dotnet-install.sh fails to install SDK on Alpine Linux

[natemcmaster]

Steps to reproduce

FROM microsoft/dotnet:2.1-runtime-deps-alpine
WORKDIR /code/build

RUN apk add --no-cache \
        bash \
        wget \
        curl \
        icu-libs \
        openssl

RUN wget https://raw.githubusercontent.com/dotnet/cli/release/2.1.3xx/scripts/obtain/dotnet-install.sh \
    && chmod +x dotnet-install.sh \
    && ./dotnet-install.sh --version 2.1.300-preview2-008251

docker build . -t test

Expected behavior

Download and extract https://dotnetcli.blob.core.windows.net/dotnet/Sdk/2.1.300-preview2-008251/dotnet-sdk-2.1.300-preview2-008251-alpine.3.6-x64.tar.gz

Actual behavior

# ./dotnet-install.sh --version 2.1.300-preview2-008251
dotnet_install: Error: Unable to locate libunwind. Install libunwind to continue
dotnet_install: Error: Unable to locate libssl. Install libssl to continue
dotnet_install: Error: Unable to locate libicu. Install libicu to continue
dotnet_install: Error: Unable to locate libcurl. Install libcurl to continue

You can disable pre-req check..

export DOTNET_INSTALL_SKIP_PREREQS=1

but then this fails because cp -n is not supported in Alpine

cp: unrecognized option: n

@natemcmaster
Please use 'https://dot.net/v1/dotnet-install.sh' it is the only supported version.

I do not see a "cp -n" in the script. I've checked master, release/2.1.3xx, & the supported version at: 'https://dot.net/v1/dotnet-install.sh'

There is a "cp -R": cp -R $override_switch "$root_path/$path" "$target"
is this what you mean?

[natemcmaster]

Please use 'https://dot.net/v1/dotnet-install.sh' it is the only supported version.

Can we update it to include this as well then? dotnet/cli#8314 tput doesn't exist in alpine either.

The -n comes from the value of $override_switch

https://github.com/dotnet/cli/blob/495630fe9782ae70db2547b2474ba332352cfd1d/scripts/obtain/dotnet-install.sh#L573-L580

[livarcocc]

Yes, that should be feasible. @johnbeisner can you work to make sure the change is in the right branch, at which point we should be able to push it.

closing: Alpine fix; plus 1 dotnet/cli#8821

The original cp: unrecognized option: n error reported in this issue is still present in release/2.1.3xx branch.