$ git clone -n https://src.fedoraproject.org/rpms/libmcrypt.git /var/lib/mock/f41-build-886452-16637/root/chroot_tmpdir/scmroot/libmcrypt
Cloning into '/var/lib/mock/f41-build-886452-16637/root/chroot_tmpdir/scmroot/libmcrypt'...
$ git fetch origin dff582899fbe6133ab796fb753e4e5a5b183c2d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmcrypt
 * [new ref]         dff582899fbe6133ab796fb753e4e5a5b183c2d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dff5828 Eliminate use of obsolete %patchN syntax (#2283636)