$ git clone -n https://src.fedoraproject.org/rpms/plasma-workspace-wallpapers.git /var/lib/mock/f39-build-2052650-49082/root/chroot_tmpdir/scmroot/plasma-workspace-wallpapers
Cloning into '/var/lib/mock/f39-build-2052650-49082/root/chroot_tmpdir/scmroot/plasma-workspace-wallpapers'...
$ git fetch origin 2e937932203e4259d740f941b1e27f87e050a5ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-workspace-wallpapers
 * [new ref]         2e937932203e4259d740f941b1e27f87e050a5ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e93793 5.27.10