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|
#!/bin/sh
set -euo pipefail
usage() {
cat <<-'EOF'
Usage:
ifok [-o OUTFILE] COMMAND...
EOF
}
OUTFILE='/dev/stdout'
while getopts 'o:' flag; do
case "$flag" in
(o)
OUTFILE="$OPTARG"
;;
(*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
if [ -w "$(dirname -- "$OUTFILE")" ]; then
TEMPFILE="$OUTFILE.$(uuid).tmp"
else
TEMPFILE="$(mkstemp)"
fi
trap 'rm -f "$TEMPFILE"' EXIT
STATUS=0
"$@" > "$TEMPFILE" || STATUS=$?
if [ "$STATUS" = 0 ]; then
mv "$TEMPFILE" "$OUTFILE" 2>/dev/null || cp "$TEMPFILE" "$OUTFILE"
fi
exit "$STATUS"
|
