$ git clone -n https://src.fedoraproject.org/rpms/kdiff3.git /var/lib/mock/f45-build-14693-462/root/chroot_tmpdir/scmroot/kdiff3
Cloning into '/var/lib/mock/f45-build-14693-462/root/chroot_tmpdir/scmroot/kdiff3'...
$ git fetch origin 1df4b5391409fafa2e882de1b6b0c39f2c94275b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdiff3
 * [new ref]         1df4b5391409fafa2e882de1b6b0c39f2c94275b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1df4b53 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild