From 7a778b2393dce330ba5b4828a1a02b66a3629648 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rn=20Hees?= <joernhees@users.noreply.github.com>
Date: Fri, 18 Nov 2016 09:28:34 +0100
Subject: [PATCH] :bug: :racehorse: fix concurrency in init code, fixes #163

caches and prefers existing .junest/etc/passwd and group files

before this fix it was possible that concurrent startup (as in multiple junest processes)
lead to partial files for some of the junest processes.
---
 lib/core.sh | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/lib/core.sh b/lib/core.sh
index dc29c34..d901b45 100644
--- a/lib/core.sh
+++ b/lib/core.sh
@@ -420,15 +420,19 @@ function _provide_bindings_as_user(){
 #  None
 #######################################
 function _build_passwd_and_group(){
-    if ! getent_cmd passwd > ${JUNEST_HOME}/etc/junest/passwd
-    then
-        warn "getent command failed or does not exist. Binding directly from /etc/passwd."
-        cp_cmd /etc/passwd ${JUNEST_HOME}/etc/junest/passwd
+    if [ ! -f ${JUNEST_HOME}/etc/junest/passwd ] ; then
+        if ! getent_cmd passwd > ${JUNEST_HOME}/etc/junest/passwd
+        then
+            warn "getent command failed or does not exist. Binding directly from /etc/passwd."
+            cp_cmd /etc/passwd ${JUNEST_HOME}/etc/junest/passwd
+        fi
     fi
-    if ! getent_cmd group > ${JUNEST_HOME}/etc/junest/group
-    then
-        warn "getent command failed or does not exist. Binding directly from /etc/group."
-        cp_cmd /etc/group ${JUNEST_HOME}/etc/junest/group
+    if [ ! -f ${JUNEST_HOME}/etc/junest/group ] ; then
+        if ! getent_cmd group > ${JUNEST_HOME}/etc/junest/group
+        then
+            warn "getent command failed or does not exist. Binding directly from /etc/group."
+            cp_cmd /etc/group ${JUNEST_HOME}/etc/junest/group
+        fi
     fi
 }