$ git clone -n https://src.fedoraproject.org/rpms/rust-jpegxl-sys.git /var/lib/mock/f45-build-42739-796/root/chroot_tmpdir/scmroot/rust-jpegxl-sys
Cloning into '/var/lib/mock/f45-build-42739-796/root/chroot_tmpdir/scmroot/rust-jpegxl-sys'...
$ git fetch origin 48a4db402585a3473e35fc28c24a20d534eb21c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-jpegxl-sys
 * [new ref]         48a4db402585a3473e35fc28c24a20d534eb21c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48a4db4 Update to version 0.12.1+libjxl-0.11.2