$ git clone -n https://src.fedoraproject.org/rpms/ghc-appar.git /var/lib/mock/f45-build-9972-412/root/chroot_tmpdir/scmroot/ghc-appar
Cloning into '/var/lib/mock/f45-build-9972-412/root/chroot_tmpdir/scmroot/ghc-appar'...
$ git fetch origin db8502c0a7bd5bddd64b409e22f8ef9193ded7e4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-appar
 * [new ref]         db8502c0a7bd5bddd64b409e22f8ef9193ded7e4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db8502c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild