Merge pull request #425 from veblush/sudo

Better sudo script

imagefiles/install-gosu-binary-wrapper.sh

@@ -13,13 +13,44 @@ gosu nobody true
 
 # To ensure that our custom sudo wrapper is not
 # overwritten by a future re-install of sudo, it
-# is created in /usr/loca/bin
+# is created in /usr/local/bin
 
 cat << EOF >> /usr/local/bin/sudo
 #!/bin/sh
 # Emulate the sudo command
-exec gosu root:root "\$@"
+SUDO_USER=root
+SUDO_GROUP=root
+while (( "\$#" )); do
+  case "\$1" in
+    # user option
+    -u)
+      SUDO_USER=\$2
+      shift 2
+      ;;
+    # group option
+    -g)
+      SUDO_GROUP=\$2
+      shift 2
+      ;;
+    # skipping arguments without values
+    -A|-b|-E|-e|-H|-h|-K|-n|-P|-S|-V|-v)
+      shift 1
+      ;;
+    # skipping arguments with values
+    -a|-C|-c|-D|-i|-k|-l|-ll|-p|-r|-s|-t|-U)
+      shift 2
+      ;;
+    # stop processing command line arguments
+    --)
+      shift 1
+      break
+      ;;
+    *)
+      break
+      ;;
+  esac
+done
+exec gosu \$SUDO_USER:\$SUDO_GROUP "\$@"
 EOF
 
 chmod +x /usr/local/bin/sudo
-