#!/bin/sh

# This command updates the spamassassin configuration; tests the new
# configuration; then moves the updated configuration in place

set -e

TMPDIR=$(mktemp -d);

HOSTNAME=$(hostname);

if [ "$HOSTNAME" = "buxtehude" ]; then
    BASEDIR="/org/bugs.debian.org"
    USERCONF="bugs/user_prefs";
elif [ "$HOSTNAME" = "bendel" ]; then
    BASEDIR="/var/list/.etc";
    USERCONF="lists/user_prefs";
else
    echo "Unknown hostname '$HOSTNAME'";
    exit 1;
fi;

SACONFIG="$BASEDIR/spamassassin_config";

if [ -e "$SACONFIG/.update_spamassassin" ] && kill -0 $(cat "$SACONFIG/.update_spamassassin") >/dev/null 2>&1; then
    echo "Another update_spamassassin appears to be running"
    exit 1;
else
    echo $$ > "$SACONFIG/.update_spamassassin";
fi;

remove_pidfile() {
    rm -f "$SACONFIG/.update_spamassassin"
}

OLDDIR="$(pwd)";
cd "$SACONFIG";
git fetch --all >/dev/null || exit 0;
REMOTE_BRANCH="$(git status --porcelain --branch|grep '^##'|sed 's/.*\.\.\.//')";
CURRENT_HEAD="$(git rev-parse HEAD)"
REMOTE_BRANCH_HEAD="$(git rev-parse "$REMOTE_BRANCH")"
cd "$OLDDIR";
## there aren't any updates, stop here.
if [ "$REMOTE_BRANCH_HEAD" = "$CURRENT_HEAD" ]; then
    remove_pidfile;
    exit 0;
fi;
trap remove_pidfile 0;

FAILUREMESSAGE="";
report_failure () {
    # Hrm; a previous update failed; don't report again until the file
    # is removed or it's more than a day old
    if [ -e "$SACONFIG/failed_update" ] &&
	       [ $(($(date +%s) - $(stat -c '%Y' "$SACONFIG/failed_update"))) -lt 86400 ];  then
        rm -rf "$TMPDIR";
        remove_pidfile;
	    exit 0;
    fi;
    echo "$FAILUREMESSAGE" > "$SACONFIG/failed_update"
    echo "$FAILUREMESSAGE";
    cat - <<EOF;

update_spamassassin will only report this error once a day, and
updates will not occur until this is fixed.

Please fix the problem and then remove
$SACONFIG/failed_update
EOF
    remove_pidfile;
    rm -rf "$TMPDIR";
    exit 1;
}

cp -ar $SACONFIG $TMPDIR/.;
OLDDIR="$(pwd)";
cd $TMPDIR/spamassassin_config;
if ! git merge --quiet --ff-only $REMOTE_BRANCH; then
    FAILUREMESSAGE="The update from $REMOTE_BRANCH to $REMOTE_BRANCH_HEAD\nis not a fast-forward\n\n"
    report_failure;
fi;

if ! spamassassin -p $TMPDIR/spamassassin_config/$USERCONF --lint > $TMPDIR/sa_lint 2>&1; then
    FAILUREMESSAGE="$(echo -e 'spamassassin -p $TMPDIR/spamassassin_config/$USERCONF --lint\nfailed with\n'| cat - $TMPDIR/sa_lint)";
    report_failure
fi;
cd "$SACONFIG":
git merge --ff-only $REMOTE_BRANCH --quiet;
trap - 0
remove_pidfile
rm -rf "$TMPDIR"

if [ "$HOSTNAME" = "buxtehude" ]; then
    touch /home/debbugs/.spamassassin/user_prefs
elif [ "$HOSTNAME" = "bendel" ]; then
    # do nothing
    true;
else
    echo "Unknown hostname '$HOSTNAME'";
    exit 1;
fi;


exit 0;