scripts/build/*: Fix some golint issues

See,

$ gometalinter --vendor --disable-all --enable=golint ./...
build/release_publisher/externalrelease.go:55:6:warning: type getHttpContents should be getHTTPContents (golint)
build/release_publisher/publisher.go:18:2:warning: struct field apiUri should be apiURI (golint)
build/release_publisher/publisher.go:66:6:warning: exported type ReleaseType should have comment or be unexported (golint)
build/release_publisher/publisher.go:69:2:warning: exported const STABLE should have comment (or a comment on this block) or be unexported (golint)
build/release_publisher/publisher.go:185:16:warning: should replace errors.New(fmt.Sprintf(...)) with fmt.Errorf(...) (golint)
build/release_publisher/publisher_test.go:102:6:warning: type mockHttpGetter should be mockHTTPGetter (golint)

scripts/build/release_publisher/externalrelease.go

@@ -17,7 +17,7 @@ type releaseFromExternalContent struct {
 func (re releaseFromExternalContent) prepareRelease(baseArchiveURL, whatsNewURL string, releaseNotesURL string, nightly bool) (*release, error) {
 	version := re.rawVersion[1:]
 	beta := strings.Contains(version, "beta")
-	var rt ReleaseType
+	var rt releaseType
 	if beta {
 		rt = BETA
 	} else if nightly {
@@ -52,9 +52,9 @@ type urlGetter interface {
 	getContents(url string) (string, error)
 }
 
-type getHttpContents struct{}
+type getHTTPContents struct{}
 
-func (getHttpContents) getContents(url string) (string, error) {
+func (getHTTPContents) getContents(url string) (string, error) {
 	response, err := http.Get(url)
 	if err != nil {
 		return "", err

scripts/build/release_publisher/localrelease.go

@@ -20,7 +20,7 @@ type releaseLocalSources struct {
 
 func (r releaseLocalSources) prepareRelease(baseArchiveURL, whatsNewURL string, releaseNotesURL string, nightly bool) (*release, error) {
 	if !nightly {
-		return nil, errors.New("Local releases only supported for nightly builds.")
+		return nil, errors.New("Local releases only supported for nightly builds")
 	}
 	buildData := r.findBuilds(baseArchiveURL)
 
@@ -91,5 +91,5 @@ func grabVersion(name string, suffix string) (string, error) {
 		return string(match[2]), nil
 	}
 
-	return "", errors.New("No version found.")
+	return "", errors.New("No version found")
 }

scripts/build/release_publisher/main.go

@@ -72,7 +72,7 @@ func main() {
 		}
 	} else {
 		builder = releaseFromExternalContent{
-			getter:                 getHttpContents{},
+			getter:                 getHTTPContents{},
 			rawVersion:             version,
 			artifactConfigurations: buildArtifacts,
 		}
@@ -80,7 +80,7 @@ func main() {
 
 	p := publisher{
 		apiKey:         apiKey,
-		apiUri:         "https://grafana.com/api",
+		apiURI:         "https://grafana.com/api",
 		product:        product,
 		dryRun:         dryRun,
 		enterprise:     enterprise,

scripts/build/release_publisher/publisher.go

@@ -9,13 +9,11 @@ import (
 	"net/http"
 	"strings"
 	"time"
-
-	"github.com/pkg/errors"
 )
 
 type publisher struct {
 	apiKey         string
-	apiUri         string
+	apiURI         string
 	product        string
 	dryRun         bool
 	enterprise     bool
@@ -63,23 +61,26 @@ func (p *publisher) postRelease(r *release) error {
 	return nil
 }
 
-type ReleaseType int
+type releaseType int
 
 const (
-	STABLE ReleaseType = iota + 1
+	// STABLE is a release type constant
+	STABLE releaseType = iota + 1
+	// BETA is a release type constant
 	BETA
+	// NIGHTLY is a release type constant
 	NIGHTLY
 )
 
-func (rt ReleaseType) beta() bool {
+func (rt releaseType) beta() bool {
 	return rt == BETA
 }
 
-func (rt ReleaseType) stable() bool {
+func (rt releaseType) stable() bool {
 	return rt == STABLE
 }
 
-func (rt ReleaseType) nightly() bool {
+func (rt releaseType) nightly() bool {
 	return rt == NIGHTLY
 }
 
@@ -89,7 +90,7 @@ type buildArtifact struct {
 	urlPostfix string
 }
 
-func (t buildArtifact) getURL(baseArchiveURL, version string, releaseType ReleaseType) string {
+func (t buildArtifact) getURL(baseArchiveURL, version string, releaseType releaseType) string {
 	prefix := "-"
 	rhelReleaseExtra := ""
 
@@ -182,13 +183,13 @@ func filterBuildArtifacts(filters []artifactFilter) ([]buildArtifact, error) {
 		}
 
 		if !matched {
-			return nil, errors.New(fmt.Sprintf("No buildArtifact for os=%v, arch=%v", f.os, f.arch))
+			return nil, fmt.Errorf("No buildArtifact for os=%v, arch=%v", f.os, f.arch)
 		}
 	}
 	return artifacts, nil
 }
 
-func newBuild(baseArchiveURL string, ba buildArtifact, version string, rt ReleaseType, sha256 string) build {
+func newBuild(baseArchiveURL string, ba buildArtifact, version string, rt releaseType, sha256 string) build {
 	return build{
 		Os:     ba.os,
 		URL:    ba.getURL(baseArchiveURL, version, rt),
@@ -198,7 +199,7 @@ func newBuild(baseArchiveURL string, ba buildArtifact, version string, rt Releas
 }
 
 func (p *publisher) apiURL(url string) string {
-	return fmt.Sprintf("%s/%s%s", p.apiUri, p.product, url)
+	return fmt.Sprintf("%s/%s%s", p.apiURI, p.product, url)
 }
 
 func (p *publisher) postRequest(url string, obj interface{}, desc string) error {

scripts/build/release_publisher/publisher_test.go

@@ -64,7 +64,7 @@ func TestPreparingReleaseFromRemote(t *testing.T) {
 
 	for _, test := range cases {
 		builder := releaseFromExternalContent{
-			getter:                 mockHttpGetter{},
+			getter:                 mockHTTPGetter{},
 			rawVersion:             test.version,
 			artifactConfigurations: test.buildArtifacts,
 		}
@@ -99,9 +99,9 @@ func TestPreparingReleaseFromRemote(t *testing.T) {
 	}
 }
 
-type mockHttpGetter struct{}
+type mockHTTPGetter struct{}
 
-func (mockHttpGetter) getContents(url string) (string, error) {
+func (mockHTTPGetter) getContents(url string) (string, error) {
 	return url, nil
 }