try installing requirements out of py.prereqs from conda, and if that fails from pypi with pip

repo_install_prereqs

#!/bin/bash
SCRIPT_PATH=$(readlink -f ${BASH_SOURCE[0]})
WD=$(dirname ${SCRIPT_PATH})
export PW_HOME=${WD}
if [[ -f ~/anaconda/bin/activate ]];then
    source ~/anaconda/bin/activate ~/anaconda
fi
INST_CACHE_ROOT=~/.pw_install_cache

function check_if_updated()
{
    filename=$1
    filename2="${INST_CACHE_ROOT}/${filename}"
    diff ${filename} ${filename2} > /dev/null
    # 0 - same, 1 - different, 2 - file not found
    if [[ $? -eq 0 ]];then
      echo "no"
    else
      echo "yes"
    fi
}
function update_cache()
{
    filename=$1
    filename2="${INST_CACHE_ROOT}/${filename}"
    mkdir -p $(dirname ${filename2})
    cp -a $filename $filename2
}
#
function repo_install_prereqs()
{
    repodir=${1:?"repo dir"}
    repodir=$(readlink -f ${repodir})
    reponame=$(basename ${repodir})
    export PIP_DOWNLOAD_CACHE=/var/cache/pip
    if [[ -f ${repodir}/install_prereqs && -z ${SKIP_install_prereqs_script} ]]; then
        cd ${repodir}
        ./install_prereqs
    else
        if [[ -f ${repodir}/apt.prereqs ]]; then
          if [[ ! -z ${FORCE_PREREQS_INSTALL} || $(check_if_updated ${repodir}/apt.prereqs) == "yes" ]]; then
            sudo apt-get install -q -y $(grep -v "#" ${repodir}/apt.prereqs)
            if [[ $? -eq 0 ]]; then
              update_cache ${repodir}/apt.prereqs
            fi
          else
            echo "skipping ${repodir}/apt.prereqs, not updated since last prereq install"
          fi
        fi
        if [[ -f ${repodir}/py.prereqs ]]; then
          if [[ ! -z ${FORCE_PREREQS_INSTALL} || $(check_if_updated ${repodir}/py.prereqs) == "yes" ]]; then
            error=0
            regex="^ *#.*"
            regex2="^ *git\+.*"
	    DONE=false
	    until $DONE ;do
		read PKG || DONE=true

                if ! [[ "${PKG}" =~ ${regex} || "X${PKG}" == "X" ]];then
                    ret=1
                    if ! [[ "${PKG}" =~ ${regex2} ]];then
                        conda install --yes "${PKG}"
                        ret=$?
                    fi
                    if [[ ${ret} -ne 0 ]];then
                        pip install --timeout=60 --allow-all-external --allow-unverified ${PKG} ${PKG}
                        ret=$?
                    fi
                    if [[ ${ret} -ne 0 ]];then
                        error=1
                    fi
                fi
            done < ${repodir}/py.prereqs
            if [[ ${error} -eq 0 ]]; then
              update_cache ${repodir}/py.prereqs
            fi
          else
            echo "skipping ${repodir}/py.prereqs, not updated since last prereq install"
          fi
        fi
    fi
}

function repo_install()
{
    repodir=${1:?"repo dir"}
    repodir=$(readlink -f ${repodir})
    reponame=$(basename ${repodir})

    # first install prereqs
    repo_install_prereqs ${reponame}
    if [[ -f ${repodir}/install ]]; then
        cd ${repodir}
        ./install
    fi
}

if [[ $0 == ${BASH_SOURCE[0]} ]];then
# main()
    for repo in $*; do
        if [[ -z ${repo_full_install} ]];then
            repo_install_prereqs ${repo}
        else
            repo_install ${repo}
        fi
    done
fi