[eschwartz]

As there have been a couple times now that Kovid pushed an updated binary due to critical errors, I upgraded my update script to allow a "force" option, this keeps everything in one script.

It looks like this now:

#!/bin/bash

# Unset git development source
export CALIBRE_DEVELOP_FROM=
# by default, switch is off
force_upgrade=0

# Functions

usage()
{
	cat <<- _EOF_
		Usage: calibre-upgrade [OPTIONS]
		Upgrades calibre installation. Automaticaly checks if the current version is up to date.

		OPTIONS
		    -f, --force        Force an update. This is only useful if binaries
		                       were updated for a critical error :shrug:
_EOF_
}

do_upgrade()
{
	cd ~/bin/calibre-portable
	rm -rf ../calibre-portable/*
	wget -O - "http://status.calibre-ebook.com/dist/linux32" | tar xjf -
}

# Options
while [ "$1" != "" ]; do
	case $1 in
		-h|--help)		usage
						exit
						;;
		-f|--force)		shift
						force_upgrade=1
						;;
		*)				echo "calibre-upgrade: unrecognized option '$1'"
						echo "Try 'calibre-upgrade --help' for more information."
						exit 1
	esac
	shift
done

# Main

	calibre-debug -c "import urllib as u; from calibre.constants import numeric_version; raise SystemExit(int(numeric_version  < (tuple(map(int, u.urlopen('http://calibre-ebook.com/downloads/latest_version').read().split('.'))))))"

UP_TO_DATE=$?


if [ "$UP_TO_DATE" = 0 ]; then
	echo "Calibre is up-to-date"

	if [ "$force_upgrade" = 1 ]; then
		echo ""
		echo "Forcing upgrade anyway -- are you sure you want to continue? [y/n]"
		read answer

		if [[ "$answer" = "y" || "$answer" = "yes" ]]; then
			do_upgrade
		else
			echo "Exiting..."
			exit 1
		fi
	fi
else
	do_upgrade
fi

Keep in mind I only use

cd ~/bin/calibre-portable
rm -rf ../calibre-portable/*
wget -O - "http://status.calibre-ebook.com/dist/linux32" | tar xjf -

to upgrade since I am not running as sudo -- I'm on a school computer ATM