#!/bin/bash

set -u
set -e
set -o pipefail

export SCRIPTVARS=/srv/ftp-master.debian.org/dak/config/debian/vars
. $SCRIPTVARS

# Tarball to read, compressed with gzip
INPUT="${1:?"Usage: $0 filename"}"

# Regular expression used to validate tag lines
CHECKRE='^([a-z0-9A-Z.+-]+[[:space:]]+Tag)?[[:space:]]+[A-Za-z0-9:. ,{}+-]+$'

# This must end with /
TARGET=/srv/ftp-master.debian.org/scripts/external-overrides/

# Read the main directory from the tarball
DIR="`tar ztf \"$INPUT\" | tail -n 1 | cut -d/ -f1`"

# Create temporary files where to store the validated data
umask 002
OUTMAIN="`mktemp \"$TARGET\"tag.new.XXXXXX`"
OUTCONTRIB="`mktemp \"$TARGET\"tag.contrib.new.XXXXXX`"
OUTNONFREE="`mktemp \"$TARGET\"tag.non-free.new.XXXXXX`"

# If we fail somewhere, cleanup the temporary files
cleanup() {
        rm -f "$OUTMAIN"
        rm -f "$OUTCONTRIB"
        rm -f "$OUTNONFREE"
}
trap cleanup EXIT

# Extract the data into the temporary files
tar -O -zxf "$INPUT" "$DIR"/tag > "$OUTMAIN"
tar -O -zxf "$INPUT" "$DIR"/tag.contrib > "$OUTCONTRIB"
tar -O -zxf "$INPUT" "$DIR"/tag.non-free > "$OUTNONFREE"

# check temporary files for invalid contents
status=0
grep -vq -E "$CHECKRE" "$OUTMAIN" "$OUTCONTRIB" "$OUTNONFREE" || status=$?
# checking just $? != 0 is not enough. grep can return 2 on other errors.
if [ $status != 1 ]; then
        echo "Aborting automatic import (invalid data found)." >&2
        exit 1
fi

# Move the data to the final location
mv "$OUTMAIN"           "$TARGET"tag
mv "$OUTCONTRIB"        "$TARGET"tag.contrib
mv "$OUTNONFREE"        "$TARGET"tag.non-free

chmod 644 "$TARGET"tag "$TARGET"tag.contrib "$TARGET"tag.non-free

(cd "$TARGET" \
  && dak external-overrides import unstable main Tag <tag \
  && dak external-overrides import unstable contrib Tag <tag.contrib \
  && dak external-overrides import unstable non-free Tag <tag.non-free)
dak external-overrides copy unstable testing

trap - EXIT

exit 0