$ git clone -n https://src.fedoraproject.org/rpms/mongoose.git /var/lib/mock/f41-build-1037677-18807/root/chroot_tmpdir/scmroot/mongoose
Cloning into '/var/lib/mock/f41-build-1037677-18807/root/chroot_tmpdir/scmroot/mongoose'...
$ git fetch origin 744d53357fe48b27580e040c768d8acb004e6e5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mongoose
 * [new ref]         744d53357fe48b27580e040c768d8acb004e6e5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 744d533 Eliminate use of obsolete %patchN syntax (#2283636)