providers:checkbox: Minor refactoring of gateway_ping_test.

Rewrote the way ping command is invoked and the output is processed to solve a few problems (LP: #1232774). 

1 files changed, 20 insertions, 12 deletions

diff --git a/bin/gateway_ping_test b/bin/gateway_ping_test
index 19d9f2b..da7ed2d 100755
--- a/bin/gateway_ping_test
+++ b/bin/gateway_ping_test
@@ -157,26 +157,34 @@ def get_host_to_ping(interface=None, verbose=False, default=None):
 
 
 def ping(host, interface, count, deadline, verbose=False):
- command = "ping -c %s -w %s %s" % (count, deadline, host)
+
+ command = ["ping", str(host), "-c", str(count), "-w", str(deadline)]
 if interface:
- command = ("ping -I%s -c %s -w %s %s"
- % (interface, count, deadline, host))
+ command.append("-I{}".format(interface))
 
 reg = re.compile(r"(\d+) packets transmitted, (\d+) received, (\d+)% packet loss")
- ping_summary = None
-
- output = os.popen(command)
- for line in output.readlines():
+ ping_summary = {'transmitted': 0, 'received': 0, 'pct_loss': 0}
+
+ try:
+ output = subprocess.check_output(command, universal_newlines=True)
+ except FileNotFoundError as excp:
+ # No ping command present; default exception message is
+ # informative enough.
+ print(excp)
+ except subprocess.CalledProcessError as excp:
+ # Ping returned fail exit code
+ print("ERROR: ping result: {}".format(excp))
+ else:
 if verbose:
- print(line.rstrip())
+ print(output)
 
- received = re.findall(reg, line)
+ received = re.findall(reg, output)
 if received:
 ping_summary = received[0]
 
- ping_summary={'transmitted': int(ping_summary[0]),
- 'received': int(ping_summary[1]),
- 'pct_loss': int(ping_summary[2])}
+ ping_summary={'transmitted': int(ping_summary[0]),
+ 'received': int(ping_summary[1]),
+ 'pct_loss': int(ping_summary[2])}
 return ping_summary