'reportgenerator' is not recognized as an internal or external command, operable program or batch file

Question

When trying to create a report using 'ReportGenerator' tool as part of Azure devops YAML pipleine, below error is being thrown though i installed the tool in previous step.

- script: dotnet tool install --global dotnet-reportgenerator-globaltool --version 4.6.1
  displayName: 'Install ReportGenerator tool'
  continueOnError: true

- script: reportgenerator "-reports:$(Agent.TempDirectory)/**/*.cobertura.xml" "-targetdir:$(Build.SourcesDirectory)/coverlet/reports" -reporttypes:Cobertura;htmlInline
  displayName: Generate code coverage report
  continueOnError: true

Error : 'reportgenerator' is not recognized as an internal or external command,
operable program or batch file.
##[error]Cmd.exe exited with code '1'.

Adding logs
Install Step:
Script contents:
dotnet tool install dotnet-reportgenerator-globaltool --tool-path tools --version 4.6.1
========================== Starting Command Output ===========================
"C:\windows\system32\cmd.exe" /D /E:ON /V:OFF /S /C "CALL "E:\Agent_work\_temp\d9535a65-152b-4822-a4f2-7e58c11f2418.cmd""
You can invoke the tool using the following command: reportgenerator
Tool 'dotnet-reportgenerator-globaltool' (version '4.6.1') was successfully installed.
Finishing: Install ReportGenerator tool

Executing tool :
Script contents:
reportgenerator "-reports:E:\Agent_work\_temp/**/*.cobertura.xml" "-targetdir:E:\Agent_work\79\s/coverlet/reports" -reporttypes:Cobertura;htmlInline
========================== Starting Command Output ===========================
"C:\windows\system32\cmd.exe" /D /E:ON /V:OFF /S /C "CALL "E:\Agent_work\_temp\53dbc699-e878-4458-aaf2-8e69e5c4f09a.cmd""
'reportgenerator' is not recognized as an internal or external command,
operable program or batch file.
##[error]Cmd.exe exited with code '1'.

Answer 1

There is a known bug when you are trying to do that on Linux machine. After report generator installation, please try to add this additional step to update the PATH:

- script: echo "##vso[task.prependpath]$HOME/.dotnet/tools"

So the whole solution looks like this:

- task: DotNetCoreCLI@2
    displayName: Install ReportGenerator Global Tool
    inputs:
      command: custom
      custom: tool
      arguments: install dotnet-reportgenerator-globaltool -g

- script: echo "##vso[task.prependpath]$HOME/.dotnet/tools"
  displayName: 'Update PATH'

- script: reportgenerator "-reports:$(Agent.TempDirectory)/**/*.cobertura.xml" "-targetdir:$(Build.SourcesDirectory)/coverlet/reports" -reporttypes:Cobertura;htmlInline
  displayName: Generate code coverage report
  continueOnError: true

Answer 2

The following YAML file should do the job:

- script: dotnet tool install --tool-path tools dotnet-reportgenerator-globaltool --version 4.6.1
  displayName: 'Install ReportGenerator tool'
  continueOnError: true

- script: ./tools/reportgenerator "-reports:$(Agent.TempDirectory)/**/*.cobertura.xml" "-targetdir:$(Build.SourcesDirectory)/coverlet/reports" "-reporttypes:Cobertura;HtmlInline"

You can also use the Azure DevOps extension:
https://marketplace.visualstudio.com/items?itemName=Palmmedia.reportgenerator

Usage:

- task: Palmmedia.reportgenerator.reportgenerator-build-release-task.reportgenerator@4
  displayName: ReportGenerator
  inputs:
    reports: '$(Agent.TempDirectory)/**/*.cobertura.xml'
    targetdir: '$(Build.SourcesDirectory)/coverlet/reports'
    reporttypes: 'Cobertura;HtmlInline'