How to read a specific data from a yaml file inside a shell script-CodePudding

I have a yaml file say "test.yaml". The below is the content of yaml file.

...
test:
  config:
    abc: name1
    xyz: name2
...

Now I want to read the value of abc and xyz alone from the yaml inside a shell script and store it in two variables inside shell script. test.yaml file contains additional data apart from the above one which I don't need to bother about that inside this shell script.

Eg: test.sh

var1=name1 //test[config[abc]]
var2=name2 //test[config[xyz]]

How do I read specific data (as key-value) from yaml inside a shell script. It would be really helpful if someone helps me out on this. Thanks in advance!!!

CodePudding user response：

Here's an example with yq. All of the following assumes that the values do not contain newlines.

Given

$ cat test.yaml
---
test:
  config:
    abc: name1
    xyz: name2

then

yq e '.test.config | to_entries | map(.value) | .[]' test.yaml

outputs

name1
name2

You can read them into variables like

{ read -r var1; read -r var2; } < <(yq e '.test.config | to_entries | map(.value) | .[]' test.yaml)
declare -p var1 var2

declare -- var1="name1"
declare -- var2="name2"

I would read them into an associative array with the yaml key though:

declare -A conf
while IFS="=" read -r key value; do conf["$key"]=$value; done < <(
    yq e '.test.config | to_entries | map([.key, .value] | join("=")) | .[]' test.yaml
)
declare -p conf

declare -A conf=([abc]="name1" [xyz]="name2" )

Then you can write

echo "test config for abc is ${conf[abc]}"
# or
for var in "${!conf[@]}"; do printf "key %s, value %s\n" "$var" "${conf[$var]}"; done