Thanks, Haggai Eran! I solved this in 30 minutes thanks to you, not a couple of days. I had the same problem as you: the pipeline I was copying from started with "core/" and the pipeline I was running had a name ending in "/core".

I always specify absolute job/project/pipeline paths as absolute, BUT Jenkins itself gives ${env.JOB_NAME} as a relative path for some reason (maybe backward compatibility?).

env.JOB_NAME.replaceFirst('^(?!/)', '/')

I was running into the same issues, until I dove into the code of the plugin.

If you have a multi branch pipeline job, say project/branch and you add the 

copyArtifactPermission('downstream');

You need to make it

copyArtifactPermission('/downstream');

because the downstream project is not in the "folder" of the project, it's one more level down.

Then passing in `project/branch` as a parameter should work.

The root cause, is that permissions are not checked at run time, if you hardcode the project name, but if you set as a variable, they are checked and names don't match what is expected.

First of all, it seems, that I am running into the same problem. But for me, it looks strange that this error has been reported such a long time ago (and why is it not fixed in these years?), but I am sure that it used to work short time ago. I cannot exactly say, how long it used to work for me, but I had successful builds. I ran into it now that I am moving my jenkins to a new server and re-running all builds. I am wondering why the priority should be minor, it's a blocker, the plugin is no more usable.

My situation:

Jenkins ver. 2.225
Tested Copy Artifact 1.43.1 and 1.43

Global Jenkins environment variable:

• name: MINGW_ARCH
• value: x86_64-w64-mingw32 i686-w64-mingw32

ProjectA:

• matrix build:
  • name: mingw
  • variable: MINGW_ARCH
• Artifacts: */usr and }}{{.zip

ProjectB (built after ProjectA):

• matrix build:
  • name: mingw
  • variable: MINGW_ARCH
• Copy Artifacts:
  • project name: ProjectA/mingw=$mingw
• Artifacts: */usr and }}{{.zip

This results in:

ERROR: Unable to find project for artifact copy: ProjectA/mingw=x86_64-w64-mingw32

Then, if I replace the project name to ProjectA/mingw=x86_64-w64-mingw32, that means hard coded, no variable, then it works.

As you see from the error log, the variable substitution is 100% correct! But still there is somehow a failure with regard to the variable.

The projects configurations (ProjectA is mrw-cxx.win and ProjectB is libxml-cxx.win):

ProjectA:

<?xml version="1.1" encoding="UTF-8" standalone="no"?><matrix-project plugin="matrix-project@1.14">
<actions/>
<description/>
<keepDependencies>false</keepDependencies>
<properties>

</properties>
<scm class="hudson.plugins.git.GitSCM" plugin="git@4.2.2">
<configVersion>2</configVersion>
<userRemoteConfigs>
<hudson.plugins.git.UserRemoteConfig>
<url>https://mrw.dev/libraries/mrw-cxx</url>
</hudson.plugins.git.UserRemoteConfig>
</userRemoteConfigs>
<branches>
<hudson.plugins.git.BranchSpec>
<name>*/master</name>
</hudson.plugins.git.BranchSpec>
</branches>
<doGenerateSubmoduleConfigurations>false</doGenerateSubmoduleConfigurations>
<submoduleCfg class="list"/>
<extensions/>
</scm>
<quietPeriod>5</quietPeriod>
<scmCheckoutRetryCount>10</scmCheckoutRetryCount>
<canRoam>true</canRoam>
<disabled>false</disabled>
<blockBuildWhenDownstreamBuilding>true</blockBuildWhenDownstreamBuilding>
<blockBuildWhenUpstreamBuilding>true</blockBuildWhenUpstreamBuilding>
<triggers>
<hudson.triggers.TimerTrigger>
<spec>@monthly</spec>
</hudson.triggers.TimerTrigger>
<hudson.triggers.SCMTrigger>
<spec>H/5 * * * *</spec>
<ignorePostCommitHooks>false</ignorePostCommitHooks>
</hudson.triggers.SCMTrigger>
</triggers>
<concurrentBuild>false</concurrentBuild>
<axes>
<ca.silvermaplesolutions.jenkins.plugins.daxis.DynamicAxis plugin="dynamic-axis@1.0.3">
<name>mingw</name>
<values>
<string>MINGW_ARCHS</string>
</values>
<varName>MINGW_ARCHS</varName>
<axisValues>
<string>default</string>
</axisValues>
</ca.silvermaplesolutions.jenkins.plugins.daxis.DynamicAxis>
</axes>
<builders>
<hudson.tasks.Shell>
<command>docker pull mwaeckerlin/mingw
docker run --rm -v $(pwd):/workdir -u $(id -u) -e MINGW=$mingw -e BUILD_NUMBER=$BUILD_NUMBER mwaeckerlin/mingw /build.sh -z

FILE=mrw-c++-*_${mingw%-w64-mingw32}.zip
TARGET=~/repository/windows/${mingw%-w64-mingw32}/${JOB_NAME%.win/*}
test -d ${TARGET} || mkdir -p ${TARGET}
cp ${FILE} ${TARGET}/
</command>
</hudson.tasks.Shell>
</builders>
<publishers>
<hudson.tasks.ArtifactArchiver>
<artifacts>usr/**, *.zip</artifacts>
<allowEmptyArchive>false</allowEmptyArchive>
<onlyIfSuccessful>false</onlyIfSuccessful>
<fingerprint>false</fingerprint>
<defaultExcludes>true</defaultExcludes>
<caseSensitive>true</caseSensitive>
</hudson.tasks.ArtifactArchiver>
</publishers>
<buildWrappers>
<hudson.plugins.ws__cleanup.PreBuildCleanup plugin="ws-cleanup@0.38">
<deleteDirs>false</deleteDirs>
<cleanupParameter/>
<externalDelete/>
<disableDeferredWipeout>false</disableDeferredWipeout>
</hudson.plugins.ws__cleanup.PreBuildCleanup>
</buildWrappers>
<executionStrategy class="hudson.matrix.DefaultMatrixExecutionStrategyImpl">
<runSequentially>false</runSequentially>
</executionStrategy>
</matrix-project>

ProjectB:

<?xml version="1.1" encoding="UTF-8" standalone="no"?><matrix-project plugin="matrix-project@1.14">
<actions/>
<description/>
<keepDependencies>false</keepDependencies>
<properties>

</properties>
<scm class="hudson.plugins.git.GitSCM" plugin="git@4.2.2">
<configVersion>2</configVersion>
<userRemoteConfigs>
<hudson.plugins.git.UserRemoteConfig>
<url>https://mrw.dev/libraries/libxml-cxx</url>
</hudson.plugins.git.UserRemoteConfig>
</userRemoteConfigs>
<branches>
<hudson.plugins.git.BranchSpec>
<name>*/master</name>
</hudson.plugins.git.BranchSpec>
</branches>
<doGenerateSubmoduleConfigurations>false</doGenerateSubmoduleConfigurations>
<submoduleCfg class="list"/>
<extensions>
<hudson.plugins.git.extensions.impl.WipeWorkspace/>
</extensions>
</scm>
<quietPeriod>5</quietPeriod>
<scmCheckoutRetryCount>10</scmCheckoutRetryCount>
<canRoam>true</canRoam>
<disabled>false</disabled>
<blockBuildWhenDownstreamBuilding>true</blockBuildWhenDownstreamBuilding>
<blockBuildWhenUpstreamBuilding>true</blockBuildWhenUpstreamBuilding>
<triggers>
<jenkins.triggers.ReverseBuildTrigger>
<spec/>
<upstreamProjects>mrw-cxx.win</upstreamProjects>
<threshold>
<name>SUCCESS</name>
<ordinal>0</ordinal>
<color>BLUE</color>
<completeBuild>true</completeBuild>
</threshold>
</jenkins.triggers.ReverseBuildTrigger>
<hudson.triggers.TimerTrigger>
<spec>@monthly</spec>
</hudson.triggers.TimerTrigger>
<hudson.triggers.SCMTrigger>
<spec>H/5 * * * *</spec>
<ignorePostCommitHooks>false</ignorePostCommitHooks>
</hudson.triggers.SCMTrigger>
</triggers>
<concurrentBuild>false</concurrentBuild>
<axes>
<ca.silvermaplesolutions.jenkins.plugins.daxis.DynamicAxis plugin="dynamic-axis@1.0.3">
<name>mingw</name>
<values>
<string>MINGW_ARCHS</string>
</values>
<varName>MINGW_ARCHS</varName>
<axisValues>
<string>default</string>
</axisValues>
</ca.silvermaplesolutions.jenkins.plugins.daxis.DynamicAxis>
</axes>
<builders>
<hudson.plugins.copyartifact.CopyArtifact plugin="copyartifact@1.43">
<project>mrw-cxx.win/mingw=$mingw</project>
<filter/>
<target/>
<excludes/>
<selector class="hudson.plugins.copyartifact.StatusBuildSelector"/>
<doNotFingerprintArtifacts>false</doNotFingerprintArtifacts>
</hudson.plugins.copyartifact.CopyArtifact>
<hudson.tasks.Shell>
<command>docker pull mwaeckerlin/mingw
docker run --rm -v $(pwd):/workdir -u $(id -u) -e MINGW=$mingw -e BUILD_NUMBER=$BUILD_NUMBER mwaeckerlin/mingw /build.sh -z

FILE=${JOB_NAME%.win/}-_${mingw%-w64-mingw32}.zip
TARGET=~/repository/windows/${mingw%-w64-mingw32}/${JOB_NAME%.win/*}
test -d ${TARGET} || mkdir -p ${TARGET}
cp ${FILE} ${TARGET}/
</command>
</hudson.tasks.Shell>
</builders>
<publishers>
<hudson.tasks.ArtifactArchiver>
<artifacts>usr/**, *.zip</artifacts>
<allowEmptyArchive>false</allowEmptyArchive>
<onlyIfSuccessful>false</onlyIfSuccessful>
<fingerprint>false</fingerprint>
<defaultExcludes>true</defaultExcludes>
<caseSensitive>true</caseSensitive>
</hudson.tasks.ArtifactArchiver>
</publishers>
<buildWrappers>
<hudson.plugins.ws__cleanup.PreBuildCleanup plugin="ws-cleanup@0.38">
<deleteDirs>false</deleteDirs>
<cleanupParameter/>
<externalDelete/>
<disableDeferredWipeout>false</disableDeferredWipeout>
</hudson.plugins.ws__cleanup.PreBuildCleanup>
</buildWrappers>
<executionStrategy class="hudson.matrix.DefaultMatrixExecutionStrategyImpl">
<runSequentially>false</runSequentially>
</executionStrategy>
</matrix-project>

My personal Workaround:

I removed the artifact copy plugin and replaced the copy artifact build step by a freeform shell script as follows, which does the same as this plugin, just set the name of the source project in FROM:

FROM=mrw-cxx.win

STABLE=$(sed -n 's/^lastSuccessfulBuild //p' ~/jobs/${FROM}/builds/permalinks)
SOURCE=~/jobs/${FROM}/configurations/axis-mingw/${mingw}/builds/${STABLE}/archive/usr

cp -a ${SOURCE} .

I have the same issue here.
I think it is also the same like JENKINS-14999, which I believe was never fixed.

Definitely CopyArtifacts behaves differently with a parameterized job name and with a hardcoded job name.
This should not be the case.

IMHO a parameterized job does not use the migration mode and needs an explicit copy artifact permission set although migration mode is turned on an no permission should be needed.