feat: add fetch input (#423)

* chore: add additional log notes

* feat: add `fetch` input

Ref #386

* fix: add warnings about not fetching

* docs: `fetch` input & large repos FAQ

* chore: fix typo

Author: EndBug

Diff for: README.md

@@ -54,6 +54,11 @@ Add a step like this to your workflow:
     # Default: github_actor
     default_author: github_actor
 
+    # Arguments for the git fetch command. If set to false, the action won't fetch the repo.
+    # For more info as to why fetching is usually recommended, please see the "Performance on large repos" FAQ. 
+    # Default: --tags --force
+    fetch: false
+
     # The message for the commit.
     # Default: 'Commit from GitHub Actions (name of the workflow)'
     message: 'Your commit message'
@@ -200,6 +205,14 @@ Some users reported that they were getting an error:
 
 If you're getting this error and you're using `actions/checkout@v1`, try upgrading to `actions/checkout@v2`. If you're still having problems after upgrading, feel free to open an issue. Issue ref: [#146](https://github.com/EndBug/add-and-commit/issues/146)
 
+### Performance on large repos
+
+By default, the action will fetch the repository before starting to work on it: this ensures that it can see the already existing refs.  
+
+When working with a repository that has a lot of branches and tags, fetching it can take a long time. If the fetch step is taking too much time, you can decide to skip it by setting the `fetch` input to `false`: this will prevent the action from running `git fetch` altogether. 
+
+Please note that you have to set up your workflow accordingly: not fetching the repo can impact branch and tag creation within the action, and for this reason it's recommended to disable it only if necessary. Issue ref: [#386](https://github.com/EndBug/add-and-commit/issues/386)
+
 ## Examples
 
 ### Different author/committer configurations

Diff for: action.yml

@@ -29,6 +29,10 @@ inputs:
     description: How the action should fill missing author name or email.
     required: false
     default: 'github_actor'
+  fetch:
+    description: Arguments for the git fetch command (if 'false', the action won't fetch the repo)
+    required: false
+    default: --tags --force
   message:
     description: The message for the commit
     required: false

Diff for: lib/index.js

@@ -10,6 +10,7 @@ interface InputTypes {
   committer_email: string
   cwd: string
   default_author: 'github_actor' | 'user_info' | 'github_actions'
+  fetch: string
   message: string
   new_branch: string | undefined
   pathspec_error_handling: 'ignore' | 'exitImmediately' | 'exitAtEnd'
@@ -124,6 +125,20 @@ export async function checkInputs() {
     )
   // #endregion
 
+  // #region fetch
+  if (getInput('fetch')) {
+    let value: string | boolean
+
+    try {
+      value = getInput('fetch', true)
+    } catch {
+      value = getInput('fetch')
+    }
+
+    core.debug(`Currrent fetch option: '${value}' (parsed as ${typeof value})`)
+  }
+  // #endregion
+
   // #region author_name, author_email
   let name, email
   switch (getInput('default_author')) {

Diff for: src/io.ts

@@ -55,10 +55,29 @@ core.info(`Running in ${baseDir}`)
         JSON.stringify((await git.listConfig()).all, null, 2)
     )
 
-    await git.fetch(['--tags', '--force'], log)
+    let fetchOption: string | boolean
+    try {
+      fetchOption = getInput('fetch', true)
+    } catch {
+      fetchOption = getInput('fetch')
+    }
+    if (fetchOption) {
+      core.info('> Fetching repo...')
+      await git.fetch(
+        matchGitArgs(fetchOption === true ? '' : fetchOption),
+        log
+      )
+    } else core.info('> Not fetching repo.')
 
     const targetBranch = getInput('new_branch')
     if (targetBranch) {
+      core.info('> Checking-out branch...')
+
+      if (!fetchOption)
+        core.warning(
+          'Creating a new branch without fetching the repo first could result in an error when pushing to GitHub. Refer to the action README for more info about this topic.'
+        )
+
       await git
         .checkout(targetBranch)
         .then(() => {
@@ -110,6 +129,12 @@ core.info(`Running in ${baseDir}`)
 
     if (getInput('tag')) {
       core.info('> Tagging commit...')
+
+      if (!fetchOption)
+        core.warning(
+          'Creating a tag without fetching the repo first could result in an error when pushing to GitHub. Refer to the action README for more info about this topic.'
+        )
+
       await git
         .tag(matchGitArgs(getInput('tag') || ''), (err, data?) => {
           if (data) setOutput('tagged', 'true')
@@ -162,6 +187,7 @@ core.info(`Running in ${baseDir}`)
 
       if (getInput('tag')) {
         core.info('> Pushing tags to repo...')
+
         await git
           .pushTags('origin', matchGitArgs(getInput('tag_push') || ''))
           .then((data) => {