Generate the commit message

update_libvpx.sh

 #!/bin/bash -e
 #
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This tool is used to update libvpx source code with the latest git
 # repository.
 #
 # Make sure you run this in a git checkout of deps/third_party/libvpx!
@@ skipping 37 matching lines @@
 git clone $GIT_REPO .
 
 # Switch the content to the latest git repo.
 git checkout -b tot $GIT_BRANCH
 
 add="$(git diff-index --diff-filter=A $prev_hash | \
 tr -s [:blank:] ' ' | cut -f6 -d\ )"
 delete="$(git diff-index --diff-filter=D $prev_hash | \
 tr -s [:blank:] ' ' | cut -f6 -d\ )"
 
+# Get the current commit hash.
+hash=$(git log -1 --format="%H")
+
+# README reminder.
+echo "Update README.chromium:"
+echo "==============="
+echo "Date: $(date +"%A %B %d %Y")"
+echo "Branch: master"
+echo "Commit: $hash"
+echo "==============="
+echo ""
+
+# Commit message header.
+echo "Commit message:"
+echo "==============="
+echo "libvpx: Pull from upstream"
+echo ""
+

[Tom Finegan, 2015/03/10 22:32:05]

could have been a heredoc:

cat << EOF
everything you echo
EOF

And then no echo's, but I don't really care. :)

 # Output the current commit hash.
-hash=$(git log -1 --format="%H")
 echo "Current HEAD: $hash"
+echo ""
 
 # Output log for upstream from current hash.
 if [ -n "$prev_hash" ]; then
   echo "git log from upstream:"
   pretty_git_log="$(git log \
                     --no-merges \
                     --topo-order \
                     --pretty="%h %s" \
+                    --max-count=20 \
                     $prev_hash..$hash)"
   if [ -z "$pretty_git_log" ]; then
     echo "No log found. Checking for reverts."
     pretty_git_log="$(git log \
                       --no-merges \
                       --topo-order \
                       --pretty="%h %s" \
+                      --max-count=20 \
                       $hash..$prev_hash)"
   fi
   echo "$pretty_git_log"
+  # If it makes it to 20 then it's probably skipping even more.
+  if [ `echo "$pretty_git_log" | wc -l` -eq 20 ]; then
+    echo "<...>"
+  fi
 fi
 
+# Commit message footer.
+echo ""
+echo "TBR=tomfinegan@chromium.org"

[Tom Finegan, 2015/03/10 22:32:05]

lol

+echo "==============="
+
 # Git is useless now, remove the local git repo.
 rm -rf .git
 
 # Add and remove files.
 echo "$add" | xargs -I {} git add {}
 echo "$delete" | xargs -I {} git rm {}
 
 # Find empty directories and remove them.
 find . -type d -empty -exec git rm {} \;
 
 chmod 755 build/make/*.sh build/make/*.pl configure
 
 cd $BASE_DIR