Allow override install options

It's conceivable that people may want to fork and utilize their own copy
of the aviary repository.  Depending on the environment where it's
being installed, various paths and other install-time options may need
to be adjusted.  Allow for this by accepting non-default values for
key installer options.

Also, disable existing cron entries with indication of what and when.

Signed-off-by: Chris Evich <cevich@redhat.com>

Author: cevich

install

@@ -3,12 +3,12 @@
 set -euo pipefail
 
 function run() {
-  VERSION=1.3.2
-  INSTALL_PATH=/var/lib
-  AV_PATH=$INSTALL_PATH/aviary/av
-  RELEASE_URL=https://gitlab.com/dchester/aviary.sh/-/archive/${VERSION}/aviary.sh-${VERSION}.tar.gz
+  VERSION="${VERSION:-1.3.2}"
+  INSTALL_PATH="${INSTALL_PATH:-/var/lib/aviary}"
+  AV_PATH="$INSTALL_PATH/av"
+  RELEASE_URL="${RELEASE_URL:-https://gitlab.com/dchester/aviary.sh/-/archive/${VERSION}/aviary.sh-${VERSION}.tar.gz}"
   INVENTORY_GIT_URL=${1:-""}
-  CONFIG_FILE=${INSTALL_PATH}/aviary/config
+  CONFIG_FILE="${CONFIG_FILE:-${INSTALL_PATH}/config}"
 
   # check for git dependency
   if ! /usr/bin/which git > /dev/null; then
@@ -20,23 +20,24 @@ function run() {
     echo "Installing with no inventory git url; set later in $CONFIG_FILE"
   fi
 
-  if [[ -e /var/lib/aviary ]]; then 
+  if [[ -d "$INSTALL_PATH" ]]; then
     echo "Found existing installation at $INSTALL_PATH; exiting"
     exit 1
   fi
 
   echo Installing to ${INSTALL_PATH}...
-  mkdir -p ${INSTALL_PATH}/aviary
-  curl -s $RELEASE_URL | tar --strip-components=1 -C ${INSTALL_PATH}/aviary -xz
-  ln -sf /var/lib/aviary/av /usr/bin/av
-  mkdir -p ${INSTALL_PATH}/aviary/inventory
+  mkdir -p ${INSTALL_PATH}
+  curl -s $RELEASE_URL | tar --strip-components=1 -C ${INSTALL_PATH} -xz
+  ln -sf "$AV_PATH" /usr/bin/av
+  mkdir -p ${INSTALL_PATH}/inventory
 
   if [[ ! -z "$INVENTORY_GIT_URL" ]]; then
     echo "inventory_git_url=$INVENTORY_GIT_URL" >> $CONFIG_FILE
   fi
 
   echo Adding entry to /etc/crontab...
-  echo "$(cat /etc/crontab | grep -v $AV_PATH)" > /etc/crontab
+  NOW="$(date --iso-8601=minutes)"
+  sed -r -e "s|^(.*"$AV_PATH".*)|\# $NOW install disabled: \1|" /etc/crontab
   echo "* * * * * root $AV_PATH directive >> /var/log/aviary-directive.log 2>&1" >> /etc/crontab
   echo "$(( RANDOM % 60 )) * * * * root $AV_PATH apply >> /var/log/aviary.log 2>&1" >> /etc/crontab