Git actions branch - bash

Question

So I have two secrets: DEV_SERVER_IP and MASTER_SERVER_IP.
in main.yml I need something like this
run: echo "::set-env name=BRANCH_NAME::$(echo ${GITHUB_REF#refs/heads/} | sed 's/\//_/g')"
run: ssh-keyscan -H ${{ secrets.BRANCH_NAME_SERVER_IP }} >> ~/.ssh/known_hosts
but am getting error
env:
BRANCH_NAME: dev
Error: Input required and not supplied: key
I need here something like this ssh-keyscan -H ${{ secrets.${BRANCH_NAME}_SERVER_IP }}
how can I fix this?

Answer 1

You're trying to use shell style logic inside a Github context
expansion (${{ ... }}) which won't work. Just move all your logic
into your shell script instead:
name: Example
on:
push:
jobs:
example:
runs-on: ubuntu-latest
steps:
- name: get target ip
env:
DEV_SERVER_IP: ${{ secrets.DEV_SERVER_IP }}
MAIN_SERVER_IP: ${{ secrets.MAIN_SERVER_IP }}
run: |
branch_name=$(sed 's|/|_|g' <<< ${GITHUB_REF#refs/heads/})
target="${branch_name^^}_SERVER_IP"
mkdir -p ~/.ssh
ssh-keyscan -H ${!target} >> ~/.ssh/known_hosts
cat ~/.ssh/known_hosts
In the above workflow, the expression ${branch_name^^} is a bash expression that returns the value of $branch_name in uppercase, and ${!target} is a bash expression that returns the value of the variable who name is stored in $target.
Note that I'm not using your "set the BRANCH_NAME environment variable"
task because the ::set-env command is disabled by default for
security reasons.