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#!/bin/sh
# Copyright (c) 2014-2016 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
DIR=$(dirname "$0")
[ "/${DIR#/}" != "$DIR" ] && DIR=$(dirname "$(pwd)/$0")
echo "Using verify-commits data from ${DIR}"
VERIFIED_ROOT=$(cat "${DIR}/trusted-git-root")
VERIFIED_SHA512_ROOT=$(cat "${DIR}/trusted-sha512-root-commit")
REVSIG_ALLOWED=$(cat "${DIR}/allow-revsig-commits")
HAVE_GNU_SHA512=1
[ ! -x "$(which sha512sum)" ] && HAVE_GNU_SHA512=0
if [ x"$1" = "x" ]; then
CURRENT_COMMIT="HEAD"
else
CURRENT_COMMIT="$1"
fi
if [ "${CURRENT_COMMIT#* }" != "$CURRENT_COMMIT" ]; then
echo "Commit must not contain spaces?" > /dev/stderr
exit 1
fi
VERIFY_TREE=0
if [ x"$2" = "x--tree-checks" ]; then
VERIFY_TREE=1
fi
NO_SHA1=1
PREV_COMMIT=""
INITIAL_COMMIT="${CURRENT_COMMIT}"
while true; do
if [ "$CURRENT_COMMIT" = $VERIFIED_ROOT ]; then
echo "There is a valid path from \"$INITIAL_COMMIT\" to $VERIFIED_ROOT where all commits are signed!"
exit 0
fi
if [ "$CURRENT_COMMIT" = $VERIFIED_SHA512_ROOT ]; then
if [ "$VERIFY_TREE" = "1" ]; then
echo "All Tree-SHA512s matched up to $VERIFIED_SHA512_ROOT" > /dev/stderr
fi
VERIFY_TREE=0
NO_SHA1=0
fi
if [ "$NO_SHA1" = "1" ]; then
export BITCOIN_VERIFY_COMMITS_ALLOW_SHA1=0
else
export BITCOIN_VERIFY_COMMITS_ALLOW_SHA1=1
fi
if [ "${REVSIG_ALLOWED#*$CURRENT_COMMIT}" != "$REVSIG_ALLOWED" ]; then
export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=1
else
export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=0
fi
if ! git -c "gpg.program=${DIR}/gpg.sh" verify-commit "$CURRENT_COMMIT" > /dev/null; then
if [ "$PREV_COMMIT" != "" ]; then
echo "No parent of $PREV_COMMIT was signed with a trusted key!" > /dev/stderr
echo "Parents are:" > /dev/stderr
PARENTS=$(git show -s --format=format:%P $PREV_COMMIT)
for PARENT in $PARENTS; do
git show -s $PARENT > /dev/stderr
done
else
echo "$CURRENT_COMMIT was not signed with a trusted key!" > /dev/stderr
fi
exit 1
fi
# We always verify the top of the tree
if [ "$VERIFY_TREE" = 1 -o "$PREV_COMMIT" = "" ]; then
IFS_CACHE="$IFS"
IFS='
'
for LINE in $(git ls-tree --full-tree -r "$CURRENT_COMMIT"); do
case "$LINE" in
"12"*)
echo "Repo contains symlinks" > /dev/stderr
IFS="$IFS_CACHE"
exit 1
;;
esac
done
IFS="$IFS_CACHE"
FILE_HASHES=""
for FILE in $(git ls-tree --full-tree -r --name-only "$CURRENT_COMMIT" | LC_ALL=C sort); do
if [ "$HAVE_GNU_SHA512" = 1 ]; then
HASH=$(git cat-file blob "$CURRENT_COMMIT":"$FILE" | sha512sum | { read FIRST _; echo $FIRST; } )
else
HASH=$(git cat-file blob "$CURRENT_COMMIT":"$FILE" | shasum -a 512 | { read FIRST _; echo $FIRST; } )
fi
[ "$FILE_HASHES" != "" ] && FILE_HASHES="$FILE_HASHES"'
'
FILE_HASHES="$FILE_HASHES$HASH $FILE"
done
if [ "$HAVE_GNU_SHA512" = 1 ]; then
TREE_HASH="$(echo "$FILE_HASHES" | sha512sum)"
else
TREE_HASH="$(echo "$FILE_HASHES" | shasum -a 512)"
fi
HASH_MATCHES=0
MSG="$(git show -s --format=format:%B "$CURRENT_COMMIT" | tail -n1)"
case "$MSG -" in
"Tree-SHA512: $TREE_HASH")
HASH_MATCHES=1;;
esac
if [ "$HASH_MATCHES" = "0" ]; then
echo "Tree-SHA512 did not match for commit $CURRENT_COMMIT" > /dev/stderr
exit 1
fi
fi
PARENTS=$(git show -s --format=format:%P "$CURRENT_COMMIT")
for PARENT in $PARENTS; do
PREV_COMMIT="$CURRENT_COMMIT"
CURRENT_COMMIT="$PARENT"
break
done
done
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