$ git clone -n https://src.fedoraproject.org/rpms/glibmm2.68.git /var/lib/mock/f40-build-752728-116843/root/chroot_tmpdir/scmroot/glibmm2.68
Cloning into '/var/lib/mock/f40-build-752728-116843/root/chroot_tmpdir/scmroot/glibmm2.68'...
$ git reset --hard 08127ebd1ba9b065482b935c66338ce0f191d86d
HEAD is now at 08127eb Update to 2.78.0