Build "file" and "libmagic" for use in Travis CI.

libmagic.sh

#!/bin/bash

# Build "file" binary and "libmagic" library for use in Travis CI.

# Note: All relevant environment variables are set during the Travis CI run,
#       see the following for details: https://github.com/kwilczynski/ruby-magic

set -e
set -o pipefail

export PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:${PATH}

# Avoid the configuration file questions ...
cat <<EOF | tee /etc/apt/apt.conf.d/99apt &>/dev/null
DPkg::options { "--force-confdef"; "--force-confnew"; }
EOF

# Disable need for user interaction ...
export DEBIAN_FRONTEND=noninteractive
export DEBCONF_NONINTERACTIVE_SEEN=true

# Clean up before building ...
rm -Rf file-${VERSION} file-${VERSION}.tar.gz &> /dev/null

# Update package repositories ...
apt-get update &> /dev/null

# Install needed build time dependencies ...
apt-get install --force-yes -y \
  curl             \
  git              \
  mercurial        \
  make             \
  bison            \
  flex             \
  build-essential  \
  autoconf         \
  automake         \
  autotools-dev    \
  libltdl-dev      \
  libtool          \
  libtool-doc &> /dev/null

# Remove existing "libmagic-dev" package.
apt-get remove --purge --force-yes -y libmagic-dev &> /dev/null

# Clean up unneeded packages ...
for action in autoremove autoclean clean; do
  apt-get --force-yes -y $action &>/dev/null
done

# Download source code.
if ! curl -s ftp://ftp.astron.com/pub/file/file-${VERSION}.tar.gz > file-${VERSION}.tar.gz; then
  # Try download from a mirror.
  curl -s http://ftp.clfs.org/pub/clfs/conglomeration/file/file-${VERSION}.tar.gz > file-${VERSION}.tar.gz
fi

# Validate SHA1 checksum ...
echo "$SHA1 *file-${VERSION}.tar.gz" | sha1sum -c

# Unpack source code.
tar -zxf file-${VERSION}.tar.gz

pushd file-${VERSION} &> /dev/null

# Remove surplus file, often left behind. But version "5.09" will not re-generate ...
if [[ $VERSION != "5.09" ]]; then
  rm -f src/magic.h
fi

# Version "5.14" of "libmagic" is very buggy, download patch ...
if [[ $VERSION == "5.14" ]]; then
  PATCH_URL="https://gist.githubusercontent.com/kwilczynski/6583179/raw/8c5fbac07472a0a4b68d4028fc9031647ba50876/file-5.14.diff"
  PATCH_LEVEL=1
fi

# Another buggy release, apply patch.
if [[ $VERSION == "5.18" ]]; then
  PATCH_URL="https://gist.githubusercontent.com/kwilczynski/9925996/raw/483a877749c925a8dcc068de8e3ce5b92f5ea826/338-341-342.diff"
  PATCH_LEVEL=1
fi

if [[ -n $PATCH_URL ]]; then
  curl -L -s $PATCH_URL > patch.diff

  for option in '--dry-run -s -i' '-i'; do
      if ! patch -l -t -p${PATCH_LEVEL} $option patch.diff; then
          break
      fi
  done
fi

# Build "file" and "libmagic" ...
for action in clean distclean; do 
  make $action || true
done

libtoolize
aclocal
autoheader
automake --add-missing
autoconf

./configure --prefix=/usr --enable-fsect-man5

if [[ $? != 0 ]]; then
  $CC --version
  cat config.log
  declare -p
  exit $?
fi

make -j 4
make install

# Make sure to update dynamic libraries cache.
ldconfig

popd &> /dev/null

# Clean up after building ...
rm -Rf file-${VERSION} file-${VERSION}.tar.gz &> /dev/null