$ git clone -n https://src.fedoraproject.org/rpms/kf5-kwindowsystem.git /var/lib/mock/f40-build-786833-134632/root/chroot_tmpdir/scmroot/kf5-kwindowsystem
Cloning into '/var/lib/mock/f40-build-786833-134632/root/chroot_tmpdir/scmroot/kf5-kwindowsystem'...
$ git fetch origin 74ca1ed1c2c2f5f84118efcb7132f10132d36598:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-kwindowsystem
 * [new ref]         74ca1ed1c2c2f5f84118efcb7132f10132d36598 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74ca1ed 5.115.0