$ git clone -n https://src.fedoraproject.org/rpms/ghc-SafeSemaphore.git /var/lib/mock/f45-build-9943-411/root/chroot_tmpdir/scmroot/ghc-SafeSemaphore
Cloning into '/var/lib/mock/f45-build-9943-411/root/chroot_tmpdir/scmroot/ghc-SafeSemaphore'...
$ git fetch origin b808e6ae329312000588eecbd87f5258765fb3e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-SafeSemaphore
 * [new ref]         b808e6ae329312000588eecbd87f5258765fb3e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b808e6a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild