Get the latest release version automatically from GitHub Release

README.md

@@ -13,7 +13,7 @@ That is why I wrote a tool which parses Terraform configurations and updates all
 
 - Update version constraints of Terraform core and providers
 - Update all your Terraform configurations recursively under a given directory
-- Get the latest release version from GitHub Release
+- Get the latest release version automatically from GitHub Release
 
 # Supported Terraform version
 
@@ -84,7 +84,13 @@ If you want to update all your Terraform configurations under the current direct
 run a command like this:
 
 ```
-$ tfupdate terraform -v 0.12.8 ./ -r
+$ tfupdate terraform -v 0.12.8 -r ./
+```
+
+If the version is omitted, the latest version is automatically checked and set.
+
+```
+$ tfupdate terraform -r ./
 ```
 
 # Usage
@@ -107,7 +113,8 @@ Arguments
   PATH               A path of file or directory to update
 
 Options:
-  -v  --version      A new version constraint
+  -v  --version      A new version constraint (default: latest)
+                     If the version is omitted, the latest version is automatically checked and set.
   -r  --recursive    Check a directory recursively (default: false)
   -i  --ignore-path  A regular expression for path to ignore
                      If you want to ignore multiple directories, set the flag multiple times.
@@ -122,7 +129,10 @@ Arguments
   PATH               A path of file or directory to update
 
 Options:
-  -v  --version      A new version constraint
+  -v  --version      A new version constraint (default: latest)
+                     If the version is omitted, the latest version is automatically checked and set.
+                     Getting the latest version automatically is supported only for official providers.
+                     If you have an unofficial provider, use release latest command.
   -r  --recursive    Check a directory recursively (default: false)
   -i  --ignore-path  A regular expression for path to ignore
                      If you want to ignore multiple directories, set the flag multiple times.

command/provider.go

@@ -2,8 +2,10 @@ package command
 
 import (
 	"fmt"
+	"log"
 	"strings"
 
+	"github.com/minamijoyo/tfupdate/release"
 	"github.com/minamijoyo/tfupdate/tfupdate"
 	flag "github.com/spf13/pflag"
 )
@@ -39,7 +41,23 @@ func (c *ProviderCommand) Run(args []string) int {
 	c.name = cmdFlags.Arg(0)
 	c.path = cmdFlags.Arg(1)
 
-	option, err := tfupdate.NewOption("provider", c.name, c.version, c.recursive, c.ignorePaths)
+	v := c.version
+	if v == "latest" {
+		r, err := release.NewOfficialProviderRelease(c.name)
+		if err != nil {
+			c.UI.Error(err.Error())
+			return 1
+		}
+
+		v, err = r.Latest()
+		if err != nil {
+			c.UI.Error(err.Error())
+			return 1
+		}
+	}
+
+	log.Printf("[INFO] Update provider %s to %s", c.name, v)
+	option, err := tfupdate.NewOption("provider", c.name, v, c.recursive, c.ignorePaths)
 	if err != nil {
 		c.UI.Error(err.Error())
 		return 1
@@ -64,7 +82,10 @@ Arguments
   PATH               A path of file or directory to update
 
 Options:
-  -v  --version      A new version constraint
+  -v  --version      A new version constraint (default: latest)
+                     If the version is omitted, the latest version is automatically checked and set.
+                     Getting the latest version automatically is supported only for official providers.
+                     If you have an unofficial provider, use release latest command.
   -r  --recursive    Check a directory recursively (default: false)
   -i  --ignore-path  A regular expression for path to ignore
                      If you want to ignore multiple directories, set the flag multiple times.

command/terraform.go

@@ -2,8 +2,10 @@ package command
 
 import (
 	"fmt"
+	"log"
 	"strings"
 
+	"github.com/minamijoyo/tfupdate/release"
 	"github.com/minamijoyo/tfupdate/tfupdate"
 	flag "github.com/spf13/pflag"
 )
@@ -37,7 +39,23 @@ func (c *TerraformCommand) Run(args []string) int {
 
 	c.path = cmdFlags.Arg(0)
 
-	option, err := tfupdate.NewOption("terraform", "", c.version, c.recursive, c.ignorePaths)
+	v := c.version
+	if v == "latest" {
+		r, err := release.NewTerraformRelease()
+		if err != nil {
+			c.UI.Error(err.Error())
+			return 1
+		}
+
+		v, err = r.Latest()
+		if err != nil {
+			c.UI.Error(err.Error())
+			return 1
+		}
+	}
+
+	log.Printf("[INFO] Update terraform to %s", v)
+	option, err := tfupdate.NewOption("terraform", "", v, c.recursive, c.ignorePaths)
 	if err != nil {
 		c.UI.Error(err.Error())
 		return 1
@@ -61,7 +79,8 @@ Arguments
   PATH               A path of file or directory to update
 
 Options:
-  -v  --version      A new version constraint
+  -v  --version      A new version constraint (default: latest)
+                     If the version is omitted, the latest version is automatically checked and set.
   -r  --recursive    Check a directory recursively (default: false)
   -i  --ignore-path  A regular expression for path to ignore
                      If you want to ignore multiple directories, set the flag multiple times.

release/provider.go

@@ -0,0 +1,27 @@
+package release
+
+import "fmt"
+
+// OfficialProviderRelease is a release implementation which provides version information with GitHub Release.
+type OfficialProviderRelease struct {
+	gh *GitHubRelease
+}
+
+// NewOfficialProviderRelease is a factory method which returns an OfficialProviderRelease instance.
+func NewOfficialProviderRelease(name string) (Release, error) {
+	owner := "terraform-providers"
+	repo := fmt.Sprintf("terraform-provider-%s", name)
+	r, err := NewGitHubRelease(owner, repo)
+	if err != nil {
+		return nil, err
+	}
+
+	return &OfficialProviderRelease{
+		gh: r.(*GitHubRelease),
+	}, nil
+}
+
+// Latest returns a latest version.
+func (r *OfficialProviderRelease) Latest() (string, error) {
+	return r.gh.Latest()
+}

release/terraform.go

@@ -0,0 +1,23 @@
+package release
+
+// TerraformRelease is a release implementation which provides version information with GitHub Release.
+type TerraformRelease struct {
+	gh *GitHubRelease
+}
+
+// NewTerraformRelease is a factory method which returns an TerraformRelease instance.
+func NewTerraformRelease() (Release, error) {
+	r, err := NewGitHubRelease("hashicorp", "terraform")
+	if err != nil {
+		return nil, err
+	}
+
+	return &TerraformRelease{
+		gh: r.(*GitHubRelease),
+	}, nil
+}
+
+// Latest returns a latest version.
+func (r *TerraformRelease) Latest() (string, error) {
+	return r.gh.Latest()
+}