-bash: __git_ps1: Command Not Found

Today I updated mac ports and a new error started to show up at the command line saying that the __git_ps1 command is not found.

This is because I added the git branch in my bash prompt long time back and in last update of git-core port they moved the __git_ps1 bash functions to a separate script.

To fix it, you just need to include following lines in your .profile (or .bashrc):

if [ -f /opt/local/share/doc/git-core/contrib/completion/git-prompt.sh ]; then
    . /opt/local/share/doc/git-core/contrib/completion/git-prompt.sh
fi

It worked for me.

Depending on your git installation, this file may be located elsewhere; find command should help in this case.