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#!/bin/sh

. "$(dirname $0)"/libcomain

tbname="$name-$version"

if test $# -ge 1; then
    from="$1"
    tbname="$tbname++$from"
    shift
else
    from=master
fi

if test $# -gt 0; then die 1 "usage: $0 [branch]"; fi

echo " => Prepare new directory..."
tb="$(pwd)/$tbname"
if test -e $tb; then error 2 "File '$tb' already exists"; fi
if test -e $tb.tar.xz; then error 2 "File '$tb.tar.xz' already exists"; fi
if test ! -e meta/desc; then error 2 "File 'meta/desc' missing"; fi

echo "  -> Check out new worktree (branch tarball from $from)..."
run git worktree add $tb -b tarball $from

addcpnt()
{
    local dep=$2
    local depname="${dep##*/}"

    local ref="$(cat $dep/ref 2>/dev/null)"
    if test -z "$ref"; then ref="$(cat $dep/version)"; fi
    echo "  -> Check out $depname new worktree (branch tarball from $ref)..."
    tryrun mkdir -p $tb/deps
    local dst=$tb/$depname
    tryrun git -C ../deps/$depname worktree add $dst.full -b tarball $ref
    tryrun ln -s ../$depname $tb/deps
    if test -e $dep/files; then
        echo "  -> Copy needed files..."
        tryrun mkdir $dst
        while IFS= read -r file; do
            tryrun mkdir -p $dst/$(dirname $file)
            tryrun cp $dst.full/$file $dst/$file
        done < $dep/files
        tryrun mkdir $dst/meta
        tryrun cp $dep/version $dst/meta
    else
        echo "  -> Copy files..."
        tryrun cp -aR $dst.full $dst
    fi
    echo "  -> Remove $depname worktree..."
    tryrun git -C ../deps/$depname worktree remove --force $dst.full
    tryrun git -C ../deps/$depname branch -D tarball
}
echo "  -> Add components..."
cd $tb
loaddeps
foreach cpnt $nb_cpnt addcpnt 0
cd ..

echo "  -> Set up configure & common.mk..."
make -C $tb

echo "  -> Generate README..."
test -e $tb/README && tryrun rm $tb/README
tryrun "$(dirname $0)"/mkreadme > $tb/README

if ! test -e $tb/src/include; then mkdir $tb/src/include; fi

echo " => Create tarball..."
tryrun tar -cJp --owner=0 --group=0 --numeric-owner --exclude=".git"* -f $tb.tar.xz "$tbname"

echo " => Clean up..."
echo "  -> Remove worktree & branch tarball..."
tryrun git worktree remove --force $tb
tryrun git branch -D tarball

echo "done."