[rrd-developers] [PATCH] rrdcached (and client) updates to improve path handling

[kevin brintnall]

This series of 3 patches improves handling of path names within the daemon
and the client code.  It permits files to be referred to by any valid
name, preserving the principle of least surprise.

Prior to this update, rrdcached clients had to refer to a file
consistently by the same name.  In other words, the daemon would treat
these as two completely different files:

    rrdtool update /dir/x.rrd N:1:2:3
    cd /dir ; rrdtool update x.rrd N:1:2:3

To improve performance, absolute paths are not resolved.  The daemon is
enhanced to make this assumption safe.