$ git clone -n https://src.fedoraproject.org/rpms/rust-fs_at.git /var/lib/mock/f40-build-2650200-66874/root/chroot_tmpdir/scmroot/rust-fs_at
Cloning into '/var/lib/mock/f40-build-2650200-66874/root/chroot_tmpdir/scmroot/rust-fs_at'...
error: cannot fork() for fetch-pack: Resource temporarily unavailable