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# functions - Common functions used by DevStack components

# apt-get wrapper to set arguments correctly

# apt_get package [package ...]

function apt_get() {

[[ "$OFFLINE" = "True" ]] && return

local sudo="sudo"

[[ "$(id -u)" = "0" ]] && sudo="env"

$sudo DEBIAN_FRONTEND=noninteractive \

http_proxy=$http_proxy https_proxy=$https_proxy \

apt-get --option "Dpkg::Options::=--force-confold" --assume-yes "$@"

}

# Gracefully cp only if source file/dir exists

# cp_it source destination

function cp_it {

if [ -e $1 ] || [ -d $1 ]; then

cp -pRL $1 $2

}

# git clone only if directory doesn't exist already. Since ``DEST`` might not

# be owned by the installation user, we create the directory and change the

# ownership to the proper user.

# Set global RECLONE=yes to simulate a clone when dest-dir exists

# git_clone remote dest-dir branch

function git_clone {

[[ "$OFFLINE" = "True" ]] && return

GIT_REMOTE=$1

GIT_DEST=$2

GIT_BRANCH=$3

if echo $GIT_BRANCH | egrep -q "^refs"; then

# If our branch name is a gerrit style refs/changes/...

if [[ ! -d $GIT_DEST ]]; then

git clone $GIT_REMOTE $GIT_DEST

cd $GIT_DEST

git fetch $GIT_REMOTE $GIT_BRANCH && git checkout FETCH_HEAD

else

# do a full clone only if the directory doesn't exist

if [[ ! -d $GIT_DEST ]]; then

git clone $GIT_REMOTE $GIT_DEST

cd $GIT_DEST

# This checkout syntax works for both branches and tags

git checkout $GIT_BRANCH

elif [[ "$RECLONE" == "yes" ]]; then

# if it does exist then simulate what clone does if asked to RECLONE

cd $GIT_DEST

# set the url to pull from and fetch

git remote set-url origin $GIT_REMOTE

git fetch origin

# remove the existing ignored files (like pyc) as they cause breakage

# (due to the py files having older timestamps than our pyc, so python

# thinks the pyc files are correct using them)

find $GIT_DEST -name '*.pyc' -delete

git checkout -f origin/$GIT_BRANCH

# a local branch might not exist

git branch -D $GIT_BRANCH || true

git checkout -b $GIT_BRANCH

}

# pip install wrapper to set cache and proxy environment variables

# pip_install package [package ...]

function pip_install {

[[ "$OFFLINE" = "True" ]] && return

sudo PIP_DOWNLOAD_CACHE=/var/cache/pip \

HTTP_PROXY=$http_proxy \

HTTPS_PROXY=$https_proxy \

pip install --use-mirrors $@

}

# Normalize config values to True or False

# VAR=`trueorfalse default-value test-value`

function trueorfalse() {

local default=$1

local testval=$2

[[ -z "$testval" ]] && { echo "$default"; return; }

[[ "0 no false False FALSE" =~ "$testval" ]] && { echo "False"; return; }

[[ "1 yes true True TRUE" =~ "$testval" ]] && { echo "True"; return; }

echo "$default"

}