github-install-v2.sh

github-install.sh

#!/bin/bash
#
# This script downloads the specified GitHub repository and installs it in current directory.

set -u -e

# Command-line parameters.
GITHUB_REPO=${1:-Bricks}
GITHUB_USER=${2:-KnowSheet}
GITHUB_BRANCH=${3:-master}

# The URL to fetch a .tar.gz from.
URL=https://github.com/$GITHUB_USER/$GITHUB_REPO/archive/$GITHUB_BRANCH.tar.gz

# A temporary directory, expected to be .gitignore-d.
TMPDIR=tmp

( 
  mkdir -p $TMPDIR
  cd $TMPDIR
  rm -rf $GITHUB_REPO $GITHUB_REPO-$GITHUB_BRANCH
  echo -n "github.com/$GITHUB_USER/$GITHUB_REPO@$GITHUB_BRANCH: "
  curl -s -L $URL | tar xfz - || (echo "Failed, please check whether $URL can be fetched."; exit 1)
  mv $GITHUB_REPO-$GITHUB_BRANCH $GITHUB_REPO
  echo -ne "\b\b\b, install: "
)

if [ -d $GITHUB_REPO ] ; then
  if diff -r $GITHUB_REPO $TMPDIR/$GITHUB_REPO ; then
    echo "Up to date."
  else
    echo "Conflict, please fix or reinstall."
    echo "For a quick workaround, try renaming the current revision under another name:"
    echo "mv ${GITHUB_REPO} ${TMPDIR}/$GITHUB_REPO-$(date +%Y%m%d-%H%M%S)"
    echo "and then re-run the same command."
    exit 1
  fi
else
  mv $TMPDIR/$GITHUB_REPO .
  echo "Installed."
fi