infra: add script to capture replayable commands

[DavidKorczynski]

Giving #12592 (comment) a go using bashlex

Will place a script in /out/replay-build-script.sh with the script that can be used for replaying.

This is still poc and will need some adjustments, e.g. we need some more handling on the bash script's ast to reason about loops.

[DavidKorczynski]

Examples:

libtiff, which relies on redirection:

libtiff:

############################################################                                                                                                                                            pushd "$SRC/zlib"                                                                                                                                                                                       
make -j$(nproc) CFLAGS="$CFLAGS -fPIC"                                                                                                                                                                  
make install                                                                                                                                                                                            
popd                                                                                                                                                                                                    
pushd "$SRC/libjpeg-turbo"                                                                                                                                                                              
make -j$(nproc)                                                                                                                                                                                         
make install                                                                                                                                                                                            
popd                                                                                                
pushd "$SRC/jbigkit"                                                                                                                                                                                    
mv "$SRC"/jbigkit/libjbig/*.a "$WORK/lib/"                                                                                                                                                              
mv "$SRC"/jbigkit/libjbig/*.h "$WORK/include/"                                                      
popd                                                                                                                                                                                                    
make -j$(nproc)                                                                                                                                                                                         
make install                                                                                        
mkdir afl_testcases                                                                                                                                                                                     
mkdir tif                                                                                                                                                                                               
find afl_testcases -type f -name '*.tif' -exec mv -n {} tif/ \;                                                                                                                                         
zip -rj tif.zip tif/                                                                                                                                                                                    
cp tif.zip "$OUT/tiff_read_rgba_fuzzer_seed_corpus.zip"                                                                                                                                                 
cp "$SRC/tiff.dict" "$OUT/tiff_read_rgba_fuzzer.dict"                                                                                                                                                   
                                                                                                                                                                                                        
                                                                                                                                                                                                        
############################################################  

htslib:

make -j$(nproc) libhts.a test/fuzz/hts_open_fuzzer.o                                                                                                                                                    
$CXX $CXXFLAGS -o "$OUT/hts_open_fuzzer" test/fuzz/hts_open_fuzzer.o $LIB_FUZZING_ENGINE libhts.a -lz -lbz2 -llzma -lcurl -lcrypto -lpthread       

[oliverchang]

nice!

Can you put this logic into https://github.com/google/oss-fuzz/tree/master/infra/experimental/chronos instead and follow the conventions there? (e.g. /usr/local/bin/recompile) ? that way we can easily build cached images with this at scale with existing machinery.

[DavidKorczynski]

nice!

Can you put this logic into https://github.com/google/oss-fuzz/tree/master/infra/experimental/chronos instead and follow the conventions there? (e.g. /usr/local/bin/recompile) ? that way we can easily build cached images with this at scale with existing machinery.

yeah, It'll need some more work but will move to the dir once it's ready.