From 1eee2c7b278d476df3134113476e9f665f278b86 Mon Sep 17 00:00:00 2001
From: Rich Ercolani <214141+rincebrain@users.noreply.github.com>
Date: Thu, 8 Apr 2021 17:37:51 -0400
Subject: [PATCH] Added check for broken alien version

Added a check for alien 8.95.{1,2,3}, which is known to fail to
generate debs 100% of the time, and instead print out a message
informing the developer that it's known to be broken and linking
them to more information.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #11848
Closes #11850
---
 config/deb.am       | 14 +++++++++++++-
 config/zfs-build.m4 |  6 ++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/config/deb.am b/config/deb.am
index 4ed3c17aa6..cdbdbecb35 100644
--- a/config/deb.am
+++ b/config/deb.am
@@ -14,7 +14,19 @@ deb-local:
 	"*** package for your distribution which provides ${ALIEN},\n" \
 	"*** re-run configure, and try again.\n"; \
 		exit 1; \
-	fi)
+	fi; \
+        if test "${ALIEN_MAJOR}" = "8" && \
+           test "${ALIEN_MINOR}" = "95"; then \
+        if test "${ALIEN_POINT}" = "1" || \
+           test "${ALIEN_POINT}" = "2" || \
+           test "${ALIEN_POINT}" = "3"; then \
+                /bin/echo -e "\n" \
+        "*** Installed version of ${ALIEN} is known to be broken;\n" \
+        "*** attempting to generate debs will fail! See\n" \
+        "*** https://github.com/openzfs/zfs/issues/11650 for details.\n"; \
+                exit 1; \
+        fi; \
+        fi)
 
 deb-kmod: deb-local rpm-kmod
 	name=${PACKAGE}; \
diff --git a/config/zfs-build.m4 b/config/zfs-build.m4
index cd5996c042..cee5c87e77 100644
--- a/config/zfs-build.m4
+++ b/config/zfs-build.m4
@@ -437,6 +437,9 @@ AC_DEFUN([ZFS_AC_ALIEN], [
 	AC_MSG_CHECKING([whether $ALIEN is available])
 	AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 		ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
+		ALIEN_MAJOR=$(echo ${ALIEN_VERSION} | $AWK -F'.' '{ print $[1] }')
+		ALIEN_MINOR=$(echo ${ALIEN_VERSION} | $AWK -F'.' '{ print $[2] }')
+		ALIEN_POINT=$(echo ${ALIEN_VERSION} | $AWK -F'.' '{ print $[3] }')
 		HAVE_ALIEN=yes
 		AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 	],[
@@ -447,6 +450,9 @@ AC_DEFUN([ZFS_AC_ALIEN], [
 	AC_SUBST(HAVE_ALIEN)
 	AC_SUBST(ALIEN)
 	AC_SUBST(ALIEN_VERSION)
+	AC_SUBST(ALIEN_MAJOR)
+	AC_SUBST(ALIEN_MINOR)
+	AC_SUBST(ALIEN_POINT)
 ])
 
 dnl #