$ git clone -n https://src.fedoraproject.org/rpms/kde-gtk-config.git /var/lib/mock/f39-build-1629245-39531/root/chroot_tmpdir/scmroot/kde-gtk-config
Cloning into '/var/lib/mock/f39-build-1629245-39531/root/chroot_tmpdir/scmroot/kde-gtk-config'...
$ git fetch origin 42c07a28b580629bf4d8f33fa1f8de3e7af2c02e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kde-gtk-config
 * [new ref]         42c07a28b580629bf4d8f33fa1f8de3e7af2c02e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 42c07a2 5.27.9