$ git clone -n https://src.fedoraproject.org/rpms/libpsl.git /var/lib/mock/f40-build-774623-127712/root/chroot_tmpdir/scmroot/libpsl
Cloning into '/var/lib/mock/f40-build-774623-127712/root/chroot_tmpdir/scmroot/libpsl'...
$ git fetch origin 86a81a02e41dbac8471781e18f93b3d6b6c64665:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libpsl
 * [new ref]         86a81a02e41dbac8471781e18f93b3d6b6c64665 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86a81a0 Update to 0.21.5