feat(user/ping_offline.sh):Add timestamps before each ping line

[BK-2020-03.git] / user / ping_offline.sh

diff --git a/user/ping_offline.sh b/user/ping_offline.sh
index df4a22bceb4fd07ea94e3c2f7484c80c3c536daa..4a6339eb843f82aed6c2337245b7cb95879e66d4 100755 (executable)
--- a/user/ping_offline.sh
+++ b/user/ping_offline.sh
@@ -1,17 +1,35 @@
 #!/bin/bash
 # Desc:Marks the time when a remote server can be pinged.
 # Depends: GNU Coreutils 8.32 (date, sleep), iputils-ping 3:20211215-1 (ping)
-# Version: 0.0.2
+# Version: 0.1.0
 
 delay=10;
 domain="google.com"
 
+yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
+die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
+must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
+
 if [[ -n "$1" ]]; then domain="$1"; fi;
 
 SECONDS=0;
 printf "%s:STATUS:Starting ping...\n" "$(date -Is)";
-while ! ping -c1 "$domain"; do
-    sleep "$delay";
+while [[ ! noPing == "true" ]]; do
+    printf "%s:" "$(date -Is)"; # prepend line with date
+    ping -c1 "$domain"; pingExitCode="$?"; # perform ping
+    
+    if [[ "$pingExitCode" -eq 0 ]]; then
+        # Case if ping succeeded
+        printf "%s:Ping resolved after $SECONDS seconds.\n" "$(date -Is)";
+        exit 0;
+    elif [[ "$pingExitCode" -eq 1 ]]; then
+        sleep "$delay";
+        continue;
+    else
+        die "FATAL:Unknown error.";
+        exit 1;
+    fi;
 done;
-printf "%s:Ping resolved after $SECONDS seconds.\n" "$(date -Is)";
-exit 0;
+
+yell "ERROR:Here be dragons.";
+exit 1;