[PATCH 31/31] rebase -i: remove unnecessary state rebase-root

[Martin von Zweigbergk <martin.von.zweigbergk@gmail.com>]

Before calling 'git cherry-pick', interactive rebase currently checks
if we are rebasing from root (if --root was passed). If we are, the
'--ff' flag to 'git cherry-pick' is omitted. However, according to the
documentation for 'git cherry-pick --ff', "If the current HEAD is the
same as the parent of the cherry-picked commit, then a fast forward to
this commit will be performed.". This should never be the case when
rebasing from root, so it should not matter whether --ff is passed, so
simplify the code by removing the condition.

Signed-off-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com>
---

While factoring out the state writing code a few patches back, I went
through each of the pieces of state that was written. I was a bit
hesitant to include this patch since I'm not quite sure why the code
was introduced, but I thought I would include it anyway to hear what
you have to say.

There used to be bug when using --ff when rebasing a root commit. This
was fixed in 6355e50 (builtin/revert.c: don't dereference a NULL
pointer, 2010-09-27). Could this have been the reason for the check?
Thomas, do you remember?

 git-rebase--interactive.sh |   15 ---------------
 1 files changed, 0 insertions(+), 15 deletions(-)

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index d20a9b2..a9f44d8 100755
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -168,11 +168,6 @@ pick_one () {
 	output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
 	test -d "$REWRITTEN" &&
 		pick_one_preserving_merges "$@" && return
-	if test -n "$rebase_root"
-	then
-		output git cherry-pick "$@"
-		return
-	fi
 	output git cherry-pick $ff "$@"
 }
 
@@ -582,10 +577,6 @@ skip_unnecessary_picks () {
 	die "Could not skip unnecessary pick commands"
 }
 
-get_saved_options () {
-	test -f "$state_dir"/rebase-root && rebase_root=t
-}
-
 # Rearrange the todo list that has both "pick sha1 msg" and
 # "pick sha1 fixup!/squash! msg" appears in it so that the latter
 # comes immediately after the former, and change "pick" to
@@ -701,12 +692,6 @@ mkdir "$state_dir" || die "Could not create temporary $state_dir"
 
 : > "$state_dir"/interactive || die "Could not mark as interactive"
 write_basic_state
-case "$rebase_root" in
-'')
-	rm -f "$state_dir"/rebase-root ;;
-*)
-	: >"$state_dir"/rebase-root ;;
-esac
 if test t = "$preserve_merges"
 then
 	if test -z "$rebase_root"
-- 
1.7.3.2.864.gbbb96