Re: [Libguestfs] [PATCH] New API: btrfs_device_stats

Hi, On Thursday 18 June 2015 11:01:37 Cao jin wrote: > > Speaking of this: you said that you have a colleague working on > > btrfs-progs? What about suggesting to create some machine-parseable > > output (csv, xml, yaml, json, whatever) so extracting the results of > > btrfs tools is a lot more easy? > > > > Yes, I forward your suggestion and consult him, the result is not > surprised:( Here is what I learned from him: > For the btrfs-progs cmds who output strings, the output are plain, > don`t have patterns. Seen some guys who want a formatted output, they do > a filter by themself, it not reasonable to ask btrfs-progs to output > formatted strings. This is exactly the issue here: every btrfs command has a totally different formatting for its output. Just let him take a look at all the commands implemented so far in libguestfs, you can easily spot that: - btrfs subvolume list - btrfs subvolume show - btrfs qgroup show - btrfs balance status - btrfs scrub status - btrfs device stats all have different custom parsers for each of their outputs. Compare that to e.g. the -m parameter for parted, so it outputs fields separated by semi-colon.