[SOLVED] how to use a shell variable inside another eval block

Issue

I want to evaluate a variable conditionally for use in my docker image build

RUN ARCHFLAG="$(uname -m)" && ARCH=$([ $ARCHFLAG == "aarch64" ] &&  echo "arm64" ||  echo $ARCHFLAG) && curl -sL "https://get.helm.sh/helm-v${HELM_VERSION}-linux-${ARCH}.tar.gz" | tar -xvz && \
    mv linux-${ARCH}/helm /usr/bin/helm && \
    chmod +x /usr/bin/helm && \
    rm -rf linux-${ARCH}

I get the error

------
 > [ 5/13] RUN ARCHFLAG="$(uname -m)" && ARCH=$([ ARCHFLAG == "aarch64"] &&  echo "arm64" ||  echo $ARCHFLAG) && curl -sL "https://get.helm.sh/helm-v3.6.3-linux-${ARCH}.tar.gz" | tar -xvz &&     mv linux-${ARCH}/helm /usr/bin/helm &&     chmod +x /usr/bin/helm &&     rm -rf linux-${ARCH}:
#8 0.248 /bin/sh: 1: [: aarch64: unexpected operator
#8 1.295
#8 1.295 gzip: stdin: not in gzip format
#8 1.296 tar: Child returned status 1
#8 1.296 tar: Error is not recoverable: exiting now

I've enclosing it as a string too, in the IDE the first $ARCHFLAG shows up in the same colours as rest of the strings while the second $ARXCHFLAG does show up as variable.

Solution

You are using [ $ARCHFLAG == "aarch64" ]. This would work in bash, or in a "halfway POSIX shell" (for instance, a bash which is started in POSIX mode and implements the == operator), but in a POSIX shell, you would get _ unexpected operator_. From the error message you posted, we see that you are not executing bash. I suggest that you either switch to bash, or write the test as [ "$ARCHFLAG" = "aarch64" ].

Answered By - user1934428

Answer Checked By - Cary Denson (WPSolving Admin)