$ git clone -n https://src.fedoraproject.org/rpms/systemd.git /var/lib/mock/f41-build-1296719-23393/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/f41-build-1296719-23393/root/chroot_tmpdir/scmroot/systemd'...
$ git fetch origin 8ae009f929d93ef523242f15baa8e13a1526abeb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemd
 * [new ref]         8ae009f929d93ef523242f15baa8e13a1526abeb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ae009f Only add Requires on python3-zstd on Fedora