I recently updated SourceTree to version 1.9.9.20, and it seems to no longer be using the PATH environment variable correctly. In particular, my commit-msg git hook is failing with the following message:

`/usr/bin/env: 'python': No such file or directory`

If I modify the script to run as a bash script, and have it `echo $PATH`, I get the following:

`/mingw64/libexec/git-core:/mingw64/bin:/usr/bin:/c/Users/n0030352/bin:/c/Users/n0030352/AppData/Local/Atlassian/SourceTree/gitflow_local/gitflow:/bin:/mingw32/bin:/mingw64/bin:/c/Program Files (x86)/Atlassian/SourceTree/tools:/c/Users/n0030352/AppData/Local/Atlassian/SourceTree/git_extras`

I get this error using both embedded and system git.

However, if I use the git terminal out of SourceTree, I get the correct PATH variable output, none of which contains SourceTree. I can also commit just fine.

So my guess is that the PATH variable output by SourceTree contains application-specific modification to the PATH variable, which fails to include the rest of the paths. For now I am just going to use 1.9.6.2 (https://downloads.atlassian.com/software/sourcetree/windows/SourceTreeSetup_1.9.6.2.exe).

Potential workaround:

You may need to make node available in a location which is already on the default system path, like `/usr/local/bin`, or you need to add a custom entry to $PATH in a way that can been seen by Mac Apps, not just your terminal. Here's how to do so: http://stackoverflow.com/a/26586170