performs releases from zips meant to overwrite live files, backs up & allows you to preview changes beforehand

patcher.sh

#!/bin/bash

method="$1"
name="$2"
archives="$(dirname "${BASH_SOURCE[0]}")"
live=`pwd`
release="$archives/$name.zip"
backup="$archives/${name}_BAK.zip"
log="$live/released.txt"

mapfile -t files < <(zipinfo -1 "$release" 2>/dev/null | grep -v '/$' | sort)
if [ ${#files[@]} -eq 0 ]
then
	echo "Release '$name' not found"
	exit 1
fi
if [ -f "$backup" ]
then
	echo "This had been released $(date -d "@$( stat -c '%Y' "$backup" )")"
	mapfile -t saved < <(zipinfo -1 "$backup" 2>/dev/null | grep -v '/$' | sort)
else
	echo 'This has not been released'
	mapfile -t saved < <(
		printf '%s\n' "${files[@]}" \
		| while IFS= read -r file
  		do
			[[ -f "$live/$file" ]] && echo "$file"
  		done
	)
fi
echo 'Calculating modifications'
mapfile -t changed < <(
	printf '%s\n' "${saved[@]}" \
	| while IFS= read -r file
  	do
		diff -q \
			<(unzip -p "$release" "$file") \
			<([[ -f "$backup" ]] && unzip -p "$backup" "$file" || cat "$live/$file") \
		>/dev/null \
		|| echo "$file"
  	done
)
if [ ${#changed[@]} -eq 0 ]
then
	echo 'No changes!'
	exit 1
fi
mapfile -t introduced < <(comm -23 <(printf '%s\n' "${files[@]}") <(printf '%s\n' "${saved[@]}"))

echo "You are attempting to $method"
(
	echo "You are attempting to $method"
	echo "Below are the files associated with $name"
	echo
	echo "Files introduced:"
	printf '%s\n' "${introduced[@]}"
	echo
	echo "Changed files:"
	printf '%s\n' "${changed[@]}"
	#echo
	#echo "Others:"
	#comm -13 <(printf '%s\n' "${changed[@]}") <(printf '%s\n' "${saved[@]}")
) | less

read -p "Hit Ctrl-C if that didn't look right"

case "$method" in
release)
	if [ -f "$backup" ]
	then
		echo 'This has already been backed up'
		echo 'Please restore the backup before trying again'
		exit 1
	fi

	echo "Backing up to '$backup'"
	pushd "$live"
	for file in "${files[@]}"
	do
		zip "$backup" "$file"
	done
	popd

	echo "Releasing '$release' to '$live'"

	for file in "${changed[@]}" "${introduced[@]}"
	do
		unzip -d "$live" -o "$release" "$file"
	done
	;;

restore)
	if [ ! -f "$backup" ]
	then
		echo 'No backup has been made'
		exit 1
	fi

	echo "Temporary backup at '$archives/tmp.zip'"
	rm "$archives/tmp.zip"
	pushd "$live"
	for file in "${files[@]}"
	do
		zip "$archives/tmp.zip" "$file"
	done
	popd

	echo "Restoring pre-$name @$(date -d "@$( stat -c '%Y' "$backup" )") to '$live'"
	unzip -d "$live" -o "$backup"

	read -p "Hit Ctrl-C if there are errors, otherwise we will remove the backup"
	rm "$backup"
	;;

#difference between backup and release
changed)
	vimdiff -c 'set diffopt+=iwhite | set t_Co=0' \
		<(for file in "${saved[@]}"
  		do
			printf 'Archive:  %s\n  inflating: %s\n' "$release" "$file"; \
			unzip -p "$release" "$file" \
			| file -b --mime-encoding - \
			| grep binary >/dev/null \
			&& (unzip -p "$release" "$file" | sha512sum -b | cut -d' ' -f1) \
			|| (unzip -p "$release" "$file"); \
			echo
  		done
		) \
		<(for file in "${saved[@]}"
  		do
			printf 'Archive:  %s\n  inflating: %s\n' "$backup" "$file"; \
			unzip -p "$backup" "$file" \
			| file -b --mime-encoding - \
			| grep binary >/dev/null \
			&& (unzip -p "$backup" "$file" | sha512sum -b | cut -d' ' -f1) \
			|| (unzip -p "$backup" "$file"); \
			echo
  		done
		)
	;;

#difference between live and release
preview)
	vimdiff -c 'set diffopt+=iwhite | set t_Co=0' \
		<(for file in "${changed[@]}"
  		do
			printf 'Archive:  %s\n  inflating: %s\n' "$release" "$file"; \
			unzip -p "$release" "$file" \
			| file -b --mime-encoding - \
			| grep binary >/dev/null \
			&& (unzip -p "$release" "$file" | sha512sum -b | cut -d' ' -f1) \
			|| (unzip -p "$release" "$file"); \
			echo
  		done
		) \
		<(for file in "${changed[@]}"
  		do
			printf 'Archive:  %s\n  inflating: %s\n' "$live" "$file"; \
			file -b --mime-encoding "$live/$file" \
			| grep binary >/dev/null \
			&& (sha512sum -b "$live/$file" | cut -d' ' -f1) \
			|| (cat "$live/$file"); \
			echo
  		done
		)
	;;

#difference between live and backup
since)
	vimdiff -c 'set diffopt+=iwhite | set t_Co=0' \
		<(for file in "${saved[@]}"
  		do
			printf 'Archive:  %s\n  inflating: %s\n' "$backup" "$file"; \
			unzip -p "$backup" "$file" \
			| file -b --mime-encoding - \
			| grep binary >/dev/null \
			&& (unzip -p "$backup" "$file" | sha512sum -b | cut -d' ' -f1) \
			|| (unzip -p "$backup" "$file"); \
			echo
  		done
		) \
		<(for file in "${saved[@]}"
  		do
			printf 'Archive:  %s\n  inflating: %s\n' "$live" "$file"; \
			file -b --mime-encoding "$live/$file" \
			| grep binary >/dev/null \
			&& (sha512sum -b "$live/$file" | cut -d' ' -f1) \
			|| (cat "$live/$file"); \
			echo
  		done
		)
	;;

*)
	echo "'$method' unrecognised"
esac