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scripts/kvm/kvm_stat: Improve debugfs access checking 

Access checking with F_OK was replaced with the better readable
os.path.exists().

On Linux exists() returns False when the user doesn't have sufficient
permissions for statting the directory. Therefore the error message
now states that sufficient rights are needed when the check fails.

Also added check for /sys/kernel/debug/tracing/.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1452525484-32309-9-git-send-email-frankja@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Janosch Frank 2016-01-11 16:17:38 +01:00 committed by Paolo Bonzini
parent 6fbff649d7
commit 7aa4ee5a60
1 changed files with 11 additions and 5 deletions
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16
scripts/kvm/kvm_stat
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@ -473,12 +473,18 @@ class Stats:
self.values[key] = (newval, newdelta)
return self.values
if not os.access('/sys/kernel/debug', os.F_OK):
print 'Please enable CONFIG_DEBUG_FS in your kernel'
if not os.path.exists('/sys/kernel/debug'):
sys.stderr.write('Please enable CONFIG_DEBUG_FS in your kernel.')
sys.exit(1)
if not os.access(PATH_DEBUGFS_KVM, os.F_OK):
print "Please mount debugfs ('mount -t debugfs debugfs /sys/kernel/debug')"
print "and ensure the kvm modules are loaded"
if not os.path.exists(PATH_DEBUGFS_KVM):
sys.stderr.write("Please make sure, that debugfs is mounted and "
"readable by the current user:\n"
"('mount -t debugfs debugfs /sys/kernel/debug')\n"
"Also ensure, that the kvm modules are loaded.\n")
sys.exit(1)
if not os.path.exists(PATH_DEBUGFS_TRACING):
sys.stderr.write("Please make {0} readable by the current user.\n"
.format(PATH_DEBUGFS_TRACING))
sys.exit(1)
LABEL_WIDTH = 40