$ git clone -n https://src.fedoraproject.org/rpms/jpegxl.git /var/lib/mock/f41-build-side-1-3050290-37971/root/chroot_tmpdir/scmroot/jpegxl
Cloning into '/var/lib/mock/f41-build-side-1-3050290-37971/root/chroot_tmpdir/scmroot/jpegxl'...
$ git fetch origin 33965822fb52c8e6565a4c6a20b141c326f80312:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jpegxl
 * [new ref]         33965822fb52c8e6565a4c6a20b141c326f80312 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3396582 Fix upgrade path