To a skylark summary

To a, skylark, summary


to a skylark summary

SparkNotes: Shelleys poetry: to a, skylark

Jdk_path t jdk_home elif env. Jdk_path system usr/libexec/java_home -v." attrs. Jdk_path if not attrs. Jdk_path: fail could not find jdk home, please set it with bazel init java:jdk_path/path/to/jdk attrs._some_other_path first(glob usr/bin/java usr/local/bin/java attrs is the list of attributes. It basically contains the list of rules we should generate in the corresponding package. Please note That all labels are replaced by relative ones as it should not be able to write out of the package. Def generate_method(attrs scratch_file build.

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This is needed because user probably want to initialize a workspace tooling on a plane This proposal would probably add a new top-level package. We should really take care of the naming convention for default top packages (i.e., tools, tools/defaults, visibility, external, resume condition.). We are going to make some user unhappy if they cannot have an external directory at the top of their workspace (I would just not use a build system that goes against my workspace structure). While it is still time to do it, we should rename them with a nice naming convention. A good way to do it is to make top-package name constants, possibly settable in the workspace file (so we can actually keep the name we like but user that are bothered by that can change it). As we will remove the tools directory from the workspace, it makes sense to add another prelude bazel file somewhere else. As the workspace file controls the workspace, it makes sense to have the prelude bazel logic in it (and the load statement should support labels so that a user can actually specify remote repository labels). Skylark-like code examples of configuration functions This is just a quick draft, please feel free to propose improvements: env is the environment, attrs are the values set either from the command-line or from loading the package def autodetect_method(env, attrs if not attrs. Java_version: If not given in the command line nor loaded attrs. Java_version 8 if not attrs.

How do we ship a skylark rule set? Can we have load statement loading a full set of rules?). Create configuration for the existing skylark build rules. If we support load statement with label, we can then create a repository for skylark rules. Various comments we should get rid of the requirement for a tools/defaults/build dom file. To works correctly, we need some local caching of the bazel repository so tools are available. We could have bazelrc specify a global path to the local cache (with /etc/zelrc being loaded first to /.bazelrc). We could use a /.bazel directory to put an updatable tools cache also.

to a skylark summary

Skylark by dezso kosztolányi new York review books

The hidden tools directory will have a workspace file and will have an automatic local repository with the "init" name so that we can actually bind targets from it into our workspace. Add bazel init that support the configuration for native packages in java, that is: java, c, genrule and test. This would create the necessary mechanisms for supporting the developer and the basic user interface. This commands will be totally in java for now and should trigger the fetch part of the remote repository. Design and implement the language extension ala skylark using the design for the java version of point. Convert the existing configuration into that language. Integrate the configuration with skylark (i.e. Skylark rules writer can add configuration step). We should here decide on how it should be included (as a separate script?

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to a skylark summary

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Prospective idea: bazel init should explore the build file to find the skylark load statements, determine if there is an associated init script and use. Developer interface This section presents the support for developer that wants to add autoconfiguration for a ruleset. The developer adding a configuration would provide with a configuration script for. This script will be in charge of creating the package in the tools directory during bazel init (i.e., the script for java support will construct the /tools/jdk package in the "hidden" package path). Because of skylark rules and the fact that the configuration script should run before having access to the c and java tooling, this seems unreasonable to use a compiled language (java or C) for this script.

We could use the skylark support to make it a subset of python or we could use a bash script. Python support would be portable since provided by bazel itself and consistent with skylark. It also gives immediate support for manipulating build files. So keeping a "skylark-like" syntax, the interface would look like: configuration( name, name restaurant of the tools package to configure autodetect_method, the auto detection method generate_method, the actual package generation load_method, A method to load the attributes presented to the user. Replace non loaded attribute (attribute still undefined after load_method) if and only if -rerun option is provided Run generate_method for each script Fetch all non up to date dependencies friend of remote repository see appendix B for examples of such methods. Implementation plan Add the hidden tools directory and have it binded with package path when no tools directory exists.

When the user type bazel init, the configuration process starts with the default configuration (e.g., configure for gold features such as c, java,.). It should try to autodetect as much as possible. If a language configuration needs something it cannot autodetect, then it can prompt the user for the missing information and the configuration can fail if something is really wrong. On default installation, bazel init should not prompt the user at all. When the process finishes, the command should output a summary of the configuration.


The configuration is then stored in a "hidden" directory which is similar to our current tools package. By default, the labels in the configuration would direct to that package (always mapped as a top-level package). The "hidden directory would live in (output_base init/tools and be mapped using the package path mechanism. The -overwrite option would be needed to rerun the automatic detection and overwrite everything including the eventual user-set options. For the hermetic mode, the user has to recreate the default tools package inside the workspace. If the user has a package with the same name in the workspace, then the "hidden" directory should be ignored (-package_path). To set a configuration option, the user would type bazel init java:jdk/path/to/jdk or to use the autodetection on a specific option bazel init java:jdk. The list of settings group could be obtained by bazel init list and the list of option with their value for a specific language by bazel init list group. Bazel init list all could give the full configuration of all activated groups.

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hermetic : this is the google way of thing: the user check-in everything that he thinks belong to the workspace and the init command should do nothing. If the configuration mechanism changes or the user wants to tune the configuration, it should support to modify the configuration,. E., update the various paths or change the default options. Bazel init could:. Initialize a new workspace: as it would support configuring a whole tool directory, it might be umum quite close to actually initializing a new workspace. User interface to be efficient, when the tools directory is missing, bazel build should display an informative error message to actually run bazel init. Configuration is basically just setting a list of build constants like the path to the jdk, the list of C flags, etc.

to a skylark summary

Not be available in hermetic version (i.e. Google version of bazel,. E., java and C tooling configuration should be separated. Allow skylark add-ons to specify their configuration, this should be pluggable so we can actually activate configuration per rule set. Support at least 3 modes corresponding to each envisioned use-cases: UC1. installed (default mode a "hidden" tools package contains the detected tool paths (gcc, the jdks,.) as well as their configuration (basically the content of the current /tools package). This package should be constructed as much as possibly automatically with a way for the user to overwrite detected settings. semi-hermetic : the "hidden" tools package is used only for linking the actual tool paths but the configuration would be checked-in into the workspace (in a similar way that what is currently done in bazel). The "hidden" tools package could contains several pros versions of the same tools (e.g., jdk-8, jdk-7,.) and the workspace link to a specific one.

checked into the version control system). However, the user does not want to have c information (i.e. Tools/cpp) in the vcs. The user wants his build to be hermetic and he wants to set up everything in his tools directory (Google use-case). Notes, this document addresses the special case of the configuration of the tools package, mechanisms presented here could be extended to any dependency that needs to be configured (e.g., detecting the installed libncurse) but that is out of the scope of this document. Anywhere in this document we refer to the tools package as the package that will receive the current tools package content, it does not commit to keep that package name. Requirements bazel init should:.

For example, c crosstool configuration requires path to gcc or java configuration requires the path to the jdk. Autodetecting those paths from bazel would be broken because each ruleset requires its own configuration (c crosstool information is totally different from jdk detection or from go root detection). Therefore, providing a general mechanism to configure. Bazel tooling seems natural. To have bazel self-contained, we will ship this mechanism as an additional command of bazel. Because this command deals with non-hermetic parts of bazel, this command should also group all non-hermetic steps (i.e. It should fetch the dependencies from the remote repositories) so a user can run it and retrolisthesis get on a plane with everything needed. Considered use-cases, we consider the 3 following use-cases: UC1. The user wants to not worry about tools configuration and use the default one for golden languages (java, c, shell) and wants to also activate an optional language (Go).

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This design document has been replaced. Skylark remote repositories and is maintained here just for vietnamese reference. A configuration mechanism for bazel, design documents are not descriptions of the current functionality of bazel. Always go to the documentation for current information. Status: deprecated, replaced by, skylark remote repositories. Author: design document published :,. Rationale, bazel tooling needs special setup to work.


To a skylark summary
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Pinterest tools boardBooster skylark virtual m/boardbooster/ so i might have a skylark virtual Services blog board then another secret version that would be called - skylark virtual Services. Summary : skylark / reviewed By: adamjernst Differential revision: D7080878.

5 Comment

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