Error in post-job step of CacheV2 task when caching yarn packages

Required Information

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Question, Bug, or Feature?
Type: Bug

Enter Task Name: CacheV2 (https://github.com/microsoft/azure-pipelines-tasks/tree/master/Tasks/CacheV2)

Environment

• Server - Azure Pipelines

  • Account name: markethype
  • Team project name: MarketHype
  • Build ID: 1563
  • URL: https://dev.azure.com/markethype/MarketHype/_build/results?buildId=1563

• Agent - Hosted:

  • Agent Queue name: Azure Pipelines (https://dev.azure.com/markethype/MarketHype/_settings/agentqueues?queueId=17&view=jobs)

Issue Description

Using the CacheV2 task to cache Yarn packages, we’re getting an error in the post-job step of the cache task.

The task is defined exactly as in the docs.

variables:
  YARN_CACHE_FOLDER: $(Pipeline.Workspace)/.yarn

steps:
- task: Cache@2
  inputs:
    key: 'yarn | "$(Agent.OS)" | yarn.lock'
    restoreKeys: |
       yarn | "$(Agent.OS)"
    path: $(YARN_CACHE_FOLDER)
  displayName: Cache Yarn packages

We’re using the vs2017-win2016 image.

Error logs

Starting: Cache Yarn packages
==============================================================================
Task         : Cache
Description  : Cache files between runs
Version      : 2.0.0
Author       : Microsoft Corporation
Help         : https://aka.ms/pipeline-caching-docs
==============================================================================
Resolving key:
 - yarn                         [string]
 - "Windows_NT"                 [string]
 - common/config/rush/yarn.lock [file] --> 0551FA989D7CDCB2101F1397E8E7C5468396D4C72935548B6A74BEB126F0296F
Resolved to: yarn|"Windows_NT"|57F7K6kT3NtH/ZuSuWsxueTn4wCxuYls973WEnqCJgE=
Information, ApplicationInsightsTelemetrySender will correlate events with X-TFS-Session 06101a50-81b0-41b6-ab13-b130ee5c98ae
Information, Getting a pipeline cache artifact with one of the following fingerprints:
Information, Fingerprint: `yarn|"Windows_NT"|57F7K6kT3NtH/ZuSuWsxueTn4wCxuYls973WEnqCJgE=`
Information, There is a cache miss.
tar: D\:\\a\\1\\.yarn: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now
Information, ApplicationInsightsTelemetrySender correlated 1 events with X-TFS-Session 06101a50-81b0-41b6-ab13-b130ee5c98ae
##[error]Process returned non-zero exit code: 2
Finishing: Cache Yarn packages

[jotatoledo]

@jfheins thanks for the hint.

Current configuration works for me in cloud-hosting:

pool:
  vmImage: 'ubuntu-latest'
variables:
 - name: YARN_CONFIG_CACHE
    value: /home/vsts/.cache/yarn/v6
...
- task: Cache@2
  displayName: Cache node modules
  inputs:
    key: 'yarn | "$(Agent.OS)" | yarn.lock'
    restoreKeys: |
      yarn | "$(Agent.OS)"
    path: $(YARN_CONFIG_CACHE)

[bradringel]

Same issue here on a hosted linux agent

2020-06-09T21:30:32.6150811Z ##[section]Starting: Cache yarn packages
2020-06-09T21:30:32.6163777Z ==============================================================================
2020-06-09T21:30:32.6164193Z Task         : Cache
2020-06-09T21:30:32.6164523Z Description  : Cache files between runs
2020-06-09T21:30:32.6164828Z Version      : 2.0.1
2020-06-09T21:30:32.6165145Z Author       : Microsoft Corporation
2020-06-09T21:30:32.6165519Z Help         : https://aka.ms/pipeline-caching-docs
2020-06-09T21:30:32.6165941Z ==============================================================================
2020-06-09T21:30:32.9975064Z Resolving key:
2020-06-09T21:30:33.0154988Z  - yarn      [string]
2020-06-09T21:30:33.0162685Z  - "Linux"   [string]
2020-06-09T21:30:33.0743802Z  - yarn.lock [file] --> EA85735E476B7CE9FF55138A52CE89B7299F92856B621075773F035440C87D93
2020-06-09T21:30:33.0785039Z Resolved to: yarn|"Linux"|QlvZU5gmusF+bBuImFOlW68Qf4aNmdJ1pmhH2LChb5o=
2020-06-09T21:30:33.6622757Z Information, ApplicationInsightsTelemetrySender will correlate events with X-TFS-Session c6edd63d-1238-44dd-a471-3439ac2f402e
2020-06-09T21:30:33.6861181Z Information, Getting a pipeline cache artifact with one of the following fingerprints:
2020-06-09T21:30:33.6862267Z Information, Fingerprint: `yarn|"Linux"|QlvZU5gmusF+bBuImFOlW68Qf4aNmdJ1pmhH2LChb5o=`
2020-06-09T21:30:34.2316763Z Information, There is a cache miss.
2020-06-09T21:30:34.2834153Z tar: /home/vsts/work/1/.yarn: Cannot open: No such file or directory
2020-06-09T21:30:34.2834821Z tar: Error is not recoverable: exiting now
2020-06-09T21:30:34.5635719Z Information, ApplicationInsightsTelemetrySender correlated 1 events with X-TFS-Session c6edd63d-1238-44dd-a471-3439ac2f402e
2020-06-09T21:30:34.5689658Z ##[error]Process returned non-zero exit code: 2
2020-06-09T21:30:34.5844564Z ##[section]Finishing: Cache yarn packages```