From ccea7f4ad99adba7d17fe98e37dc80d6be1b7f29 Mon Sep 17 00:00:00 2001
From: jonathanmetzman <31354670+jonathanmetzman@users.noreply.github.com>
Date: Thu, 18 Mar 2021 06:38:46 -0700
Subject: [base-clang] Reduce base-clang size by deleting unneeded
 binaries+libraries (#5282)

Delete unneeded LLVM tools, clang libraries and testing tools.

This reduces the image size from 1.71 GB to 901 MB.
It may be possible to improve on this by deleting some LLVM
libraries though I don't know which ones we should delete
because AFL++ might use some).

Related https://github.com/google/oss-fuzz/issues/5170
---
 .../base-clang/checkout_build_install_llvm.sh      | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)

(limited to 'infra')

diff --git a/infra/base-images/base-clang/checkout_build_install_llvm.sh b/infra/base-images/base-clang/checkout_build_install_llvm.sh
index 60429106b..f6e8ca99c 100755
--- a/infra/base-images/base-clang/checkout_build_install_llvm.sh
+++ b/infra/base-images/base-clang/checkout_build_install_llvm.sh
@@ -174,3 +174,54 @@ rm -rf $LLVM_SRC
 rm -rf $SRC/chromium_tools
 apt-get remove --purge -y $LLVM_DEP_PACKAGES
 apt-get autoremove -y
+
+# Delete unneeded parts of LLVM to reduce image size.
+# See https://github.com/google/oss-fuzz/issues/5170
+LLVM_TOOLS_TMPDIR=/tmp/llvm-tools
+mkdir $LLVM_TOOLS_TMPDIR
+# Move binaries with llvm- prefix that we want into LLVM_TOOLS_TMPDIR
+mv \
+  /usr/local/bin/llvm-ar \
+  /usr/local/bin/llvm-as \
+  /usr/local/bin/llvm-config \
+  /usr/local/bin/llvm-cov \
+  /usr/local/bin/llvm-objcopy \
+  /usr/local/bin/llvm-profdata \
+  /usr/local/bin/llvm-ranlib \
+  /usr/local/bin/llvm-symbolizer \
+  /usr/local/bin/llvm-undname \
+  $LLVM_TOOLS_TMPDIR
+# Delete remaining llvm- binaries.
+rm -rf /usr/local/bin/llvm-*
+# Restore the llvm- binaries we want to keep.
+mv $LLVM_TOOLS_TMPDIR/* /usr/local/bin/
+rm -rf $LLVM_TOOLS_TMPDIR
+
+# Remove binaries from LLVM buld that we don't need.
+rm -f \
+  /usr/local/bin/bugpoint \
+  /usr/local/bin/llc \
+  /usr/local/bin/lli \
+  /usr/local/bin/clang-check \
+  /usr/local/bin/clang-refactor \
+  /usr/local/bin/clang-offload-wrapper \
+  /usr/local/bin/clang-offload-bundler \
+  /usr/local/bin/clang-check \
+  /usr/local/bin/clang-refactor \
+  /usr/local/bin/c-index-test \
+  /usr/local/bin/clang-rename \
+  /usr/local/bin/clang-scan-deps \
+  /usr/local/bin/clang-extdef-mapping \
+  /usr/local/bin/diagtool \
+  /usr/local/bin/sanstats \
+  /usr/local/bin/dsymutil \
+  /usr/local/bin/verify-uselistorder \
+  /usr/local/bin/clang-format
+
+# Remove unneeded clang libs, CMake files from LLVM build, lld libs, and the
+# libraries.
+# Note: we need fuzzer_no_main libraries for atheris. Don't delete.
+rm -rf \
+  /usr/local/lib/libclang* \
+  /usr/local/lib/liblld* \
+  /usr/local/lib/cmake/
-- 
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