$ git clone -n https://src.fedoraproject.org/rpms/perl-Swim.git /var/lib/mock/f45-build-26431-617/root/chroot_tmpdir/scmroot/perl-Swim
Cloning into '/var/lib/mock/f45-build-26431-617/root/chroot_tmpdir/scmroot/perl-Swim'...
$ git fetch origin 7833d5c33b38ef43c8c6e5db92648bd9ea7c21b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Swim
 * [new ref]         7833d5c33b38ef43c8c6e5db92648bd9ea7c21b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7833d5c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild