Support systems that use quota instead of df

[ronilaukkarinen]

Flood uses df -T in server/util/diskUsageUtil.ts where it defines the disks in use. However, I have a box that has a jail and df is useless as it shows all other filesystems we don't use in our jail. Users have to use quota to get their own data usage on their space.

As quota uses different format than df it's not enough to just change the command. We also need more arguments to get all data in the same line:

$ quota -w --show-mntpoint
Disk quotas for user rolle (uid 1020): 
     Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
/dev/sdb1 /home2 1059357988  3905945600 3905945600          266012       0       0  

I got flood working with quota by modifying the linux option like so:

  linux: (timeout) =>
    spawnAsync(
      'quota',
      ['-w', '--show-mntpoint'],
      {
        timeout: timeout,
      },
      MAX_BUFFER_SIZE,
    ).then((stdout) =>
      stdout
        .trim()
        .split('\n')
        .slice(1)
        .map((disk) => disk.split(/\s+/))
        .filter((disk) => filterMountPoint(disk[6]))
        .filter((disk) => !['devtmpfs', 'squashfs', 'tmpfs', 'overlay'].includes(disk[1]))
        .map(([_dev, target, blocks, quota, limit, quota2, limit2, grace]) => {
          return {
            size: Number.parseInt(quota, 10) * 1024,
            used: Number.parseInt(blocks, 10) * 1024,
            avail: (Number.parseInt(quota, 10) * 1024) - (Number.parseInt(blocks, 10) * 1024),
            target,
          };
        }),
    ),

This works.

I'm not very experienced with ts/js but this could be an option in Flood. Just an idea and working concept I'd like to share. Thoughts?