$ git clone -n https://src.fedoraproject.org/rpms/perl-File-pushd.git /var/lib/mock/f45-build-23624-598/root/chroot_tmpdir/scmroot/perl-File-pushd
Cloning into '/var/lib/mock/f45-build-23624-598/root/chroot_tmpdir/scmroot/perl-File-pushd'...
$ git fetch origin db4637a38943f6e9efdc1e0c48a46d61c0c07a14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-pushd
 * [new ref]         db4637a38943f6e9efdc1e0c48a46d61c0c07a14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db4637a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild