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check-generated-files.sh -u: don't update file timestamps
When running check-generated-files in update mode, all generated files were regenerated. As a consequence, ``` tests/scripts/check-generated-files.sh -u && make ``` always caused most of the code to be rebuilt. Now, if a file hasn't changed, preserve its original modification time (and other metadata), so the command above doesn't rebuild anything that has actually not changed. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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@ -65,24 +65,25 @@ check()
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fi
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for FILE in "$@"; do
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cp "$FILE" "$FILE.bak"
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cp -p "$FILE" "$FILE.bak"
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done
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"$SCRIPT"
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# Compare the script output to the old files and remove backups
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for FILE in "$@"; do
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if ! diff "$FILE" "$FILE.bak" >/dev/null 2>&1; then
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if diff "$FILE" "$FILE.bak" >/dev/null 2>&1; then
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# Move the original file back so that $FILE's timestamp doesn't
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# change (avoids spurious rebuilds with make).
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mv "$FILE.bak" "$FILE"
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else
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echo "'$FILE' was either modified or deleted by '$SCRIPT'"
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if [ -z "$UPDATE" ]; then
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exit 1
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else
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rm "$FILE.bak"
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fi
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fi
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if [ -z "$UPDATE" ]; then
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mv "$FILE.bak" "$FILE"
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else
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rm "$FILE.bak"
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fi
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done
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if [ -n "$directory" ]; then
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