Rename projects to cache package

internal/cache/projects_git.go

@@ -0,0 +1,60 @@
+package cache
+
+import (
+	"context"
+	"time"
+
+	git "github.com/go-git/go-git/v5"
+	"gitlab.sweetwater.com/it/devops/tools/gitlab-project-manager/internal/remotes/projects"
+)
+
+const gitCloneTimeoutSecs = 30
+
+// Will either read in the current repo, preparing a report
+// on its current state, or will clone the project if it has not
+// already been cloned in its path
+func (c *Cache) OpenProject(ctx context.Context, project *projects.Project) *git.Repository {
+	path := c.GetProjectPath(project)
+	cloneCtx, cncl := context.WithDeadline(ctx, time.Now().Add(gitCloneTimeoutSecs*time.Second))
+	defer cncl()
+
+	var repo *git.Repository
+	var err error
+
+	if repo, err = git.PlainOpen(path); err != nil {
+		if err == git.ErrRepositoryNotExists {
+			c.log.Debug("Project not yet cloned")
+		}
+	}
+
+	if repo == nil {
+		// Check to make sure we can connect before we time out
+		// shouldn't be necessary, but go-git does not properly
+		// honor its context
+		if err := project.CheckHost(projects.GitlabProtoSSH); err != nil {
+			c.log.Fatal("Git remote unreachable, giving up", c.log.Args("error", err))
+		}
+
+		c.log.Info("Cloning project from remote", c.log.Args("remote", project.SSHURLToRepo))
+		repo, err = git.PlainCloneContext(cloneCtx, path, false, &git.CloneOptions{
+			URL: project.SSHURLToRepo,
+		})
+
+		if err == git.ErrRepositoryAlreadyExists {
+			c.log.Debug("Skipping clone, already exists")
+		} else if err != nil {
+			c.log.Fatal("Failed to open git project", c.log.Args(
+				"error", err,
+			))
+		}
+	}
+
+	head, err := repo.Head()
+	if err != nil {
+		c.log.Fatal("Something went wrong, unable to fetch HEAD from repo", c.log.Args(
+			"error", err,
+		))
+	}
+	c.log.Debug("Repository ready", c.log.Args("branch", head.Name().String()))
+	return repo
+}