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[PATCH] Improve _su
I was looking at _su for workers/45410 and noticed a few things:
* Fetching the user's shell often doesn't work on macOS, because normal users
don't appear in passwd; we can use Directory Service for this
* We try to use -s to set the shell even for implementations that don't
support that; we should skip those
* For the getent passwd case, we weren't escaping the user name before passing
it to eval
* For the non-getent passwd case, we were doing a prefix match on the user
name (i don't think that was intended?)
dana
diff --git a/Completion/Unix/Command/_su b/Completion/Unix/Command/_su
index 900905632..ea0beab94 100644
--- a/Completion/Unix/Command/_su
+++ b/Completion/Unix/Command/_su
@@ -58,12 +58,22 @@ fi
_arguments $args ${(e)first} "*:shell arguments:= ->rest" && return
usr=${line[norm]/--/root}
-if (( $#opt_args[(i)-(s|-shell)] )); then
+
+# Normal users generally don't appear in passwd on macOS; try the Directory
+# Service first
+if [[ $OSTYPE == darwin* ]] && (( $+commands[dscl] )); then
+ shell=${"$(
+ _call_program shells dscl . -read /Users/${(q)usr} UserShell
+ )"#UserShell: }
+fi
+
+[[ -z $shell ]] &&
+if (( ${#${(@M)args:#*-s\[*\]:*}} && $#opt_args[(i)-(s|-shell)] )); then
shell=${(v)opt_args[(i)-(s|-shell)]}
elif (( ${+commands[getent]} )); then
- shell="${$(_call_program shells getent passwd $usr)##*:}"
+ shell="${$(_call_program shells getent passwd ${(q)usr})##*:}"
else
- shell="${${(M@)${(@f)$(</etc/passwd)}:#$usr*}##*:}"
+ shell="${${(M@)${(@f)$(</etc/passwd)}:#${usr}:*}##*:}"
fi
case $state in
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