Re: [libvirt] [PATCH] travis: force install of python2 into $PATH on macOS

The homebrew formula's ignored Python PEP-0394 recommendations and changed the plain python binary in /usr/local/bin to point to Python 3 instead of Python 2. Python 2 is not even installed into a location that is in $PATH by default anymore. The homebrew packages print a message to stderr claiming to provide a way to fix this [quote] This formula installs a python2 executable to /usr/local/opt/python@2/bin If you wish to have this formula's python executable in your PATH then add the following to ~/.bash_profile: export PATH="/usr/local/opt/python@2/libexec/bin:$PATH" [/quote] When trying to update $PATH are suggested we find out this message is a lie and /usr/local/opt/python@2 does not even exist, instead Python seems to end up in /usr/local/Cellar/python(a)2/2.7.14_1 Rather than hardcoding this version specific directory in our travis config, we change to run "brew link --force python@2", to make it create symlinks in /usr/local/bin for the python2 binary. The original change triggering this problem was https://github.com/Homebrew/homebrew-core/pull/24604#issue-171653084 There are countless bug reports against homebrew-core that are closed without fixes, so it seems they are determined to ignore the Python PEP 0394 recommendations on this.

before_install: - - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew update && brew upgrade && brew install rpcgen yajl xz; fi + - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew update && brew upgrade && brew install rpcgen yajl xz && brew link --force python@2 ; fi