$ git clone -n https://src.fedoraproject.org/rpms/libdispatch.git /var/lib/mock/f39-build-2500884-61676/root/chroot_tmpdir/scmroot/libdispatch
Cloning into '/var/lib/mock/f39-build-2500884-61676/root/chroot_tmpdir/scmroot/libdispatch'...
$ git fetch origin 8c8d00e7b9e5e95bde3ec2bcafa6d4e44470cf58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdispatch
 * [new ref]         8c8d00e7b9e5e95bde3ec2bcafa6d4e44470cf58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8c8d00e Updated to 5.9-RELEASE