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#!/bin/sh
# Transparently wrap scp(1) targets on the command line
self=swr
# Create a temporary directory with name in $td, and handle POSIX-ish traps to
# remove it when the script exits.
td=
cleanup() {
[ -n "$td" ] && rm -fr -- "$td"
if [ "$1" != EXIT ] ; then
trap - "$1"
kill "-$1" "$$"
fi
}
for sig in EXIT HUP INT TERM ; do
# shellcheck disable=SC2064
trap "cleanup $sig" "$sig"
done
td=$(mktd "$self") || exit
# Set a flag to manage resetting the positional parameters at the start of the
# loop
n=1
for arg ; do
# If this is our first iteration, reset the shell parameters
case $n in
1) set -- ;;
esac
# Test whether this argument looks like a remote file
if (
# Test it contains a colon
case $arg in
*:*) ;;
*) exit 1 ;;
esac
# Test the part before the first colon has at least one character and
# only hostname characters
case ${arg%%:*} in
'') exit 1 ;;
*[!a-zA-Z0-9-.]*) exit 1 ;;
esac
) ; then
# Looks like a remote file request; try to copy it into the temporary
# directory, bail out completely if we can't
dst=$td/$n
scp -q -- "$arg" "$dst" || exit
set -- "$@" "$dst"
else
# Just a plain old argument; stack it up
set -- "$@" "$arg"
fi
# Bump n
n=$((n+1))
done
# Run the command with the processed arguments
exec "$@"
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