[build] Allow OBS builds without explicit version tag

The mce-dev version information is recorded in several files. To keep
these in sync, there is a script that will cause rpm builds to fail unless
all of the places have the same version.

While this is good for making sure releases do not end up using out of
sync version numbers, it also makes it impossible to do builds in OBS
without creating explicit version tag.

The same way as mce itself already does, relax the version checking for
spec file so that versions constructed from matching version + extra git
hash identification are also accepted.

verify_version

@@ -8,23 +8,34 @@ PC_VERS=$(grep '^Version:' $PC_PATH |sed -e 's/^.*:[[:space:]]*//')
 DEB_PATH=debian/changelog
 DEB_VERS=$(head -1 $DEB_PATH | sed -e 's/^.*(//' -e 's/).*$//')
 
-SPEC_PATH=${RPM_SOURCE_DIR:-rpm}/${RPM_PACKAGE_NAME:-mce-headers}.spec
-SPEC_VERS=$(grep '^Version:' $SPEC_PATH |sed -e 's/^.*:[[:space:]]*//')
+RPM_PATH=${RPM_SOURCE_DIR:-rpm}/${RPM_PACKAGE_NAME:-mce-headers}.spec
+RPM_VERS=$(grep '^Version:' $RPM_PATH |sed -e 's/^.*:[[:space:]]*//')
+
+# Remove initial part of rpm version  that equals with version from pkgconfig
+RPM_XTRA=${RPM_VERS#$PC_VERS}
+# From that remove initial part that equals with version from spec-file
+RPM_XTRA=${RPM_XTRA#$RPM_VERS}
+# If the result is non-empty string, then OBS is doing
+# delta-after-matching-tag kind of build, which is ok.
+# But empty string means that spec and Makefile are completely
+# out of sync, which is bad.
 
 RES=0
 
-
 if [ "$DEB_VERS" != "$PC_VERS" ]; then
   echo >&2 "$PC_PATH $PC_VERS vs $DEB_PATH $DEB_VERS"
   RES=1
 fi
 
-if [ "$SPEC_VERS" != "$PC_VERS" ]; then
-  echo >&2 "$PC_PATH $PC_VERS vs $SPEC_PATH $SPEC_VERS"
-  RES=1
+if [ "$RPM_VERS" != "$PC_VERS" ]; then
+  if [ -z "$RPM_XTRA" ]; then
+    echo >&2 "$PC_PATH $PC_VERS vs $RPM_PATH $RPM_VERS"
+    RES=1
+  else
+    echo "(ignoring patch level in spec file: $RPM_XTRA)"
+  fi
 fi
 
-
 if [ $RES != 0 ]; then
   echo >&2 "Conflicting package versions"
 fi