[BUG]: FileTransform@2 fails for empty object JSON files

[JamesInDenver]

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Task name

FileTransform

Task version

2

Issue Description

An empty object ({}) in a JSON file causes FileTransform@2 task to fail.

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

No response

Operation system

Windows Server 2019, 2022 & Ubuntu 20.04

Relevant log output

##[error]Error: ShortFileBufferError /home/vsts/work/1/a/publish/appsettings.json

Full task logs with system.debug enabled

2024-10-22T17:11:18.1353758Z ##[debug]Evaluating condition for step: 'Transform settings files'
2024-10-22T17:11:18.1354874Z ##[debug]Evaluating: SucceededNode()
2024-10-22T17:11:18.1355293Z ##[debug]Evaluating SucceededNode:
2024-10-22T17:11:18.1356014Z ##[debug]=> True
2024-10-22T17:11:18.1356420Z ##[debug]Result: True
2024-10-22T17:11:18.1356816Z ##[section]Starting: Transform settings files
2024-10-22T17:11:18.1363266Z ==============================================================================
2024-10-22T17:11:18.1363464Z Task : File transform
2024-10-22T17:11:18.1363610Z Description : Replace tokens with variable values in XML or JSON configuration files
2024-10-22T17:11:18.1364013Z Version : 2.246.1
2024-10-22T17:11:18.1364147Z Author : Microsoft Corporation
2024-10-22T17:11:18.1364300Z Help : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/file-transform
2024-10-22T17:11:18.1364498Z ==============================================================================
2024-10-22T17:11:18.2320757Z ##[debug]Using node path: /home/vsts/agents/3.245.0/externals/node20_1/bin/node
2024-10-22T17:11:18.3207495Z ##[debug]agent.TempDirectory=/home/vsts/work/_temp
2024-10-22T17:11:18.3221925Z ##[debug]loading inputs and endpoints
2024-10-22T17:11:18.3230369Z ##[debug]loading INPUT_FOLDERPATH
2024-10-22T17:11:18.3252539Z ##[debug]loading INPUT_JSONTARGETFILES
2024-10-22T17:11:18.3257624Z ##[debug]loading ENDPOINT_AUTH_SYSTEMVSSCONNECTION
2024-10-22T17:11:18.3262165Z ##[debug]loading ENDPOINT_AUTH_SCHEME_SYSTEMVSSCONNECTION
2024-10-22T17:11:18.3266394Z ##[debug]loading ENDPOINT_AUTH_PARAMETER_SYSTEMVSSCONNECTION_ACCESSTOKEN
2024-10-22T17:11:18.3278375Z ##[debug]loading SECRET_PAT5
2024-10-22T17:11:18.3283039Z ##[debug]loading SECRET_ENV_PASSWORD_TEST
2024-10-22T17:11:18.3288666Z ##[debug]loading SECRET_ENV_FEEDTOKEN_NUGET_QA_TEMP
2024-10-22T17:11:18.3293141Z ##[debug]loading SECRET_PAT3BASE64READWRITE
2024-10-22T17:11:18.3298820Z ##[debug]loading SECRET_ENV_PASSWORD_QA
2024-10-22T17:11:18.3304478Z ##[debug]loading SECRET_ENV_PASSWORD_PROD
2024-10-22T17:11:18.3310573Z ##[debug]loading SECRET_ENV_FEEDTOKEN_QA_PACKAGES
2024-10-22T17:11:18.3315356Z ##[debug]loading SECRET_PAT
2024-10-22T17:11:18.3320403Z ##[debug]loading SECRET_ENV_FEEDTOKEN_PROD_PACKAGES
2024-10-22T17:11:18.3324521Z ##[debug]loading SECRET_JWT_AUDIENCE
2024-10-22T17:11:18.3329352Z ##[debug]loading SECRET_JWT_SYMMETRICKEY
2024-10-22T17:11:18.3334317Z ##[debug]loading SECRET_ENV_FEEDTOKEN_NUGET_PROD_TEMP
2024-10-22T17:11:18.3356022Z ##[debug]loading SECRET_PAT8BASE64READWRITE
2024-10-22T17:11:18.3357143Z ##[debug]loading SECRET_PAT2
2024-10-22T17:11:18.3358094Z ##[debug]loading SECRET_PAT7
2024-10-22T17:11:18.3359399Z ##[debug]loading SECRET_CORESECURITYOPTIONS_HEALTHCHECKSETTINGS_APIKEY
2024-10-22T17:11:18.3360115Z ##[debug]loading SECRET_PAT4TEST
2024-10-22T17:11:18.3360734Z ##[debug]loading SECRET_SYSTEM_ACCESSTOKEN
2024-10-22T17:11:18.3361376Z ##[debug]loaded 23
2024-10-22T17:11:18.3361951Z ##[debug]Agent.ProxyUrl=undefined
2024-10-22T17:11:18.3362543Z ##[debug]Agent.CAInfo=undefined
2024-10-22T17:11:18.3363139Z ##[debug]Agent.ClientCert=undefined
2024-10-22T17:11:18.3363757Z ##[debug]Agent.SkipCertValidation=undefined
2024-10-22T17:11:18.4394837Z ##[debug]check path : /home/vsts/work/_tasks/FileTransform_8ce97e91-56cc-4743-bfab-9a9315be5f27/2.246.1/task.json
2024-10-22T17:11:18.4396191Z ##[debug]adding resource file: /home/vsts/work/_tasks/FileTransform_8ce97e91-56cc-4743-bfab-9a9315be5f27/2.246.1/task.json
2024-10-22T17:11:18.4397029Z ##[debug]system.culture=en-US
2024-10-22T17:11:18.4407153Z ##[debug]check path : /home/vsts/work/_tasks/FileTransform_8ce97e91-56cc-4743-bfab-9a9315be5f27/2.246.1/node_modules/azure-pipelines-tasks-webdeployment-common/module.json
2024-10-22T17:11:18.4408326Z ##[debug]adding resource file: /home/vsts/work/_tasks/FileTransform_8ce97e91-56cc-4743-bfab-9a9315be5f27/2.246.1/node_modules/azure-pipelines-tasks-webdeployment-common/module.json
2024-10-22T17:11:18.4409230Z ##[debug]system.culture=en-US
2024-10-22T17:11:18.4422697Z ##[debug]folderPath=/home/vsts/work/1/a/publish
2024-10-22T17:11:18.4424110Z ##[debug]Finding files matching input: /home/vsts/work/1/a/publish
2024-10-22T17:11:18.4425283Z ##[debug]xmlTransformationRules=undefined
2024-10-22T17:11:18.4426018Z ##[debug]xmlTargetFiles=undefined
2024-10-22T17:11:18.4427036Z ##[debug]jsonTargetFiles=/.json
2024-10-22T17:11:18.4433879Z ##[debug]pat5=
2024-10-22T17:11:18.4434828Z ##[debug]Env_Password_Test=***
2024-10-22T17:11:18.4436091Z ##[debug]Env_FeedToken_NuGet_QA_Temp=***
2024-10-22T17:11:18.4437067Z ##[debug]pat3base64readwrite=***
2024-10-22T17:11:18.4438040Z ##[debug]Env_Password_QA=***
2024-10-22T17:11:18.4438760Z ##[debug]Env_Password_PROD=***
2024-10-22T17:11:18.4441742Z ##[debug]Env_FeedToken_QA_Packages=***
2024-10-22T17:11:18.4442762Z ##[debug]pat=***
2024-10-22T17:11:18.4443740Z ##[debug]Env_FeedToken_Prod_Packages=***
2024-10-22T17:11:18.4445401Z ##[debug]Jwt.Audience=***
2024-10-22T17:11:18.4447276Z ##[debug]Jwt.SymmetricKey=***
2024-10-22T17:11:18.4448576Z ##[debug]Env_FeedToken_NuGet_PROD_Temp=***
2024-10-22T17:11:18.4449306Z ##[debug]pat8base64readwrite=***
2024-10-22T17:11:18.4450289Z ##[debug]pat2=***
2024-10-22T17:11:18.4451212Z ##[debug]pat7=***
2024-10-22T17:11:18.4451878Z ##[debug]CoreSecurityOptions.HealthCheckSettings.ApiKey=***
2024-10-22T17:11:18.4453305Z ##[debug]pat4test=***
2024-10-22T17:11:18.4455749Z ##[debug]system.accessToken=***
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2024-10-22T17:11:18.4463459Z ##[debug]build.repository.uri=https://@dev.azure.com//_git/***
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2024-10-22T17:11:18.4471148Z ##[debug]task.displayname=Transform settings files
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2024-10-22T17:11:18.4489942Z ##[debug]system.taskInstanceName=FileTransform
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2024-10-22T17:11:18.4645080Z ##[debug]build.buildUri=vstfs:///Build/Build/82865
2024-10-22T17:11:18.4645901Z ##[debug]agent.id=27
2024-10-22T17:11:18.4646634Z ##[debug]system.workfolder=/home/vsts/work
2024-10-22T17:11:18.4647485Z ##[debug]agent.LogToBlobstorageService=true
2024-10-22T17:11:18.4648418Z ##[debug]build.requestedForId=***
2024-10-22T17:11:18.4649166Z ##[debug]build.sourceBranchName=***
2024-10-22T17:11:18.4650022Z ##[debug]system.definitionId=***
2024-10-22T17:11:18.4651547Z ##[debug]ROSETTA2_WARNING=true
2024-10-22T17:11:18.4680642Z ##[debug]agent.machinename=fv-az430-377
2024-10-22T17:11:18.4681491Z ##[debug]system.servertype=Hosted
2024-10-22T17:11:18.4682315Z ##[debug]system.teamFoundationCollectionUri=https://dev.azure.com/***/
2024-10-22T17:11:18.4683223Z ##[debug]DistributedTask.Agent.UseMsalLibrary=True
2024-10-22T17:11:18.4693357Z ##[debug]build.stagingdirectory=/home/vsts/work/1/a
2024-10-22T17:11:18.4694268Z ##[debug]DistributedTask.Agent.LogTaskNameInUserAgent=True
2024-10-22T17:11:18.4695216Z ##[debug]DistributedTask.Agent.AgentEnablePipelineArtifactLargeChunkSize=True
2024-10-22T17:11:18.4696186Z ##[debug]FAIL_JOB_WHEN_AGENT_DIES=true
2024-10-22T17:11:18.4698780Z ##[debug]Environment.Id=3
2024-10-22T17:11:18.4699532Z ##[debug]USE_MSDEPLOY_TOKEN_AUTH=true
2024-10-22T17:11:18.4700359Z ##[debug]AZP_AGENT_MOUNT_WORKSPACE=true
2024-10-22T17:11:18.4701146Z ##[debug]system.taskDefinitionsUri=https://dev.azure.com/***/
2024-10-22T17:11:18.4702059Z ##[debug]system.defaultworkingdirectory=/home/vsts/work/1/s
2024-10-22T17:11:18.4702781Z ##[debug]AZP_AGENT_IGNORE_VSTSTASKLIB=true
2024-10-22T17:11:18.4703525Z ##[debug]agent.diagnostic=True
2024-10-22T17:11:18.4704533Z ##[debug]DistributedTask.Agent.AddForceCredentialsToGitCheckout=True
2024-10-22T17:11:18.4705421Z ##[debug]system.TeamFoundationServerUri=https://dev.azure.com/***/
2024-10-22T17:11:18.4706217Z ##[debug]RETIRE_AZURERM_POWERSHELL_MODULE=true
2024-10-22T17:11:18.4707112Z ##[debug]build.sourceVersionAuthor=***
2024-10-22T17:11:18.4707922Z ##[debug]system.artifactsdirectory=/home/vsts/work/1/a
2024-10-22T17:11:18.4708741Z ##[debug]system.isScheduled=False
2024-10-22T17:11:18.4716000Z ##[debug]agent.cloudid=***
2024-10-22T17:11:18.4716853Z ##[debug]build.sourcesdirectory=/home/vsts/work/1/s
2024-10-22T17:11:18.4718690Z ##[debug]system.collectionId=***
2024-10-22T17:11:18.4719507Z ##[debug]build.definitionVersion=2
2024-10-22T17:11:18.4720354Z ##[debug]build.repository.provider=TfsGit
2024-10-22T17:11:18.4721113Z ##[debug]FAIL_DEPRECATED_BUILD_TASK=true
2024-10-22T17:11:18.4721638Z Applying JSON variable substitution for /*.json
2024-10-22T17:11:18.4722419Z ##[debug]Finding files matching input: /home/vsts/work/1/a/publish//.json
2024-10-22T17:11:18.4723250Z ##[debug]Matching glob pattern: /home/vsts/work/1/a/publish/**/.json
2024-10-22T17:11:18.4724021Z ##[debug]Index of first wildcard: 28
2024-10-22T17:11:18.4724867Z ##[debug]find root dir: /home/vsts/work/1/a/publish/
2024-10-22T17:11:18.4725638Z ##[debug]findPath: '/home/vsts/work/1/a/publish/'
2024-10-22T17:11:18.4726381Z ##[debug]findOptions.allowBrokenSymbolicLinks: 'false'
2024-10-22T17:11:18.4727235Z ##[debug]findOptions.followSpecifiedSymbolicLink: 'true'
2024-10-22T17:11:18.4728009Z ##[debug]findOptions.followSymbolicLinks: 'true'
2024-10-22T17:11:18.4728820Z ##[debug]findOptions.skipMissingFiles: 'false'
2024-10-22T17:11:18.4729648Z ##[debug] /home/vsts/work/1/a/publish/ (directory)

---

2024-10-22T17:11:18.5089616Z ##[debug] /home/vsts/work/1/a/publish/appsettings.Development.json (file)
2024-10-22T17:11:18.5090323Z ##[debug] /home/vsts/work/1/a/publish/appsettings.json (file)
2024-10-22T17:11:18.5090974Z ##[debug] /home/vsts/work/1/a/publish/coresettings.json (file)
2024-10-22T17:11:18.5093411Z ##[debug] /home/vsts/work/1/a/publish/permissionssettings.json (file)
2024-10-22T17:11:18.5113739Z ##[debug] /home/vsts/work/1/a/publish/serilogsettings.json (file)
2024-10-22T17:11:18.5114402Z ##[debug] /home/vsts/work/1/a/publish/web.config (file)
2024-10-22T17:11:18.5115006Z ##[debug]130 results
2024-10-22T17:11:18.5115572Z ##[debug]patternRoot: ''
2024-10-22T17:11:18.5116151Z ##[debug]matchOptions.debug: 'undefined'
2024-10-22T17:11:18.5116754Z ##[debug]matchOptions.nobrace: 'undefined'
2024-10-22T17:11:18.5117373Z ##[debug]matchOptions.noglobstar: 'undefined'
2024-10-22T17:11:18.5117980Z ##[debug]matchOptions.dot: 'undefined'
2024-10-22T17:11:18.5118592Z ##[debug]matchOptions.noext: 'undefined'
2024-10-22T17:11:18.5119199Z ##[debug]matchOptions.nocase: 'false'
2024-10-22T17:11:18.5119801Z ##[debug]matchOptions.nonull: 'undefined'
2024-10-22T17:11:18.5120403Z ##[debug]matchOptions.matchBase: 'true'
2024-10-22T17:11:18.5121002Z ##[debug]matchOptions.nocomment: 'undefined'
2024-10-22T17:11:18.5121631Z ##[debug]matchOptions.nonegate: 'undefined'
2024-10-22T17:11:18.5122260Z ##[debug]matchOptions.flipNegate: 'undefined'
2024-10-22T17:11:18.5122896Z ##[debug]pattern: '/home/vsts/work/1/a/publish//.json'
2024-10-22T17:11:18.5123497Z ##[debug]expanding braces
2024-10-22T17:11:18.5124107Z ##[debug]applying include pattern against original list
2024-10-22T17:11:18.5124702Z ##[debug]8 matches
2024-10-22T17:11:18.5125255Z ##[debug]8 final results
2024-10-22T17:11:18.5125834Z ##[debug]Detecting file encoding using BOM
2024-10-22T17:11:18.5126461Z ##[debug]Unable to detect File encoding using BOM
2024-10-22T17:11:18.5127098Z ##[debug]Detecting file encoding without BOM
2024-10-22T17:11:18.5127764Z Applying JSON variable substitution for /home/vsts/work/1/a/publish/.deps.json
2024-10-22T17:11:18.5128370Z ##[debug]Detecting file encoding using BOM
2024-10-22T17:11:18.5128980Z ##[debug]Unable to detect File encoding using BOM
2024-10-22T17:11:18.5129609Z ##[debug]Detecting file encoding without BOM
2024-10-22T17:11:18.5130132Z Applying JSON variable substitution for /home/vsts/work/1/a/publish/***.runtimeconfig.json
2024-10-22T17:11:18.5130770Z ##[debug]Detecting file encoding using BOM
2024-10-22T17:11:18.5131384Z ##[debug]Unable to detect File encoding using BOM
2024-10-22T17:11:18.5132021Z ##[debug]Detecting file encoding without BOM
2024-10-22T17:11:18.5132528Z Applying JSON variable substitution for /home/vsts/work/1/a/publish/appsettings.Development.json
2024-10-22T17:11:18.5170301Z ##[warning]Can't find loc string for key: ShortFileBufferError
2024-10-22T17:11:18.5179009Z ##[debug]Processed: ##vso[task.issue type=warning;source=TaskInternal;correlationId=61faa3aa-2791-41ab-9815-5d6649d35b32;]Can't find loc string for key: ShortFileBufferError
2024-10-22T17:11:18.5180223Z ##[debug]task result: Failed
2024-10-22T17:11:18.5181454Z ##[error]Error: ShortFileBufferError /home/vsts/work/1/a/publish/appsettings.json
2024-10-22T17:11:18.5182219Z ##[debug]Processed: ##vso[task.issue type=error;source=TaskInternal;correlationId=61faa3aa-2791-41ab-9815-5d6649d35b32;]Error: ShortFileBufferError /home/vsts/work/1/a/publish/appsettings.json
2024-10-22T17:11:18.5184341Z ##[debug]Processed: ##vso[task.complete result=Failed;]Error: ShortFileBufferError /home/vsts/work/1/a/publish/appsettings.json
2024-10-22T17:11:18.5186653Z ##[section]Finishing: Transform settings files

Repro steps

• task: FileTransform@2
  displayName: "Transform settings files"
  inputs:
  folderPath: "$(Build.ArtifactStagingDirectory)/publish"
  jsonTargetFiles: '**/*.json'
  xmlTransformationRules: ''
  xmlTargetFiles: ''