Cool new bash-completions of libguestfs tools

Starting in libguestfs ≥ 1.21.23-2, bash tab completions of guestfish, guestmount and virt-* tools have been rewritten and greatly improved.

Note you will need to install the libguestfs-bash-completion package to enable this feature.

You can now tab complete all long options on most tools:

$ virt-df --[tab]
--add             --domain          --human-readable  --uuid
--connect         --format          --inodes          --verbose
--csv             --help            --one-per-guest   --version
$ virt-resize --[tab]
--align-first          --help                 --no-extra-partition
--alignment            --ignore               --ntfsresize-force
--debug                --lvexpand             --output-format
--debug-gc             --lv-expand            --quiet
--delete               --LVexpand             --resize
--dryrun               --LV-expand            --resize-force
--dry-run              --machine-readable     --shrink
--expand               --no-copy-boot-loader  --version
--format               --no-expand-content    

Where appropriate, the -d option will now expand to the list of libvirt domains:

# virt-df -d [tab]
archlinux20121201x64  f19rawhidex32
f18x64                f19rawhidex64

Finally, guestfish commands are expanded on the command line:

$ guestfish add /tmp/disk : run : list-[tab]
list-9p              list-events          list-md-devices
list-devices         list-filesystems     list-partitions
list-disk-labels     list-ldm-partitions  
list-dm-devices      list-ldm-volumes     

To make this less intrusive, so you can really use it daily, I left the default readline expansions enabled. This means that filenames and so on can continue to be used in every position on the command line, and should mean that bash completions won’t try to be cleverer than the user.

Libguestfs bash completions are also demand-loaded now, so that if you’re not using them, they don’t consume any resources in the shell.

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