$ git clone -n https://src.fedoraproject.org/rpms/gtkmm3.0.git /var/lib/mock/f40-build-805107-144694/root/chroot_tmpdir/scmroot/gtkmm3.0
Cloning into '/var/lib/mock/f40-build-805107-144694/root/chroot_tmpdir/scmroot/gtkmm3.0'...
$ git reset --hard ddc762a2d6429d98c3a31fb6895a50c129e34668
HEAD is now at ddc762a Update to 3.24.9