#! /bin/bash

# connect to the Git repository through a SOCKS proxy


# default setting is to use port 1080 on the local host
proxy="localhost:1080"
from="default"

# check if there is a value in the git configuration
if git config --get socks.proxy >& /dev/null; then
    proxy=`git config --get socks.proxy`
    from="git's socks.proxy"
fi

# check if a generic proxy has been defined in the environment
if [ -n "$ALL_PROXY" ]; then
    proxy="$ALL_PROXY"
    from="\$ALL_PROXY"
fi
if [ -n "$all_proxy" ]; then
    proxy="$all_proxy"
    from="\$all_proxy"
fi

# check if a SOCKS proxy has been defined in the environment
if [ -n "$SOCKS_PROXY" ]; then
    proxy="$SOCKS_PROXY"
    from="\$SOCKS_PROXY"
fi
if [ -n "$socks_proxy" ]; then
    proxy="$socks_proxy"
    from="\$socks_proxy"
fi
if [ -n "$SOCKS5_PROXY" ]; then
    proxy="$SOCKS5_PROXY"
    from="\$SOCKS5_PROXY"
fi
if [ -n "$socks5_proxy" ]; then
    proxy="$socks5_proxy"
    from="\$socks5_proxy"
fi

# check if a git specific SOCKS proxy has been defined in the environment
if [ -n "$GIT_SOCKS_PROXY" ]; then
    proxy="$GIT_SOCKS_PROXY"
    from="\$GIT_SOCKS_PROXY"
fi

function usage() {
cat << @EOF
Usage:
  `basename $0` HOST PORT

Helper script to connect to a Git repository over the git:// protocol at host HOST and port PORT through a SOCKS proxy at $proxy ($from).

To use the proxy for all git:// traffic, set the core.gitproxy option to "git-proxy":

  git config core.gitproxy "git-proxy"


To use the proxy only for some reporitories, use the syntax explained in git-config(1).

To configure which proxy to use, set an appropriate environment variable (see below) or socks.proxy option to the proxy address, for example "localhost:1080":

  git config socks.proxy "localhost:1080"


The address of the proxy is read from (in order of priority):
  - the GIT_SOCKS_PROXY environment variable;
  - the SOCKS_PROXY or SOCKS5_PROXY environment variable;
  - the ALL_PROXY environment variable (see curl(1));
  - the socks.proxy git option;
  - the default value: localhost:1080 .
@EOF
}

if [ -z "$1" ] || [ -z "$2" ] || [ -n "$3" ]; then
  usage
  exit 1
fi

# connect through the specifid proxy
nc -x "$proxy" "$1" "$2"