Add `-c, --clear` argument for `log` and `log_distccd` actions to clear log files (#344)

pmb/helpers/frontend.py

@@ -124,12 +124,16 @@ def stats(args):
 
 
 def log(args):
+    if args.clear_log:
+        pmb.helpers.run.user(args, ["truncate", "-s", "0", args.log], log=False)
     pmb.helpers.run.user(args, ["tail", "-f", args.log, "-n", args.lines],
                          log=False)
 
 
 def log_distccd(args):
     logpath = "/home/user/distccd.log"
+    if args.clear_log:
+        pmb.chroot.user(args, ["truncate", "-s", "0", logpath], log=False)
     pmb.chroot.user(args, ["tail", "-f", logpath, "-n", args.lines], log=False)
 
 

pmb/parse/arguments.py

@@ -134,11 +134,10 @@ def arguments():
         "log_distccd",
         help="follow the distccd logfile")
     for action in [log, log_distccd]:
-        action.add_argument(
-            "-n",
-            "--lines",
-            default="30",
-            help="count of initial output lines")
+        action.add_argument("-n", "--lines", default="30",
+                            help="count of initial output lines")
+        action.add_argument("-c", "--clear", help="clear the log",
+                            action="store_true", dest="clear_log")
 
     # Action: zap
     zap = sub.add_parser("zap", help="safely delete chroot folders")