fix bugs and add docs

basis/elevate/elevate-docs.factor

@@ -1,12 +1,45 @@
-USING: arrays help.markup help.syntax strings ;
+USING: arrays elevate.private help.markup help.syntax
+io.launcher kernel strings system ;
+
 IN: elevate
 
 ABOUT: elevate
 
-ARTICLE: "elevate" "Cross-platform API for elevated permissions"
-    "Thanks to " { $url "https://github.com/barneygale/elevate" }
+ARTICLE: "elevate" "Elevated permissions API"
+    "Ported from " { $url "https://github.com/barneygale/elevate" "Barney Gale's implementation" } " in Python."
+    { $subsections elevate elevated lowered }
 ;
 
 HELP: elevated
-{ $values { "command" { $or array string } } }
-{ $description } ;
+{ $values { "command" { $or array string } } { "replace?" boolean } { "win-console?" boolean } { "posix-graphical" boolean } }
+{ $description
+    "Spawn a process from the command " { $snippet "command" } " with superuser (administrator) privileges. If the calling process does not already have superuser privileges, it will request them by a number of platform-specific methods."
+    $nl
+    "If " { $snippet "replace?" } " is " { $link t } ", the calling Factor process will be replaced with the command (but see Notes)."
+    $nl
+    "Windows-specific: If " { $snippet "win-console?" } " is " { $link t } ", a new console window will " { $emphasis "always" } " be spawned for the resulting process, regardless of " { $snippet "replace?" } "."
+    $nl
+    "Mac and Linux-specific: If " { $snippet "posix-graphical?" } " is " { $link t } ", a graphical password method will be attempted before " { $snippet "sudo" } "."
+    $nl
+    "If the calling process is already run as superuser, nothing happens. The input command is left on the stack, placed into a "{ $link process } " inside an "{ $link array } "."
+}
+{ $notes
+    { $list
+        { "On Windows, " { $snippet "replace?" } " has the effect of killing (with " { $link exit } ") the calling process after spawning the command because there is no " { $snippet "exec" } " equivalent in Windows." }
+    }
+}
+{ $errors
+    { $link elevated-failed } " when all strategies fail."
+    $nl
+    "Any errors thrown by " { $link run-process } "."
+} ;
+
+HELP: elevate
+{ $values { "win-console?" boolean } { "posix-graphical" boolean } }
+{ $description "Relaunch the current Factor process with superuser privileges. See " { $link elevated } " for an explanation, as the semantics are identical." } ;
+
+HELP: lowered
+{ $description "Give up all superuser rights, returning a process to normal userspace."
+{ $notes "If the process is running as \"real superuser\", (not an impersonation), nothing happens." $nl "If the process is running as an unprivileged user, nothing happens." }
+}
+{ $errors { $link lowered-failed } " when giving up superuser rights failed." } ;

basis/elevate/elevate.factor

@@ -4,7 +4,7 @@ sequences splitting strings system unix.ffi unix.process ;
 IN: elevate
 
 <PRIVATE
-ERROR: elevated-failed path ;
+ERROR: elevated-failed command { strategies array } ;
 ERROR: lowered-failed ;
 
 CONSTANT: apple-script-charmap H{
@@ -29,6 +29,9 @@ CONSTANT: apple-script-charmap H{
 : posix-replace-process ( command-list -- code )
   [ first ] [ rest ] bi exec-with-path ;
 
+: already-root? ( -- ? )
+    getuid geteuid [ zero? ] bi@ or ;
+
 GENERIC: glue-command ( prefix command -- glued )
 
 M: array glue-command
@@ -42,6 +45,10 @@ M: f failed-process? not ;
 M: fixnum failed-process? -1 = ;
 M: process failed-process? status>> zero? not ;
 
+: posix-lowered ( -- )
+    getgid setgid failed-process? [ lowered-failed ] [ ] if
+    getuid setuid failed-process? [ lowered-failed ] [ ] if ;
+
 PRIVATE>
 
 HOOK: elevated os ( command replace? win-console? posix-graphical? -- process )
@@ -52,27 +59,29 @@ M: windows elevated
 
 ! TODO
 M:: macosx elevated ( command replace? win-console? posix-graphical? -- process )
-    posix-graphical? [ ! graphical (through applescript)
-        command apple-script-elevated
-    ] when
-    command replace? win-console? posix-graphical?
-    linux os [ elevated ] with-variable ;
+    already-root? [ <process> command >>command 1array ] [
+        posix-graphical? [ ! graphical (through applescript)
+            command apple-script-elevated
+        ] when
+        command replace? win-console? posix-graphical?
+        linux os [ elevated ] with-variable
+    ] if ;
 
 M:: linux elevated ( command replace? win-console? posix-graphical? -- process )
-    getuid zero? [
-        <process> command >>command ! we are already root: just give a process
+    already-root? [
+        <process> command >>command 1array ! we are already root: just give a process
     ] [
         ! graphical handled
         posix-graphical? ui-running? or "DISPLAY" os-env and
         { "gksudo" "kdesudo" "sudo" } { "sudo" } ?
 
-        command '[ _ glue-command ] map [
+        command '[ _ glue-command ] map :> command-list command-list [
             replace? [
                 " " split posix-replace-process
             ] [ run-process ] if
         ] map
         ! if they all failed, then it failed, but if one passed, that's normal (success)
-        [ [ failed-process? ] all? [ command elevated-failed ] [ ] if ] keep
+        [ [ failed-process? ] all? [ command command-list elevated-failed ] [ ] if ] keep
     ] if ;
 
 : elevate ( win-console? posix-graphical? -- ) [ (command-line) t ] 2dip elevated drop ;
@@ -82,10 +91,9 @@ HOOK: lowered os ( -- )
 ! https://wiki.sei.cmu.edu/confluence/display/c/POS36-C.+Observe+correct+revocation+order+while+relinquishing+privileges
 ! group ID must be lowered before user ID otherwise program may re-gain root!
 M: linux lowered
-    getgid setgid failed-process? [ lowered-failed ] [ ] if
-    getuid setuid failed-process? [ lowered-failed ] [ ] if ;
+    posix-lowered ;
 
 M: macosx lowered
-    linux os [ lowered ] with-variable ;
+    posix-lowered ;
 
 M: windows lowered ;