Make linting compatible with Git < v2.22.0 (#26)

rdner · web-flow · commit b3eddb337f0a · 2022-03-21T15:45:00.000+01:00
Some of our CI nodes are still using Ubuntu 18 where Git is old enough
to not support `git branch --show-current`.
diff --git a/dev-tools/mage/linter.go b/dev-tools/mage/linter.go
@@ -146,7 +146,8 @@ func (l Linter) All() error {
 func (l Linter) LastChange() error {
 	mg.Deps(l.Install, l.CheckConfig)
 
-	branch, err := sh.Output("git", "branch", "--show-current")
+	// get current branch name
+	branch, err := sh.Output("git", "rev-parse", "--abbrev-ref", "HEAD")
 	if err != nil {
 		return fmt.Errorf("failed to get the current branch: %w", err)
 	}

Original file line number	Diff line number	Diff line change
`@@ -146,7 +146,8 @@ func (l Linter) All() error {`
`146`	`146`	`func (l Linter) LastChange() error {`
`147`	`147`	`mg.Deps(l.Install, l.CheckConfig)`
`148`	`148`
`149`		`- branch, err := sh.Output("git", "branch", "--show-current")`
	`149`	`+ // get current branch name`
	`150`	`+ branch, err := sh.Output("git", "rev-parse", "--abbrev-ref", "HEAD")`
`150`	`151`	`if err != nil {`
`151`	`152`	`return fmt.Errorf("failed to get the current branch: %w", err)`
`152`	`153`	`}`