#!/bin/bash
# set -x

test $# -eq 2 || { echo "Usage: $0 <chroot template directory for system libs to create> <LO installation directory>"; exit 1; }

# No provision for spaces or other weird characters in pathnames. So sue me.

CHROOT=$1
INSTDIR=$2

test -d "$INSTDIR" || { echo "No such directory: $INSTDIR"; exit 1; }

mkdir -p $CHROOT || exit 1

# Resolve the real paths, in case they are relative and/or symlinked.
# INSTDIR_LOGICAL will contain the logical path, if there are symlinks,
# while INSTDIR is the physical one. Both will most likely be the same,
# except on systems that have symlinks in the path. We must create
# both paths (if they are different) inside the jail, hence we need both.
CHROOT=`cd $CHROOT && /bin/pwd`
INSTDIR_LOGICAL=`cd $INSTDIR && /bin/pwd -L`
INSTDIR=`cd $INSTDIR && /bin/pwd -P`

cd / || exit 1

(
# Produce a list of file names, one per line, that will be copied
# into the template tree of system files for the chroot jails.

# First essential files and shared objects
find etc/ld.so.* \
     lib/ld-* lib64/ld-* \
     lib/libnss_* lib64/libnss_* lib/*/libnss_* \
     lib/libresolv* lib64/libresolv* lib/*/libresolv* \
     var/cache/fontconfig \
     etc/fonts \
     usr/lib/locale/en_US.utf8 \
     usr/lib/locale/C.UTF-8 \
     usr/lib/locale/locale_archive \
     usr/lib/*/nss/*.so \
     usr/lib/*/libsqlite* \
     usr/share/zoneinfo/* \
     usr/share/liblangtag \
     usr/share/hyphen \
	 -type f 2>/dev/null

find etc/fonts \
     lib/ld-* lib64/ld-* \
     lib/libnss_* lib64/libnss_* lib/*/libnss_* \
     lib/libresolv* lib64/libresolv* lib/*/libresolv* \
     usr/lib/*/libsqlite* \
	-type l 2>/dev/null

# Go through the LO shared objects and check what system libraries
# they link to.
find $INSTDIR -name 'xpdfimport' |
while read file; do
    ldd $file 2>/dev/null
done |
grep -v dynamic | cut -d " " -f 3 | grep -E '^(/lib|/usr)' | sort -u | sed -e 's,^/,,'

) |

# Can't use -l because then symlinks won't be handled well enough.
# This will now copy the file a symlink points to, but whatever.
cpio -p -d -L $CHROOT

# Link the dynamic files, replacing any existing.
rm -f $CHROOT/etc/copied
for file in hosts nsswitch.conf resolv.conf passwd group host.conf timezone localtime
do
    # echo "Linking/Copying /etc/$file"
    # Prefer hard-linking, fallback to just copying (do *not* use soft-linking because that would be relative to the jail).
    # When copying, we must make sure that we copy the source and not a symlink. Otherwise, the source won't be accessible from the jail.
    # In addition, we flag that at least one file is copied by creating the 'copied' file, so that we do check for updates.
    ln -f `realpath /etc/$file` $CHROOT/etc/$file || (cp --dereference --preserve=all /etc/$file $CHROOT/etc/$file && touch $CHROOT/etc/copied) || echo "Failed to link or copy $file"
done

# Link dev/random and dev/urandom to ../tmp/dev/.
# The jail then creates the random device nodes in its /tmp/dev/.
mkdir -p $CHROOT/dev
mkdir -p $CHROOT/tmp/dev
for file in random urandom
do
    # This link is relative anyway, so can be soft.
    ln -f ../tmp/dev/$file $CHROOT/dev/ 2> /dev/null || ln -f -s ../tmp/dev/$file $CHROOT/dev/ || echo "Failed to link dev/$file"
done

# Create a relative symbolic link within systemplate that points from
# the path of $INSTDIR (as seen from the jail as an absolute path)
# to the /lo path, where the instdir of LO will really reside.
mkdir -p $CHROOT/lo
# In case the original path is different from
for path in $INSTDIR $INSTDIR_LOGICAL
do
    # Create a soft-link, as it's a relative directory path (can't be a hard-link).
    INSTDIR_PARENT="$(dirname "$CHROOT/$path")"
    mkdir -p $INSTDIR_PARENT
    ln -f -s `realpath --relative-to=$INSTDIR_PARENT $CHROOT/lo` $CHROOT/$path
done

# /usr/share/fonts needs to be taken care of separately because the
# directory time stamps must be preserved for fontconfig to trust
# its cache.

cd $CHROOT || exit 1

mkdir -p usr/share || exit 1
cp -r -p -L /usr/share/fonts usr/share

if [ -h usr/share/fonts/ghostscript ]; then
    mkdir usr/share/ghostscript || exit 1
    cp -r -p -L /usr/share/ghostscript/fonts usr/share/ghostscript
fi

# Remove obsolete & unused bitmap fonts
find usr/share -name '*.pcf' | xargs rm -f
find usr/share -name '*.pcf.gz' | xargs rm -f

# Debugging only hackery to avoid confusion.
if test "z$ENABLE_DEBUG" != "z" -a "z$HOME" != "z"; then
    echo "Copying development users's fonts into systemplate"
    mkdir -p $CHROOT/$HOME
    test -d $HOME/.fonts && cp -r -p -L $HOME/.fonts $CHROOT/$HOME
fi

exit 0