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#!/bin/bash
# TODO
# * Detect pkgnames by provides, replaces, etc. instead of dir tree

eval $(egrep "PACKAGER|CARCH" /etc/makepkg.conf)
eval $(egrep "ABSROOT" /etc/abs.conf)
eval $(egrep "REPOS|source" /etc/libretools.conf)
source /usr/bin/libremessages

[[ -r $XDG_CONFIG_HOME/libretools/libretools.conf ]] && \
    source $XDG_CONFIG_HOME/libretools/libretools.conf

## START FUNCTIONS ##

function usage {
    echo "cd to a dir containing a PKGBUILD and run:"
    echo "$0 [options]"
    printf "This script will check dependencies, build them if possible "
    printf "and stage the packages on it's repo."
    echo
    echo "OPTIONS:"
    echo " -h          : this message."
    echo " -c          : check deps"
    # printf " -f pkgname  : build even when a package has been built. "
    # printf " Use it as many times as needed\n"
    echo " -a absdir   : set ABSROOT to this dir"
    echo
}

# Queue Management
# * Always get the queue list from the server
# * Add/Remove from queue
# * Check if a package is listed

# TODO
# * Check for concurrence

# Get the queue list from the server
get_queue() {
    wget -N http://repo.parabolangunlinux.org/files/queue $queue_file >/dev/null 2>&1 || {
        error "Failed to retrieve queue list"
        return 1
    }
}

# Put the queue list on the server
put_queue() {
    rsync -e ssh -aq $queue_file $PARABOLAHOST:mips64el/queue >/dev/null 2>&1 || {
        error "Failed to put queue list"
        return 1
    }
}

# Add packages to the queue
update_queue() {
    get_queue || return $?
    basename $PWD | sed "s/$/:$PACKAGER/" >> $queue_file || return 2
    put_queue || return $?
}

# Remove a package from the queue
remove_queue() {
    get_queue || return $?

    grep -vw "^$(basename $PWD)" $queue_file > $queue_file.2
    cat $queue_file.2 > $queue_file

    put_queue && rm $queue_file.2  && return 0 || return $?
}

# Checks if a package is listed
check_queue() {
    get_queue || return $?

    local packager=$(grep -w "$(basename $PWD)" ${queue_file} | cut -d ':' -f2)

    [[ ! -z $packager ]] && [[ "$packager" != "$PACKAGER" ]] && {
        warning "$(basename $PWD) is being packaged by $packager. Please wait."
        return 1
    }

    return 0
}

# END Queue Management #

guess_repo() {
    basename $(dirname $(pwd))
}

# Usage: cleanup [ $(basename $PWD) ] from PKGBUILD dir
# cleans the tempdir
function cleanup {
    if [ ! -d $tempdir/ ]; then
	return 1
    elif [ -d $tempdir -a ${#@} -gt 0 ]; then
	for _dir in $@; do
	    rm -rf $tempdir/$_dir/
	done
    fi
}
# Usage: find_deps
# no parameters
function find_deps {
    [ $level -lt 20 ] || return 20
    ## Check this level.
    source PKGBUILD
    local repo=${repo:-$(guess_repo)}

    # TODO: If this package is in force_build: skip this step
    # If package is built exit
    if is_built "${pkgbase:-${pkgname[0]}}>=${pkgver}-${pkgrel}";
    then
	msg2 "${pkgbase:-${pkgname[0]}}>=${pkgver}-${pkgrel} : built"; exit 0
    fi
    
    msg2 "${pkgbase:-${pkgname[0]}}>=${pkgver}-${pkgrel}"

    # Tell which packages are deeper in deps (even if they are on tempdir)
    # so we can build them first.
    echo "${level}: $(basename $PWD)" >> "${tempdir}/.BUILDORDER"

    # if pkgbuild directory is on tempdir, do not copy and exit
    if [ -d "${tempdir}/$(basename $PWD)" ]; then
	exit 0
    else
	cp -r ../$(basename $PWD) ${tempdir}/
	# Info to eval later
	echo "repo=$repo" > "${tempdir}/$(basename $PWD)/.INFO"
    fi

    ## Check next levels
    # Clean version checking
    deps=$(echo "${depends[@]} ${makedepends[@]} ${pkgdeps[@]}" | \
	sed "s/[=<>]\+[^ ]\+//g" | \
	tr ' ' "\n" | \
	sort -u)
    declare -i next_level=$level+1
    for _dep in ${deps[@]}; do
	for _repo in ${REPOS[@]}; do
	    # try to find $_dep on each repo from dirname
	    [ -e "$ABSROOT/${_repo}/$_dep/PKGBUILD" ] && {
		pushd "$ABSROOT/${_repo}/$_dep" >/dev/null
		"$0 -c '${check_deps_file}' -d '${tempdir}' -l '${next_level}'"
		# Circular deps must fail
		[ $? -eq 20 ] && return 20
		popd >/dev/null
		# found, go to next dep
		break 1
	    }
	    # search pkgname in repo if that doesn't work
	    # this should find pkgsplits
	    _dir=$(find "$ABSROOT/${_repo}" -type f -name PKGBUILD -print0 | \
		"xargs" -0 -e grep -H -E "pkgname|pkgbase" | grep $_dep) && {
		pushd $(dirname $(echo $_dir | cut -d: -f1)) >/dev/null
		"$0 -c '${check_deps_file}' -d '${tempdir}' -l '${next_level}'"
		# Circular deps must fail
		[ $? -eq 20 ] && return 20
		popd > /dev/null
		# found, go to next dep
		break 1
	    }
	done
    done
    unset next_level dir
}

## END FUNCTIONS ##

force_build=""
level=0
while getopts 'ha:c:d:l:' arg; do
    case $arg in
	h) usage; exit 0 ;;
	a) ABSROOT="$OPTARG" ;;
	c) check_deps_file="$OPTARG" ;;
	# f) force_build+="-f pkgname " ;;
	d) tempdir="$OPTARG" ;;
	# hidden function to know what to build first.
	# if $level > 0 it will not build
	l) level=$OPTARG ;;
    esac
done
mkdir -p $XDG_CONFIG_HOME/libretools
queue_file=$XDG_CONFIG_HOME/libretools/queue
ban_file=$XDG_CONFIG_HOME/libretools/ban
touch $queue_file $ban_file
# Only on level 0
[ $level -eq 0 ] && {
    # if tempdir exist use it, else make a tempdir
    tempdir="$(mktemp -d /tmp/fullpkg.XXXXXX)"
    check_deps_file=$tempdir/deps
    msg "Updating pacman db and packages"
    sudo pacman -Syu --noconfirm
    msg "Checking dependencies"
}
buildorder=$tempdir/.BUILDORDER
touch $buildorder $tempdir/deps $tempdir/false $tempdir/install
touch $check_deps_file

[[ ! -r PKGBUILD ]] && {
    error "This isn't a build directory"
    usage && exit 1
}

## if $level = 20 there is highly likely there are circular deps
[ $level -eq 20 ] && exit 20

find_deps || { 
    # if find_deps finds circular deps
    # it should exit with status 20
    [ $? -eq 20 ] && \
	# only show message on level 0
    [ $level -eq 0 ] && \
	error "Check for circular deps on $tempdir/.BUILDORDER";
    exit 20
}

# levels greater than 0 must only check deps
[ $level -gt 0 ] && exit 0


# check .BUILDORDER to not include banned deps and
[ $level -eq 0 -a -d $tempdir ] && {
    # Check for banned deps
    if [ -w $ban_file -a -r $ban_file ]; then
	chmod o+rw $ban_file || error "Ban file is not readable/writable ($ban_file)"
    else
	wget -N http://repo.parabolagnulinux.org/files/ban $ban_file >/dev/null 2>&1 || \
	    warning "Failed to get ban list" && [ -r $ban_file ] && {
	    # continue if download failed but local copy
	    search=$(cat $ban_file | tr "\n" "|")
	    echo ${@} | tr " " "\n" | egrep -w $search $buildorder | cleanup
	    echo ${@} | tr " " "\n" | egrep -vw $search $buildorder > $buildorder.2
	    mv $buildorder.2 $buildorder
	    unset search
	}
    fi
}

## START Building
msg "Building packages:"
pushd "$tempdir"

[ ! -w $queue_file ] && error "can't write queue file"

trap "break" INT
trap "remove_queue" EXIT INT QUIT TERM KILL
build_packages=$(sort -gr $buildorder | cut -d: -f2)
while [ ${#build_packages[@]} -gt 0 ]; do
    build_packages=$(sort -gr $buildorder | cut -d: -f2)
    pushd $temp_dir/${build_packages[0]}
    egrep -vw ${build_packages[0]} $buildorder > $buildorder.2
    mv $buildorder.2 $buildorder
    unset build_packages
    eval $(egrep "pkgname|pkgbase|pkgver|pkgrel" PKGBUILD)
    msg2 "${pkgbase:-${pkgname[0]}} $pkgver-$pkgrel"
    if ! grep mips64el PKGBUILD >/dev/null; then
	plain "Adding mips64el arch"
	sed -i "s/^\(arch=([^)anym]\+\))/\1 'mips64el')/" "PKGBUILD"
    fi
	# Let everybody know we're building this.
    update_queue || {
	warning "Couldn't update the queue, let your partners know about this."
    }
    makepkg --noconfirm  --nocheck -smciL; r=$?
    case $r in
	0) plain "The build was succesful."
	    source .INFO && [ -n $repo ] &&	librestage $repo || \
		echo "unstaged: $(basename $PWD)" >> $tempdir/failed
	    echo "$(basename $PWD)" >> $tempdir/install
	    cleanup "$(basename $PWD)"
	    msg2 "Sync db again"
	    sudo pacman -Sy ;;
	1) error "There were errors while trying to build the package." 
	    echo "failed: $(basename $PWD)" >> $tempdir/failed ;;
	2) error "The build failed." && echo "failed: $(basename $PWD)" >> $tempdir/failed ;;
    esac
    popd >/dev/null
done

msg "Those packages were installed"
plain $(cat $tempdir/install | tr "\n" " ")

msg "Uploading packages to the server"
librerelease

pkgs=$(cat $tempdir/failed | grep "failed:") && {
    error "Those packages failed to build:"
    plain "$(echo ${pkgs[@]} | cut -d: -f2)"
}
pkgs=$(cat $tempdir/failed | grep "unstaged:") && {
    error "Those packages couldn't be staged because of missing reponame:"
    plain "$(cat $tempdir/failed | grep "unstaged:" | cut -d: -f2)"
}

exit 0