sysmgr

commit ae6c6fcc17786e2689906c9dad47bd91403eb3ba
parent 8f94a2c852f4134d593d64d1b1a09db1d131649a
Author: Cem Keylan <cem@ckyln.com>
Date:   Tue, 25 Feb 2020 23:23:17 +0300

add a function for checking processes

Diffstat:
M
sysmgr
 | 
18
+++++++++++++++++-

1 file changed, 17 insertions(+), 1 deletion(-)
diff --git a/sysmgr b/sysmgr
@@ -23,6 +23,15 @@ die()   { printf 'error: %s\n' "$@" "exiting..." >&2 ; exit 1 ;}
 RUNDIR="${RUNDIR:-/run/sysmgr}"
 SYSDIR="${SYSDIR:-/var/sysmgr}"
 
+checkprocess() {
+    [ -d /proc ] || {
+        kill -0 "$1" || return 1
+        return 0
+    }
+    [ -d "/proc/$1" ] || return 1
+    return 0
+}
+
 cleanup() {
 
     # Clean the service run directory so that it can be
@@ -144,7 +153,7 @@ fn_runsyssv() {
     done
 
     # check whether services are alive
-    while kill -0 "$svpid" >/dev/null 2>&1 ; do sleep 1 ; done
+    while checkprocess "$svpid" ; do sleep 1 ; done
 
     # Do a cleanup when the service is killed
     cleanup
@@ -159,6 +168,13 @@ fn_svctl() {
     }
     [ -d "${RUNDIR:?}/$2" ] || die "service $2 could not be found."
     case "$1" in
+        stat|status)
+            # The usage of && || is for 'if else', but since 'out' will
+            # always return 0, this usage is okay.
+            # shellcheck disable=SC2015
+            checkprocess "$(cat "${RUNDIR:?}/$2/pid")" &&
+                out "OK" || { out "DOWN" ; exit 1 ;}
+            ;;
         restart)
             fn_svctl kill "$2"
             fn_svctl start "$2"