branch-preserver.patch

   1 diff --git a/shells/abstract.go b/shells/abstract.go
   2 index e4ae2b0..f3cb56b 100644
   3 --- a/shells/abstract.go
   4 +++ b/shells/abstract.go
   5 @@ -99,7 +99,11 @@ func (b *AbstractShell) writeFetchCmd(w ShellWriter, build *common.Build, projec
   6
   7  func (b *AbstractShell) writeCheckoutCmd(w ShellWriter, build *common.Build) {
   8         w.Notice("Checking out %s as %s...", build.Sha[0:8], build.RefName)
   9 -       w.Command("git", "checkout", "-f", "-q", build.Sha)
  10 +       if build.Tag {
  11 +               w.Command("git", "checkout", "-f", "-q", build.Sha)
  12 +       } else {
  13 +               w.Command("git", "checkout", "-fq", "-B", build.RefName, build.Sha)
  14 +       }
  15  }
  16
  17  func (b *AbstractShell) cacheFile(build *common.Build, userKey string) (key, file string) {