Drone Conversion Extension: Paths Changed |

A Drone conversion extension to include/exclude pipelines and steps based on paths changed.

Please note this project requires Drone server version 1.4 or higher.

Installation

Github Cloud

1. Create a github token via https://github.com/settings/tokens with the scope ofrepo (see issue 13 for background).

2. Create a shared secret:

$ openssl rand -hex 16
bea26a2221fd8090ea38720fc445eca6

3. Download and run the plugin:

$ docker run -d \
  --publish=3000:3000 \
  --env=DRONE_DEBUG=true \
  --env=DRONE_SECRET=bea26a2221fd8090ea38720fc445eca6 \
  --env=TOKEN=9e6eij3ckzvpe9mrhnqcis6zf8dhopmm46e3pi96 \
  --env=PROVIDER=github \
  --restart=always \
  --name=converter meltwater/drone-convert-pathschanged

4. Update your Drone server configuration to include the plugin address and the shared secret.

DRONE_CONVERT_PLUGIN_ENDPOINT=http://1.2.3.4:3000
DRONE_CONVERT_PLUGIN_SECRET=bea26a2221fd8090ea38720fc445eca6

Github Server

1. Create a github token via https://your-github-server-address/settings/token with the scope of repo

2. Create a shares secret:

$ openssl rand -hex 16
bea26a2221fd8090ea38720fc445eca6

3. Download ran run the plugin:

$ docker run -d \
  --publish=3000:3000 \
  --env=DRONE_DEBUG=true \
  --env=DRONE_SECRET=bea26a2221fd8090ea38720fc445eca6 \
  --env=TOKEN=9e6eij3ckzvpe9mrhnqcis6zf8dhopmm46e3pi96 \
  --env=PROVIDER=github \
  --env=GITHUB_SERVER=https://your-github-server-address
  --restart=always \
  --name=converter meltwater/drone-convert-pathschanged

4. Update your Drone server configuration to include the plugin address and the shared secret.

DRONE_CONVERT_PLUGIN_ENDPOINT=http://1.2.3.4:3000
DRONE_CONVERT_PLUGIN_SECRET=bea26a2221fd8090ea38720fc445eca6

Bitbucket Cloud

1. Create an "App password" via https://bitbucket.org/account/settings/app-passwords and select only "Read" under "Repositories"

2. Create a shared secret:

$ openssl rand -hex 16
bea26a2221fd8090ea38720fc445eca6

3. Download and run the plugin:

$ docker run -d \
  --publish=3000:3000 \
  --env=DRONE_DEBUG=true \
  --env=DRONE_SECRET=bea26a2221fd8090ea38720fc445eca6 \
  --env=BITBUCKET_USER=youruser \
  --env=BITBUCKET_PASSWORD='yourpassword' \
  --env=PROVIDER=bitbucket \
  --restart=always \
  --name=converter meltwater/drone-convert-pathschanged

4. Update your Drone server configuration to include the plugin address and the shared secret.

DRONE_CONVERT_PLUGIN_ENDPOINT=http://1.2.3.4:3000
DRONE_CONVERT_PLUGIN_SECRET=bea26a2221fd8090ea38720fc445eca6

Stash (Bitbucket Server)

1. Create a Stash access token via https://your-bitbucket-address/plugins/servlet/access-tokens/manage with read-only rights

2. Create a shared secret:

$ openssl rand -hex 16
bea26a2221fd8090ea38720fc445eca6

3. Download and run the plugin:

$ docker run -d \
  --publish=3000:3000 \
  --env=DRONE_DEBUG=true \
  --env=DRONE_SECRET=bea26a2221fd8090ea38720fc445eca6 \
  --env=TOKEN=9e6eij3ckzvpe9mrhnqcis6zf8dhopmm46e3pi96 \
  --env=PROVIDER=bitbucket-server \
  --env=STASH_SERVER=https://your-bitbucket-server-address
  --restart=always \
  --name=converter meltwater/drone-convert-pathschanged

4. Update your Drone server configuration to include the plugin address and the shared secret.

DRONE_CONVERT_PLUGIN_ENDPOINT=http://1.2.3.4:3000
DRONE_CONVERT_PLUGIN_SECRET=bea26a2221fd8090ea38720fc445eca6

Examples

This extension uses doublestar for matching paths changed in your commit range, refer to their documentation for all supported patterns.

include

Only run a pipeline when README.md is changed:

---
kind: pipeline
name: readme

trigger:
  paths:
    include:
    - README.md

steps:
- name: message
  image: busybox
  commands:
  - echo "README.md was changed”

Only run a pipeline step when README.md is changed:

---
kind: pipeline
name: readme

steps:
- name: message
  image: busybox
  commands:
  - echo "README.md was changed”
  when:
    paths:
      include:
      - README.md

Same as above, but with an implicit include:

---
kind: pipeline
name: readme

steps:
- name: message
  image: busybox
  commands:
  - echo "README.md was changed”
  when:
    paths:
    - README.md

include and exclude

Run a pipeline step when .yml files are changed in the root, except for .drone.yml:

---
kind: pipeline
name: yaml

steps:
- name: message
  image: busybox
  commands:
  - echo "A .yml file in the root of the repo other than .drone.yml was changed"
  when:
    paths:
      include:
      - "*.yml"
      exclude:
      - .drone.yml

depends_on

When using depends_on in a pipeline step, ensure the paths rules match, otherwise your steps may run out of order.

Only run two steps when README.md is changed, one after the other:

---
kind: pipeline
name: depends_on

steps:
- name: message
  image: busybox
  commands:
  - echo "README.md was changed”
  when:
    paths:
      include:
      - README.md

- name: depends_on_message
  depends_on:
  - message
  image: busybox
  commands:
  - echo "This step runs after the message step"
  when:
    paths:
      include:
      - README.md

Changesets

The changeset is generated by comparing the list of files changed between the commit before the patch is applied and the commit after the patch is applied. As a result, the changeset for a commit may be different depending on which type of event triggered the build.

For example, the push and tag events may generate a changeset against the previous commit, where as the pull_request event may generate a changeset against the source branch. For more specifics on how before and after are set, review the webhook parser.

Known issues

Empty commits

Be careful when making empty commits with git commit --allow-empty. When an empty commit is made, no files have changed, so this plugin will return the unmodified .drone.yml back to the drone server process.

This can lead to potentially unexpected behavior, since any include or exclude rules will effectively be ignored.

YAML anchors

There is a problem in the YAML library where ordering matters during unmarshaling, see meltwater#18

This syntax will fail:

anchor: &anchor
  image: busybox
  settings:
    foo: bar

- name: test
  <<: *anchor
  when:
    event: push
    branch: master

But this will succeed:

anchor: &anchor
  image: busybox
  settings:
    foo: bar

- <<: *anchor 
  name: test
  when:
    event: push
    branch: master

Contributing

Please read CONTRIBUTING.md to understand how to submit pull requests to us, and also see our code of conduct.

Protected Repos

When this plugin is used in conjunction with protected repos, signature validation will frequently fail.

This occurs due to Drone's order of operations, in that the Drone file's signature is checked after the this plugin has rewritten sections based on the paths-changed triggers, resulting in a different signature for the file.