$ git clone -n https://src.fedoraproject.org/rpms/mingw-libsigc++20.git /var/lib/mock/f41-build-side-1-2648157-27335/root/chroot_tmpdir/scmroot/mingw-libsigc++20
Cloning into '/var/lib/mock/f41-build-side-1-2648157-27335/root/chroot_tmpdir/scmroot/mingw-libsigc++20'...
$ git fetch origin cf148d0b668b8e8d0d58a15f2c35a2a56819eee3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-libsigc++20
 * [new ref]         cf148d0b668b8e8d0d58a15f2c35a2a56819eee3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf148d0 convert license to SPDX