$ git clone -n https://src.fedoraproject.org/rpms/nbdkit.git /var/lib/mock/f39-test-2569731-62238/root/chroot_tmpdir/scmroot/nbdkit
Cloning into '/var/lib/mock/f39-test-2569731-62238/root/chroot_tmpdir/scmroot/nbdkit'...
$ git fetch origin e0f1c5b33a9f55922831c7050fa897ac553d2140:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nbdkit
 * [new ref]         e0f1c5b33a9f55922831c7050fa897ac553d2140 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e0f1c5b New upstream stable version 1.36.4