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Use Python for sccache hit rate computation. #2474

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Oct 21, 2024
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Use Python for sccache hit rate computation. #2474

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4 changes: 2 additions & 2 deletions build.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -463,14 +463,14 @@ if (( ${NUMARGS} == 0 )) || hasArg libraft || hasArg docs || hasArg tests || has
if [[ ${CACHE_TOOL} == "sccache" && -x "$(command -v sccache)" ]]; then
COMPILE_REQUESTS=$(sccache -s | grep "Compile requests \+ [0-9]\+$" | awk '{ print $NF }')
CACHE_HITS=$(sccache -s | grep "Cache hits \+ [0-9]\+$" | awk '{ print $NF }')
HIT_RATE=$(echo - | awk "{printf \"%.2f\n\", $CACHE_HITS / $COMPILE_REQUESTS * 100}")
HIT_RATE=$(python3 -c "print(f'{${CACHE_HITS} / ${COMPILE_REQUESTS}:.2f}' if ${COMPILE_REQUESTS} else 'nan')")
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For situations like this, I prefer to pass variables in as arguments, environment variables, etc. to avoid the risk of code injection. It's admittedly not a big deal in this particular situation, but I still prefer to do it.

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HIT_RATE=$(python3 -c "print(f'{${CACHE_HITS} / ${COMPILE_REQUESTS}:.2f}' if ${COMPILE_REQUESTS} else 'nan')")
HIT_RATE=$(COMPILE_REQUESTS="${COMPILE_REQUESTS}" CACHE_HITS="${CACHE_HITS}" python3 -c "import os; print(f'{int(os.getenv(\"CACHE_HITS\")) / int(os.getenv(\"COMPILE_REQUESTS\")):.2f}' if int(os.getenv(\"COMPILE_REQUESTS\")) else 'nan')")

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Follow-up PRs:

MSG="${MSG}<br/>cache hit rate ${HIT_RATE} %"
elif [[ ${CACHE_TOOL} == "ccache" && -x "$(command -v ccache)" ]]; then
CACHE_STATS_LINE=$(ccache -s | grep "Hits: \+ [0-9]\+ / [0-9]\+" | tail -n1)
if [[ ! -z "$CACHE_STATS_LINE" ]]; then
CACHE_HITS=$(echo "$CACHE_STATS_LINE" - | awk '{ print $2 }')
COMPILE_REQUESTS=$(echo "$CACHE_STATS_LINE" - | awk '{ print $4 }')
HIT_RATE=$(echo - | awk "{printf \"%.2f\n\", $CACHE_HITS / $COMPILE_REQUESTS * 100}")
HIT_RATE=$(python3 -c "print(f'{${CACHE_HITS} / ${COMPILE_REQUESTS}:.2f}' if ${COMPILE_REQUESTS} else 'nan')")
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MSG="${MSG}<br/>cache hit rate ${HIT_RATE} %"
fi
fi
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