$ git clone -n https://src.fedoraproject.org/rpms/kde-gtk-config.git /var/lib/mock/f40-build-2111492-50663/root/chroot_tmpdir/scmroot/kde-gtk-config
Cloning into '/var/lib/mock/f40-build-2111492-50663/root/chroot_tmpdir/scmroot/kde-gtk-config'...
$ git fetch origin 3faf2e8c1183a6c52fca223f504c4bca2e039b2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kde-gtk-config
 * [new ref]         3faf2e8c1183a6c52fca223f504c4bca2e039b2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3faf2e8 5.91.0