$ git clone -n https://src.fedoraproject.org/rpms/qt6-qtdeclarative.git /var/lib/mock/f40-build-740181-109556/root/chroot_tmpdir/scmroot/qt6-qtdeclarative
Cloning into '/var/lib/mock/f40-build-740181-109556/root/chroot_tmpdir/scmroot/qt6-qtdeclarative'...
$ git fetch origin bc18a600ee7e020cbe9c6067c70af6d31bc888cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt6-qtdeclarative
 * [new ref]         bc18a600ee7e020cbe9c6067c70af6d31bc888cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc18a60 6.6.0