$ git clone -n https://src.fedoraproject.org/rpms/libgadu.git /var/lib/mock/f40-build-785610-134039/root/chroot_tmpdir/scmroot/libgadu
Cloning into '/var/lib/mock/f40-build-785610-134039/root/chroot_tmpdir/scmroot/libgadu'...
$ git fetch origin f115c68d7d01c764e976c0b7ee895a835ecca538:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgadu
 * [new ref]         f115c68d7d01c764e976c0b7ee895a835ecca538 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f115c68 Drop redundant test dependency perl-Test-Vars (rhbz#2260472)