trace-cmd: Load trace-cmd plugins from build folder, if exists
When a development version of trace-cmd is built and run on the machine,
by default it loads all plugins from predefined drierctories :
(install_preffix)/lib/traceevent/plugins
~/.traceevent/plugins
the path specified in TRACEEVENT_PLUGIN_DIR environment variable.
Thus, the development plugins will not be loaded. To simplify the development
process, a new logic is added:
At plugins load time, check the location of trace-cmd application and look
for "plugins" directory around it. If found, load plugins from it. Those
pluigins will be loaded last, so in case of duplication the "development"
plugins win.
Link: http://lore.kernel.org/linux-trace-devel/20190423143344.30645-1-tstoyanov@vmware.com
Reviewed-by: Slavomir Kaslev <kaslevs@vmware.com>
Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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