chore: migrate logic from commitsar

find_compare_branch.go

@@ -0,0 +1,27 @@
+package integrations
+
+import (
+	"fmt"
+	"os"
+)
+
+// FindCompareBranch tries to find the merge request compare branch based on environment variables used by different CIs.
+func FindCompareBranch() string {
+	githubRef := os.Getenv("GITHUB_BASE_REF")
+	if githubRef != "" {
+		return fmt.Sprintf("origin/%v", githubRef)
+	}
+
+	gitlabRef := os.Getenv("CI_MERGE_REQUEST_TARGET_BRANCH_NAME")
+	if gitlabRef != "" {
+		return fmt.Sprintf("origin/%v", gitlabRef)
+	}
+
+	// Drone specific variable https://docker-runner.docs.drone.io/configuration/environment/variables/drone-target-branch/
+	droneRef := os.Getenv("DRONE_TARGET_BRANCH")
+	if droneRef != "" {
+		return fmt.Sprintf("origin/%v", droneRef)
+	}
+
+	return "origin/master"
+}

find_compare_branch_test.go

@@ -0,0 +1,42 @@
+package integrations
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFindCompareBranch(t *testing.T) {
+	// Github action specific environment variable
+	os.Setenv("GITHUB_BASE_REF", "github-develop")
+
+	actionCompareBranch := FindCompareBranch()
+
+	assert.Equal(t, "origin/github-develop", actionCompareBranch)
+
+	os.Setenv("GITHUB_BASE_REF", "")
+
+	// Gitlab specific environment variable
+	os.Setenv("CI_MERGE_REQUEST_TARGET_BRANCH_NAME", "gitlab-develop")
+
+	gitlabCompareBranch := FindCompareBranch()
+
+	assert.Equal(t, "origin/gitlab-develop", gitlabCompareBranch)
+
+	os.Setenv("CI_MERGE_REQUEST_TARGET_BRANCH_NAME", "")
+
+	// Drone specific environment variable
+	os.Setenv("DRONE_TARGET_BRANCH", "drone-develop")
+
+	droneCompareBranch := FindCompareBranch()
+
+	assert.Equal(t, "origin/drone-develop", droneCompareBranch)
+
+	os.Setenv("DRONE_TARGET_BRANCH", "")
+
+	// Should default to master if no conditions are satisfied
+	defaultMaster := FindCompareBranch()
+
+	assert.Equal(t, "origin/master", defaultMaster)
+}

go.mod

@@ -1,3 +1,5 @@
 module github.com/outillage/integrations
 
 go 1.13
+
+require github.com/stretchr/testify v1.4.0

go.sum

@@ -0,0 +1,11 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=