Write the latest change_id on migration commit

The previous script wrote a lot of change_id on the migration commit
message, and that was unreadable. Developers needed to change the
message by hands for showing the latest change_id for each migrated
module. That was boring.

This patch makes the script write the latest change_id like
 * run_tempest.sh: I55311cff4dea1f6c5adaa2a6d51eeee2f6cc71ea
 * run_tests.sh: I55311cff4dea1f6c5adaa2a6d51eeee2f6cc71ea

Change-Id: I7ce8e7b911c97ad7757a886f781341cce74c5307

1 files changed, 4 insertions, 11 deletions

diff --git a/tools/migrate_from_tempest.sh b/tools/migrate_from_tempest.sh
index acafcd6..d0c5b96 100755
--- a/tools/migrate_from_tempest.sh
+++ b/tools/migrate_from_tempest.sh
@@ -49,18 +49,11 @@ git clone $TEMPEST_GIT_URL $tmpdir
 cd $tmpdir
 
 for file in $files; do
-    # get only commits that touch our files
-    commits="$commits $(git log --format=format:%h --no-merges --follow -- $file)"
-    # then their merge commits - which works fina since we merge commits
-    # individually.
-    merge_commits="$merge_commits $(git log --format=format:%h --merges --first-parent -- $file)"
+    # Get the latest change-id for each file
+    change_id=`git log -n1 --grep "Change-Id: " -- $file | grep "Change-Id: " | awk '{print $2}'`
+    CHANGE_LIST=`echo -e "$CHANGE_LIST\n * $file: $change_id"`
 done
 
-pattern="\n$(echo $commits $merge_commits | sed -e 's/ /\\|/g')"
-
-# order them by filtering each one in the order it appears on rev-list
-SHA1_LIST=$(git rev-list --oneline HEAD | grep $pattern)
-
 # Move files and commit
 cd -
 file_list=''
@@ -88,4 +81,4 @@ rm -rf $tmpdir
 commit_message="Migrated $file_list from tempest"
 pre_list=$"This migrates the above files from tempest. This includes tempest commits:"
 post_list=$"to see the commit history for these files refer to the above sha1s in the tempest repository"
-git commit -m "$commit_message" -m "$pre_list" -m "$SHA1_LIST" -m "$post_list"
+git commit -m "$commit_message" -m "$pre_list" -m "$CHANGE_LIST" -m "$post_list"