blob: a6485e79a9eefc81cc93a71878655df0cc7d1409 (
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#!/bin/sh
set -e
if [ "$#" -lt "2" ]; then
echo "USAGE: $0 <file> <cmd...>"
exit 1
fi
DST_FILE="$1"
shift
# Just in case:
mkdir -p -- "$(dirname -- "${DST_FILE}")"
cleanup()
{
rm -f -- "${DST_FILE}.tmp"
}
trap cleanup 0 1 2 3 6
"$@" > "${DST_FILE}.tmp"
# If we get here, the command was successful, and we can overwrite the destination.
if ! cmp --quiet -- "${DST_FILE}.tmp" "${DST_FILE}"; then
# File changed, need to overwrite:
mv -f -- "${DST_FILE}.tmp" "${DST_FILE}"
fi
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