#!/bin/sh
#
# TLSHOT - make a package from the current native TeX Live installation.
#

# Copyright (c) 2012, Sébastien Boillod <sbb at tuxfamily dot org>.
# 
# Permission to use copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
# 
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
# IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE

snapvrs () {
    ls -1 "/var/log/packages/$1" 2>/dev/null | \
        awk -F- -v s="abcdefghijklmnopqrstuvwxyz" \
            '($2 ~ /[a-z]$/){sub(/[0-9]+/,"",$2);l=substr(s,index(s,$2)+1,1)}
            END{print "'"$1"'" ((l"") ? l : "a")}'
}

export LC_ALL="C"
umask 022
set -e
tl="$(ls -l /opt/texlive | awk '{print $NF}')"
echo "Packaging /opt/$tl..."

root="$(mktemp -d /opt/pkg-XXXXXX)"
mkdir -p "$root/opt" "$root/usr/sbin" "$root/etc/profile.d" "$root/install"
ln -s "$tl" "$root/opt/texlive"
cp /usr/sbin/tlmgr "$root/usr/sbin"
cp /etc/profile.d/texlive.*h "$root/etc/profile.d"
chmod +x "$root/etc/profile.d"/* "$root/usr/sbin"/*
cat >"$root/install/slack-desc" <<EOF
       |-----handy-ruler------------------------------------------------------|
texlive: texlive (native TeX Live distribution)
texlive:
texlive: This is a snapshot of the current native TeX Live installation.
texlive:
texlive:
texlive:
texlive:
texlive:
texlive:
texlive:
texlive:
EOF
cd "$root"
# The installation might be *huge*. That's why we just move it
# in the FS (rename) instead of copying it.
mv "/opt/$tl" "$root/opt"
if ! /sbin/makepkg -l y -c n "${TMPDIR:-"/tmp/"}/$(snapvrs "$tl")-i386-1.txz"; then
    mv "$root/opt/$tl" /opt # ^^^ we ALWAYS move back the Tex Live.
else
    mv "$root/opt/$tl" /opt
fi
rm -rf "$root"

# EoF