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domruf
vcs: catch MemoryErrors when calling Git diff

Binary diffs can make the diffs VERY big and cause MemoryError exceptions.

Before giving MemoryError, the system might start swapping, any process might
fail when allocating memory, random processes might get killed, and our process
might fail in other places. The proper fix would be to avoid the problem by not
trying to process more data than we can handle - for example by not processing
more than a certain amount of Git output.

Before, memory errors were shown to the user as a 500 Internal Server Error
page.

Now, as long as we have no better/safer way get the diff, catch the MemoryError
and show the page with a flash error message and no diff.

The error handling is placed in the diffs module to avoid leaking flash
messages into the vcs lib.
def createvirtualenv = ''
def activatevirtualenv = ''

node {
    properties([[$class: 'BuildDiscarderProperty',
                  strategy: [$class: 'LogRotator',
                              artifactDaysToKeepStr: '',
                              artifactNumToKeepStr: '10',
                              daysToKeepStr: '',
                              numToKeepStr: '']]]);
    if (isUnix()) {
        createvirtualenv = 'rm -r $JENKINS_HOME/venv/$JOB_NAME || true && virtualenv $JENKINS_HOME/venv/$JOB_NAME'
        activatevirtualenv = '. $JENKINS_HOME/venv/$JOB_NAME/bin/activate'
    } else {
        createvirtualenv = 'rmdir /s /q %JENKINS_HOME%\\venv\\%JOB_NAME% || true && virtualenv %JENKINS_HOME%\\venv\\%JOB_NAME%'
        activatevirtualenv = 'call %JENKINS_HOME%\\venv\\%JOB_NAME%\\Scripts\\activate.bat'
    }

    stage('checkout') {
        checkout scm
        if (isUnix()) {
            sh 'hg --config extensions.purge= purge --all'
        } else {
            bat 'hg --config extensions.purge= purge --all'
        }
    }
    stage('virtual env') {
        def virtualenvscript = """$createvirtualenv
            $activatevirtualenv
            python -m pip install --upgrade pip
            pip install --upgrade setuptools
            pip install --upgrade pylint
            pip install --upgrade pytest-cov
            """
        if (isUnix()) {
            virtualenvscript += """
                pip install --upgrade python-ldap
                pip install --upgrade python-pam
                """
            sh virtualenvscript
        } else {
            bat virtualenvscript
        }
    }
    stage('setup') {
        def virtualenvscript = """$activatevirtualenv
            pip install --upgrade -e .
            pip install -r dev_requirements.txt
            python setup.py compile_catalog
            """
        if (isUnix()) {
            sh virtualenvscript
        } else {
            bat virtualenvscript
        }
        stash name: 'kallithea', useDefaultExcludes: false
    }
    stage('pylint') {
        sh script: """$activatevirtualenv
            pylint -j 0 --disable=C -f parseable kallithea > pylint.out
            """, returnStatus: true
        archiveArtifacts 'pylint.out'
        try {
            step([$class: 'WarningsPublisher', canComputeNew: false, canResolveRelativePaths: false, defaultEncoding: '', excludePattern: '', healthy: '', includePattern: '', messagesPattern: '', parserConfigurations: [[parserName: 'PyLint', pattern: 'pylint.out']], unHealthy: ''])
        } catch (java.lang.IllegalArgumentException exc) {
            echo "You need to install the 'Warnings Plug-in' to display the pylint report."
            currentBuild.result = 'UNSTABLE'
            echo "Caught: ${exc}"
        }
    }
}

def pytests = [:]
pytests['sqlite'] = {
    node {
        ws {
            deleteDir()
            unstash name: 'kallithea'
            if (isUnix()) {
                sh script: """$activatevirtualenv
                    py.test -p no:sugar --cov-config .coveragerc --junit-xml=pytest_sqlite.xml --cov=kallithea
                    """, returnStatus: true
            } else {
                bat script: """$activatevirtualenv
                    py.test -p no:sugar --cov-config .coveragerc --junit-xml=pytest_sqlite.xml --cov=kallithea
                    """, returnStatus: true
            }
            sh 'sed --in-place "s/\\(classname=[\'\\"]\\)/\\1SQLITE./g" pytest_sqlite.xml'
            archiveArtifacts 'pytest_sqlite.xml'
            junit 'pytest_sqlite.xml'
            writeFile(file: '.coverage.sqlite', text: readFile('.coverage'))
            stash name: 'coverage.sqlite', includes: '.coverage.sqlite'
        }
    }
}

pytests['de'] = {
    node {
        if (isUnix()) {
            ws {
                deleteDir()
                unstash name: 'kallithea'
                withEnv(['LANG=de_DE.UTF-8',
                    'LANGUAGE=de',
                    'LC_ADDRESS=de_DE.UTF-8',
                    'LC_IDENTIFICATION=de_DE.UTF-8',
                    'LC_MEASUREMENT=de_DE.UTF-8',
                    'LC_MONETARY=de_DE.UTF-8',
                    'LC_NAME=de_DE.UTF-8',
                    'LC_NUMERIC=de_DE.UTF-8',
                    'LC_PAPER=de_DE.UTF-8',
                    'LC_TELEPHONE=de_DE.UTF-8',
                    'LC_TIME=de_DE.UTF-8',
                ]) {
                    sh script: """$activatevirtualenv
                        py.test -p no:sugar --cov-config .coveragerc --junit-xml=pytest_de.xml --cov=kallithea
                        """, returnStatus: true
                }
                sh 'sed --in-place "s/\\(classname=[\'\\"]\\)/\\1DE./g" pytest_de.xml'
                archiveArtifacts 'pytest_de.xml'
                junit 'pytest_de.xml'
                writeFile(file: '.coverage.de', text: readFile('.coverage'))
                stash name: 'coverage.de', includes: '.coverage.de'
            }
        }
    }
}
pytests['mysql'] = {
    node {
        if (isUnix()) {
            ws {
                deleteDir()
                unstash name: 'kallithea'
                sh """$activatevirtualenv
                    pip install --upgrade MySQL-python
                    """
                withEnv(['TEST_DB=mysql://kallithea:kallithea@jenkins_mysql/kallithea_test?charset=utf8']) {
                    if (isUnix()) {
                        sh script: """$activatevirtualenv
                            py.test -p no:sugar --cov-config .coveragerc --junit-xml=pytest_mysql.xml --cov=kallithea
                            """, returnStatus: true
                    } else {
                        bat script: """$activatevirtualenv
                            py.test -p no:sugar --cov-config .coveragerc --junit-xml=pytest_mysql.xml --cov=kallithea
                            """, returnStatus: true
                    }
                }
                sh 'sed --in-place "s/\\(classname=[\'\\"]\\)/\\1MYSQL./g" pytest_mysql.xml'
                archiveArtifacts 'pytest_mysql.xml'
                junit 'pytest_mysql.xml'
                writeFile(file: '.coverage.mysql', text: readFile('.coverage'))
                stash name: 'coverage.mysql', includes: '.coverage.mysql'
            }
        }
    }
}
pytests['postgresql'] = {
    node {
        if (isUnix()) {
            ws {
                deleteDir()
                unstash name: 'kallithea'
                sh """$activatevirtualenv
                    pip install --upgrade psycopg2
                    """
                withEnv(['TEST_DB=postgresql://kallithea:kallithea@jenkins_postgresql/kallithea_test']) {
                    if (isUnix()) {
                        sh script: """$activatevirtualenv
                            py.test -p no:sugar --cov-config .coveragerc --junit-xml=pytest_postgresql.xml --cov=kallithea
                            """, returnStatus: true
                    } else {
                        bat script: """$activatevirtualenv
                            py.test -p no:sugar --cov-config .coveragerc --junit-xml=pytest_postgresql.xml --cov=kallithea
                            """, returnStatus: true
                    }
                }
                sh 'sed --in-place "s/\\(classname=[\'\\"]\\)/\\1POSTGRES./g" pytest_postgresql.xml'
                archiveArtifacts 'pytest_postgresql.xml'
                junit 'pytest_postgresql.xml'
                writeFile(file: '.coverage.postgresql', text: readFile('.coverage'))
                stash name: 'coverage.postgresql', includes: '.coverage.postgresql'
            }
        }
    }
}
stage('Tests') {
    parallel pytests
    node {
        unstash 'coverage.sqlite'
        unstash 'coverage.de'
        unstash 'coverage.mysql'
        unstash 'coverage.postgresql'
        if (isUnix()) {
            sh script: """$activatevirtualenv
                coverage combine .coverage.sqlite .coverage.de .coverage.mysql .coverage.postgresql
                coverage xml
                """, returnStatus: true
        } else {
            bat script: """$activatevirtualenv
                coverage combine .coverage.sqlite .coverage.de .coverage.mysql .coverage.postgresql
                coverage xml
                """, returnStatus: true
        }
        try {
            step([$class: 'CoberturaPublisher', autoUpdateHealth: false, autoUpdateStability: false, coberturaReportFile: 'coverage.xml', failNoReports: false, failUnhealthy: false, failUnstable: false, maxNumberOfBuilds: 0, onlyStable: false, zoomCoverageChart: false])
        } catch (java.lang.IllegalArgumentException exc) {
            echo "You need to install the pipeline compatible 'CoberturaPublisher Plug-in' to display the coverage report."
            currentBuild.result = 'UNSTABLE'
            echo "Caught: ${exc}"
        }
    }
}