$ git clone -n https://src.fedoraproject.org/rpms/gdm.git /var/lib/mock/f31-build-53437-27850/root/chroot_tmpdir/scmroot/gdm
Cloning into '/var/lib/mock/f31-build-53437-27850/root/chroot_tmpdir/scmroot/gdm'...
$ git reset --hard bb090eb3b6ee368c7f30f0c4b3567435a785e451
HEAD is now at bb090eb avoid wayland if nomodeset is on kernel command line