bpo-35950: Raise OSError in io.BufferedReader.truncate()

.azure-pipelines/ci.yml

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+variables:
+  manylinux: false
+  coverage: false
+
+resources:
+  containers:
+  - container: manylinux1
+    image: pyca/cryptography-manylinux1:x86_64
+
+jobs:
+- job: Prebuild
+  displayName: Pre-build checks
+
+  pool:
+    vmImage: ubuntu-16.04
+
+  steps:
+  - template: ./prebuild-checks.yml
+
+
+- job: Docs_PR
+  displayName: Docs PR
+  dependsOn: Prebuild
+  condition: and(succeeded(), eq(dependencies.Prebuild.outputs['docs.run'], 'true'))
+
+  pool:
+    vmImage: ubuntu-16.04
+
+  steps:
+  - template: ./docs-steps.yml
+    parameters:
+      upload: true
+
+
+- job: macOS_CI_Tests
+  displayName: macOS CI Tests
+  dependsOn: Prebuild
+  condition: and(succeeded(), eq(dependencies.Prebuild.outputs['tests.run'], 'true'))
+
+  variables:
+    testRunTitle: '$(build.sourceBranchName)-macos'
+    testRunPlatform: macos
+
+  pool:
+    vmImage: xcode9-macos10.13
+
+  steps:
+  - template: ./macos-steps.yml
+
+
+- job: Ubuntu_CI_Tests
+  displayName: Ubuntu CI Tests
+  dependsOn: Prebuild
+  condition: and(succeeded(), eq(dependencies.Prebuild.outputs['tests.run'], 'true'))
+
+  pool:
+    vmImage: ubuntu-16.04
+
+  variables:
+    testRunTitle: '$(build.sourceBranchName)-linux'
+    testRunPlatform: linux
+    openssl_version: 1.1.1b
+
+  steps:
+  - template: ./posix-steps.yml
+    parameters:
+      dependencies: apt
+
+
+- job: ManyLinux1_CI_Tests
+  displayName: ManyLinux1 CI Tests
+  dependsOn: Prebuild
+  condition: |
+    and(
+        and(
+            succeeded(),
+            eq(variables['manylinux'], 'true')
+        ),
+        eq(dependencies.Prebuild.outputs['tests.run'], 'true')
+    )
+
+  pool:
+    vmImage: ubuntu-16.04
+
+  container: manylinux1
+
+  variables:
+    testRunTitle: '$(build.sourceBranchName)-manylinux1'
+    testRunPlatform: manylinux1
+    openssl_version: ''
+
+  steps:
+  - template: ./posix-steps.yml
+    parameters:
+      dependencies: yum
+      sudo_dependencies: ''
+      xvfb: false
+      patchcheck: false
+
+
+- job: Ubuntu_Coverage_CI_Tests
+  displayName: Ubuntu CI Tests (coverage)
+  dependsOn: Prebuild
+  condition: |
+    and(
+        and(
+            succeeded(),
+            eq(variables['coverage'], 'true')
+        ),
+        eq(dependencies.Prebuild.outputs['tests.run'], 'true')
+    )
+
+  pool:
+    vmImage: ubuntu-16.04
+
+  variables:
+    testRunTitle: '$(Build.SourceBranchName)-linux-coverage'
+    testRunPlatform: linux-coverage
+    openssl_version: 1.1.1b
+
+  steps:
+  - template: ./posix-steps.yml
+    parameters:
+      dependencies: apt
+      coverage: true
+
+
+- job: Windows_CI_Tests
+  displayName: Windows CI Tests
+  dependsOn: Prebuild
+  condition: and(succeeded(), eq(dependencies.Prebuild.outputs['tests.run'], 'true'))
+
+  pool:
+    vmImage: vs2017-win2016
+
+  strategy:
+    matrix:
+      win32:
+        arch: win32
+        buildOpt:
+        testRunTitle: '$(Build.SourceBranchName)-win32'
+        testRunPlatform: win32
+      win64:
+        arch: amd64
+        buildOpt: '-p x64'
+        testRunTitle: '$(Build.SourceBranchName)-win64'
+        testRunPlatform: win64
+    maxParallel: 2
+
+  steps:
+  - template: ./windows-steps.yml
+
+  - template: ./windows-layout-steps.yml
+    parameters:
+      kind: nuget
+  - template: ./windows-layout-steps.yml
+    parameters:
+      kind: embed
+  - template: ./windows-layout-steps.yml
+    parameters:
+      kind: appx
+      fulltest: true

.azure-pipelines/docs-steps.yml

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+parameters:
+  latex: false
+  upload: false
+
+steps:
+- checkout: self
+  clean: true
+  fetchDepth: 5
+
+- task: UsePythonVersion@0
+  displayName: 'Use Python 3.6 or later'
+  inputs:
+    versionSpec: '>=3.6'
+
+- script: python -m pip install sphinx==1.8.2 blurb python-docs-theme
+  displayName: 'Install build dependencies'
+
+- ${{ if ne(parameters.latex, 'true') }}:
+  - script: make check suspicious html PYTHON=python
+    workingDirectory: '$(build.sourcesDirectory)/Doc'
+    displayName: 'Build documentation'
+
+- ${{ if eq(parameters.latex, 'true') }}:
+  - script: sudo apt-get update && sudo apt-get install -qy --force-yes texlive-full 
+    displayName: 'Install LaTeX'
+
+  - script: make dist PYTHON=python SPHINXBUILD='python -m sphinx' BLURB='python -m blurb'
+    workingDirectory: '$(build.sourcesDirectory)/Doc'
+    displayName: 'Build documentation'
+
+- ${{ if eq(parameters.upload, 'true') }}:
+  - task: PublishBuildArtifacts@1
+    displayName: 'Publish docs'
+
+    inputs:
+      PathToPublish: '$(build.sourcesDirectory)/Doc/build'
+      ArtifactName: docs
+      publishLocation: Container
+
+  - ${{ if eq(parameters.latex, 'true') }}:
+    - task: PublishBuildArtifacts@1
+      displayName: 'Publish dist'
+      inputs:
+        PathToPublish: '$(build.sourcesDirectory)/Doc/dist'
+        ArtifactName: docs_dist
+        publishLocation: Container

.azure-pipelines/macos-steps.yml

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+steps:
+- checkout: self
+  clean: true
+  fetchDepth: 5
+
+- script: ./configure --with-pydebug --with-openssl=/usr/local/opt/openssl --prefix=/opt/python-azdev
+  displayName: 'Configure CPython (debug)'
+
+- script: make -s -j4
+  displayName: 'Build CPython'
+
+- script: make pythoninfo
+  displayName: 'Display build info'
+
+- script: make buildbottest TESTOPTS="-j4 -uall,-cpu --junit-xml=$(build.binariesDirectory)/test-results.xml"
+  displayName: 'Tests'
+
+- task: PublishTestResults@2
+  displayName: 'Publish Test Results'
+  inputs:
+    testResultsFiles: '$(build.binariesDirectory)/test-results.xml'
+    mergeTestResults: true
+    testRunTitle: $(testRunTitle)
+    platform: $(testRunPlatform)
+  condition: succeededOrFailed()

.azure-pipelines/posix-deps-apt.sh

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+apt-get update
+
+apt-get -yq install \
+    build-essential \
+    zlib1g-dev \
+    libbz2-dev \
+    liblzma-dev \
+    libncurses5-dev \
+    libreadline6-dev \
+    libsqlite3-dev \
+    libssl-dev \
+    libgdbm-dev \
+    tk-dev \
+    lzma \
+    lzma-dev \
+    liblzma-dev \
+    libffi-dev \
+    uuid-dev \
+    xvfb
+
+if [ ! -z "$1" ]
+then
+  echo ##vso[task.prependpath]$PWD/multissl/openssl/$1
+  echo ##vso[task.setvariable variable=OPENSSL_DIR]$PWD/multissl/openssl/$1
+  python3 Tools/ssl/multissltests.py --steps=library --base-directory $PWD/multissl --openssl $1 --system Linux
+fi

.azure-pipelines/posix-steps.yml

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+parameters:
+  coverage: false
+  sudo_dependencies: sudo
+  dependencies: apt
+  patchcheck: true
+  xvfb: true
+
+steps:
+- checkout: self
+  clean: true
+  fetchDepth: 5
+
+# Work around a known issue affecting Ubuntu VMs on Pipelines
+- script: sudo setfacl -Rb /home/vsts
+  displayName: 'Workaround ACL issue'
+
+- script: ${{ parameters.sudo_dependencies }} ./.azure-pipelines/posix-deps-${{ parameters.dependencies }}.sh $(openssl_version)
+  displayName: 'Install dependencies'
+
+- script: ./configure --with-pydebug
+  displayName: 'Configure CPython (debug)'
+
+- script: make -s -j4
+  displayName: 'Build CPython'
+
+- ${{ if eq(parameters.coverage, 'true') }}:
+  - script: ./python -m venv venv && ./venv/bin/python -m pip install -U coverage
+    displayName: 'Set up virtual environment'
+
+  - script: ./venv/bin/python -m test.pythoninfo
+    displayName: 'Display build info'
+
+  - script: |
+      $COMMAND -m coverage run --pylib -m test \
+                --fail-env-changed \
+                -uall,-cpu \
+                --junit-xml=$(build.binariesDirectory)/test-results.xml \
+                -x test_multiprocessing_fork \
+                -x test_multiprocessing_forkserver \
+                -x test_multiprocessing_spawn \
+                -x test_concurrent_futures
+    displayName: 'Tests with coverage'
+    env:
+      ${{ if eq(parameters.xvfb, 'true') }}:
+        COMMAND: xvfb-run ./venv/bin/python
+      ${{ if ne(parameters.xvfb, 'true') }}:
+        COMMAND: ./venv/bin/python
+
+  - script: ./venv/bin/python -m coverage xml
+    displayName: 'Generate coverage.xml'
+
+  - script: source ./venv/bin/activate && bash <(curl -s https://codecov.io/bash)
+    displayName: 'Publish code coverage results'
+
+
+- ${{ if ne(parameters.coverage, 'true') }}:
+  - script: make pythoninfo
+    displayName: 'Display build info'
+
+  - script: $COMMAND buildbottest TESTOPTS="-j4 -uall,-cpu --junit-xml=$(build.binariesDirectory)/test-results.xml"
+    displayName: 'Tests'
+    env:
+      ${{ if eq(parameters.xvfb, 'true') }}:
+        COMMAND: xvfb-run make
+      ${{ if ne(parameters.xvfb, 'true') }}:
+        COMMAND: make
+
+- ${{ if eq(parameters.patchcheck, 'true') }}:
+  - script: ./python Tools/scripts/patchcheck.py --travis true
+    displayName: 'Run patchcheck.py'
+    condition: and(succeeded(), eq(variables['Build.Reason'], 'PullRequest'))
+
+
+- task: PublishTestResults@2
+  displayName: 'Publish Test Results'
+  inputs:
+    testResultsFiles: '$(build.binariesDirectory)/test-results.xml'
+    mergeTestResults: true
+    testRunTitle: $(testRunTitle)
+    platform: $(testRunPlatform)
+  condition: succeededOrFailed()