+ sed -n "s/^>//p" | while read shortsha1 rest
+ do
+ if test t != "$PRESERVE_MERGES"
+ then
+ echo "pick $shortsha1 $rest" >> "$TODO"
+ else
+ sha1=$(git rev-parse $shortsha1)
+ preserve=t
+ for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)
+ do
+ if test -f "$REWRITTEN"/$p -a \( $p != $UPSTREAM -o $sha1 = $first_after_upstream \)
+ then
+ preserve=f
+ fi
+ done
+ if test f = "$preserve"
+ then
+ touch "$REWRITTEN"/$sha1
+ echo "pick $shortsha1 $rest" >> "$TODO"
+ fi
+ fi
+ done
+
+ # Watch for commits that been dropped by --cherry-pick
+ if test t = "$PRESERVE_MERGES"
+ then
+ mkdir "$DROPPED"
+ # Save all non-cherry-picked changes
+ git rev-list $UPSTREAM...$HEAD --left-right --cherry-pick | \
+ sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
+ # Now all commits and note which ones are missing in
+ # not-cherry-picks and hence being dropped
+ git rev-list $UPSTREAM..$HEAD |
+ while read rev
+ do
+ if test -f "$REWRITTEN"/$rev -a "$(grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
+ then
+ # Use -f2 because if rev-list is telling us this commit is
+ # not worthwhile, we don't want to track its multiple heads,
+ # just the history of its first-parent for others that will
+ # be rebasing on top of it
+ git rev-list --parents -1 $rev | cut -d' ' -f2 > "$DROPPED"/$rev
+ short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
+ grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
+ rm "$REWRITTEN"/$rev
+ fi
+ done
+ fi
+ test -s "$TODO" || echo noop >> "$TODO"