$ git clone -n https://src.fedoraproject.org/rpms/qt5ct.git /var/lib/mock/f40-build-738994-108606/root/chroot_tmpdir/scmroot/qt5ct
Cloning into '/var/lib/mock/f40-build-738994-108606/root/chroot_tmpdir/scmroot/qt5ct'...
$ git fetch origin 66e353a11ea60229dc21000a541144b1aa0ecd38:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qt5ct
 * [new ref]         66e353a11ea60229dc21000a541144b1aa0ecd38 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 66e353a Rebuild (qt5)