#!/bin/sh

# Script to generate a tarball
# We use git to output a tree. But we also want to build the user documentation
# and put that in the tarball, so that nobody needs to have doxygen installed
# to build it.
# Outputs to $FISH_ARTEFACT_PATH or ~/fish_built by default

# Exit on error
set -e

# We wil generate a tarball with a prefix "fish-VERSION"
# git can do that automatically for us via git-archive
# but to get the documentation in, we need to make a symlink called "fish-VERSION"
# and tar from that, so that the documentation gets the right prefix

# We need GNU tar as that supports the --mtime option
# BSD tar supports --mtree but keeping them in sync sounds too hard
TAR=notfound
for try in tar gtar gnutar; do
  if $try -Pcf /dev/null --mtime now /dev/null >/dev/null 2>&1; then
    TAR=$try
    break
  fi
done

if [ "$TAR" = "notfound" ]; then
  echo 'No suitable tar (supporting --mtime) found as tar/gtar/gnutar in PATH'
  exit 1
fi

# Get the current directory, which we'll use for symlinks
wd="$PWD"

# Get the version from git-describe
VERSION=`git describe --dirty 2>/dev/null`

# The name of the prefix, which is the directory that you get when you untar
prefix="fish-$VERSION"

# The path where we will output the tar file
# Defaults to ~/fish_built
path=${FISH_ARTEFACT_PATH:-~/fish_built}/$prefix.tar

# Clean up stuff we've written before
rm -f "$path" "$path".gz

# git starts the archive
git archive --format=tar --prefix="$prefix"/ HEAD > "$path"

# tarball out the documentation, generate a configure script and version file
autoreconf --no-recursive
./configure --with-doxygen
make doc share/man
echo $VERSION > version

PREFIX_TMPDIR=`mktemp -d`
cd $PREFIX_TMPDIR

ln -s "$wd" "$prefix"
TAR_APPEND="$TAR --append --file=$path --mtime=now --owner=0 --group=0 --mode=g+w,a+rX"
$TAR_APPEND --no-recursion "$prefix"/user_doc
$TAR_APPEND "$prefix"/user_doc/html "$prefix"/share/man
$TAR_APPEND "$prefix"/version
$TAR_APPEND "$prefix"/configure "$prefix"/config.h.in
rm "$prefix"/version
unlink "$prefix"

cd -
rmdir $PREFIX_TMPDIR

# gzip it
gzip "$path"

# Output what we did, and the sha1 hash
echo "Tarball written to $path".gz
openssl dgst -sha256 "$path".gz