CODEWITHSUNDEEP
awksedyq
Devil's Dream
Devil's Dream

Reputation: 715

How to change value in a nested YAML record using yq

I am trying to change the bind_host: localhost to bind_host: 0.0.0.0 where the bind_host is the 3rd layer nested value of YAML file Current value of File

server:
  application_connectors:
  - type: http
    port: 8989
    bind_host: localhost
  request_log:
      appenders: []
  admin_connectors:
  - type: http
    port: 8990
    bind_host: localhost

Expected Output

server:
  application_connectors:
  - type: http
    port: 8989
    bind_host: 0.0.0.0
  request_log:
      appenders: []
  admin_connectors:
  - type: http
    port: 8990
    bind_host: 0.0.0.0

I am trying

awk '
/:$/{
  flag=""
}
/server/{
  flag=1
}
flag && NF && (/bind_host:/){
  match($0,/^[[:space:]]+/);
  val=substr($0,RSTART,RLENGTH);
  $NF="0.0.0.0";
  print val $0;
  next
}
1
'   config.yml

EDIT: Adding image based on answer of @inian enter image description here

Second Image enter image description here

Upvotes: 0

Views: 4119

Answers (2)

Inian
Inian

Reputation: 85530

If you are looking for a kislyuk/yq based solution then use the following snippet. It runs a jq filter to update all the objects inside server that contains bind_host to 0.0.0.0. The -y flag ensures the result object is returned in YAML and not JSON

yq -y '.server |= ( with_entries ( 
                      if   .value[] | select( keys[] | contains("bind_host") ) 
                      then .value[].bind_host = "0.0.0.0" 
                      else empty end
                    )
                  )' yaml

If the modification looks as expected, use the -i flag i.e. yq -yi to save the modifications in-place.

Upvotes: 1

aborruso
aborruso

Reputation: 5678

Running

<input.yaml yq -y '((.server.application_connectors[].bind_host| select(.) ) |= gsub("localhost";"0.0.0.0") )' | \
yq -y '((.server.admin_connectors[].bind_host| select(.) ) |= gsub("localhost";"0.0.0.0") )'

you have

server:
  application_connectors:
    - type: http
      port: 8989
      bind_host: 0.0.0.0
  request_log:
    appenders: []
  admin_connectors:
    - type: http
      port: 8990
      bind_host: 0.0.0.0

Upvotes: 0

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