producing a bash command with awk giving runaway string constant - awk - linux

Question

I'm using awk to parse /etc/hosts and produce a command which will format MapR for me. It's being done in a bash utility in Chef:
egrep '^[0-9]' /etc/hosts | grep -v 127.0.0.1 \
| awk 'NR==1{ips=$1}
NR>1{ips=ips ", " $1}
$2=="namenode"{nn=$1}
END{ printf "/opt/mapr/server/configure.sh -C %s -Z %s -N mycluster --create-user -D /dev/xvdb\n", ips, nn}' \
| bash
sleep 60
The command above should execute the following command:
/opt/mapr/server/configure.sh -C 10.32.237.251 -Z 10.32.237.251 -N mycluster --create-user -D /dev/xvdb
However, looking into my chef output I see:
==> namenode: Executing awk utility
==> namenode: awk: line 1: runaway string constant "/opt/mapr/ ...
The command never got executed in the MapR node... However when i execute it directly on the terminal it works nicely in the way it's supposed to be. What am I doing wrong?
I'm updating the question to show the complete bash script that executes that utility:
DISK_CONFIG=/home/ubuntu/disk_config
if [ -f $DISK_CONFIG ];
then
echo "File already exists"
else
echo "Executing awk utility\n"
touch $DISK_CONFIG
egrep '^[0-9]' /etc/hosts | grep -v 127.0.0.1 \
| awk 'NR==1{ips=$1}
NR>1{ips=ips ", " $1}
$2=="namenode"{nn=$1}
END{ printf "/opt/mapr/server/configure.sh -C %s -Z %s -N mycluster --create-user -D /dev/xvdb\n", ips, nn}' \
| bash
sleep 60
fi

Answer 1

Assuming you're using HEREDOC syntax in your bash resource:
bash "whatever" do
code <<-EOH
DISK_CONFIG=/tmp/disk_config
if [ -f $DISK_CONFIG ];
then
echo "File already exists"
else
echo "Executing awk utility\n"
touch $DISK_CONFIG
egrep '^[0-9]' /etc/hosts | grep -v 127.0.0.1 \
| awk 'NR==1{ips=$1}
NR>1{ips=ips ", " $1}
$2=="namenode"{nn=$1}
END{ printf "/opt/mapr/server/configure.sh -C %s -Z %s -N mycluster --create-user -D /dev/xvdb\n", ips, nn}' \
| bash
fi
EOH
end
this one leads to your error:
Executing awk utility
awk: line 4: runaway string constant "/opt/mapr/ ...
This is due to the \n in your comand (the one into the awk command is likely to be problematic too)
This resource should do (warning I did replace the DISK_CONFIG path for my tests):
bash "whatever" do
code <<-EOH
DISK_CONFIG=/tmp/disk_config
if [ -f $DISK_CONFIG ];
then
echo "File already exists"
else
echo "Executing awk utility"
touch $DISK_CONFIG
egrep '^[0-9]' /etc/hosts | grep -v 127.0.0.1 \
| awk 'NR==1{ips=$1}
NR>1{ips=ips ", " $1}
$2=="namenode"{nn=$1}
END{ printf "/opt/mapr/server/configure.sh -C %s -Z %s -N mycluster --create-user -D /dev/xvdb", ips, nn}' \
| bash
sleep 60
fi
EOH
end
The reason is that Chef already interpret the \n in the code and so awk see a string never ending (runaway).
As you pipe to bash you can omit the \n as the pipe will end the line.