Fix update of /etc/hosts files for clusters deployed in VPC without internet access.

Author: francesco-giordano

CHANGELOG.md

@@ -3,7 +3,13 @@ aws-parallelcluster-cookbook CHANGELOG
 
 This file is used to list changes made in each version of the AWS ParallelCluster cookbook.
 
-3.1.1
+3.1.2
+------
+
+**BUG FIXES**
+- Fix update of `/etc/hosts` files for clusters deployed in VPC without internet access. 
+
+3.1.0
 ------
 
 **ENHANCEMENTS**

cookbooks/aws-parallelcluster-slurm/files/default/head_node_slurm/prolog

@@ -36,8 +36,8 @@ _log() {
 _log "Adding nodes to /etc/hosts"
 # SLURM_NODE_ALIASES has value like "queue-0-dy-compute-resource-0-1:[192.168.1.2]:ip-192-168-1-2"
 # The following line transforms this line to "192.168.1.2 queue-0-dy-compute-resource ip-192-168-1-2"
-hosts=$(echo "${SLURM_NODE_ALIASES}" | awk 'BEGIN{RS=","; FS=":"}; {gsub(/\[|\]/,"",$2); print $2,$1,$3}')
-lines='#HOSTS_JOB_'"${SLURM_JOB_ID}\n${hosts}\n"'#END_JOB_'"${SLURM_JOB_ID}"
+hosts=$(echo -n "${SLURM_NODE_ALIASES}" | awk 'BEGIN{RS=","; FS=":";ORS="\\n"}; {gsub(/\[|\]/,"",$2); print $2,$1,$3}' )
+lines='#HOSTS_JOB_'"${SLURM_JOB_ID}\n${hosts}"'#END_JOB_'"${SLURM_JOB_ID}"
 if grep -q '^#HOSTS_JOB_.*' /etc/hosts
 then
     # If there is other nodes information in the file, the newest nodes information is inserted before the older ones.