consul/.changelog/12329.txt

```release-note:feature
config: automatically reload config when a file changes using the `auto-reload-config` CLI flag or `auto_reload_config` config option.
```
auto-reload configuration when config files change (#12329) * add config watcher to the config package * add logging to watcher * add test and refactor to add WatcherEvent. * add all API calls and fix a bug with recreated files * add tests for watcher * remove the unnecessary use of context * Add debug log and a test for file rename * use inode to detect if the file is recreated/replaced and only listen to create events. * tidy ups (#1535) * tidy ups * Add tests for inode reconcile * fix linux vs windows syscall * fix linux vs windows syscall * fix windows compile error * increase timeout * use ctime ID * remove remove/creation test as it's a use case that fail in linux * fix linux/windows to use Ino/CreationTime * fix the watcher to only overwrite current file id * fix linter error * fix remove/create test * set reconcile loop to 200 Milliseconds * fix watcher to not trigger event on remove, add more tests * on a remove event try to add the file back to the watcher and trigger the handler if success * fix race condition * fix flaky test * fix race conditions * set level to info * fix when file is removed and get an event for it after * fix to trigger handler when we get a remove but re-add fail * fix error message * add tests for directory watch and fixes * detect if a file is a symlink and return an error on Add * rename Watcher to FileWatcher and remove symlink deref * add fsnotify@v1.5.1 * fix go mod * do not reset timer on errors, rename OS specific files * rename New func * events trigger on write and rename * add missing test * fix flaking tests * fix flaky test * check reconcile when removed * delete invalid file * fix test to create files with different mod time. * back date file instead of sleeping * add watching file in agent command. * fix watcher call to use new API * add configuration and stop watcher when server stop * add certs as watched files * move FileWatcher to the agent start instead of the command code * stop watcher before replacing it * save watched files in agent * add add and remove interfaces to the file watcher * fix remove to not return an error * use `Add` and `Remove` to update certs files * fix tests * close events channel on the file watcher even when the context is done * extract `NotAutoReloadableRuntimeConfig` is a separate struct * fix linter errors * add Ca configs and outgoing verify to the not auto reloadable config * add some logs and fix to use background context * add tests to auto-config reload * remove stale test * add tests to changes to config files * add check to see if old cert files still trigger updates * rename `NotAutoReloadableRuntimeConfig` to `StaticRuntimeConfig` * fix to re add both key and cert file. Add test to cover this case. * review suggestion Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com> * add check to static runtime config changes * fix test * add changelog file * fix review comments * Apply suggestions from code review Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com> * update flag description Co-authored-by: FFMMM <FFMMM@users.noreply.github.com> * fix compilation error * add static runtime config support * fix test * fix review comments * fix log test * Update .changelog/12329.txt Co-authored-by: Dan Upton <daniel@floppy.co> * transfer tests to runtime_test.go * fix filewatcher Replace to not deadlock. * avoid having lingering locks Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com> * split ReloadConfig func * fix warning message Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com> * convert `FileWatcher` into an interface * fix compilation errors * fix tests * extract func for adding and removing files Co-authored-by: Ashwin Venkatesh <ashwin@hashicorp.com> Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com> Co-authored-by: FFMMM <FFMMM@users.noreply.github.com> Co-authored-by: Daniel Upton <daniel@floppy.co> 2022-03-31 15:11:49 -04:00			```release-note:feature
			config: automatically reload config when a file changes using the `auto-reload-config` CLI flag or `auto_reload_config` config option.
			```