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Showing content from https://github.com/npm/git below:

npm/git: a util for spawning git from npm CLI contexts

A utility for spawning git from npm CLI contexts.

This is not an implementation of git itself, it's just a thing that spawns child processes to tell the system git CLI implementation to do stuff.

const git = require('@npmcli/git')
git.clone('git://foo/bar.git', 'some-branch', 'some-path', opts) // clone a repo
  .then(() => git.spawn(['checkout', 'some-branch'], {cwd: 'bar'}))
  .then(() => git.spawn(['you get the idea']))

Most methods take an options object. Options are described below.

Launch a git subprocess with the arguments specified.

All the other functions call this one at some point.

Processes are launched using @npmcli/promise-spawn, with the stdioString: true option enabled by default, since git output is generally in readable string format.

Return value is a Promise that resolves to a result object with {cmd, args, code, signal, stdout, stderr} members, or rejects with an error with the same fields, passed back from @npmcli/promise-spawn.

Clone the repository into target path (or the default path for the name of the repository), checking out ref.

Return value is the sha of the current HEAD in the locally cloned repository.

In lieu of a specific ref, you may also pass in a spec option, which is a npm-package-arg object for a git package dependency reference. In this way, you can select SemVer tags within a range, or any git committish value. For example:

const npa = require('npm-package-arg')
git.clone('git@github.com:npm/git.git', '', null, {
  spec: npa('github:npm/git#semver:1.x'),
})

// only gitRange and gitCommittish are relevant, so this works, too
git.clone('git@github.com:npm/git.git', null, null, {
  spec: { gitRange: '1.x' }
})

This will automatically do a shallow --depth=1 clone on any hosts that are known to support it. To force a shallow or deep clone, you can set the gitShallow option to true or false respectively.

Fetch a representation of all of the named references in a given repository. The resulting doc is intentionally somewhat packument-like, so that git semver ranges can be applied using the same npm-pick-manifest logic.

The resulting object looks like:

revs = {
  versions: {
    // all semver-looking tags go in here...
    // version: { sha, ref, rawRef, type }
    '1.0.0': {
      sha: '1bc5fba3353f8e1b56493b266bc459276ab23139',
      ref: 'v1.0.0',
      rawRef: 'refs/tags/v1.0.0',
      type: 'tag',
    },
  },
  'dist-tags': {
    HEAD: '1.0.0',
    latest: '1.0.0',
  },
  refs: {
    // all the advertised refs that can be cloned down remotely
    HEAD: { sha, ref, rawRef, type: 'head' },
    master: { ... },
    'v1.0.0': { ... },
    'refs/tags/v1.0.0': { ... },
  },
  shas: {
    // all named shas referenced above
    // sha: [list, of, refs]
    '6b2501f9183a1753027a9bf89a184b7d3d4602c7': [
      'HEAD',
      'master',
      'refs/heads/master',
    ],
    '1bc5fba3353f8e1b56493b266bc459276ab23139': [ 'v1.0.0', 'refs/tags/v1.0.0' ],
  },
}

Resolve to true if the path argument refers to the root of a git repository.

It does this by looking for a file in ${path}/.git/index, which is not an airtight indicator, but at least avoids being fooled by an empty directory or a file named .git.

Given a path, walk up the file system tree until a git repo working directory is found. Since this calls stat a bunch of times, it's probably best to only call it if you're reasonably sure you're likely to be in a git project somewhere. Pass in opts.root to stop checking at that directory.

Resolves to null if not in a git project.

Return true if in a git dir, and that git dir is free of changes. This will resolve true if the git working dir is clean, or false if not, and reject if the path is not within a git directory or some other error occurs.

• retry An object to configure retry behavior for transient network errors with exponential backoff.
  • retries: Defaults to opts.fetchRetries or 2
  • factor: Defaults to opts.fetchRetryFactor or 10
  • maxTimeout: Defaults to opts.fetchRetryMaxtimeout or 60000
  • minTimeout: Defaults to opts.fetchRetryMintimeout or 1000
• git Path to the git binary to use. Will look up the first git in the PATH if not specified.
• spec The npm-package-arg specifier object for the thing being fetched (if relevant).
• fakePlatform set to a fake value of process.platform to use. (Just for testing win32 behavior on Unix, and vice versa.)
• cwd The current working dir for the git command. Particularly for find and is and isClean, it's good to know that this defaults to process.cwd(), as one might expect.
• Any other options that can be passed to @npmcli/promise-spawn, or child_process.spawn().

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