Fix the script when sourced from zsh

When the novarc file is sourced from the Zsh, it fails due to a few
Bash specifics:
- $BASH_SOURCE - does not exist in Zsh
- readarray - does not exist in Zsh

Resolves issue #176

Signed-off-by: Marcin Wilk <[email protected]>

openstack/novarc

@@ -4,7 +4,7 @@ juju_status_json_cache=`mktemp`
 cleanup () { rm -rf $juju_status_json_cache; }
 trap cleanup EXIT KILL
 
-scriptdir=$(readlink --canonicalize $(dirname ${BASH_SOURCE}))
+scriptdir=$(readlink --canonicalize $(dirname ${BASH_SOURCE[0]-$0}))
 
 # cache juju status
 juju status --format=json > $juju_status_json_cache
@@ -25,7 +25,7 @@ if [ -n "`juju config keystone ssl_cert`" ]; then
 elif ((`jq -r '.applications[]| select(."charm-name"=="vault")' $juju_status_json_cache| wc -l`)); then
     # Vault-based ssl
     if `jq -r '.applications.vault.relations.certificates[]' $juju_status_json_cache| grep -q keystone`; then
-        readarray -t VAULT_STATUS < <(juju status vault --format=json | jq -r '.applications.vault.units."vault/0"."workload-status" | .current,.message')
+        VAULT_STATUS=( $(juju status vault --format=json | jq -r '.applications.vault.units."vault/0"."workload-status" | .current,.message') )
         if [[ "${VAULT_STATUS[0]}" == "blocked" && "${VAULT_STATUS[1]}" == "Vault needs to be initialized" ]]; then
             read -p "$(cat <<-END
 This deployment is using vault-based ssl certificates
@@ -57,7 +57,7 @@ unset _OS_PARAMS
 # If user was specified use it
 if [[ $# -gt 1 && $1 = --service ]]; then
     RELATION_ID=$(juju run --unit $2/leader -- relation-ids identity-service | cut -d : -f 2)
-    readarray -t CREDENTIALS < <(juju run --unit $2/leader -- relation-get --relation ${RELATION_ID} --format json - keystone/0)
+    CREDENTIALS=( $(juju run --unit $2/leader -- relation-get --relation ${RELATION_ID} --format json - keystone/0) )
 
     export OS_USERNAME=$(echo ${CREDENTIALS} | jq --raw-output .service_username)
     export OS_USER_DOMAIN_NAME=$(echo ${CREDENTIALS} | jq --raw-output .service_domain)
@@ -73,7 +73,7 @@ else
     # if the admin password is not set in the configuration, then it's read
     # from the leader databag.
     _CONFIG_PASSWD="$(juju config keystone admin-password| awk '{print tolower($0)}')"
-    if [ "${_CONFIG_PASSWD}" == "none" ] || [ "${_CONFIG_PASSWD}" == "" ]; then
+    if [[ "${_CONFIG_PASSWD}" == "none" ]] || [[ "${_CONFIG_PASSWD}" == "" ]]; then
         export OS_PASSWORD=$(juju run -u keystone/leader leader-get admin_passwd)
     else
     export OS_PASSWORD="$(juju config keystone admin-password)"