[dpdk-stable] [RFC stable-scripts] 1-import: don't filter commits for later releases that fix backported patches

[Luca Boccassi <bluca@debian.org>]

A patch might fix a commit in a later release and so it is skipped. But
that commit might have been backported in the past, so skipping the
patch is wrong.
Rework the list pruning to take this case into account.

Signed-off-by: Luca Boccassi <bluca@debian.org>
---
Tested and seems to be working fine. Slows down by a few seconds the
runtime, but it's bearable and I'm sure it can be optimised, but it's
a starting point.
More testing would be very welcome.

 1-import | 39 ++++++++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/1-import b/1-import
index 05dfdf0..9f03c53 100755
--- a/1-import
+++ b/1-import
@@ -28,18 +28,35 @@ import_one_commit()
 if [ "$PRUNE_COMMITS" = "yes" ]
 then
 	get_stable_release
-	# need to update it in 2021!
-	for _major in {16..20}
+	tmp_list=$PWD/$stable_release/tmp_list
+	rm -f $tmp_list
+
+	pushd $STABLE_DIR &>/dev/null
+	log=$($GIT log v${RTE_VER_MAJOR}..v$last_release)
+	while read line
 	do
-		for _minor in {02..11..3}
-		do
-			if verlte $stable_release $_major.$_minor
-			then
-				sed -i "/($_major.$_minor (partially.*\$/d" $commit_list
-				sed -i "/($_major.$_minor)\$/d" $commit_list
-			fi
-		done
-	done
+		# Get the id of the commit being fixed, for the first check
+		id=$(echo $line | awk '{print $2}')
+		fixes=$($GIT log --format='%b' -1 $id | sed -n 's,^ *\([Ff]ixes\|[Rr]everts\): *\([0-9a-f]*\).*,\2,p')
+
+		# Was stable CC'ed without a Fixes line? If so select it just in case
+		if echo $line | grep -q "(N/A)"
+		then
+			echo $line >> $tmp_list
+		# Is the patch fixing a commit that was part of this stable release?
+		# If so select it
+		elif verlte `echo $line | sed "s/.*(\([0-9][0-9].[0-9][0-9]\).*)/\1/"` $stable_release
+		then
+			echo $line >> $tmp_list
+		# Was the commit (which might be only in a subsequent release)
+		# that the patch "fixes" backported? If so select it
+		elif test -n fixes && echo $log | grep -q -e "backported from commit $fixes" -e "upstream commit $fixes"
+		then
+			echo $line >> $tmp_list
+		fi
+	done < $commit_list
+	popd &>/dev/null
+	mv $tmp_list $commit_list
 fi
 
 if [ "$GIT_AM_PAUSE_ON_FAIL" = "yes" ]
-- 
2.18.0