$ git clone -n https://src.fedoraproject.org/rpms/libsoup.git /var/lib/mock/f40-build-2153413-50914/root/chroot_tmpdir/scmroot/libsoup
Cloning into '/var/lib/mock/f40-build-2153413-50914/root/chroot_tmpdir/scmroot/libsoup'...
$ git fetch origin eced94f28328e4e7de08d73245bc4fa28ddc505a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libsoup
 * [new ref]         eced94f28328e4e7de08d73245bc4fa28ddc505a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eced94f Fix building against libxml2 2.12.0