Deprecate USER in favor of BUILD_USERNAME
Bug: 122270019 Test: treehugger, codesearch
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Changes.md
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Changes.md
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# Build System Changes for Android.mk Writers
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## `USER` deprecation {#USER}
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`USER` will soon be `nobody` in many cases due to the addition of a sandbox
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around the Android build. Most of the time you shouldn't need to know the
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identity of the user running the build, but if you do, it's available in the
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make variable `BUILD_USERNAME` for now.
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Similarly, the `hostname` tool will also be returning a more consistent value
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of `android-build`. The real value is available as `BUILD_HOSTNAME`.
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## `BUILD_NUMBER` removal from Android.mk {#BUILD_NUMBER}
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`BUILD_NUMBER` should not be used directly in Android.mk files, as it would
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