check_macos_shasum

#!/bin/bash

## Tiny script to download the latest MDB TGZ for macOS
## and spit out the shasum, for use in updating the
## brew formula each new MDB version

## Requires the version of MDB you wish to download and
## compute the SHA for as a parameter.

TMPSPACE=/tmp/check_macos_shasum$$

## Check for provided parameter:
PARAMETER=$1

## Parse user-provided parameter and determine what to do:
if [[ -z $PARAMETER || ! -z $2 ]]; then
   echo -e "\nERROR: Either no or 2+ parameters provided. You must provide ONE"
   echo -e "     MDB version like: v4.2.3, v4.0.14, etc"
   echo -e "     Exiting ...\n"
   exit;
elif [ `echo $PARAMETER | sed 's%^v%%g' | egrep -c '^[0-9]\.[0-9]\.[0-9]{1,2}$'` -lt 1 ]; then
   echo -e "\nERROR: Invalid MDB  version provided."
   echo -e "       Must be ONE MDB version like: v4.2.3, v4.0.14, etc"
   echo -e "       Exiting ...\n"
   exit;
else
   VERS=`echo $PARAMETER | sed 's%^v%%g'`
fi

## Compute branch for float comparison:
VERS_BRANCH=`echo $VERS | awk -F'.' '{print $1"."$2}'`

## MDB v4.2 changed filename. Use appropriate URL and FILENAME:
if [[ $(echo "$VERS_BRANCH < 4.2" | bc -l) -eq 1 ]]; then
   URL="https://fastdl.mongodb.org/osx/mongodb-osx-ssl-x86_64-$VERS.tgz"
   FILENAME="mongodb-osx-ssl-x86_64-$VERS.tgz"
else
   URL="https://fastdl.mongodb.org/osx/mongodb-macos-x86_64-$VERS.tgz"
   FILENAME="mongodb-macos-x86_64-$VERS.tgz"
fi

## Check if download is available for this version:
STATUS=`curl -s -I $URL | head -n 1 | cut -d$' ' -f2`

## If no download available for this version:
if [ ! $STATUS == "200" ]; then
   echo -e "\nNo macOS TGZ for $VERS found."
   echo "Exiting ..."
## If available, download, compute SHASHUM, and delete:
else
   mkdir -p $TMPSPACE
   CURRENTDIR=`pwd`
   cd $TMPSPACE
   echo -e "\nDownloading the macOS TGZ for MDB $VERS ..."
   cd $TMPSPACE
   curl -O -# $URL
   SHASUM=`shasum -a 256 $FILENAME | awk '{print $1}'`
   echo -e "\n   SHASUM = $SHASUM"
   echo -e "\n###############################################################################\n"
   cd $CURRENTDIR
   rm -rf $TMPSPACE
fi

exit