$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f31-build-46893-26746/root/thebuilddir/tmp/scmroot/glibc
Cloning into '/var/lib/mock/f31-build-46893-26746/root/thebuilddir/tmp/scmroot/glibc'...
$ git reset --hard 8797f878024852d6febbec8a4b79296e99b47e3a
HEAD is now at 8797f87 Auto-sync with upstream branch master