[Libguestfs] [PATCH v2] dib: handle unsetting functions in environment

When I turned off debug and actually looked at the normal output, this is a bit noisy... [jeckersb@baozi libguestfs]$ ./run virt-dib -B ~/git/diskimage-builder/lib/ --element-path ~/git/diskimage-builder/elements/ fedora-minimal [ 0.0] Elements: base fedora-minimal [ 0.0] Expanded elements: base dib-init-system dib-run-parts fedora-minimal install-types package-installs pkg-map redhat-common rpm-distro yum yum-minimal [ 0.0] Carried environment variables: [ 0.0] Preparing auxiliary data [ 0.2] Running: extra-data.d/10-create-pkg-map-dir /tmp/dib.dQ8W3Z/aux/fake-bin/sudo: line 39: unset: `BASH_FUNC_module()': not a valid identifier /tmp/dib.dQ8W3Z/aux/fake-bin/sudo: line 39: unset: `BASH_FUNC_scl()': not a valid identifier /tmp/dib.dQ8W3Z/aux/fake-bin/sudo: line 39: unset: `BASH_FUNC_module()': not a valid identifier /tmp/dib.dQ8W3Z/aux/fake-bin/sudo: line 39: unset: `BASH_FUNC_scl()': not a valid identifier /tmp/dib.dQ8W3Z/aux/fake-bin/sudo: line 39: unset: `BASH_FUNC_module()': not a valid identifier /tmp/dib.dQ8W3Z/aux/fake-bin/sudo: line 39: unset: `BASH_FUNC_scl()': not a valid identifier [ 0.2] Running: extra-data.d/50-store-build-settings [ 0.2] Running: extra-data.d/99-enable-install-types [ 0.2] Running: extra-data.d/99-squash-package-install [ 0.3] Running: extra-data.d/99-yum-repo-conf [ 0.3] Opening the disks ...etc... So this one instead dumps the noise into /dev/null