$ git clone -n https://src.fedoraproject.org/rpms/libsigc++.git /var/lib/mock/f31-build-100257-33241/root/chroot_tmpdir/scmroot/libsigc++
Cloning into '/var/lib/mock/f31-build-100257-33241/root/chroot_tmpdir/scmroot/libsigc++'...
$ git reset --hard 5fb1115d35b19d9adeedce36bbef071896c53117
HEAD is now at 5fb1115 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild