This script will read the parameters from environment variables if used inside a build task or use the supplied parameters if used outside a build task. The variable $sourcebranch will be set to be used in a later build task.
[CmdletBinding()]
param (
[Parameter(Mandatory=$false)][string]$projectUri = "$env:SYSTEM_TEAMFOUNDATIONCOLLECTIONURI",
[Parameter(Mandatory=$false)][string]$branch = "$env:BUILD_branch",
[Parameter(Mandatory=$false)][string]$repositoryName = "$env:BUILD_REPOSITORY_NAME",
[Parameter(Mandatory=$false)][string]$projectName = "$env:SYSTEM_TEAMPROJECT",
[Parameter(Mandatory=$false)][string]$oAuthToken = "$env:SYSTEM_ACCESSTOKEN",
[Parameter(Mandatory=$false)][string]$username,
[Parameter(Mandatory=$false)][string]$password
)
#check all parameters
if(!$oAuthToken) {
if(!$username -or !$password) {
throw "You must either supply an OAuth Token or a username and a password. You can supply the token via the environment variable SYSTEM_ACCESSTOKEN"
}
$basicAuth= ("{0}:{1}"-f $username,$password)
$basicAuth=[System.Text.Encoding]::UTF8.GetBytes($basicAuth)
$basicAuth=[System.Convert]::ToBase64String($basicAuth)
$headers= @{Authorization=("Basic {0}"-f $basicAuth)}
}
else {
$headers= @{Authorization="Bearer $oAuthToken"}
}
if(!$projectUri) {
throw "You must supply a project uri or set the Environment variable SYSTEM_TEAMFOUNDATIONCOLLECTIONURI"
}
if(!$branch) {
throw "You must supply a branch or set the Environment variable BUILD_branch"
}
if(!$repositoryName) {
throw "You must supply a repository name or set the Environment variable BUILD_REPOSITORY_NAME"
}
if(!$projectName) {
throw "You must supply a project name or set the Environment variable SYSTEM_TEAMPROJECT"
}
#get pull request ID via regex
$pullrequest = "refs/pull/+(?<pullnumber>\w+?)/merge+"
if($branch -match $pullrequest) {
$pullrequestid = $Matches.pullnumber;
Write-Output "Pull request ID is $pullrequestid"
}
else {
Write-Output "Cannot find pull request ID"
}
#get pull request information via API
$url= $projectUri + "DefaultCollection/$projectName/_apis/git/repositories/$repositoryName/pullRequests/$pullrequestid\?api-version=1.0-preview.1"
Write-Output "Getting info from $url"
$getpullrequest = Invoke-RestMethod -Uri $url -headers $headers -Method Get
#get sourcebranch and targetbranch ref
$sourceref = $getpullrequest.sourceRefName
$targetref = $getpullrequest.targetRefName
#get the branch name via regex
$branchref = "refs/heads/(?<realBranchname>.*)"
if($sourceref -match $branchref) {
$sourcebranch = $Matches.realBranchname;
Write-Output "Real source branch is $sourcebranch"
}
else {
Write-Output "Cannot find real source branch"
}
if($targetref -match $branchref) {
$targetbranch = $Matches.realBranchname;
Write-Output "Real target branch is $targetbranch"
}
else {
Write-Output "Cannot find real target branch"
}
#set a variable "sourcebranch" to use it in another build task
Write-Output "##vso[task.setvariable variable=sourcebranch;]$sourcebranch"
