Cleanup whitespace warnings in Lib.pm

[libguestfs.git] / HACKING

diff --git a/HACKING b/HACKING
index 7a4735c..336fc7c 100644 (file)
--- a/HACKING
+++ b/HACKING
@@ -30,6 +30,9 @@ Directories
 appliance/
        The qemu appliance, build scripts and so on.
 
+cat/
+       The virt-cat tool.
+
 capitests/
        Automated tests of the C API.
 
@@ -88,6 +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.
 
@@ -120,3 +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.