How do i resolve this ambiguous Azure error?

Question

I am using run commands to execute bash scripts via the Azure CLI bash scripts in RHEL 7 VM.

I am getting an error when there is a snippet of the run command:

   az vm run-command invoke --name ${THIS_VM_NAME} \
            --command-id RunShellScript \
            --resource-group ${RSC_GRP_NAME} \
            --query "output[].message | join('\n\n', @)" \
            --scripts "
cat > /etc/init.d/parity <<'EOF'
${INIT_D_PARITY}
exit 0
EOF

chmod +x /etc/init.d/parity

service parity restart

sleep 5

ls -la /var/log/parity.err
ls -la /var/log/parity.log
ls -la /var/log/parity.node.log

echo '_____________________________________________'
echo 'Parity Error Log:'
tail -n 5 /var/log/parity.err
echo '_____________________________________________'

ls -la /usr/libs/libssl*

parity -v

cat /var/log/parity.node.log | grep -oEi '(enode.*@)' | tail -n 1 | sed 's/enode:\/\///' | sed 's/@.*//' > /etc/parity/enode.pub

ls -la /etc/init.d/parity
ls -la /etc/parity/enode.pub

cat /etc/parity/enode.pub
echo 'Parity is Up an running \o/'
"

Here is the error message:

In function join(), invalid type for value: None, expected one of: ['array-string'], received: "null" Traceback (most recent call last):

Run bash only with `join('\n\n', @)` and check what values should be there and what value contains `@` here. — Justinas, Sep 03 '18 at 07:11
That `cat | grep | awk | sed` pipeline should probably be refactored. See [useless use of `grep`](http://www.iki.fi/era/unix/award.html#grep) — tripleee, Sep 05 '18 at 07:44
@CharlesXu-MSFT the new version of the cli uses `value` not output. This is what was breaking it — 0xsegfault, Sep 07 '18 at 08:07
@Data_Kid If you mean the command should be `value[].message | join('\n\n', @)`? — Charles Xu, Sep 07 '18 at 08:09

score 0 · Answer 1 · edited Sep 05 '18 at 15:12

The join() is a function of JMESPath that a query language for JSON. Here is an easy example:

Array:

{
  "locations": [
    {"name": "Seattle", "state": "WA"},
    {"name": "New York", "state": "NY"},
    {"name": "Bellevue", "state": "WA"},
    {"name": "Olympia", "state": "WA"}
  ]
}

Query code:

locations[?state == 'WA'].name | sort(@) | {WashingtonCities: join(', ', @)}

Result:

{
  "WashingtonCities": "Bellevue, Olympia, Seattle"
}

For your issue, you can get the details from this link. I think if the output is an array then the function join() will work well. If not, the error as same as you got will come.

How do i resolve this ambiguous Azure error?

1 Answers1