OpenWRT package dependency debugging script

opkg-deps.js

#!/usr/bin/env node

'use strict'

/*
Usage:
- first dump package dependencies with "opkg status > /tmp/status" and copy the file "scp -O root@your-router:/tmp/status ./dependencies"
- then use the script:
  $ node opkg-deps.js ./dependencies why luci
  $ node opkg-deps.js ./dependencies search iptables
  $ node opkg-deps.js ./dependencies tree luci # same as why, but lists deps with a tree
*/

const fs = require('fs')

const data = String(fs.readFileSync(process.argv[2]))

let list = []
let cur = {}
let curkey = null

data.split('\n').forEach(l => {
  if (!l.trim()) {
    list.push(cur)
    cur = {}
    curkey = null
  } else {
    if (l.indexOf(':') !== -1) {
      let [key, val] = l.split(':')
      key = key.toLowerCase()
      if (!val) {
        cur[key] = []
        curkey = key
      } else {
        cur[key] = val.trim()
      }
    }
  }
})

list = list.filter(p => Boolean(p.package))

list.forEach(i => {
  i.depends = i.depends ? i.depends.split(', ').map(v => v.trim()) : []
})

list.forEach(i => {
  i.dependents = list.filter(i2 => i2.depends.indexOf(i.package) !== -1)
})

function showTree(pkg, indent = 0) {
  const s = '  '.repeat(indent)
  console.log('%s+ %s', s, pkg.package)
  pkg.dependents.forEach(d => {
    displayWhy(d, indent + 1)
  })
}

function displayWhy(pkg, s = []) {
  s = s.concat([pkg.package])
  if (!pkg.dependents.length) console.log(s.reverse().join(' > '))
  pkg.dependents.forEach(dep => {
    displayWhy(dep, s)
  })
}

const arg = process.argv[3]

switch(arg) {
case 'why': {

const pkgName = process.argv[4]
const pkg = list.filter(i => i.package === pkgName)[0]
if (!pkg) return console.error('%s not found - use search perhaps', pkgName)

displayWhy(pkg)

break

}

case 'tree': {

const pkgName = process.argv[4]
const pkg = list.filter(i => i.package === pkgName)[0]
if (!pkg) return console.error('%s not found - use search perhaps', pkgName)

showTree(pkg)

break

}

case 'search':

const str = process.argv[4]
console.log(list.filter(i => i.package.indexOf(str) !== -1).map(i => i.package).join(', '))

break

}