conan: [bug] activate.sh/deactivate.sh does not work in cygwin

Environment Details (include every applicable attribute)

• Operating System+version: Windows 10 Enterprise Ver 10.0 Build 17763
• Conan version: 1.22.2
• Python version: 3.7.6
• Cygwin DLL version info: DLL version: 3.0.7 DLL epoch: 19 DLL old termios: 5 DLL malloc env: 28 Cygwin conv: 181 API major: 0 API minor: 338 Shared data: 5 DLL identifier: cygwin1 Mount registry: 3 Cygwin registry name: Cygwin Installations name: Installations Cygdrive default prefix: Build date: Shared id: cygwin1S5

Steps to reproduce

• Open cygwin
• Create an empty directory
• In that directory I’ve created a conanfile.txt with the following content (the package is a simple helloworld.exe to check if the PATH is properly set):

  [build_requires]
  helloworld/1.0.0@conti_gen_dev1/testing
  
  [generators]
  virtualenv
  

• Run conan install .
• This will generate the following files which might be used in cygwin:
  • activate.sh:

    #!/usr/bin/env sh
    export CONAN_OLD_PATH="$PATH"
    
    while read -r line; do
        LINE="$(eval echo $line)";
        export "$LINE";
    done < "D:\casdev\_test\conan_poc\conan_test_shell\environment.sh.env"
    
    export CONAN_OLD_PS1="$PS1"
    export PS1="(conanenv) $PS1"
    

  • deactivate.sh:

    !/usr/bin/env sh
    export PS1="$CONAN_OLD_PS1"
    unset CONAN_OLD_PS1
    
    
    export PATH="$CONAN_OLD_PATH"
    unset CONAN_OLD_PATH
    

  • environment.sh.env:

    PATH="D:\.conan\614de7\1\bin"${PATH+:$PATH}
    

• Now in Cygwin when calling source activate.sh the following errors are displayed:

  -bash: $'\r': command not found
  -bash: activate.sh: line 7: syntax error near unexpected token `done'
  'bash: activate.sh: line 7: `done < "D:\casdev\_test\conan_poc\conan_test_shell\environment.sh.env"
  

• Similar problem exists for source deactivate.sh

Notes

• If I call source activate.sh in a Git Bash then it works fine, so it seems to be a problem only for cygwin
• If I modify the line endings in activate.sh and deactivate.sh from CR LF to LF then it also works in cygwin
• See also issue #2568

Proposal

• activate.sh and deactivate.sh should always use LF as line endings independent of the OS
• This should work in Git Bash, cygwin, Linux