*.go: linting and adding lint to the checks done

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

.github/workflows/lint.yml

@@ -0,0 +1,33 @@
+name: lint
+
+on:
+  pull_request:
+    branches_ignore: []
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go: ['1.20']
+
+    name: Documentation and Linting
+    steps:
+
+      - uses: actions/checkout@v2
+        with:
+          path: go/src/github.com/vbatts/git-validation
+
+                               # commit for v1 release
+      - uses: actions/setup-go@0caeaed6fd66a828038c2da3c0f662a42862658f
+        with:
+          go-version: ${{ matrix.go }}
+
+      - name: lint
+        env:
+          GOPATH: /home/runner/work/git-validation/git-validation/go
+        run: |
+          set -x
+          export PATH=$GOPATH/bin:$PATH
+          cd go/src/github.com/vbatts/git-validation
+          go run mage.go -v lint

README.md

@@ -107,7 +107,7 @@ using the `GIT_CHECK_EXCLUDE` environment variable. Multiple paths should be sep
 When making a change, verify it with:
 
 ```shell
-go run mage.go vet build test
+go run mage.go lint vet build test
 ```
 
 ## Rules

main.go

@@ -27,6 +27,10 @@ var (
 	flTravisPROnly = flag.Bool("travis-pr-only", true, "when on travis, only run validations if the CI-Build is checking pull-request build")
 )
 
+func init() {
+	logrus.SetOutput(os.Stderr)
+}
+
 func main() {
 	flag.Parse()
 

validate/rules.go

@@ -75,7 +75,6 @@ func SanitizeFilters(filtStr string) (filters []string) {
 //
 // Some `includes` rules have values assigned to them.
 // i.e. -run "dco,message_regexp='^JIRA-[0-9]+ [A-Z].*$'"
-//
 func FilterRules(rules []Rule, includes []string) []Rule {
 	ret := []Rule{}
 
@@ -83,7 +82,7 @@ func FilterRules(rules []Rule, includes []string) []Rule {
 		for i := range includes {
 			if strings.Contains(includes[i], "=") {
 				chunks := strings.SplitN(includes[i], "=", 2)
-				if strings.ToLower(r.Name) == strings.ToLower(chunks[0]) {
+				if strings.EqualFold(r.Name, chunks[0]) {
 					// for these rules, the Name won't be unique per se. There may be
 					// multiple "regexp=" with different values. We'll need to set the
 					// .Value = chunk[1] and ensure r is dup'ed so they don't clobber
@@ -93,7 +92,7 @@ func FilterRules(rules []Rule, includes []string) []Rule {
 					ret = append(ret, newR)
 				}
 			} else {
-				if strings.ToLower(r.Name) == strings.ToLower(includes[i]) {
+				if strings.EqualFold(r.Name, includes[i]) {
 					ret = append(ret, r)
 				}
 			}

validate/runner.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/sirupsen/logrus"
 	"github.com/vbatts/git-validation/git"
 )
 
@@ -29,7 +30,11 @@ func NewRunner(root string, rules []Rule, commitrange string, verbose bool) (*Ru
 		if err != nil {
 			return nil, err
 		}
-		defer os.Chdir(cwd)
+		defer func() {
+			if err := os.Chdir(cwd); err != nil {
+				logrus.Warnf("changing working directory to %q failed: %s", cwd, err)
+			}
+		}()
 
 		if err := os.Chdir(newroot); err != nil {
 			return nil, err
@@ -56,7 +61,11 @@ func (r *Runner) Run() error {
 	if err != nil {
 		return err
 	}
-	defer os.Chdir(cwd)
+	defer func() {
+		if err := os.Chdir(cwd); err != nil {
+			logrus.Warnf("changing working directory to %q failed: %s", cwd, err)
+		}
+	}()
 
 	if err := os.Chdir(r.Root); err != nil {
 		return err