[vcpkg] Enable reentrant vcpkg calls #13751
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Via envvars VCPKG_COMMAND and VCPKG_X_RECURSIVE_DATA. Child processes can call vcpkg via "$VCPKG_COMMAND <args>" in limited internal circumstances.
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* [vcpkg] Enable recursive vcpkg calls Via envvars VCPKG_COMMAND and VCPKG_X_RECURSIVE_DATA. Child processes can call vcpkg via "$VCPKG_COMMAND <args>" in limited internal circumstances. * [vcpkg] Address CR comments * [vcpkg] Do not move through Optional<&> into Optional<T> Co-authored-by: Robert Schumacher <roschuma@microsoft.com>
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This PR enables the vcpkg executable to support limited reentrancy. This potentially allows the tool to provide certain services to the inner package builds, such as downloading, locking, and more.
This is analogous to the common CMake pattern of
except it will use
To minimize maintenance burden on intermediate callers, any information that needs to be exchanged between the outer vcpkg process and the inner reentrant call is piped through a JSON document stored in the environment variable
$VCPKG_X_RECURSIVE_DATA. Intermediate callers must not examine or modify this document in any way.Additional notes about this v1 implementation:
$VCPKG_X_RECURSIVE_DATAtopoisonafter the first reentrance ensuring that further reentrancies will fail fast$VCPKG_FORCE_SYSTEM_BINARIESshould be reorganized into$VCPKG_X_RECURSIVE_DATAonce all references are moved into reentrant services. At the time of this PR, there is a reference to this environment variable invcpkg_configure_cmake()