cache/restore/README.md

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GA for granular cache (#1035) * Add example for Haskell Stack * Revert "Add example for Haskell Stack" * Basic implementation * Updated variable name * Adding wrapper class * Changed logs to warnings * added debug logs * experimenting * Test * test * new try * test * Impl separated * Reverted wrapper changes * Added test cases * Some cleanup * Formatted document * Fixed test cases issues * Slight modification for test cases check * Updated new actions' input descriptions * Reverted custom asks implemented and added wrapper * refactor into a generic outputter * Readme draft for new actions * Generated dist * Fixed breaking test case * Removed return type in promise * Removed commented lines * Calling methods from same file * dist * update save as well * fix merge * Changes for beta release * Update dist folder * Fixed formatting * dist * Add support for gzip fallback for restore of old cache on windows * Fixed test cases * Fixed test cases * Added restore only and save only test cases * Updated new actions dist files * Removed comments * Fixed inputs * Renamed variables and added tests * Fixed breaking test case * Fixed review comments and tests * added stateprovider changes * Deleted stateprovider tests until added * Added stateprovider test cases * Fixed breaking test case * Updated outputs of restore action * Changes for beta release * Update dist folder * Add support for gzip fallback for restore of old cache on windows * update for new beta release * Update save/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Added more assertions as values can't be checked * Removed unused code * Merged beta branch and resolved conflicts * Added save readme * Updates to save readme * Renamed output * Added cache hit info in readme * Update restore/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update save/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update save/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Removed verbose statements * Repositioned new actions introduction * Added test case for restore state * Addressed review comments * nit * nit: added language to code blocks * Updated beta version to 3.2.0-beta.1 * Added stateprovider mock implementations * Linting errors fixed * Save-only warning added * Updated return ID to -2 * Removed -2 error code * Removed comment * Updated cache npm lib version * Updated license version * Updated releases.md * Updated readme with the new actions in what's new Co-authored-by: Malo Bourgon <mbourgon@gmail.com> Co-authored-by: Vipul <vsvipul@github.com> Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> Co-authored-by: Tanuj Kumar Mishra <tanuj077@users.noreply.github.com> Co-authored-by: Sampark Sharma <phantsure@github.com>
2022-12-21 15:08:44 +01:00
# Restore action
The restore action, as the name suggest, restores a cache. It acts similar to the`cache` action except that it doesn't have a post step to save the cache. This action can provide you a granular control to only restore a cache without having to necessarily save it. It accepts the same set of inputs as the `cache` action.
## Inputs
* `path` - A list of files, directories, and wildcard patterns to cache and restore. See [`@actions/glob`](https://github.com/actions/toolkit/tree/main/packages/glob) for supported patterns.
* `key` - String used while saving cache for restoring the cache
* `restore-keys` - An ordered list of prefix-matched keys to use for restoring stale cache if no cache hit occurred for key.
## Outputs
* `cache-hit` - A boolean value to indicate an exact match was found for the key.
* `cache-primary-key` - Cache primary key passed in the input to use in subsequent steps of the workflow.
* `cache-matched-key` - Key of the cache that was restored, it could either be the primary key on cache-hit or a partial/complete match of one of the restore keys.
> **Note**
`cache-hit` will be set to `true` only when cache hit occurs for the exact `key` match. For a partial key match via `restore-keys` or a cache miss, it will be set to `false`.
### Environment Variables
* `SEGMENT_DOWNLOAD_TIMEOUT_MINS` - Segment download timeout (in minutes, default `60`) to abort download of the segment if not completed in the defined number of minutes. [Read more](https://github.com/actions/cache/blob/main/workarounds.md#cache-segment-restore-timeout)
## Use cases
As this is a newly introduced action to give users more control in their workflows, below are some use cases where one can use this action.
### Only restore cache
In case you are using another workflow to create and save your cache that can be reused by other jobs in your repository, this action will take care of your restore only needs.
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/cache/restore@v3
id: cache
with:
path: path/to/dependencies
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
- name: Install Dependencies
if: steps.cache.outputs.cache-hit != 'true'
run: /install.sh
- name: Build
run: /build.sh
- name: Publish package to public
run: /publish.sh
```
Once the cache is restored, this action won't run any post step to do post-processing like `actions/cache` and the rest of the workflow will run as usual.
### Save intermediate private build artifacts
In case of multi-module projects, where the built artifact of one project needs to be reused in subsequent child modules, the need of rebuilding the parent module again and again with every build can be eliminated. The `actions/cache` or `actions/cache/save` action can be used to build and save the parent module artifact once, and restored multiple times while building the child modules.
#### Step 1 - Build the parent module and save it
```yaml
steps:
- uses: actions/checkout@v3
- name: Build
run: /build-parent-module.sh
- uses: actions/cache/save@v3
id: cache
with:
path: path/to/dependencies
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
```
#### Step 2 - Restore the built artifact from cache using the same key and path
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/cache/restore@v3
id: cache
with:
path: path/to/dependencies
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
- name: Install Dependencies
if: steps.cache.outputs.cache-hit != 'true'
run: /install.sh
- name: Build
run: /build-child-module.sh
- name: Publish package to public
run: /publish.sh
```
### Exit workflow on cache miss
You can use the output of this action to exit the workflow on cache miss. This way you can restrict your workflow to only initiate the build when `cache-hit` occurs, in other words, cache with exact key is found.
```yaml
steps:
- uses: actions/checkout@v3
- uses: actions/cache/restore@v3
id: cache
with:
path: path/to/dependencies
key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
- name: Check cache hit
if: steps.cache.outputs.cache-hit != 'true'
run: exit 1
- name: Build
run: /build.sh
```
## Tips
#### Reusing primary key and restored key in the save action
Usually you may want to use same `key` in both `actions/cache/restore` and `actions/cache/save` action. To achieve this, use `outputs` from the restore action to reuse the same primary key (or the key of the cache that was restored).
GA for granular cache (#1035) * Add example for Haskell Stack * Revert "Add example for Haskell Stack" * Basic implementation * Updated variable name * Adding wrapper class * Changed logs to warnings * added debug logs * experimenting * Test * test * new try * test * Impl separated * Reverted wrapper changes * Added test cases * Some cleanup * Formatted document * Fixed test cases issues * Slight modification for test cases check * Updated new actions' input descriptions * Reverted custom asks implemented and added wrapper * refactor into a generic outputter * Readme draft for new actions * Generated dist * Fixed breaking test case * Removed return type in promise * Removed commented lines * Calling methods from same file * dist * update save as well * fix merge * Changes for beta release * Update dist folder * Fixed formatting * dist * Add support for gzip fallback for restore of old cache on windows * Fixed test cases * Fixed test cases * Added restore only and save only test cases * Updated new actions dist files * Removed comments * Fixed inputs * Renamed variables and added tests * Fixed breaking test case * Fixed review comments and tests * added stateprovider changes * Deleted stateprovider tests until added * Added stateprovider test cases * Fixed breaking test case * Updated outputs of restore action * Changes for beta release * Update dist folder * Add support for gzip fallback for restore of old cache on windows * update for new beta release * Update save/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/action.yml Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Added more assertions as values can't be checked * Removed unused code * Merged beta branch and resolved conflicts * Added save readme * Updates to save readme * Renamed output * Added cache hit info in readme * Update restore/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update restore/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update save/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Update save/README.md Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> * Removed verbose statements * Repositioned new actions introduction * Added test case for restore state * Addressed review comments * nit * nit: added language to code blocks * Updated beta version to 3.2.0-beta.1 * Added stateprovider mock implementations * Linting errors fixed * Save-only warning added * Updated return ID to -2 * Removed -2 error code * Removed comment * Updated cache npm lib version * Updated license version * Updated releases.md * Updated readme with the new actions in what's new Co-authored-by: Malo Bourgon <mbourgon@gmail.com> Co-authored-by: Vipul <vsvipul@github.com> Co-authored-by: Bishal Prasad <bishal-pdmsft@github.com> Co-authored-by: Tanuj Kumar Mishra <tanuj077@users.noreply.github.com> Co-authored-by: Sampark Sharma <phantsure@github.com>
2022-12-21 15:08:44 +01:00
#### Using restore action outputs to make save action behave just like the cache action
The outputs `cache-primary-key` and `cache-matched-key` can be used to check if the restored cache is same as the given primary key. Alternatively, the `cache-hit` output can also be used to check if the restored was a complete match or a partially restored cache.
#### Ensuring proper restores and save happen across the actions
It is very important to use the same `key` and `path` that were used by either `actions/cache` or `actions/cache/save` while saving the cache. Learn more about cache key [naming](https://github.com/actions/cache#creating-a-cache-key) and [versioning](https://github.com/actions/cache#cache-version) here.