I love being a programmer

My ZFS RAID array is resilvering. It’s a long recovery process. A report on progress looks like this:

Every 10.0s: zpool status                                             love: Tue May  4 22:32:27 2021

  pool: data
 state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Sun May  2 20:26:52 2021
        1.89T scanned out of 5.03T at 11.0M/s, 83h19m to go
        967G resilvered, 37.54% done
config:

        NAME                       STATE     READ WRITE CKSUM
        data                       DEGRADED     0     0     0
          mirror-0                 ONLINE       0     0     0
            sda                    ONLINE       0     0     0
            sdb                    ONLINE       0     0     0
          mirror-1                 DEGRADED     0     0     0
            replacing-0            DEGRADED     0     0     0
              4616223910663615641  UNAVAIL      0     0     0  was /dev/sdc1/old
              sdc                  ONLINE       0     0     0  (resilvering)
            sdd                    ONLINE       0     0     0
        cache
          nvme0n1p4                ONLINE       0     0     0

errors: No known data errors

So that 83h19m to go wasn’t in units I could easily grok, what I wanted to know was how many days. Lucky for me, I’m a computer programmer!

First I wrote watch-zpool-status.php:

#!/usr/bin/env php
<?php

main( $argv );

function main( $argv ) {

  $status = fread( STDIN, 999999 );

  if ( ! preg_match( '/, (\d+)h(\d+)m to go/', $status, $matches ) ) {

    die( "could not read zpool status.\n" );

  }

  $hours = intval( $matches[ 1 ] );
  $minutes = intval( $matches[ 2 ] );

  $minutes += $hours * 60;

  $days = $minutes / 60.0 / 24.0;

  $report = number_format( $days, 2 );

  echo "days remaining: $report\n";

}

And then I wrote watch-zpool-status.sh to run it:

#!/bin/bash

watch -n 10 'zpool status | ./watch-zpool-status.php'

So now it reports that there are 3.47 days remaining, good to know!

136 facts every web dev should know

I found this fun list of things to know: 136 facts every web dev should know before they burn out and turn to landscape painting or nude modelling.
I particularly liked these points:

124. Web dev frameworks are for organisations, not small software teams or individual developers. The value frameworks provide lies in bridging team boundaries: they create a shared understanding that aids in collaboration across groups, simplify messaging, and establish clear conventions. Frameworks turn teams in large organisations into service interfaces.
125. Individual teams or individual developers don’t have that problem, so they get less value from a web dev framework. The more opinionated the framework is and the more of the web platform it abstracts away, the more its value proposition skews towards solving organisational problems and the less value it provides to individual teams.