$ git clone -n https://src.fedoraproject.org/rpms/fish.git /var/lib/mock/f45-build-8988-397/root/chroot_tmpdir/scmroot/fish
Cloning into '/var/lib/mock/f45-build-8988-397/root/chroot_tmpdir/scmroot/fish'...
$ git fetch origin f5929c88a5deb58a17f3962cf2e1b1b528c411bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fish
 * [new ref]         f5929c88a5deb58a17f3962cf2e1b1b528c411bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5929c8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild