X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=HACKING;h=336fc7c667941e8a78e481f58810872f62e6c083;hp=6ca33be31c7d1692baa2e931f62caecfae3abd90;hb=804330120dcbedc754174fdfdf13cf7577a7eba9;hpb=bdf7a27a790ff26664f91d95239ec33c5467bfeb

diff --git a/HACKING b/HACKING
index 6ca33be..336fc7c 100644
--- a/HACKING
+++ b/HACKING
@@ -91,6 +91,9 @@ src/
 	Source code to the C library.
 	Also contains the crucial generator program.
 
+test-tool/
+	Interactive qemu/kernel test tool.
+
 v2v/
 	Xen to KVM (V2V) conversion tool.
 
@@ -123,3 +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.