$ git clone -n https://src.fedoraproject.org/rpms/xfsdump.git /var/lib/mock/f45-build-38883-730/root/chroot_tmpdir/scmroot/xfsdump
Cloning into '/var/lib/mock/f45-build-38883-730/root/chroot_tmpdir/scmroot/xfsdump'...
$ git fetch origin faf3dcdef77ece16c16a1c5ba4456c44f84dd7b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfsdump
 * [new ref]         faf3dcdef77ece16c16a1c5ba4456c44f84dd7b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at faf3dcd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild