Add bare repo mirroring

Signed-off-by: Richard Nixon <[email protected]>

Author: trickyearlobe

README.md

@@ -39,6 +39,25 @@ Finally, make sure you have an up to date command line version of `git` installe
 * Scroll down in `settings` to `Developer Settings` and create a `personal access token (classic)`
 * Grant the token sufficient rights to access your github orgs/repos and configure SSO if necessary (just like we did for the SSH key)
 
+## Bare mirroring (optional)
+
+If `BITSYNC_MIRROR` is set to `true` then cloning will happen with the `--mirror` git option. This has the effects
+
+* Repo's will be deleted if they exist
+* The repos will be cloned bare with the mirror flag set
+* All branches and tags will be mirrored
+
+This is effectively a full archive of the repo, but it cannot be used for normal git workflows as it has the following git config options set
+
+```aiignore
+[core]
+	bare = true
+
+[remote "origin"]
+	fetch = +refs/*:refs/*
+	mirror = true
+```
+
 ## Using
 
 Pass the credentials, and optional org lists, as environment variables and sync your repos.

main.go

@@ -9,7 +9,24 @@ import (
     "time"
 )
 
+func mirrorGitRepo(repoDir, cloneUrl, mainBranch string) {
+    fmt.Printf("  Bare mirror %s from %s\n", repoDir, cloneUrl)
+    out, err := exec.Command("rm", "-rf", repoDir).CombinedOutput()
+    if err != nil {
+        fmt.Println("Error during delete directory: " + string(out))
+    }
+    out, err = exec.Command("git", "clone", "--mirror", cloneUrl, repoDir).CombinedOutput()
+    if err != nil {
+        fmt.Println("Error during mirror: " + string(out))
+    }
+}
+
 func cloneOrSyncGitRepo(repoDir, cloneUrl, mainBranch string) {
+    mirror := os.Getenv("BITSYNC_MIRROR")
+    if mirror == "true" {
+        mirrorGitRepo(repoDir, cloneUrl, mainBranch)
+        return
+    }
     fmt.Printf("  Processing git repo %s from %s\n", repoDir, cloneUrl)
     if _, err := os.Stat(repoDir); err != nil {
         out, err := exec.Command("git", "clone", cloneUrl, repoDir).CombinedOutput()