1 files changed, 16 insertions, 0 deletions
diff --git a/lib/default.nix b/lib/default.nix
index 7197fe9..3ebefdc 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -34,6 +34,12 @@ let {
       if lib.length y != 1 then throw "malformed /etc/hostname" else
       lib.elemAt y 0;
 
+    isLocalTarget = let
+      origin = lib.mkTarget "";
+    in target:
+      target.user == origin.user &&
+      lib.elem target.host [origin.host "localhost"];
+
     mkTarget = s: let
       default = defVal: val: if val != null then val else defVal;
       parse = lib.match "(([^@]+)@)?(([^:/]+))?(:([^/]+))?(/.*)?" s;
@@ -45,6 +51,16 @@ let {
       path = default "/var/src" /* no default? */ (elemAt' parse 6);
     };
 
+    shell = let
+      isSafeChar = lib.testString "[-+./0-9:=A-Z_a-z]";
+      quoteChar = c:
+        if isSafeChar c then c
+        else if c == "\n" then "'\n'"
+        else "\\${c}";
+    in {
+      quote = x: if x == "" then "''" else lib.stringAsChars quoteChar x;
+    };
+
     test = re: x: lib.isString x && lib.testString re x;
     testString = re: x: lib.match re x != null;