postinstall

#!/bin/bash
set -e

PACKAGE=$1
INSTALL_DESTINATION=$2

function IsBrewPkgInstalled
{
    # Check if Homebrew is installed
    /usr/bin/which brew > /dev/null
    if [ $? -eq 0 ]
    then
        # Check if the package has been installed
        brew ls --versions "$1" > /dev/null
        if [ $? -eq 0 ]
        then
            return 0
        fi
    fi
    return 1
}

# Check if Java GCM is present on this system and unlink it should it exist
if [ -L /usr/local/bin/git-credential-manager ] && IsBrewPkgInstalled "git-credential-manager";
then
    brew unlink git-credential-manager
fi

# Create symlink to GCM in /usr/local/bin
mkdir -p /usr/local/bin
/bin/ln -Fs "$INSTALL_DESTINATION/git-credential-manager" /usr/local/bin/git-credential-manager

# Configure GCM for the current user (running as the current user to avoid root
# from taking ownership of ~/.gitconfig).
# Determine the real (non-root) user via multiple methods since the installer
# may be invoked with USER/LOGNAME unset (e.g. when run via Homebrew which
# explicitly clears those environment variables).
# 1. SUDO_USER - set by sudo, works for both GUI (Homebrew) and SSH scenarios.
# 2. stat /dev/console - works for GUI sessions when not running under sudo.
REAL_USER="${SUDO_USER}"
if [ -z "${REAL_USER}" ] || [ "${REAL_USER}" = "root" ]; then
    REAL_USER=$(stat -f%Su /dev/console 2>/dev/null)
fi

if [ -n "${REAL_USER}" ] && [ "${REAL_USER}" != "root" ]; then
    sudo -u "${REAL_USER}" "$INSTALL_DESTINATION/git-credential-manager" configure
else
    echo "warning: unable to determine the installing user; GCM has not been configured automatically." >&2
    echo "warning: run 'git-credential-manager configure' to configure GCM for your user." >&2
fi

exit 0