We have a windows slave with a linux master and when uploading to S3, we get "uploading file file:/c:/<path_to_zip>/whatever.zip to s3://artifacts/<repo_path_to_zip>/whatever.zip". It almost looks like it's trying to run from the master because of the "/" before the "c:/" in the file path. I'm not sure about that though so I've included the log below and my pipeline script. The file IS there and I was able to verify it is in the exact place it's looking on my windows slave, so I'm not (entirely) stupid.

[Pipeline] s3Upload
Uploading file file:/c:/jenkins/workspace/<zip_file>.zip to s3://ln-artifacts/<zip_file>.zip
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
com.amazonaws.SdkClientException: Unable to calculate MD5 hash: /c:/jenkins/workspace/<zip_file>.zip (No such file or directory)
at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1587)
at de.taimos.pipeline.aws.S3UploadStep$Execution$1.run(S3UploadStep.java:121)
Caused by: java.io.FileNotFoundException: /c:/jenkins/workspace/<zip_file>.zip (No such file or directory)
at java.io.FileInputStream.open0(Native Method)
at java.io.FileInputStream.open(FileInputStream.java:195)
at java.io.FileInputStream.<init>(FileInputStream.java:138)
at com.amazonaws.util.Md5Utils.computeMD5Hash(Md5Utils.java:97)
at com.amazonaws.util.Md5Utils.md5AsBase64(Md5Utils.java:104)
at com.amazonaws.services.s3.AmazonS3Client.putObject(AmazonS3Client.java:1583)
... 1 more
Finished: FAILURE

pipeline {
agent any
options

{ skipDefaultCheckout() }

parameters

{ string (name : 'buildName') string (name : 'buildNumber') string (name : 'targetRepo') string (name : 'sourceRepo') string (name : 'sourcePath') booleanParam (name : 'publishToS3) }

stages {
stage('Promote') {
steps {
script

{ def server = Artifactory.server('artifactory') def promotionConfig = [ 'buildName' : buildName , 'buildNumber' : buildNumber , 'targetRepo' : targetRepo , 'copy' : true ] server.promote promotionConfig }

}
}
stage('S3 Publish') {
when {
expression

{ return params.publishToS3 }

}
steps {
script {
def server = Artifactory.server('artifactory')
def downloadSpec = """{
"files": [

{ "pattern": "$sourceRepo/$sourcePath", "target": "$sourceRepo/" }

]
}"""
server.download(downloadSpec)
}
s3Upload(file : "$sourceRepo/$sourcePath", bucket : 'artifacts', path : "$sourceRepo/$sourcePath")

}
}
}
}