Replace uses of SCRIPT_DIR with ROOT_DIR

Using SCRIPT_DIR forces us to refer to any other source files relative to the
current bash file.  Setting ROOT_DIR to be the root of the git repo makes things
simpler and less error prone.

Author: davidtgoldblatt

bash_fns/mkuser.sh

@@ -1,4 +1,4 @@
-source "$SCRIPT_DIR/bash_fns/detect_os.sh"
+source "$ROOT_DIR/bash_fns/detect_os.sh"
 
 function mkuser() {
   local UN="$1"

setup-bb-master.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 set -e
-SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && git rev-parse --show-toplevel)
 
 cd
 rm -rf bb-dir
@@ -12,4 +12,4 @@ source sandbox/bin/activate
 pip install 'buildbot[bundle]'==0.9.4
 pip install txrequests
 buildbot create-master master
-cp "$SCRIPT_DIR"/bb_master_config/* master/
+cp "$ROOT_DIR"/bb_master_config/* master/

setup-bb-worker.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 
 set -e
-SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && git rev-parse --show-toplevel)
 
 if [[ -z $WORKER_BB_SECRETS_FILE ]]; then
   echo "Need WORKER_BB_SECRETS_FILE=[ubuntu|freebsd]_bb_secrets.json defined!"

setup-worker-account.sh

@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 
 set -e
-SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && git rev-parse --show-toplevel)
 
-source "$SCRIPT_DIR/bash_fns/mkuser.sh"
+source "$ROOT_DIR/bash_fns/mkuser.sh"
 
 if [[ -z $WORKER_UNIX_SECRETS_FILE ]]; then
   echo "Need WORKER_UNIX_SECRETS_FILE=[ubuntu|freebsd]_unix_secrets.json defined!"

ubuntu-master/setup-bb-master-account.sh

@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 
-SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && git rev-parse --show-toplevel)
 
-source "$SCRIPT_DIR/../bash_fns/detect_os.sh"
-source "$SCRIPT_DIR/../bash_fns/mkuser.sh"
+source "$ROOT_DIR/bash_fns/detect_os.sh"
+source "$ROOT_DIR/bash_fns/mkuser.sh"
 
 UNIX_UN=`jq --raw-output '.["unix_un"]' ~/secrets/master_unix_secrets.json`
 UNIX_PW=`jq --raw-output '.["unix_pw"]' ~/secrets/master_unix_secrets.json`

ubuntu-master/setup-nginx.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && git rev-parse --show-toplevel)
 
 MASTER_HOST=`jq --raw-output '.["master_host"]' ~/secrets/public.json`
 ADMIN_EMAIL=`jq --raw-output '.["admin_email"]' ~/secrets/public.json`
@@ -11,9 +11,9 @@ if [[ -z $MASTER_HOST || -z $ADMIN_EMAIL ]]; then
 fi
 
 # Get our configuration files where we want them.
-cp "$SCRIPT_DIR/../nginx/master.nginx.conf" /etc/nginx/sites-available/master
-cp "$SCRIPT_DIR/../nginx/master-bootstrap.nginx.conf" /etc/nginx/sites-available/master-bootstrap
-cp "$SCRIPT_DIR/../nginx/ssl-params.nginx.conf" /etc/nginx/snippets/ssl-params.conf
+cp "$ROOT_DIR/nginx/master.nginx.conf" /etc/nginx/sites-available/master
+cp "$ROOT_DIR/nginx/master-bootstrap.nginx.conf" /etc/nginx/sites-available/master-bootstrap
+cp "$ROOT_DIR/nginx/ssl-params.nginx.conf" /etc/nginx/snippets/ssl-params.conf
 
 
 # Rewrite the configuration files to use whatever hostname we're configured for.