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Build tool for automatically sending feature flag code references to LaunchDarkly
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Co-Authored-By: atrakh <arnoldtrakh@gmail.com>
Latest commit f68e960 Apr 11, 2019

README.md

ld-find-code-refs

Command line program for generating flag code references.

This repository provides solutions for configuring LaunchDarkly code references with various systems out-of-the-box, as well as the ability to automate code reference discovery on your own infrastructure using the provided command line interface.

Documentation quick links

Configuration options

We provide turnkey support for common trigger mechanisms and CI / CD providers. You can also invoke the ld-find-code-refs utility from the command line, which can be run in any custom workflow you define (e.g. from a bash script, or a cron job).

System Status
GitHub Actions Supported
CircleCI Orbs Supported
Bitbucket Pipes Supported
Manually via CLI Supported

Execution via CLI

The command line program may be run manually, and executed in an environment of your choosing. The program requires your git repo to be cloned locally, and the currently checked out branch will be scanned for code references.

We recommend ingraining ld-find-code-refs into your CI/CD build process. ld-find-code-refs should run whenever a commit is pushed to your repository.

Prerequisites

ld-find-code-refs has two dependencies, which need to be installed in the system path:

Dependency Version Tested
git 2.21.0
ag 2.2.0

All turn-key configuration methods (docker images used by services like CircleCI or Github actions) come with these dependencies preinstalled.

Installing

macOS

brew tap launchdarkly/tap
brew install ld-find-code-refs

You can now run ld-find-code-refs.

Linux

We do not yet have repositories set up for our linux packages, but we do upload deb and rpm packages with our github releases.

Ubuntu

This shell script can be used to download and install ag and ld-find-code-refs on Ubuntu.

apt-get install silversearcher-ag

wget -qO- https://api.github.com/repos/launchdarkly/ld-find-code-refs/releases/latest \
	| grep "browser_download_url" \
	| grep "amd64.deb" \
	| cut -d'"' -f4 \
	| wget -qi - -O ld-find-code-refs.amd64.deb

dpkg -i ld-find-code-refs.amd64.deb

Windows

A Windows executable of ld-find-code-refs is available on the releases page. The following Chocolatey command may be used to install the required dependency, ag. If you do not have Chocolatey installed, see ag's documentation for installation instructions.

choco install ag

Docker

ld-find-code-refs is available as a docker image. The image provides an entrypoint for ld-find-code-refs, to which command line arguments may be passed. If using the entrypoint, your git repository to be scanned should be mounted as a volume. Otherwise, you may override the entrypoint and access ld-find-code-refs directly from the shell.

docker pull launchdarkly/ld-find-code-refs
docker run \
  -v /Users/arnold/Documents/projects/launchdarkly/support-service:/repo \
  launchdarkly/ld-find-code-refs \
  -dir="/repo"

Manual

Precompiled binaries for the latest release can be found here. Be sure to install the required dependencies before running ld-find-code-refs

Examples

The section provides examples of various bash commands to execute ld-find-code-refs (when installed in the system PATH) with various configurations. We recommend reading through the following examples to gain an understanding of common configurations, as well as the detailed sections below documenting advanced configuration options.

Minimal configuration:

ld-find-code-refs \
  -accessToken=$YOUR_LAUNCHDARKLY_ACCESS_TOKEN \ # example: api-xxxx
  -projKey=$YOUR_LAUNCHDARKLY_PROJECT_KEY \ # example: my-project
  -repoName=$YOUR_REPOSITORY_NAME \ # example: my-repo
  -dir="/path/to/git/repo"

Configuration with context lines provided:

ld-find-code-refs \
  -accessToken="$YOUR_LAUNCHDARKLY_ACCESS_TOKEN" \
  -projKey="$YOUR_LAUNCHDARKLY_PROJECT_KEY" \
  -repoName="$YOUR_REPOSITORY_NAME" \
  -dir="/path/to/git/repo" \
  -contextLines=3 # can be up to 5. If < 0, no source code will be sent to LD

The above configuration, with the vendor/ directory and all css files ignored by the scanner. The exclude parameter may be configuration as any regular expression that matches the files and directories you'd like to ignore for your repository:

ld-find-code-refs \
  -accessToken="$YOUR_LAUNCHDARKLY_ACCESS_TOKEN" \
  -projKey="$YOUR_LAUNCHDARKLY_PROJECT_KEY" \
  -repoName="$YOUR_REPOSITORY_NAME" \
  -dir="/path/to/git/repo" \
  -contextLines=3
  -exclude="vendor/|\.css" # replace with desired regex pattern

A configuration with the the repoType set to GitHub, and the repuUrl set to a GitHub URL. We recommend configuring these parameters so LaunchDarkly is able to generate reference links to your source code:

ld-find-code-refs \
  -accessToken="$YOUR_LAUNCHDARKLY_ACCESS_TOKEN" \
  -projKey="$YOUR_LAUNCHDARKLY_PROJECT_KEY" \
  -repoName="$YOUR_REPOSITORY_NAME" \
  -dir="/path/to/git/repo" \
  -contextLines=3
  -repoType="github"
  -repoUrl="$YOUR_REPOSITORY_URL" # example: https://github.com/launchdarkly/ld-find-code-refs

The above configuration with left and right carets specified as flag key delimiters:

ld-find-code-refs \
  -accessToken="$YOUR_LAUNCHDARKLY_ACCESS_TOKEN" \
  -projKey="$YOUR_LAUNCHDARKLY_PROJECT_KEY" \
  -repoName="$YOUR_REPOSITORY_NAME" \
  -dir="/path/to/git/repo" \
  -contextLines=3
  -repoType="github"
  -repoUrl="$YOUR_REPOSITORY_URL" # example: https://github.com/launchdarkly/ld-find-code-refs
  -D="<"
  -D=">"

Required arguments

A number of command-line arguments are available to the code ref finder, some optional, and some required. Command line arguments may be passed to the program in any order.

Option Description
accessToken LaunchDarkly personal access token with writer-level access, or access to the code-reference-repository custom role resource
dir Path to existing checkout of the git repo. The currently checked out branch will be scanned for code references.
projKey A LaunchDarkly project key.
repoName Git repo name. Will be displayed in LaunchDarkly. Repo names must only contain letters, numbers, '.', '_' or '-'."

Optional arguments

Although these arguments are optional, a (*) indicates a recommended parameter that adds great value if configured.

Option Description Default
baseUri Set the base URL of the LaunchDarkly server for this configuration. Only necessary if using a private instance of LaunchDarkly. https://app.launchdarkly.com
contextLines (*) The number of context lines to send to LaunchDarkly. If < 0, no source code will be sent to LaunchDarkly. If 0, only the line containing flag references will be sent. If > 0, will send that number of context lines above and below the flag reference. A maximum of 5 context lines may be provided. 2
debug Enables verbose debug logging. false
defaultBranch The git default branch. The LaunchDarkly UI will default to display code references for this branch. master
delimiters or D Specifies additional delimiters used to match flag keys. Must be a non-control ASCII character. If more than one character is provided in delimiters, each character will be treated as a separate delimiter. Will only match flag keys with surrounded by any of the specified delimeters. This option may also be specified multiple times for multiple delimiters. By default, only flags delimited by single-quotes, double-quotes, and backticks will be matched. [" ' `]
exclude (*) A regular expression (PCRE) defining the files and directories which the flag finder should exclude. Partial matches are allowed. Examples: vendor/, \.css, vendor/|\.css
updateSequenceId An integer representing the order number of code reference updates. Used to version updates across concurrent executions of the program. If not provided, data will always be updated. If provided, data will only be updated if the existing updateSequenceId is less than the new updateSequenceId. Examples: the time a git push was initiated, CI build number, the current unix timestamp.
repoType (*) The repo service provider. Used to generate repository links in the LaunchDarkly UI. Acceptable values: github|bitbucket|custom custom
repoUrl (*) The display url for the repository. If provided for a github or bitbucket repository, LaunchDarkly will attempt to automatically generate source code links. Example: https://github.com/launchdarkly/ld-find-code-refs
commitUrlTemplate If provided, LaunchDarkly will attempt to generate links to your Git service provider per commit. Example: https://github.com/launchdarkly/ld-find-code-refs/commit/${sha}. Allowed template variables: branchName, sha. If commitUrlTemplate is not provided, but repoUrl is provided and repoType is not custom, LaunchDarkly will automatically generate links to the repository for each commit.
hunkUrlTemplate If provided, LaunchDarkly will attempt to generate links to your Git service provider per code reference. Example: https://github.com/launchdarkly/ld-find-code-refs/blob/${sha}/${filePath}#L${lineNumber}. Allowed template variables: sha, filePath, lineNumber. If hunkUrlTemplate is not provided, but repoUrl is provided and repoType is not custom, LaunchDarkly will automatically generate links to the repository for each code reference.
version If provided, the current ld-find-code-refs version number will be logged, and the scanner will exit with a return code of 0. false

Ignoring files and directories

ld-find-code-refs provides multiple methods for ignoring files and directories:

  1. All dotfiles and patterns in .gitignore, .hgignore, and .ignore will be excluded by default.
  2. Provide a .ldignore file in the root directory of your Git repository. All patterns specified in .ldignore file will be excluded by the scanner. Patterns must follow the .gitignore format as specified here: https://git-scm.com/docs/gitignore#_pattern_format
  3. The exclude command line option (see above section) may be used to specify a single regular expression for the exclude pattern.

If both .ldignore and the exclude argument are provided, ld-find-code-refs will test against both for file exclusion. Do note that .ldignore expects shell glob patterns, while the exclude option expects a PCRE-compliant regular expression.

Branch garbage collection

After scanning has completed, ld-find-code-refs will search for and delete any stale branches. A branch is considered stale if it has references in LaunchDarkly, but no longer exists on the Git remote. As a consequence of this behavior, any code references on local branches or branches belonging only to a remote other than the default one will be removed the next time ld-find-code-refs is run on a different branch.

This operation requires your environment to be authenticated for remote access to your repository. Branch cleanup is not currently supported when running ld-find-code-refs via Github actions or Bitbucket pipelines.

You can’t perform that action at this time.