreater",
+			false,
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionGreater",
+			false,
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+	}
+	for _, c := range cases {
+		t.Run("Test: "+c.name, func(t *testing.T) {
+			t.Parallel()
+			got := c.s1.IsLessThan(c.s2)
+			if c.want != got {
+				t.Errorf("Expected %+v got %+v", c.want, got)
+			}
+		})
+	}
+}
+
+func TestSemVersion_IsGreaterThan(t *testing.T) {
+	cases := []struct {
+		name   string
+		want   bool
+		s1, s2 SemVersion
+	}{
+		{"IsEqualTo",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MinorVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionGreater",
+			true,
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+		},
+		{"MinorVersionGreater",
+			true,
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionGreater",
+			true,
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+	}
+	for _, c := range cases {
+		t.Run("Test: "+c.name, func(t *testing.T) {
+			t.Parallel()
+			got := c.s1.IsGreaterThan(c.s2)
+			if c.want != got {
+				t.Errorf("Expected %+v got %+v", c.want, got)
+			}
+		})
+	}
+}
+
+func TestSemVersion_IsEqualTo(t *testing.T) {
+	cases := []struct {
+		name   string
+		want   bool
+		s1, s2 SemVersion
+	}{
+		{"IsEqualTo",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MinorVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionGreater",
+			false,
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+		},
+		{"MinorVersionGreater",
+			false,
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionGreater",
+			false,
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+	}
+	for _, c := range cases {
+		t.Run("Test: "+c.name, func(t *testing.T) {
+			t.Parallel()
+			got := c.s1.IsEqualTo(c.s2)
+			if c.want != got {
+				t.Errorf("Expected %+v got %+v", c.want, got)
+			}
+		})
+	}
+}
+
+func TestSemVersion_IsLessOrEqual(t *testing.T) {
+	cases := []struct {
+		name   string
+		want   bool
+		s1, s2 SemVersion
+	}{
+		{"IsEqualTo",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionLess",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MinorVersionLess",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionLess",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionGreater",
+			false,
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+		},
+		{"MinorVersionGreater",
+			false,
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionGreater",
+			false,
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+	}
+	for _, c := range cases {
+		t.Run("Test: "+c.name, func(t *testing.T) {
+			t.Parallel()
+			got := c.s1.IsLessOrEqual(c.s2)
+			if c.want != got {
+				t.Errorf("Expected %+v got %+v", c.want, got)
+			}
+		})
+	}
+}
+
+func TestSemVersion_IsGreaterOrEqual(t *testing.T) {
+	cases := []struct {
+		name   string
+		want   bool
+		s1, s2 SemVersion
+	}{
+		{"IsEqualTo",
+			true,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MinorVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionLess",
+			false,
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"MajorVersionGreater",
+			true,
+			SemVersion{
+				version:      "2.2.3",
+				isStable:     false,
+				majorVersion: 2,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+		},
+		{"MinorVersionGreater",
+			true,
+			SemVersion{
+				version:      "1.3.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 3,
+				patchVersion: 3,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+		{"PatchVersionGreater",
+			true,
+			SemVersion{
+				version:      "1.2.4",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 4,
+			},
+			SemVersion{
+				version:      "1.2.3",
+				isStable:     false,
+				majorVersion: 1,
+				minorVersion: 2,
+				patchVersion: 3,
+			},
+		},
+	}
+	for _, c := range cases {
+		t.Run("Test: "+c.name, func(t *testing.T) {
+			t.Parallel()
+			got := c.s1.IsGreaterOrEqual(c.s2)
+			if c.want != got {
+				t.Errorf("Expected %+v got %+v", c.want, got)
+			}
+		})
+	}
+}

darwin_amd64.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_darwin_amd64.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

darwin_arm_64.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_darwin_arm64.zip"
+	minVersion      = "1.0.2"
+	alternateSuffix = "_darwin_amd64.zip"
 )

freebsd_386.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_freebsd_386.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

freebsd_amd_64.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_freebsd_amd64.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

freebsd_arm.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_freebsd_arm.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

linux_386.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_linux_386.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

linux_amd_64.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_linux_amd64.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

linux_arm.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_linux_arm.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

linux_arm64.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_linux_arm64.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

openbsd_386.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_openbsd_386.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

openbsd_amd64.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_openbsd_amd64.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

solaris_amd64.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_solaris_amd64.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

versionedTerraform.go

@@ -5,6 +5,7 @@ import (
 	"bufio"
 	"bytes"
 	"errors"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"net/http"
@@ -62,7 +63,6 @@ func (v *Version) getOneLessRelease() {
 
 // getLatestRelease returns the latest release from Version
 func (v *Version) getLatestRelease() {
-	//todo clean up
 	for _, release := range v.availableVersions {
 		if release.majorVersion > v.Version.majorVersion &&
 			(release.isStable || !needsStable) {
@@ -86,51 +86,59 @@ func (v *Version) getLatestRelease() {
 // configuration directory
 func (v *Version) InstallTerraformVersion() error {
 	homeDir, _ := os.UserHomeDir()
-	resp, err := http.Get(hashicorpUrl +
+	suffix := fileSuffix
+	minV := NewSemVersion(minVersion)
+	if v.Version.IsLessThan(*minV) {
+		suffix = alternateSuffix
+	}
+	url := hashicorpUrl +
 		v.Version.ToString() +
 		"/" + terraformPrefix +
 		v.Version.ToString() +
-		fileSuffix)
+		suffix
+
+	resp, err := http.Get(url)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to download Terraform: %v", err)
 	}
 	defer resp.Body.Close()
 
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to read response body: %v", err)
 	}
 
 	zipReader, err := zip.NewReader(bytes.NewReader(body), int64(len(body)))
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to create zip reader: %v", err)
 	}
+
 	versionedFileName := homeDir + versionedTerraformFolder + "/" + terraformPrefix + v.Version.ToString()
-	versionedFile, err := os.OpenFile(versionedFileName, os.O_WRONLY, 0755)
+	versionedFile, err := os.OpenFile(versionedFileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
-	if os.IsNotExist(err) {
-		versionedFile, err = os.OpenFile(versionedFileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0755)
 	if err != nil {
-			return err
+		return fmt.Errorf("failed to create output file: %v", err)
-		}
-	}
-	if err != nil {
-		return err
 	}
 	defer versionedFile.Close()
 
-	for _, zipFIle := range zipReader.File {
+	for _, zipFile := range zipReader.File {
-		zr, err := zipFIle.Open()
+		if zipFile.Name != "terraform" {
-		if err != nil {
+			continue
-			return err
 		}
-		unzippedFileBytes, _ := ioutil.ReadAll(zr)
 
-		_, err = versionedFile.Write(unzippedFileBytes)
+		zr, err := zipFile.Open()
 		if err != nil {
-			return err
+			return fmt.Errorf("failed to open zip file: %v", err)
 		}
-		zr.Close()
+		defer zr.Close()
+
+		_, err = io.Copy(versionedFile, zr)
+		if err != nil {
+			return fmt.Errorf("failed to write terraform binary: %v", err)
 		}
+
+		break
+	}
+
 	return nil
 }
 

windows_386.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_windows_386.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )

windows_amd64.go

@@ -5,4 +5,6 @@ package versionedTerraform
 
 const (
 	fileSuffix      = "_windows_amd64.zip"
+	minVersion      = "0.0.0"
+	alternateSuffix = ""
 )