From f20e664f40be331012811128ce6ab5b0a6bdd8ba Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Mon, 6 Mar 2017 16:13:40 -0500
Subject: [PATCH 1/2] Check gpg version before setting --weak-digest

---
 contrib/verify-commits/gpg.sh            | 18 +++++++++++++++---
 contrib/verify-commits/verify-commits.sh |  2 +-
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/contrib/verify-commits/gpg.sh b/contrib/verify-commits/gpg.sh
index 4342d7bd0..b01e2a6d3 100755
--- a/contrib/verify-commits/gpg.sh
+++ b/contrib/verify-commits/gpg.sh
@@ -19,8 +19,20 @@ else
 	# an attacker could construct a pull-req that results in a commit object that
 	# they've created a collision for. Not the most likely attack, but preventing
 	# it is pretty easy so we do so as a "belt-and-suspenders" measure.
-
-	GPG_RES="$(echo "$INPUT" | gpg --trust-model always --weak-digest sha1 "$@" 2>/dev/null)"
+	GPG_RES=""
+	for LINE in "$(gpg --version)"; do
+		case "$LINE" in
+			"gpg (GnuPG) 1.4.1"*|"gpg (GnuPG) 2.0."*)
+				echo "Please upgrade to at least gpg 2.1.10 to check for weak signatures" > /dev/stderr
+				GPG_RES="$(echo "$INPUT" | gpg --trust-model always "$@" 2>/dev/null)"
+				;;
+			# We assume if you're running 2.1+, you're probably running 2.1.10+
+			# gpg will fail otherwise
+			# We assume if you're running 1.X, it is either 1.4.1X or 1.4.20+
+			# gpg will fail otherwise
+		esac
+	done
+	[ "$GPG_RES" = "" ] && GPG_RES="$(echo "$INPUT" | gpg --trust-model always --weak-digest sha1 "$@" 2>/dev/null)"
 fi
 for LINE in $(echo "$GPG_RES"); do
 	case "$LINE" in
@@ -40,7 +52,7 @@ if ! $VALID; then
 	exit 1
 fi
 if $VALID && $REVSIG; then
-	echo "$INPUT" | gpg --trust-model always "$@" | grep "\[GNUPG:\] \(NEWSIG\|SIG_ID\|VALIDSIG\)" 2>/dev/null
+	echo "$INPUT" | gpg --trust-model always "$@" 2>/dev/null | grep "\[GNUPG:\] \(NEWSIG\|SIG_ID\|VALIDSIG\)"
 	echo "$GOODREVSIG"
 else
 	echo "$INPUT" | gpg --trust-model always "$@" 2>/dev/null
diff --git a/contrib/verify-commits/verify-commits.sh b/contrib/verify-commits/verify-commits.sh
index 55eccf588..cbf59aba9 100755
--- a/contrib/verify-commits/verify-commits.sh
+++ b/contrib/verify-commits/verify-commits.sh
@@ -43,7 +43,7 @@ IS_SIGNED () {
 		export BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG=0
 	fi
 
-	if ! git -c "gpg.program=${DIR}/gpg.sh" verify-commit $1 > /dev/null 2>&1; then
+	if ! git -c "gpg.program=${DIR}/gpg.sh" verify-commit $1 > /dev/null; then
 		return 1;
 	fi
 

From b3ec305f8e298b86507100cf28f9c240a0d2139f Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Mon, 6 Mar 2017 16:14:13 -0500
Subject: [PATCH 2/2] Fix bashisms in verify-commits and always check top
 commit's tree

---
 contrib/verify-commits/trusted-sha512-root-commit |  2 +-
 contrib/verify-commits/verify-commits.sh          | 13 +++++++------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/contrib/verify-commits/trusted-sha512-root-commit b/contrib/verify-commits/trusted-sha512-root-commit
index 189dc215e..c28f50ff7 100644
--- a/contrib/verify-commits/trusted-sha512-root-commit
+++ b/contrib/verify-commits/trusted-sha512-root-commit
@@ -1 +1 @@
-b00ba6251f71fa1edaabdf809514e1bc3c67862e
+f7ec7cfd38b543ba81ac7bed5b77f9a19739460b
diff --git a/contrib/verify-commits/verify-commits.sh b/contrib/verify-commits/verify-commits.sh
index cbf59aba9..40c934144 100755
--- a/contrib/verify-commits/verify-commits.sh
+++ b/contrib/verify-commits/verify-commits.sh
@@ -47,7 +47,8 @@ IS_SIGNED () {
 		return 1;
 	fi
 
-	if [ "$VERIFY_TREE" = 1 ]; then
+	# We set $4 to 1 on the first call, always verifying the top of the tree
+	if [ "$VERIFY_TREE" = 1 -o "$4" = "1" ]; then
 		IFS_CACHE="$IFS"
 		IFS='
 '
@@ -63,9 +64,10 @@ IS_SIGNED () {
 		IFS="$IFS_CACHE"
 
 		FILE_HASHES=""
-		for FILE in $(git ls-tree --full-tree -r --name-only $1 | LANG=C sort); do
+		for FILE in $(git ls-tree --full-tree -r --name-only $1 | LC_ALL=C sort); do
 			HASH=$(git cat-file blob $1:"$FILE" | sha512sum | { read FIRST OTHER; echo $FIRST; } )
-			[ "$FILE_HASHES" != "" ] && FILE_HASHES="$FILE_HASHES"$'\n'
+			[ "$FILE_HASHES" != "" ] && FILE_HASHES="$FILE_HASHES"'
+'
 			FILE_HASHES="$FILE_HASHES$HASH  $FILE"
 		done
 		HASH_MATCHES=0
@@ -86,7 +88,7 @@ IS_SIGNED () {
 	local PARENTS
 	PARENTS=$(git show -s --format=format:%P $1)
 	for PARENT in $PARENTS; do
-		if IS_SIGNED $PARENT $VERIFY_TREE $NO_SHA1; then
+		if IS_SIGNED $PARENT $VERIFY_TREE $NO_SHA1 0; then
 			return 0;
 		fi
 		break
@@ -111,10 +113,9 @@ fi
 DO_CHECKOUT_TEST=0
 if [ x"$2" = "x--tree-checks" ]; then
 	DO_CHECKOUT_TEST=1
-
 fi
 
-IS_SIGNED "$TEST_COMMIT" "$DO_CHECKOUT_TEST" 1
+IS_SIGNED "$TEST_COMMIT" "$DO_CHECKOUT_TEST" 1 1
 RES=$?
 if [ "$RES" = 1 ]; then
 	if ! "$HAVE_FAILED"; then