$ git clone -n https://src.fedoraproject.org/rpms/git.git /var/lib/mock/f41-build-side-1-2805484-32863/root/chroot_tmpdir/scmroot/git
Cloning into '/var/lib/mock/f41-build-side-1-2805484-32863/root/chroot_tmpdir/scmroot/git'...
$ git fetch origin 2354ed404127937eb64df75d2e178d59d81f6b71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/git
 * [new ref]         2354ed404127937eb64df75d2e178d59d81f6b71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2354ed4 repair bogus date in the changelog