linux-kernel - [RESEND PATCH] tools/power/x86/intel_pstate

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Date:   Sun, 16 Apr 2017 08:17:14 -0700
From:   Doug Smythies <doug.smythies@...il.com>
To:     srinivas.pandruvada@...ux.intel.com, rjw@...ysocki.net,
        len.brown@...el.com
Cc:     dsmythies@...us.net, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [RESEND PATCH] tools/power/x86/intel_pstate_tracer: Adjust directory permissions

Depending on what is being done, the intel_pstate_tracer.py script
needs to be run as root, or can be run as a regular user.
If run the first time as root the results directory will be
incorrect for any subsequent run as a regular user. For any run
as root the specific testname subdirectory will not allow any
subsequent file saves by a regular user. Typically, and for example,
the regular user might be attempting to save a .csv file converted to
a spreadsheet with added calculations or graphs.

Override the default folder permissions.

Signed-off-by: Doug Smythies <dsmythies@...us.net>
---
 tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
index fd706ac..7c855508 100755
--- a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
+++ b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
@@ -517,13 +517,19 @@ else:
         cpu_mask[i] = 1
 
 if not os.path.exists('results'):
+    # Setting permissions with the mode option doesn't work on all platforms
     os.mkdir('results')
+    # so use chmod to set them. Needed because user may or may not be root.
+    os.chmod('results', 0777)
 
 os.chdir('results')
 if os.path.exists(testname):
     print('The test name directory already exists. Please provide a unique test name. Test re-run not supported, yet.')
     sys.exit()
+# Setting permissions with the mode option doesn't work on all platforms
 os.mkdir(testname)
+os.chmod(testname, 0777)
+# so use chmod to set them. Needed because user may or may not be root.
 os.chdir(testname)
 
 # Temporary (or perhaps not)
-- 
2.7.4