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#!/bin/bash
### This script attempts to download the signature file SHA256SUMS.asc from bitcoin.org
### It first checks if the signature passes, and then downloads the files specified in
### the file, and checks if the hashes of these files match those that are specified
### in the signature file.
### The script returns 0 if everything passes the checks. It returns 1 if either the
### signature check or the hash check doesn't pass. If an error occurs the return value is 2
function clean_up {
for file in $*
do
rm "$file" 2> /dev/null
done
}
WORKINGDIR="/tmp/bitcoin"
TMPFILE="hashes.tmp"
SIGNATUREFILENAME="SHA256SUMS.asc"
RCSUBDIR="test/"
BASEDIR="https://bitcoin.org/bin/"
VERSIONPREFIX="bitcoin-core-"
RCVERSIONSTRING="rc"
if [ ! -d "$WORKINGDIR" ]; then
mkdir "$WORKINGDIR"
fi
cd "$WORKINGDIR"
#test if a version number has been passed as an argument
if [ -n "$1" ]; then
#let's also check if the version number includes the prefix 'bitcoin-',
# and add this prefix if it doesn't
if [[ $1 == "$VERSIONPREFIX"* ]]; then
VERSION="$1"
else
VERSION="$VERSIONPREFIX$1"
fi
#now let's see if the version string contains "rc", and strip it off if it does
# and simultaneously add RCSUBDIR to BASEDIR, where we will look for SIGNATUREFILENAME
if [[ $VERSION == *"$RCVERSIONSTRING"* ]]; then
BASEDIR="$BASEDIR${VERSION/%-$RCVERSIONSTRING*}/"
BASEDIR="$BASEDIR$RCSUBDIR"
else
BASEDIR="$BASEDIR$VERSION/"
fi
SIGNATUREFILE="$BASEDIR$SIGNATUREFILENAME"
else
echo "Error: need to specify a version on the command line"
exit 2
fi
#first we fetch the file containing the signature
WGETOUT=$(wget -N "$BASEDIR$SIGNATUREFILENAME" 2>&1)
#and then see if wget completed successfully
if [ $? -ne 0 ]; then
echo "Error: couldn't fetch signature file. Have you specified the version number in the following format?"
echo "[$VERSIONPREFIX]<version>-[$RCVERSIONSTRING[0-9]] (example: "$VERSIONPREFIX"0.10.4-"$RCVERSIONSTRING"1)"
echo "wget output:"
echo "$WGETOUT"|sed 's/^/\t/g'
exit 2
fi
#then we check it
GPGOUT=$(gpg --yes --decrypt --output "$TMPFILE" "$SIGNATUREFILENAME" 2>&1)
#return value 0: good signature
#return value 1: bad signature
#return value 2: gpg error
RET="$?"
if [ $RET -ne 0 ]; then
if [ $RET -eq 1 ]; then
#and notify the user if it's bad
echo "Bad signature."
elif [ $RET -eq 2 ]; then
#or if a gpg error has occurred
echo "gpg error. Do you have the Bitcoin Core binary release signing key installed?"
fi
echo "gpg output:"
echo "$GPGOUT"|sed 's/^/\t/g'
clean_up $SIGNATUREFILENAME $TMPFILE
exit "$RET"
fi
#here we extract the filenames from the signature file
FILES=$(awk '{print $2}' "$TMPFILE")
#and download these one by one
for file in in $FILES
do
wget --quiet -N "$BASEDIR$file"
done
#check hashes
DIFF=$(diff <(sha256sum $FILES) "$TMPFILE")
if [ $? -eq 1 ]; then
echo "Hashes don't match."
echo "Offending files:"
echo "$DIFF"|grep "^<"|awk '{print "\t"$3}'
exit 1
elif [ $? -gt 1 ]; then
echo "Error executing 'diff'"
exit 2
fi
#everything matches! clean up the mess
clean_up $FILES $SIGNATUREFILENAME $TMPFILE
echo -e "Verified hashes of \n$FILES"
exit 0
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