$ git clone -n https://src.fedoraproject.org/rpms/evolution.git /var/lib/mock/f40-build-2094994-50371/root/chroot_tmpdir/scmroot/evolution
Cloning into '/var/lib/mock/f40-build-2094994-50371/root/chroot_tmpdir/scmroot/evolution'...
$ git fetch origin 4a21eb4e738a86bf0f05df1609230abe0d8752e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/evolution
 * [new ref]         4a21eb4e738a86bf0f05df1609230abe0d8752e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a21eb4 Update to 3.50.2