File: lmodern.preinst

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lmodern 2.004.1-3
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#! /bin/sh -e

PACKAGE=lmodern

CONFIG_FILE_BASE_NAME=10lmodern.cfg
CONFIG_FILE="/etc/texmf/updmap.d/$CONFIG_FILE_BASE_NAME"
TEMP_CONFIG_FILE="$OLD_STATE_DIR/${CONFIG_FILE_BASE_NAME}.tmp"

# Stuff from the old (teTeX 2 times) updmap scheme
OLD_STATE_DIR="/var/lib/$PACKAGE"
SAVED_CONFIG_FILE="$OLD_STATE_DIR/${CONFIG_FILE_BASE_NAME}.saved"
NO_CONFIG_FILE="$OLD_STATE_DIR/admin-wants-no-lmodern.cfg"


# Function to call when upgrading from experimental versions 0.92-{4,5,6}
remove_stuff_from_experimental_versions()
{
    # If ucf is not installed anymore, the data to purge was already
    # removed (along with ucf), in which case there is no problem not
    # running 'ucf --purge'.
    [ -x /usr/bin/ucf ] && ucf --purge "$CONFIG_FILE"

    rm -f "$OLD_STATE_DIR/ucf_should_not_recreate_the_config_file"

    CONFIG_FILE_CRUFT_DIR="$OLD_STATE_DIR/config-file-cruft"
    CONFIG_FILE_CRUFT_SUFFIXES='~ % .bak .dpkg-tmp .dpkg-new .dpkg-old
                                .dpkg-dist'
    for suffix in $CONFIG_FILE_CRUFT_SUFFIXES; do
        rm -f "$CONFIG_FILE_CRUFT_DIR/$CONFIG_FILE_BASE_NAME$suffix"
    done
    [ -d "$CONFIG_FILE_CRUFT_DIR" ] && rmdir "$CONFIG_FILE_CRUFT_DIR"

    return 0
}

# Transition from the (update-)updmap scheme in use with teTeX 2
transition_from_old_updmap_scheme()
{
    # At the end of this block, we should have a $CONFIG_FILE.
    if ! [ -f "$CONFIG_FILE" ]; then
        if [ -f "$SAVED_CONFIG_FILE" ]; then
            # The package was simply removed.
            mv "$SAVED_CONFIG_FILE" "$CONFIG_FILE"
        else
            # The user had intentionally deleted $CONFIG_FILE. Create an empty
            # one with the magic comment.
            # The temporary file trick allows the script to be idempotent
            # because rename(2) is guaranteed to be atomic by POSIX.
            cat > "$TEMP_CONFIG_FILE" <<EndOfEmptyConfigFile
# Don't delete the following pseudo-comment unless you know what you are doing.
# -_- DebPkgProvidedMaps -_-
# This file will *not* be included in updmap.cfg if the lmodern package is
# removed. Please read update-updmap(1) for details.
EndOfEmptyConfigFile
            mv "$TEMP_CONFIG_FILE" "$CONFIG_FILE"
        fi
    fi

    # We have a $CONFIG_FILE, therefore it is safe to remove these files now.
    rm -f "$SAVED_CONFIG_FILE" "$NO_CONFIG_FILE"
    # The directory should be empty by now.
    [ -d "$OLD_STATE_DIR" ] && rmdir "$OLD_STATE_DIR"

    # If the CONFIG_FILE is unchanged, remove it.
    if [ -f "$CONFIG_FILE" ]; then
	cnfmdsum=$(md5sum "$CONFIG_FILE" | cut -d ' ' -f 1)
	if [ "$cnfmdsum" = "77e2ae35bcc1153c4303487472d2bd17" ]; then
	    # We can remove the file as it hasn't been changed.
	    echo "Removing old, unchanged (pseudo-)conffile $CONFIG_FILE"
	    rm -f "$CONFIG_FILE"
	else
	    # The file was changed.
	    # If it does not contain a magic header, we add it.
	    if ! grep -q '^# -_- DebPkgProvidedMaps -_-' "$CONFIG_FILE"; then
	        cat > "$TEMP_CONFIG_FILE" <<EndOfEmptyConfigFile
# Don't delete the following pseudo-comment unless you know what you are doing.
# -_- DebPkgProvidedMaps -_-
# This file will *not* be included in updmap.cfg if the lmodern package is
# removed. Please read update-updmap(1) for details.
EndOfEmptyConfigFile
		cat "$CONFIG_FILE" >> "$TEMP_CONFIG_FILE"
		mv "$TEMP_CONFIG_FILE" "$CONFIG_FILE"
	    fi
	fi
    fi

    return 0
}

# Retrieve the MD5 sum of a conffile from the dpkg database.
#
# $1 -- package name
# $2 -- full (absolute) path to the conffile; this path will be matched
#       against the output of:
#
#         dpkg-query -W -f='${Conffiles}' <package>
#
dpkg_md5sum()
{
    package="$1"
    conffile="$2"

    sum=$(dpkg-query -W -f='${Conffiles}' "$package" \
            | grep -F " $conffile " | cut -d ' ' -f 3)

    if [ -n "$sum" ]; then
        echo "$sum"
        res=0
    else
        echo "Conffile '$conffile' not found in package '$package'" >&2
        res=1
    fi

    return $res
}

move_very_old_map_file_away ()
{
    oldfile=/etc/texmf/dvips/lm.map
    if ! [ -r $oldfile ] ; then
	return 0
    fi
    originalmd5sum=$(dpkg_md5sum lmodern "$oldfile") || exit 1
    installedmd5sum=$(md5sum "$oldfile" |  cut -d ' ' -f 1)
    if [ "$originalmd5sum" = "$installedmd5sum" ] ; then
        echo "Removing obsolete, unchanged conffile $oldfile"
	rm $oldfile
    else
        mkdir -p /etc/texmf/fonts/map/dvips/lm/
        mv $oldfile /etc/texmf/fonts/map/dvips/lm/lm.map.preinst-bak
	echo "
Warning: you appear to have modified $oldfile, but its location
is now obsolete. As this is an upgrade from a very old version, your
file has been saved in /etc/texmf/fonts/map/dvips/lm/lm.map.preinst-bak,
and can be safely deleted. If you want to adapt the lmodern map file,
please make a copy of /usr/share/texmf/fonts/map/dvips/lm/lm.map
and put it into /etc/texmf/fonts/map/dvips/lm/lm.map." >&2
    fi

    return 0
}

config_move ()
{
    mode="$1"
    package="$2"
    oldfile="$3"
    newloc="$4"

    originalmd5sum=$(dpkg_md5sum "$package" "$oldfile") || exit 1

    if ! [ -e "$oldfile" ] ; then
        return 0
    fi
    oldloc=$(dirname "$oldfile")
    installedmd5sum=$(md5sum "$oldfile" |  cut -d ' ' -f 1)

    # Take care of $oldfile
    if [ "$originalmd5sum" = "$installedmd5sum" ] ; then
        echo "Removing obsolete, unchanged conffile $oldfile"
        rm "$oldfile"
    else
        if [ -z "$newloc" ] ; then
            echo "Conffile $oldfile was changed, leaving it at the same place"
        else
            echo "Conffile $oldfile was changed, moving it to new location" \
                "$newloc"
            mkdir -p "$newloc"
            mv "$oldfile" "$newloc"
        fi
    fi

    # Optionally remove the $oldloc directory (depending on $mode)
    case "$mode" in
        remove_dir)
            test -d "$oldloc" && \
                rmdir --ignore-fail-on-non-empty "$oldloc" || true
            ;;
        keep_dir)
            ;;
        *)
            echo "Wrong usage of config_move(): \$1 = '$mode'" >&2
            exit 1
            ;;
    esac

    return 0
}


# If we are upgrading (in the large sense, including the case where the package
# was previously removed-but-not-purged)...
if [ $# -eq 2 ]  && ( [ "$1" = "install" ] || [ "$1" = "upgrade" ] ); then
    # ... from a version tailored for the old update-updmap (where $CONFIG_FILE
    # wasn't allowed to be a conffile)
    if dpkg --compare-versions "$2" le 0.92-7; then
        transition_from_old_updmap_scheme
	move_very_old_map_file_away
    fi
    # ... from an experimental version that used ucf
    #  [ Presumably, very few people installed these versions; they weren't
    #    even uploaded to experimental. At some point, we can assume that all
    #    these people have upgraded lmodern since then, and remove this code. ]
    if dpkg --compare-versions "$2" ge 0.92-4 \
        && dpkg --compare-versions "$2" lt 0.92-7; then
        remove_stuff_from_experimental_versions
    fi
    
    # If we are upgrading from a version v such as 0.92-7 < v < 0.99.3-1, then
    # lm.map is still in /etc/texmf/map/dvips/lm/.
    if dpkg --compare-versions "$2" gt 0.92-7 \
        && dpkg --compare-versions "$2" lt 0.99.3-1; then
	config_move remove_dir lmodern /etc/texmf/map/dvips/lm/lm.map \
            /etc/texmf/fonts/map/dvips/lm
    fi

    # People who installed lmodern 0.92-7 in the same apt run that was doing
    # the teTeX 2 to teTeX 3 upgrade may have this file lying around (see bug
    # #334658).
    rm -f /etc/texmf/dvips/lm.map.dpkg-new

    # lmodern 0.99.3-3 moved lmodern.scale to /etc/X11/fonts/X11R7/Type1/
    # because that was required by X.org, but the latter quickly reverted to
    # the old location /etc/X11/fonts/Type1; so, let's move
    # /etc/X11/fonts/X11R7/Type1/lmodern.scale back to /etc/X11/fonts/Type1 if
    # upgrading from 0.99.3-3.
    if [ "$2" = 0.99.3-3 ]; then
	config_move keep_dir lmodern \
            /etc/X11/fonts/X11R7/Type1/lmodern.scale /etc/X11/fonts/Type1
    fi
    
fi

case "$1" in
    install|upgrade|abort-upgrade)
    ;;

    *)
        echo "preinst called with unknown argument '$1'" >&2
        exit 1
    ;;
esac

#DEBHELPER#

exit 0