view contrib/plan9/9mail @ 41107:3e2c02836420

transaction: do not overwrite atomic-temp files on error

Even though the original files can be restored from the backup, it should be
better to not write back a temporary file if we know it can be corrupted.

#!/bin/rc
# 9mail - Mercurial email wrapper for upas/marshal

fn usage {
	echo >[1=2] usage: mercurial/9mail -f from to [cc]
	exit usage
}

from=()
cc=()
to=()

switch($1){
case -f
	from=$2
case *
	usage
}

to=($3)
if(~ $#* 4)
	cc=(-C $4)

upasname=$from
upas/marshal $cc $to