$ git clone -n https://src.fedoraproject.org/rpms/ghc-th-abstraction.git /var/lib/mock/f45-build-10855-424/root/chroot_tmpdir/scmroot/ghc-th-abstraction
Cloning into '/var/lib/mock/f45-build-10855-424/root/chroot_tmpdir/scmroot/ghc-th-abstraction'...
$ git fetch origin 3f919fb9f41d1219fb865cee720bbc56eb26792a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-th-abstraction
 * [new ref]         3f919fb9f41d1219fb865cee720bbc56eb26792a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f919fb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild