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incompatible_disallow_conflicting_providers: Validate that only one instance of a provider is being returned by a skylark rule #5902

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c-parsons opened this Issue Aug 15, 2018 · 3 comments

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c-parsons commented Aug 15, 2018

Consider the following rule implementation function:

MyProvider = provider()

def _rule_impl(ctx):
    ...
    return [MyProvider(foo = 1), MyProvider(foo=2)]

The current behavior is that the latter of the two providers is propagated, and the former is ignored. This is a particularly error-prone behavior and we should guard against it.

@c-parsons c-parsons self-assigned this Aug 15, 2018

bazel-io pushed a commit that referenced this issue Aug 15, 2018

Throw a rule error when a skylark rule implementation returns multipl…
…e providers of the same type.

This error-throwing functionality is tied to semantic flag --incompatible_disallow_conflicting_providers

Partial fix for #5902. (That issue will still track migration).

RELNOTES: A rule error will be thrown if a Skylark rule implementation function returns multiple providers of the same type. Try the `--incompatible_disallow_conflicting_providers` flag to ensure your code is forward-compatible.
PiperOrigin-RevId: 208884695
@c-parsons

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c-parsons commented Aug 15, 2018

5a6fc8d contains a fix for this, attached to the flag --incompatible_disallow_conflicting_providers.

This issue will remain open to track the migration solution.

@laurentlb

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laurentlb commented Oct 24, 2018

Can we switch the flag for Bazel 0.20?
If so, we have to add it to the Bazel 0.19 release announcement.

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c-parsons commented Oct 24, 2018

Hmm. I don't anticipate any blockers, but it looks like I've failed to add the Backward Compatibility information for this flag (which we usually link to in the announcement). I'll send a change for that.

@bazel-io bazel-io closed this in 8ef1e6b Oct 29, 2018

@dslomov dslomov changed the title from Validate that only one instance of a provider is being returned by a skylark rule to incompatible_disallow_conflicting_providers: Validate that only one instance of a provider is being returned by a skylark rule Oct 31, 2018

@dslomov dslomov added this to the breaking-change-0.20 milestone Oct 31, 2018

bazel-io pushed a commit that referenced this issue Nov 30, 2018

Release 0.20.0 (2018-11-30)
Baseline: 7bf7f03

Cherry picks:

   + fd52341:
     update bazel-toolchains pin to latest release Part of changes to
     allow bazelci to use 0.19.0 configs. RBE toolchain configs at or
     before 0.17.0 are not compatible with bazel 0.19.0 or above.
   + 241f28d:
     Revert "Toggle --incompatible_disable_late_bound_option_defaults
     flag."
   + f7e5aef:
     Add cc_toolchain targets for the new entries in the default
     cc_toolchain_suite.
   + d2920e3:
     Revert "WindowsFileSystem: open files with delete-sharing"

[Breaking changes in 0.20](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Abreaking-change-0.20)

  - [--incompatible_remove_native_http_archive](#6570).
  - [--incompatible_remove_native_git_repository](#6569).
  - [--incompatible_disable_cc_toolchain_label_from_crosstool_proto](#6434).
  - [--incompatible_disable_depset_in_cc_user_flags](#6384).
  - [--incompatible_disable_cc_configuration_make_variables](#6381).
  - [--incompatible_disallow_conflicting_providers](#5902).
  - [--incompatible_range_type](#5264).

[0.20 is a migration window for the following changes](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Amigration-0.20)

  - [--incompatible_use_jdk10_as_host_javabase](#6661)
  - [--incompatible_use_remotejdk_as_host_javabase](#6656)
  - [--incompatible_disable_sysroot_from_configuration](#6565)
  - [--incompatible_provide_cc_toolchain_info_from_cc_toolchain_suite](#6537)
  - [--incompatible_disable_depset_in_cc_user_flags](#6383)
  - [--incompatible_package_name_is_a_function](#5827)

[Breaking changes in the next release (0.21)](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Abreaking-change-0.21)

  - [--incompatible_use_jdk10_as_host_javabase](#6661)
  - [--incompatible_use_remotejdk_as_host_javabase](#6656)
  - [--incompatible_disable_sysroot_from_configuration](#6565)
  - [--incompatible_provide_cc_toolchain_info_from_cc_toolchain_suite](#6537)
  - [--incompatible_disable_depset_in_cc_user_flags](#6383)
  - [--incompatible_disallow_data_transition](#6153)
  - [--incompatible_package_name_is_a_function](#5827)
  - [--incompatible_disallow_slash_operator](#5823)
  - [--incompatible_static_name_resolution](#5637)

Incompatible changes:

  - the --experimental_no_dotd_scanning_with_modules command line
    argument is not supported anymore.
  - The --prune_cpp_modules command line option is not supported
    anymore.
  - the --experimental_prune_cpp_input_discovery command line option
    is not supported anymore.

New features:

  - Added support for Android NDK r18.

Important changes:

  - The 'default' parameter of attr.output and attr.output_list is
    removed. This is controlled by
    --incompatible_no_output_attr_default
  - A number of platform-related Starlark APIs which were previously
    marked "experimental" are now disabled by default, and may be
    enabled via --experimental_platforms_api
  - Make legacy-test-support ("legacy_test-<api-level>") from
    android_sdk_repository neverlink. The legacy test support
    libraries shouldn't be built into test binaries. To make them
    available at runtime, developers should declare them via
    uses-library:
    https://developer.android.com/training/testing/set-up-project#andr
    oid-test-base
  - query remote server Capabilities (per REAPI v2)
  - CppRules: All cc_toolchains depended on from
    cc_toolchain_suite.toolchains are now analyzed when not using
    platforms in order to select the right cc_toolchain.
  - removed obsolete --explicit_jre_deps flag.
  - Incompatible flag
    --incompatible_disable_legacy_cpp_toolchain_skylark_api was
    flipped.
  - Improve error messaging when unsupport proguard options are
    specified at the library level.
  - Incompatible flag
    --incompatible_disable_legacy_cpp_toolchain_skylark_api was
    flipped.
  - Incompatible flag
    --incompatible_disable_legacy_cpp_toolchain_skylark_api was
    flipped.
  - The --incompatible_disable_late_bound_option_defaults flag has
    been flipped (#6384)
  - Incompatible flag
    --incompatible_disable_legacy_flags_cc_toolchain_api was flipped
    (#6434)
  - Fixed issue where ctx.resolve_command created conflicting
    intermediate files when resolve_command was called multiple times
    within the same rule invocation with a long command attribute.
  - Incompatible flag
    --incompatible_disable_cc_configuration_make_variables was
    flipped (#6381)
  - If the --javabase flag is unset, it Bazel locates a JDK using
    the JAVA_HOME environment variable and searching the PATH. If no
    JDK is found --javabase will be empty, and builds targeting Java
    will not
    be supported. Previously Bazel would fall back to using the
    embedded
    JDK as a --javabase, but this is no longer default behaviour. A
    JDK should
    be explicitly installed instead to enable Java development
  - Bazel will now shut down when idle for 5 minutes and the system
    is low on RAM (linux only).
  - CROSSTOOL file is now read from the package of cc_toolchain, not
    from
    the package of cc_toolchain_suite. This is not expected to break
    anybody since
    cc_toolchain_suite and cc_toolchain are commonly in the same
    package.
  - All overrides of Starlark's ctx.new_file function are now
    deprecated.
      Try the `--incompatible_new_actions_api` flag to ensure your
    code is forward-compatible.
  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto
    was flipped.
  - Introduce --(no)shutdown_on_low_sys_mem startup flag to toggle
    idle low-memory shutdown, disabled by default.
  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto
    was flipped.
  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto
    was flipped.
  - CppRules: All cc_toolchains depended on from
    cc_toolchain_suite.toolchains are now analyzed when not using
    platforms in order to select the right cc_toolchain.
  - The function `attr.license` is deprecated and will be removed.
      It can be disabled now with `--incompatible_no_attr_license`.
  - `range()` function now returns a lazy value
    (`--incompatible_range_type` is now set by default).
  - The code coverage report now includes the actual paths to header
    files instead of the ugly,
    Bazel generated, virtual includes path.
  - `--incompatible_disallow_conflicting_providers` has been switched
    to true
  - Add new flag `--incompatible_disable_systool_from_configration` to
    disable loading the systool from CppConfiguration.
  - Add new flag `--incompatible_disable_sysroot_from_configuration`
    to
    disable loading the systool from CppConfiguration.
  - Sorting remote Platform properties for remote execution. May
    affect cache keys!
  - Use different server log files per Bazel server process; java.log
    is
    now a symlink to the latest log.

This release contains contributions from many people at Google, as well as a7g4 <a7g4@a7g4.net>, Alan <alan.agius@betssongroup.com>, Asaf Flescher <asafflesch@gmail.com>, Benjamin Peterson <bp@benjamin.pe>, Ed Schouten <ed.schouten@prodrive-technologies.com>, George Gensure <ggensure@uber.com>, George Kalpakas <kalpakas.g@gmail.com>, Greg <gregestren@users.noreply.github.com>, Irina Iancu <iirina@users.noreply.github.com>, Keith Smiley <keithbsmiley@gmail.com>, Loo Rong Jie <loorongjie@gmail.com>, Mark Zeren <mzeren@vmware.com>, Petros Eskinder <petroseskinder@users.noreply.github.com>, rachcatch <rachelcatchpoole@hotmail.com>, Robert Brown <robert.brown@gmail.com>, Robert Gay <robert.gay@redfin.com>, Salty Egg <2281521+zhouhao@users.noreply.github.com>.

ahirreddy pushed a commit to ahirreddy/bazel that referenced this issue Dec 1, 2018

Release 0.20.0 (2018-11-30)
Baseline: 7bf7f03

Cherry picks:

   + fd52341:
     update bazel-toolchains pin to latest release Part of changes to
     allow bazelci to use 0.19.0 configs. RBE toolchain configs at or
     before 0.17.0 are not compatible with bazel 0.19.0 or above.
   + 241f28d:
     Revert "Toggle --incompatible_disable_late_bound_option_defaults
     flag."
   + f7e5aef:
     Add cc_toolchain targets for the new entries in the default
     cc_toolchain_suite.
   + d2920e3:
     Revert "WindowsFileSystem: open files with delete-sharing"

[Breaking changes in 0.20](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Abreaking-change-0.20)

  - [--incompatible_remove_native_http_archive](bazelbuild#6570).
  - [--incompatible_remove_native_git_repository](bazelbuild#6569).
  - [--incompatible_disable_cc_toolchain_label_from_crosstool_proto](bazelbuild#6434).
  - [--incompatible_disable_depset_in_cc_user_flags](bazelbuild#6384).
  - [--incompatible_disable_cc_configuration_make_variables](bazelbuild#6381).
  - [--incompatible_disallow_conflicting_providers](bazelbuild#5902).
  - [--incompatible_range_type](bazelbuild#5264).

[0.20 is a migration window for the following changes](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Amigration-0.20)

  - [--incompatible_use_jdk10_as_host_javabase](bazelbuild#6661)
  - [--incompatible_use_remotejdk_as_host_javabase](bazelbuild#6656)
  - [--incompatible_disable_sysroot_from_configuration](bazelbuild#6565)
  - [--incompatible_provide_cc_toolchain_info_from_cc_toolchain_suite](bazelbuild#6537)
  - [--incompatible_disable_depset_in_cc_user_flags](bazelbuild#6383)
  - [--incompatible_package_name_is_a_function](bazelbuild#5827)

[Breaking changes in the next release (0.21)](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+label%3Abreaking-change-0.21)

  - [--incompatible_use_jdk10_as_host_javabase](bazelbuild#6661)
  - [--incompatible_use_remotejdk_as_host_javabase](bazelbuild#6656)
  - [--incompatible_disable_sysroot_from_configuration](bazelbuild#6565)
  - [--incompatible_provide_cc_toolchain_info_from_cc_toolchain_suite](bazelbuild#6537)
  - [--incompatible_disable_depset_in_cc_user_flags](bazelbuild#6383)
  - [--incompatible_disallow_data_transition](bazelbuild#6153)
  - [--incompatible_package_name_is_a_function](bazelbuild#5827)
  - [--incompatible_disallow_slash_operator](bazelbuild#5823)
  - [--incompatible_static_name_resolution](bazelbuild#5637)

Incompatible changes:

  - the --experimental_no_dotd_scanning_with_modules command line
    argument is not supported anymore.
  - The --prune_cpp_modules command line option is not supported
    anymore.
  - the --experimental_prune_cpp_input_discovery command line option
    is not supported anymore.

New features:

  - Added support for Android NDK r18.

Important changes:

  - The 'default' parameter of attr.output and attr.output_list is
    removed. This is controlled by
    --incompatible_no_output_attr_default
  - A number of platform-related Starlark APIs which were previously
    marked "experimental" are now disabled by default, and may be
    enabled via --experimental_platforms_api
  - Make legacy-test-support ("legacy_test-<api-level>") from
    android_sdk_repository neverlink. The legacy test support
    libraries shouldn't be built into test binaries. To make them
    available at runtime, developers should declare them via
    uses-library:
    https://developer.android.com/training/testing/set-up-project#andr
    oid-test-base
  - query remote server Capabilities (per REAPI v2)
  - CppRules: All cc_toolchains depended on from
    cc_toolchain_suite.toolchains are now analyzed when not using
    platforms in order to select the right cc_toolchain.
  - removed obsolete --explicit_jre_deps flag.
  - Incompatible flag
    --incompatible_disable_legacy_cpp_toolchain_skylark_api was
    flipped.
  - Improve error messaging when unsupport proguard options are
    specified at the library level.
  - Incompatible flag
    --incompatible_disable_legacy_cpp_toolchain_skylark_api was
    flipped.
  - Incompatible flag
    --incompatible_disable_legacy_cpp_toolchain_skylark_api was
    flipped.
  - The --incompatible_disable_late_bound_option_defaults flag has
    been flipped (bazelbuild#6384)
  - Incompatible flag
    --incompatible_disable_legacy_flags_cc_toolchain_api was flipped
    (bazelbuild#6434)
  - Fixed issue where ctx.resolve_command created conflicting
    intermediate files when resolve_command was called multiple times
    within the same rule invocation with a long command attribute.
  - Incompatible flag
    --incompatible_disable_cc_configuration_make_variables was
    flipped (bazelbuild#6381)
  - If the --javabase flag is unset, it Bazel locates a JDK using
    the JAVA_HOME environment variable and searching the PATH. If no
    JDK is found --javabase will be empty, and builds targeting Java
    will not
    be supported. Previously Bazel would fall back to using the
    embedded
    JDK as a --javabase, but this is no longer default behaviour. A
    JDK should
    be explicitly installed instead to enable Java development
  - Bazel will now shut down when idle for 5 minutes and the system
    is low on RAM (linux only).
  - CROSSTOOL file is now read from the package of cc_toolchain, not
    from
    the package of cc_toolchain_suite. This is not expected to break
    anybody since
    cc_toolchain_suite and cc_toolchain are commonly in the same
    package.
  - All overrides of Starlark's ctx.new_file function are now
    deprecated.
      Try the `--incompatible_new_actions_api` flag to ensure your
    code is forward-compatible.
  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto
    was flipped.
  - Introduce --(no)shutdown_on_low_sys_mem startup flag to toggle
    idle low-memory shutdown, disabled by default.
  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto
    was flipped.
  - --incompatible_disable_cc_toolchain_label_from_crosstool_proto
    was flipped.
  - CppRules: All cc_toolchains depended on from
    cc_toolchain_suite.toolchains are now analyzed when not using
    platforms in order to select the right cc_toolchain.
  - The function `attr.license` is deprecated and will be removed.
      It can be disabled now with `--incompatible_no_attr_license`.
  - `range()` function now returns a lazy value
    (`--incompatible_range_type` is now set by default).
  - The code coverage report now includes the actual paths to header
    files instead of the ugly,
    Bazel generated, virtual includes path.
  - `--incompatible_disallow_conflicting_providers` has been switched
    to true
  - Add new flag `--incompatible_disable_systool_from_configration` to
    disable loading the systool from CppConfiguration.
  - Add new flag `--incompatible_disable_sysroot_from_configuration`
    to
    disable loading the systool from CppConfiguration.
  - Sorting remote Platform properties for remote execution. May
    affect cache keys!
  - Use different server log files per Bazel server process; java.log
    is
    now a symlink to the latest log.

This release contains contributions from many people at Google, as well as a7g4 <a7g4@a7g4.net>, Alan <alan.agius@betssongroup.com>, Asaf Flescher <asafflesch@gmail.com>, Benjamin Peterson <bp@benjamin.pe>, Ed Schouten <ed.schouten@prodrive-technologies.com>, George Gensure <ggensure@uber.com>, George Kalpakas <kalpakas.g@gmail.com>, Greg <gregestren@users.noreply.github.com>, Irina Iancu <iirina@users.noreply.github.com>, Keith Smiley <keithbsmiley@gmail.com>, Loo Rong Jie <loorongjie@gmail.com>, Mark Zeren <mzeren@vmware.com>, Petros Eskinder <petroseskinder@users.noreply.github.com>, rachcatch <rachelcatchpoole@hotmail.com>, Robert Brown <robert.brown@gmail.com>, Robert Gay <robert.gay@redfin.com>, Salty Egg <2281521+zhouhao@users.noreply.github.com>.
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