$ git clone -n https://src.fedoraproject.org/rpms/golang-github-alexflint-filemutex.git /var/lib/mock/f39-build-1504172-35013/root/chroot_tmpdir/scmroot/golang-github-alexflint-filemutex
Cloning into '/var/lib/mock/f39-build-1504172-35013/root/chroot_tmpdir/scmroot/golang-github-alexflint-filemutex'...
$ git fetch origin bfdd5f71481d2c642adcbdb2f5f1f4d8881ea756:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-alexflint-filemutex
 * [new ref]         bfdd5f71481d2c642adcbdb2f5f1f4d8881ea756 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfdd5f7 Update to 1.2.0 - Closes rhbz#2067715