Replace shell_quote function with %Q and %R printf specifiers.

%Q => simple shell quoted string
%R => path will be prefixed by /sysroot

eg. snprintf (cmd, sizeof cmd, "cat %R", path); system (cmd);

1 files changed, 22 insertions, 0 deletions

diff --git a/HACKING b/HACKING
index 42f4f77c..336fc7c6 100644
--- a/HACKING
+++ b/HACKING
@@ -126,3 +126,25 @@ into the appliance.
 
 Debugging messages are never translated, since they are intended for
 the programmers.
+
+Extended printf
+----------------------------------------------------------------------
+
+In the daemon code we have created custom printf formatters %Q and %R,
+which are used to do shell quoting.
+
+%Q => Simple shell quoted string.  Any spaces or other shell characters
+      are escaped for you.
+
+%R => Same as %Q except the string is treated as a path which is prefixed
+      by the sysroot.
+
+eg.
+
+asprintf (&cmd, "cat %R", path);
+==> "cat /sysroot/some\ path\ with\ spaces"
+
+Note: Do NOT use these when you are passing parameters to the
+command{,r,v,rv}() functions.  These parameters do NOT need to be
+quoted because they are not passed via the shell (instead, straight to
+exec).  You probably want to use the sysroot_path() function however.