Periodic Pull Requests Labeler

A GitHub action to automatically label all PRs based on changed files according to file patterns.

Action is meant to be run as periodic job. This is needed to workaround issues regarding lack of write access when executed from fork which is a common problem when using https://github.com/actions/labeler.

Workflow

name: Pull Request Labeler
on:
  schedule:
    - cron: '*/10 * * * *'
jobs:
  labeler:
    runs-on: ubuntu-latest
    steps:
      - uses: docker://docker.io/ilyam8/periodic-pr-labeler:v0.1.1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          GITHUB_REPOSITORY: ${{ github.repository }}
          LABEL_MAPPINGS_FILE: .github/labeler.yml

Label mappings file

This file is in YaML format. It contains a list of labels and patterns to match to apply the label. By default, this action uses .github/labeler.yml located in repository from GITHUB_REPOSITORY as a source of pattern matchers.

# Add 'label1' to any changes within 'example' folder or any subfolders
label1:
  - example/**/*

# Add 'label2' to any file changes within 'example2' folder
label2: example2/*

# Add 'label3' label to any change to *.spec.js files within the source dir
label3:
  - src/**/*.spec.js

# Add 'label4' label to any change within the 'core' package
label4:
  - package/core/*
  - package/core/**/*

Path exclusion

Pattern can be negated to stop searching through the remaining patterns. To exclude path from searching prepend pattern with !.

Using path exclusion keep in mind:

• negated pattern must be quoted.
• order is not relevant. Add label condition: match at least one positive pattern AND do not match any of negated patterns.

# Add 'label5' to any changes within 'package' folder or any subfolders except `core` and `installer` subfolders
label5:
  - package/*
  - package/**/*
  - "!package/core/*"
  - "!package/installer/*"

Pattern syntax

This action uses gobwas/glob library for pattern matches.

pattern:
    { term }

term:
    `*`         matches any sequence of non-separator characters
    `**`        matches any sequence of characters
    `?`         matches any single non-separator character
    `[` [ `!` ] { character-range } `]`
                character class (must be non-empty)
    `{` pattern-list `}`
                pattern alternatives
    c           matches character c (c != `*`, `**`, `?`, `\`, `[`, `{`, `}`)
    `\` c       matches character c

character-range:
    c           matches character c (c != `\\`, `-`, `]`)
    `\` c       matches character c
    lo `-` hi   matches character c for lo <= c <= hi

pattern-list:
    pattern { `,` pattern }
                comma-separated (without spaces) patterns

To get better understanding see examples.

CLI

See all available options:

Usage:
  labeler [OPTION]...

Application Options:
  -r, --repository=           Github repository slug
  -t, --token=                GitHub token
  -m, --label-mappings=       Label mappings file on github (default: .github/labeler.yml)
  -M, --label-mappings-local= Label mappings file on the local system
  -d, --dry-run               Dry run, labels won't be applied, only reported

Help Options:
  -h, --help                  Show this help message

Dry-run mode

Labeler has dry-run mode. In this mode it doesn't add any labels.

Reported information:

• no match means all changed files don't match any pattern.
• has all means that pull request has all expected labels.
• list of labels means that pull request has no expected labels. List of labels to add.

Example output:

DEBU[0003] found 38 open pull requests
DEBU[0003] PR netdata/netdata#6447                       labels="has all"
DEBU[0004] PR netdata/netdata#6390                       labels="has all"
DEBU[0004] PR netdata/netdata#7271                       labels="no match"
DEBU[0004] PR netdata/netdata#6145                       labels="has all"
DEBU[0007] PR netdata/netdata#7945                       labels="has all"
DEBU[0008] PR netdata/netdata#7216                       labels="has all"
DEBU[0008] PR netdata/netdata#7943                       labels="has all"
DEBU[0008] PR netdata/netdata#7185 [dry run]             labels="[area/packaging area/collectors area/external/python area/docs]"
DEBU[0009] PR netdata/netdata#6988                       labels="has all"
DEBU[0009] PR netdata/netdata#7902                       labels="has all"
DEBU[0009] PR netdata/netdata#7962 [dry run]             labels="[area/external area/packaging area/collectors area/docs]"
DEBU[0009] PR netdata/netdata#7377 [dry run]             labels="[area/collectors area/packaging area/external/python area/docs area/web]"
DEBU[0010] PR netdata/netdata#7423                       labels="has all"
DEBU[0010] PR netdata/netdata#7754                       labels="has all"
DEBU[0010] PR netdata/netdata#7942 [dry run]             labels="[area/packaging area/docs]"
DEBU[0011] PR netdata/netdata#7951                       labels="has all"
DEBU[0011] PR netdata/netdata#7988                       labels="has all"
DEBU[0011] PR netdata/netdata#6936                       labels="has all"
DEBU[0011] PR netdata/netdata#7104                       labels="has all"
DEBU[0012] PR netdata/netdata#7769                       labels="has all"
DEBU[0012] PR netdata/netdata#7979 [dry run]             labels="[area/packaging area/collectors area/docs area/web]"
DEBU[0012] PR netdata/netdata#8025                       labels="has all"