$ git clone -n https://src.fedoraproject.org/rpms/isa-l.git /var/lib/mock/f45-build-14253-458/root/chroot_tmpdir/scmroot/isa-l
Cloning into '/var/lib/mock/f45-build-14253-458/root/chroot_tmpdir/scmroot/isa-l'...
$ git fetch origin b7554319e148d157a07f3fc9da7d2ca734cef0e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/isa-l
 * [new ref]         b7554319e148d157a07f3fc9da7d2ca734cef0e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b755431 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild