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Merge pull request #85 from dorny/improve-robustness
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Improve robustness of change detection
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@dorny
dorny committed Apr 19, 2021
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# Paths Changes Filter

This [Github Action](https://github.com/features/actions) enables conditional execution of workflow steps and jobs,
based on the files modified by pull request, feature branch or in pushed commits.
[Github Action](https://github.com/features/actions) that enables conditional execution of workflow steps and jobs, based on the files modified by pull request, on a feature
branch, or by the recently pushed commits.

It saves time and resources especially in monorepo setups, where you can run slow tasks (e.g. integration tests or deployments) only for changed components.
Run slow tasks like integration tests or deployments only for changed components. It saves time and resources, especially in monorepo setups.
Github workflows built-in [path filters](https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#onpushpull_requestpaths)
don't allow this because they don't work on a level of individual jobs or steps.

Expand All @@ -17,27 +17,27 @@ don't allow this because they don't work on a level of individual jobs or steps.
- Workflow triggered by **[pull_request](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#pull_request)**
or **[pull_request_target](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#pull_request_target)** event
- Changes are detected against the pull request base branch
- Uses Github REST API to fetch list of modified files
- Uses Github REST API to fetch a list of modified files
- **Feature branches:**
- Workflow triggered by **[push](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push)**
or any other **[event](https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows)**
- The `base` input parameter must not be the same as the branch that triggered the workflow
- Changes are detected against the merge-base with configured base branch or default branch
- Changes are detected against the merge-base with the configured base branch or the default branch
- Uses git commands to detect changes - repository must be already [checked out](https://github.com/actions/checkout)
- **Master, Release or other long-lived branches:**
- **Master, Release, or other long-lived branches:**
- Workflow triggered by **[push](https://docs.github.com/en/actions/reference/events-that-trigger-workflows#push)** event
when `base` input parameter is same as the branch that triggered the workflow:
when `base` input parameter is the same as the branch that triggered the workflow:
- Changes are detected against the most recent commit on the same branch before the push
- Workflow triggered by any other **[event](https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows)**
when `base` input parameter is commit SHA:
- Changes are detected against the provided `base` commit
- Workflow triggered by any other **[event](https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows)**
when `base` input parameter is same as the branch that triggered the workflow:
- Changes are detected from last commit
when `base` input parameter is the same as the branch that triggered the workflow:
- Changes are detected from the last commit
- Uses git commands to detect changes - repository must be already [checked out](https://github.com/actions/checkout)
- **Local changes**
- Workflow triggered by any event when `base` input parameter is set to `HEAD`
- Changes are detected against current HEAD
- Changes are detected against the current HEAD
- Untracked files are ignored

## Example
Expand All @@ -57,10 +57,10 @@ For more scenarios see [examples](#examples) section.

## Notes:
- Paths expressions are evaluated using [picomatch](https://github.com/micromatch/picomatch) library.
Documentation for path expression format can be found on project github page.
Documentation for path expression format can be found on the project GitHub page.
- Picomatch [dot](https://github.com/micromatch/picomatch#options) option is set to true.
Globbing will match also paths where file or folder name starts with a dot.
- It's recommended to quote your path expressions with `'` or `"`. Otherwise you will get an error if it starts with `*`.
Globbing will also match paths where file or folder name starts with a dot.
- It's recommended to quote your path expressions with `'` or `"`. Otherwise, you will get an error if it starts with `*`.
- Local execution with [act](https://github.com/nektos/act) works only with alternative runner image. Default runner doesn't have `git` binary.
- Use: `act -P ubuntu-latest=nektos/act-environments-ubuntu:18.04`

Expand All @@ -72,54 +72,52 @@ For more scenarios see [examples](#examples) section.
- Improved listing of matching files with `list-files: shell` and `list-files: escape` options
- Paths expressions are now evaluated using [picomatch](https://github.com/micromatch/picomatch) library

For more information see [CHANGELOG](https://github.com/dorny/paths-filter/blob/master/CHANGELOG.md)
For more information, see [CHANGELOG](https://github.com/dorny/paths-filter/blob/master/CHANGELOG.md)

# Usage

```yaml
- uses: dorny/paths-filter@v2
with:
# Defines filters applied to detected changed files.
# Each filter has a name and list of rules.
# Each filter has a name and a list of rules.
# Rule is a glob expression - paths of all changed
# files are matched against it.
# Rule can optionally specify if the file
# should be added, modified or deleted.
# For each filter there will be corresponding output variable to
# should be added, modified, or deleted.
# For each filter, there will be a corresponding output variable to
# indicate if there's a changed file matching any of the rules.
# Optionally there can be a second output variable
# Optionally, there can be a second output variable
# set to list of all files matching the filter.
# Filters can be provided inline as a string (containing valid YAML document)
# or as a relative path to separate file (e.g.: .github/filters.yaml).
# Multiline string is evaluated as embedded filter definition,
# single line string is evaluated as relative path to separate file.
# Filters can be provided inline as a string (containing valid YAML document),
# or as a relative path to a file (e.g.: .github/filters.yaml).
# Filters syntax is documented by example - see examples section.
filters: ''

# Branch, tag or commit SHA against which the changes will be detected.
# If it references same branch it was pushed to,
# Branch, tag, or commit SHA against which the changes will be detected.
# If it references the same branch it was pushed to,
# changes are detected against the most recent commit before the push.
# Otherwise it uses git merge-base to find best common ancestor between
# Otherwise, it uses git merge-base to find the best common ancestor between
# current branch (HEAD) and base.
# When merge-base is found, it's used for change detection - only changes
# introduced by current branch are considered.
# introduced by the current branch are considered.
# All files are considered as added if there is no common ancestor with
# base branch or no previous commit.
# This option is ignored if action is triggered by pull_request event.
# Default: repository default branch (e.g. master)
base: ''

# Git reference (e.g. branch name) from which the changes will be detected.
# Useful when workflow can be triggered only on default branch (e.g. repository_dispatch event)
# but you want to get changes on different branch.
# Useful when workflow can be triggered only on the default branch (e.g. repository_dispatch event)
# but you want to get changes on a different branch.
# This option is ignored if action is triggered by pull_request event.
# default: ${{ github.ref }}
ref:

# How many commits are initially fetched from base branch.
# How many commits are initially fetched from the base branch.
# If needed, each subsequent fetch doubles the
# previously requested number of commits until the merge-base
# is found or there are no more commits in the history.
# is found, or there are no more commits in the history.
# This option takes effect only when changes are detected
# using git against base branch (feature branch workflow).
# Default: 100
Expand All @@ -128,35 +126,35 @@ For more information see [CHANGELOG](https://github.com/dorny/paths-filter/blob/
# Enables listing of files matching the filter:
# 'none' - Disables listing of matching files (default).
# 'csv' - Coma separated list of filenames.
# If needed it uses double quotes to wrap filename with unsafe characters.
# 'json' - Matching files paths are formatted as JSON array.
# 'shell' - Space delimited list usable as command line argument list in Linux shell.
# If needed it uses single or double quotes to wrap filename with unsafe characters.
# 'escape'- Space delimited list usable as command line argument list in Linux shell.
# If needed, it uses double quotes to wrap filename with unsafe characters.
# 'json' - File paths are formatted as JSON array.
# 'shell' - Space delimited list usable as command-line argument list in Linux shell.
# If needed, it uses single or double quotes to wrap filename with unsafe characters.
# 'escape'- Space delimited list usable as command-line argument list in Linux shell.
# Backslash escapes every potentially unsafe character.
# Default: none
list-files: ''

# Relative path under $GITHUB_WORKSPACE where the repository was checked out.
working-directory: ''

# Personal access token used to fetch list of changed files
# Personal access token used to fetch a list of changed files
# from Github REST API.
# It's used only if action is triggered by pull request event.
# It's only used if action is triggered by a pull request event.
# Github token from workflow context is used as default value.
# If empty string is provided, action falls back to detect
# If an empty string is provided, the action falls back to detect
# changes using git commands.
# Default: ${{ github.token }}
token: ''
```

## Outputs
- For each filter it sets output variable named by the filter to the text:
- For each filter, it sets output variable named by the filter to the text:
- `'true'` - if **any** of changed files matches any of filter rules
- `'false'` - if **none** of changed files matches any of filter rules
- For each filter it sets output variable with name `${FILTER_NAME}_count` to the count of matching files.
- If enabled, for each filter it sets output variable with name `${FILTER_NAME}_files`. It will contain list of all files matching the filter.
- `changes` - JSON array with names of all filters matching any of changed files.
- For each filter, it sets an output variable with the name `${FILTER_NAME}_count` to the count of matching files.
- If enabled, for each filter it sets an output variable with the name `${FILTER_NAME}_files`. It will contain a list of all files matching the filter.
- `changes` - JSON array with names of all filters matching any of the changed files.

# Examples

Expand Down Expand Up @@ -283,7 +281,7 @@ jobs:
```yaml
on:
pull_request:
branches: # PRs to following branches will trigger the workflow
branches: # PRs to the following branches will trigger the workflow
- master
- develop
jobs:
Expand Down Expand Up @@ -329,7 +327,7 @@ jobs:
```yaml
on:
push:
branches: # Push to following branches will trigger the workflow
branches: # Push to the following branches will trigger the workflow
- master
- develop
- release/**
Expand All @@ -341,8 +339,8 @@ jobs:
- uses: dorny/paths-filter@v2
id: filter
with:
# Use context to get branch where commits were pushed.
# If there is only one long lived branch (e.g. master),
# Use context to get the branch where commits were pushed.
# If there is only one long-lived branch (e.g. master),
# you can specify it directly.
# If it's not configured, the repository default branch is used.
base: ${{ github.ref }}
Expand All @@ -366,11 +364,11 @@ jobs:
steps:
- uses: actions/checkout@v2

# Some action which modifies files tracked by git (e.g. code linter)
# Some action that modifies files tracked by git (e.g. code linter)
- uses: johndoe/some-action@v1

# Filter to detect which files were modified
# Changes could be for example automatically committed
# Changes could be, for example, automatically committed
- uses: dorny/paths-filter@v2
id: filter
with:
Expand Down Expand Up @@ -421,10 +419,10 @@ jobs:
id: filter
with:
# Changed file can be 'added', 'modified', or 'deleted'.
# By default the type of change is not considered.
# Optionally it's possible to specify it using nested
# dictionary, where type(s) of change composes the key.
# Multiple change types can be specified using `|` as delimiter.
# By default, the type of change is not considered.
# Optionally, it's possible to specify it using nested
# dictionary, where the type of change composes the key.
# Multiple change types can be specified using `|` as the delimiter.
filters: |
shared: &shared
- common/**
Expand All @@ -451,7 +449,7 @@ jobs:
# Enable listing of files matching each filter.
# Paths to files will be available in `${FILTER_NAME}_files` output variable.
# Paths will be escaped and space-delimited.
# Output is usable as command line argument list in Linux shell
# Output is usable as command-line argument list in Linux shell
list-files: shell

# In this example changed files will be checked by linter.
Expand All @@ -478,7 +476,7 @@ jobs:
# Paths will be formatted as JSON array
list-files: json

# In this example all changed files are passed to following action to do
# In this example all changed files are passed to the following action to do
# some custom processing.
filters: |
changed:
Expand Down
1 change: 0 additions & 1 deletion action.yml
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Expand Up @@ -13,7 +13,6 @@ inputs:
description: |
Git reference (e.g. branch name) from which the changes will be detected.
This option is ignored if action is triggered by pull_request event.
default: ${{ github.ref }}
required: false
base:
description: |
Expand Down

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