$ git clone -n https://src.fedoraproject.org/rpms/webkit2gtk4.0.git /var/lib/mock/f40-build-2403140-60556/root/chroot_tmpdir/scmroot/webkit2gtk4.0
Cloning into '/var/lib/mock/f40-build-2403140-60556/root/chroot_tmpdir/scmroot/webkit2gtk4.0'...
$ git fetch origin 034fe06bb7e4a54a50cb6f291e19f6ccd946eafe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/webkit2gtk4.0
 * [new ref]         034fe06bb7e4a54a50cb6f291e19f6ccd946eafe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 034fe06 Rebuild for jpegxl (libjxl) 0.9.2 with soname bump