apt-get.sh code

[Glenn McGrath <bug1@optushome.com.au>]

I have something working now, theres heaps it doesnt do, so i will just
say what it does.

Only tried under bash, can do update or install

Update reads sources.list, fetch Package.gz using wget or cp to
/var/state/apt/lists/ and changes the filename.

Install accepts multiple package names as arguments, searches files in
/var/state/apt/lists in the order specified in sources.list to see if
package is available, fetch package from coresponding site to
/var/cache/apt/archive then uses dpkg to install the package.

Doesnt do dependency checking yet.

It is attached, i will put it into cvs tommorow, i guess i will put it
in /debian-installer/tools

Glenn

#!/bin/sh
# Partitial implementation of debians apt-get command
# GPL Glenn McGrath
# Shell commands used 
#
# BUGS/LIMITATIONS
# update: always fetches rather than checking if the file to download is newer
#         doesnt fetch Release

SRCLIST="/etc/apt/sources.list"
LISTDIR="/var/state/apt/lists/"
HOSTTYPE="i386"
SITE_LIST=
PKG_LIST=

fetchFile() {
	local METHOD=`echo $1|cut -d ':' -f 1`
	case $(echo $1| cut -d ':' -f 1) in
		ftp)
			echo "uri "$1
			wget -nv $1
			;;
		http)
			wget -nv $1
			;;	
		file)
			cp $1 .
			;;
		*)
			echo "unknown fetch method"
	esac
}

update() {
	for SITE in $SITE_LIST
	do
		cd $LISTDIR
		if [ -e "Packages.gz" ]
		then
			rm Packages.gz
		fi
		fetchFile $SITE".gz"
		if [ -s "Packages.gz" ]
		then
			gunzip Packages.gz
			FILE=`echo $SITE| sed 's/^.*:\/*//'|sed 's/\//_/g'`
			mv -f Packages $FILE
		fi
	done
}

checkDeps() {
# check dependencies of $*, if necessary add dependencies to $PKG_LIST and try again
	echo "dependency checks not implemented yet"
}

parseLine() {
	local TYPE=$1
	local URI=`echo $2 |sed 's/\/$//'`
	local DIST=$3
	shift 3
	local SECTIONS=$*
	local NEWSITE=
	for SECTION in $SECTIONS
		do
			NEWSITE=`echo "/dists/"$DIST"/"$SECTION"/binary-"$HOSTTYPE"/Packages" | sed 's/\/\//\//g'`
			SITE_LIST=$SITE_LIST" "$URI$NEWSITE
		done
}

parseSourceList() {
	LASTLINENO=`wc -l <$SRCLIST`
	CURLINENO="1"
	while [ $CURLINENO -le $LASTLINENO ]
		do
			CURLINE=`head -n $CURLINENO $SRCLIST | tail -n 1 -`
			VALIDLINE=`echo $CURLINE |sed -n '/^deb /p'`
			if [ "$VALIDLINE" != "" ]
				then
					parseLine $VALIDLINE
			fi
			CURLINENO=`expr $CURLINENO + 1`
		done 
}

install() {
	local TMPFILE="/tmp/pkgentry.tmp"
	local FETCHDIR="/var/cache/apt/archives/"
	PKG_LIST=`echo $* |cut -d ' ' -f 2-`
	checkDeps $PKG_LIST
	for PKGNAME in $PKG_LIST
	do
		if [ -e $TMPFILE ]
		then
			rm -f $TMPFILE
		fi
		for SITE in $SITE_LIST
		do
			FILE=`echo $SITE| sed 's/^.*:\/*//'|sed 's/\//_/g'`
			FETCH=`echo $FILE | sed 's/.*:\/*//' | sed 's/_dists.*//'`
			FETCH_HOST=`echo $FETCH | cut -d '_' -f 1`
			FETCH_PATH=`echo $FETCH | cut -d '_' -f 2-`
			sed -n /^Package:."$PKGNAME"$/,/^\s*$/p $LISTDIR$FILE > $TMPFILE
			PKGPATH=`grep "Filename: " $TMPFILE |cut -d ' ' -f 2`
			for SITE in $SITE_LIST
			do
				SITE_HOST=`echo $SITE| sed 's/.*:\/*//'|cut -d '/' -f 1`
				SITE_PATH=`echo $SITE| sed 's/.*:\/*//'|cut -d '/' -f 2-|sed 's/\//_/g'|sed 's/_dists.*//'`
				if [ "$SITE_HOST" = "$FETCH_HOST" ] && [ "$SITE_PATH" = "$FETCH_PATH" ]
				then
					FILENAME=`echo $SITE"/"$PKGPATH | sed 's/^.*\///'`
					cd $FETCHDIR"/partial"
					URI=`echo $SITE|sed 's/\/dists.*//'`
					fetchFile $URI"/"$PKGPATH
					if [ -s $FILENAME ]
					then
						mv $FILENAME $FETCHDIR
						cd $FETCHDIR
						dpkg -i $FILENAME
						break 2
					else
						echo "failed to fetch "$FILENAME
					fi
				fi
			done
		done
	done
}

usage() {
	echo "apt-get [update|install]"
}

# Main functionality starts here
parseSourceList
case $1 in
	update)
		update
		;;
	install)
		if [ "$2" = "" ]
			then
				echo "You need to specify a package"
				usage
			else
				install $*
		fi
		;;
	*)
		usage
esac