Fix zfs-dkms uninstall/update

Modern versions of dkms cleanup the build directory after installing.
This resulted in 'dkms uninstall' never running because the check
added by commit 866c162 which verifies the existance of the
zfs.release build product would never be true.

This patch resolves the issue by updating the conditional to check
in the explicitly installed zfs_config.h file for the version.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3862

diff --git a/rpm/generic/zfs-dkms.spec.in b/rpm/generic/zfs-dkms.spec.in
index a3388225cd762d1e7f3a2ea1b31ca01d53089816..e432bc4142dba5719a161c7e0b4465542fc2d5d8 100644 (file)
--- a/rpm/generic/zfs-dkms.spec.in
+++ b/rpm/generic/zfs-dkms.spec.in
@@ -62,12 +62,13 @@ echo -e "support or upgrade DKMS to a more current version."
 exit 1
 
 %preun
-# Only remove the modules if they are for this %{version}-%{release}.  A
-# package upgrade can replace them if only the %{release} is changed.
-RELEASE="/var/lib/dkms/%{module}/%{version}/build/%{module}.release"
-if [ -f $RELEASE ] && [ `cat $RELEASE`%{?dist} = "%{version}-%{release}" ]; then
+CONFIG_H="/var/lib/dkms/%{module}/%{version}/*/*/%{module}_config.h"
+SPEC_META_ALIAS="@PACKAGE@-@VERSION@-@RELEASE@"
+DKMS_META_ALIAS=`cat $CONFIG_H 2>/dev/null |
+    awk -F'"' '/META_ALIAS/ { print $2; exit 0 }'`
+if [ "$SPEC_META_ALIAS" = "$DKMS_META_ALIAS" ]; then
     echo -e
-    echo -e "Uninstall of %{module} module (version %{version}) beginning:"
+    echo -e "Uninstall of %{module} module ($SPEC_META_ALIAS) beginning:"
     dkms remove -m %{module} -v %{version} --all --rpm_safe_upgrade
 fi
 exit 0