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|
#!/bin/bash
#
# Simple Debian image downloader.
#
# Parameters
BASENAME="`basename $0`"
# Syntax
if [ -z "$1" ]; then
echo "usage: $BASENAME <image-url>"
exit 1
fi
# Arguments
URL="$1"
BASE="`dirname $URL`"
RATE="$2"
FILENAME="`basename $URL`"
SIGN="sign"
HASHES="SHA256SUMS SHA512SUMS"
# Fetch hashes
for hash in $HASHES; do
wget -c $BASE/$hash
wget -c $BASE/$hash.$SIGN
done
# Determine transfer method
if echo $FILENAME | grep -qe '.jigdo$'; then
# Check for jigdo
if ! which jigdo-lite &> /dev/null; then
echo "Please install jigdo-file"
exit 1
fi
# Get the image using jigdo
jigdo-lite $URL
# Fix filename
FILENAME="`basename $FILENAME .jigdo`.iso"
elif echo $FILENAME | grep -qe '.zsync$'; then
# Check for zsync
if ! which zsync &> /dev/null; then
echo "Please install zsync"
exit 1
fi
# Get the image using zsync
zsync $URL
# Fix filename
FILENAME="`basename $FILENAME .zsync`"
else
# Check for wget
if ! which wget &> /dev/null; then
echo "Please install wget"
exit 1
fi
# Set rate limit
if [ ! -z "$RATE" ]; then
LIMIT="--limit-rate=$RATE"
fi
# Get the image using wget
wget -c $LIMIT $URL
fi
# Check hashes
for hash in $HASHES; do
if [ -e "$hash" ]; then
echo "Checking $FILENAME against $hash file..."
check="`echo $hash | tr '[:upper:]' '[:lower:]' | sed -e 's/s$//'`"
grep -e "$FILENAME$" $hash | $check -c
else
echo "$BASENAME: cannot check $hash: file not found, skipping"
fi
done
# Check hash integrity
for hash in $HASHES; do
if [ -e "$hash" ]; then
echo "Checking $hash.$SIGN..."
gpg --verify $hash.$SIGN
fi
done
|
