pkg_install: Add destdir attr & read rel paths. #886
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Implementation notes: Relative paths are interpreted against BUILD_WORKSPACE_DIRECTORY, not BUILD_WORKING_DIRECTORY. This is for the following reasons: The TODO tag explicitly convey the intention of using BUILD_WORKSPACE_DIRECTORY for relative paths. If destdir is specified in the attribute of the pkg_install() target, interpreting it against BUILD_WORKSPACE_DIRECTORY is much stabler. That is, no matter where your current cwd is, the destdir attribute always refers to a path relative to the workspace root. For example: ``` pkg_install(name = "my_pkg_install", destdir = "out/dest") ``` ``` cd <workspace_root>/<some_subdir> bazel run //:my_pkg_install ``` This clearly conveys that the default destdir is <workspace_root>/out/dest regardless of where the user runs the command. The cost is that the --destdir command line argument becomes trickier to understand. For example, if one is not familiar with pkg_install, and below the workspace root they run: ``` cd <workspace_root>/out bazel run //:my_pkg_install -- --destdir dest ``` They may expect the destdir to be set to <workspace_root>/out/dest; but it is in fact `<workspace_root>/dest`. We could also interpret the target attribute & the command line argument separately (e.g. pkg_install(destdir_against_workspace)), but honestly I think that's even more confusing when they interpret relative paths differently. Please let me know if this is preferred by the maintainers.
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Also, it appears that I am making I am just making the error more user friendly. |
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Hello, could you please take a look @aiuto ? |
aiuto
approved these changes
Aug 28, 2024
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Implementation notes:
Relative paths are interpreted against BUILD_WORKSPACE_DIRECTORY, not BUILD_WORKING_DIRECTORY. This is for the following reasons:
The TODO tag explicitly convey the intention of using BUILD_WORKSPACE_DIRECTORY for relative paths.
If destdir is specified in the attribute of the pkg_install() target, interpreting it against BUILD_WORKSPACE_DIRECTORY is much stabler. That is, no matter where your current cwd is, the destdir attribute always refers to a path relative to the workspace root. For example:
This clearly conveys that the default destdir is
<workspace_root>/out/dest regardless of where the user runs the command.
The cost is that the --destdir command line argument becomes trickier to understand. For example, if one is not familiar with pkg_install, and below the workspace root they run:
They may expect the destdir to be set to <workspace_root>/out/dest; but it is in fact
<workspace_root>/dest.We could also interpret the target attribute & the command line argument separately (e.g. pkg_install(destdir_against_workspace)), but honestly I think that's even more confusing when they interpret relative paths differently. Please let me know if this is preferred by the maintainers.