$ git clone -n https://src.fedoraproject.org/rpms/jpegxl.git /var/lib/mock/f41-build-808024-145615/root/chroot_tmpdir/scmroot/jpegxl
Cloning into '/var/lib/mock/f41-build-808024-145615/root/chroot_tmpdir/scmroot/jpegxl'...
$ git fetch origin a0c453281b74672b36405b6107f25137d5b8af89:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jpegxl
 * [new ref]         a0c453281b74672b36405b6107f25137d5b8af89 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0c4532 Rebuild for openexr 3.2.4