Control: tags -1 + patch ❦ 3 janvier 2015 23:22 +0100, Vincent Bernat <ber...@debian.org> :
> However, the whole stuff is quite fragile. I can't say for sure if > spaces would do something good or bad, but a star would not work. Here > is an improved version which is easier to understand. I have found a way to be even more concise and don't rely on any "magic" (other that "$@" being the only array in a POSIX shell). Here is a patch. The first change is to let the shell do the splitting of the command in the .desktop file (set -- $(sed ...)). The second change is to use "$@" behaving like an array. We cannot modify this array but we can append to it (with set -- "$@" "$newarg"). Basically, we take $command_exec and then shift. Then, we iterate on each argument using a counter and if the argument needs to be modified (because this is the place holder), we append the modified version, otherwise, we append it unmodified. At the end, "$@" is the array of arguments to be passed to "$command_exec". If no replacement has happened, we also append the target file. No magic quoting is done, no evaluation. I think this is a safe alternative to the current script. I can also push it upstream. Per, I see that you committed to git yesterday. Would you take the patch as is or do you want me to do an NMU?
--- /usr/bin/xdg-open 2015-01-03 22:22:18.513474060 +0100
+++ ./xdg-open 2015-01-08 08:42:47.513093876 +0100
@@ -526,6 +526,7 @@
open_generic_xdg_mime()
{
+ target="$1"
filetype="$2"
default=`xdg-mime query default "$filetype"`
if [ -n "$default" ] ; then
@@ -546,17 +547,34 @@
fi
if [ -r "$file" ] ; then
- command="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | first_word`"
- command_exec=`which $command 2>/dev/null`
- arguments="`grep -E "^Exec(\[[^]=]*])?=" "$file" | cut -d= -f 2- | last_word`"
- local sed_escaped_url="$(echo "$1" | sed -e 's/[&\\]/\\&/g')"
- arguments_exec="$(echo "$arguments" | sed -e 's*%[fFuU]*'"$sed_escaped_url"'*g')"
+ set -- $(sed -n 's/^Exec\(\[[^]]*\]\)\{0,1\}=//p' "$file")
+ command_exec="$(which "$1" 2> /dev/null)"
if [ -x "$command_exec" ] ; then
- if echo $arguments | grep -iq '%[fFuU]' ; then
- eval '$command_exec' '$arguments_exec'
- else
- eval '$command_exec' '$arguments_exec' '"$1"'
- fi
+ shift
+ # We need to replace any occurrence of "%f", "%F" and
+ # the like by the target file. We examine each
+ # argument and append the modified argument to the
+ # end then shift.
+ args=$#
+ replaced=0
+ while [ $args -gt 0 ]; do
+ case $1 in
+ %[fFuU])
+ replaced=1
+ arg="$target"
+ shift
+ set -- "$@" "$arg"
+ ;;
+ *)
+ arg="$1"
+ shift
+ set -- "$@" "$arg"
+ ;;
+ esac
+ args=$(( $args - 1 ))
+ done
+ [ $replaced -eq 1 ] || set -- "$@" "$target"
+ "$command_exec" "$@"
if [ $? -eq 0 ]; then
exit_success
--
Make sure all variables are initialised before use.
- The Elements of Programming Style (Kernighan & Plauger)
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