Remove the rebase.useBuiltin setting, which was added as an escape
hatch to disable the builtin version of rebase first released with Git
2.20.

See [1] for the initial implementation of rebase.useBuiltin, and [2]
and [3] for the documentation and corresponding
GIT_TEST_REBASE_USE_BUILTIN option.

As noted in [4] the test suite hasn't passed with
GIT_TEST_REBASE_USE_BUILTIN=false since c762aada1a ("rebase -x: sanity
check command", 2019-01-29). We could fix this as we did for another
such bug in 7e097e27d3 ("legacy-rebase: backport -C<n> and
--whitespace=<option> checks", 2018-11-20), or just decide that the
built-in version is stable enough, and remove the legacy version. This
patch implements that removal of the legacy version.

1. 55071ea248 ("rebase: start implementing it as a builtin",
   2018-08-07)
2. d8d0a546f0 ("rebase doc: document rebase.useBuiltin", 2018-11-14)
3. 62c23938fa ("tests: add a special setup where rebase.useBuiltin is
   off", 2018-11-14)
4. https://public-inbox.org/git/87ftsrke6r....@evledraar.gmail.com/
---

On Wed, Feb 13 2019, Ævar Arnfjörð Bjarmason wrote:
> On Tue, Jan 29 2019, Phillip Wood wrote:
>> [...]
>>  test_expect_success 'rebase -i with exec of inexistent command' '
>>      git checkout master &&
>>      test_when_finished "git rebase --abort" &&
>
> This patch breaks the test suite (with these two new tests) under
> GIT_TEST_REBASE_USE_BUILTIN=false. So a 2.21.0-rc0 regression.
>
> It would have been better to raise this before the rc period, but I just
> noticed this now, but we can now:
>
>  1. Skip the test under that mode
>  2. Fix the shell code to do the same thing
>  3. Just remove the shell code & GIT_TEST_REBASE_USE_BUILTIN=false mode
>
> Maybe we should just do #3. The reason for the escape hatch was in case
> we had bugs, and now we've had a full release cycle, but maybe that's
> too early...

Here is approach #3, intended for 2.21, but I'll defer to Junio on
whether we should take that approach.

 Documentation/config/rebase.txt |  17 +-
 Makefile                        |   1 -
 builtin/rebase.c                |  17 +-
 git-legacy-rebase.sh            | 770 --------------------------------
 t/README                        |   4 -
 t/t3400-rebase.sh               |   6 +
 6 files changed, 13 insertions(+), 802 deletions(-)
 delete mode 100755 git-legacy-rebase.sh

diff --git a/Documentation/config/rebase.txt b/Documentation/config/rebase.txt
index 331d250e04..c747452983 100644
--- a/Documentation/config/rebase.txt
+++ b/Documentation/config/rebase.txt
@@ -1,16 +1,9 @@
 rebase.useBuiltin::
-       Set to `false` to use the legacy shellscript implementation of
-       linkgit:git-rebase[1]. Is `true` by default, which means use
-       the built-in rewrite of it in C.
-+
-The C rewrite is first included with Git version 2.20. This option
-serves an an escape hatch to re-enable the legacy version in case any
-bugs are found in the rewrite. This option and the shellscript version
-of linkgit:git-rebase[1] will be removed in some future release.
-+
-If you find some reason to set this option to `false` other than
-one-off testing you should report the behavior difference as a bug in
-git.
+       Unused configuration variable. Used between Git version 2.20
+       and 2.21 as an escape hatch to enable the legacy shellscript
+       implementation of rebase. Now the built-in rewrite of it in C
+       is always used. Setting this will emit a warning, to alert any
+       remaining users that setting this now does nothing.
 
 rebase.stat::
        Whether to show a diffstat of what changed upstream since the last
diff --git a/Makefile b/Makefile
index 0e13a5b469..58dceccd8a 100644
--- a/Makefile
+++ b/Makefile
@@ -626,7 +626,6 @@ SCRIPT_SH += git-merge-one-file.sh
 SCRIPT_SH += git-merge-resolve.sh
 SCRIPT_SH += git-mergetool.sh
 SCRIPT_SH += git-quiltimport.sh
-SCRIPT_SH += git-legacy-rebase.sh
 SCRIPT_SH += git-remote-testgit.sh
 SCRIPT_SH += git-request-pull.sh
 SCRIPT_SH += git-stash.sh
diff --git a/builtin/rebase.c b/builtin/rebase.c
index 7c7bc13e91..37a036933d 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -1135,21 +1135,8 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
        };
        int i;
 
-       /*
-        * NEEDSWORK: Once the builtin rebase has been tested enough
-        * and git-legacy-rebase.sh is retired to contrib/, this preamble
-        * can be removed.
-        */
-
-       if (!use_builtin_rebase()) {
-               const char *path = mkpath("%s/git-legacy-rebase",
-                                         git_exec_path());
-
-               if (sane_execvp(path, (char **)argv) < 0)
-                       die_errno(_("could not exec %s"), path);
-               else
-                       BUG("sane_execvp() returned???");
-       }
+       if (!use_builtin_rebase())
+               warning(_("The rebase.useBuiltin support has been removed!"));
 
        if (argc == 2 && !strcmp(argv[1], "-h"))
                usage_with_options(builtin_rebase_usage,
diff --git a/git-legacy-rebase.sh b/git-legacy-rebase.sh
deleted file mode 100755
index 5c2c4e5276..0000000000
--- a/git-legacy-rebase.sh
+++ /dev/null
@@ -1,770 +0,0 @@
-#!/bin/sh
-#
-# Copyright (c) 2005 Junio C Hamano.
-#
-
-SUBDIRECTORY_OK=Yes
-OPTIONS_KEEPDASHDASH=
-OPTIONS_STUCKLONG=t
-OPTIONS_SPEC="\
-git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] [<upstream>] 
[<branch>]
-git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] --root [<branch>]
-git rebase --continue | --abort | --skip | --edit-todo
---
- Available options are
-v,verbose!         display a diffstat of what changed upstream
-q,quiet!           be quiet. implies --no-stat
-autostash          automatically stash/stash pop before and after
-fork-point         use 'merge-base --fork-point' to refine upstream
-onto=!             rebase onto given branch instead of upstream
-r,rebase-merges?   try to rebase merges instead of skipping them
-p,preserve-merges! try to recreate merges instead of ignoring them
-s,strategy=!       use the given merge strategy
-X,strategy-option=! pass the argument through to the merge strategy
-no-ff!             cherry-pick all commits, even if unchanged
-f,force-rebase!    cherry-pick all commits, even if unchanged
-m,merge!           use merging strategies to rebase
-i,interactive!     let the user edit the list of commits to rebase
-x,exec=!           add exec lines after each commit of the editable list
-k,keep-empty      preserve empty commits during rebase
-allow-empty-message allow rebasing commits with empty messages
-stat!              display a diffstat of what changed upstream
-n,no-stat!         do not show diffstat of what changed upstream
-verify             allow pre-rebase hook to run
-rerere-autoupdate  allow rerere to update index with resolved conflicts
-root!              rebase all reachable commits up to the root(s)
-autosquash         move commits that begin with squash!/fixup! under -i
-signoff            add a Signed-off-by: line to each commit
-committer-date-is-author-date! passed to 'git am'
-ignore-date!       passed to 'git am'
-whitespace=!       passed to 'git apply'
-ignore-whitespace! passed to 'git apply'
-C=!                passed to 'git apply'
-S,gpg-sign?        GPG-sign commits
- Actions:
-continue!          continue
-abort!             abort and check out the original branch
-skip!              skip current patch and continue
-edit-todo!         edit the todo list during an interactive rebase
-quit!              abort but keep HEAD where it is
-show-current-patch! show the patch file being applied or merged
-reschedule-failed-exec automatically reschedule failed exec commands
-"
-. git-sh-setup
-set_reflog_action rebase
-require_work_tree_exists
-cd_to_toplevel
-
-LF='
-'
-ok_to_skip_pre_rebase=
-
-squash_onto=
-unset onto
-unset restrict_revision
-cmd=
-strategy=
-strategy_opts=
-do_merge=
-merge_dir="$GIT_DIR"/rebase-merge
-apply_dir="$GIT_DIR"/rebase-apply
-verbose=
-diffstat=
-test "$(git config --bool rebase.stat)" = true && diffstat=t
-autostash="$(git config --bool rebase.autostash || echo false)"
-fork_point=auto
-git_am_opt=
-git_format_patch_opt=
-rebase_root=
-force_rebase=
-allow_rerere_autoupdate=
-# Non-empty if a rebase was in progress when 'git rebase' was invoked
-in_progress=
-# One of {am, merge, interactive}
-type=
-# One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
-state_dir=
-# One of {'', continue, skip, abort}, as parsed from command line
-action=
-rebase_merges=
-rebase_cousins=
-preserve_merges=
-autosquash=
-keep_empty=
-allow_empty_message=--allow-empty-message
-signoff=
-reschedule_failed_exec=
-test "$(git config --bool rebase.autosquash)" = "true" && autosquash=t
-case "$(git config --bool commit.gpgsign)" in
-true)  gpg_sign_opt=-S ;;
-*)     gpg_sign_opt= ;;
-esac
-test "$(git config --bool rebase.reschedulefailedexec)" = "true" &&
-reschedule_failed_exec=--reschedule-failed-exec
-. git-rebase--common
-
-read_basic_state () {
-       test -f "$state_dir/head-name" &&
-       test -f "$state_dir/onto" &&
-       head_name=$(cat "$state_dir"/head-name) &&
-       onto=$(cat "$state_dir"/onto) &&
-       # We always write to orig-head, but interactive rebase used to write to
-       # head. Fall back to reading from head to cover for the case that the
-       # user upgraded git with an ongoing interactive rebase.
-       if test -f "$state_dir"/orig-head
-       then
-               orig_head=$(cat "$state_dir"/orig-head)
-       else
-               orig_head=$(cat "$state_dir"/head)
-       fi &&
-       test -f "$state_dir"/quiet && GIT_QUIET=t
-       test -f "$state_dir"/verbose && verbose=t
-       test -f "$state_dir"/strategy && strategy="$(cat "$state_dir"/strategy)"
-       test -f "$state_dir"/strategy_opts &&
-               strategy_opts="$(cat "$state_dir"/strategy_opts)"
-       test -f "$state_dir"/allow_rerere_autoupdate &&
-               allow_rerere_autoupdate="$(cat 
"$state_dir"/allow_rerere_autoupdate)"
-       test -f "$state_dir"/gpg_sign_opt &&
-               gpg_sign_opt="$(cat "$state_dir"/gpg_sign_opt)"
-       test -f "$state_dir"/signoff && {
-               signoff="$(cat "$state_dir"/signoff)"
-               force_rebase=t
-       }
-       test -f "$state_dir"/reschedule-failed-exec &&
-               reschedule_failed_exec=t
-}
-
-finish_rebase () {
-       rm -f "$(git rev-parse --git-path REBASE_HEAD)"
-       apply_autostash &&
-       { git gc --auto || true; } &&
-       rm -rf "$state_dir"
-}
-
-run_interactive () {
-       GIT_CHERRY_PICK_HELP="$resolvemsg"
-       export GIT_CHERRY_PICK_HELP
-
-       test -n "$keep_empty" && keep_empty="--keep-empty"
-       test -n "$rebase_merges" && rebase_merges="--rebase-merges"
-       test -n "$rebase_cousins" && rebase_cousins="--rebase-cousins"
-       test -n "$autosquash" && autosquash="--autosquash"
-       test -n "$verbose" && verbose="--verbose"
-       test -n "$force_rebase" && force_rebase="--no-ff"
-       test -n "$restrict_revision" && \
-               restrict_revision="--restrict-revision=^$restrict_revision"
-       test -n "$upstream" && upstream="--upstream=$upstream"
-       test -n "$onto" && onto="--onto=$onto"
-       test -n "$squash_onto" && squash_onto="--squash-onto=$squash_onto"
-       test -n "$onto_name" && onto_name="--onto-name=$onto_name"
-       test -n "$head_name" && head_name="--head-name=$head_name"
-       test -n "$strategy" && strategy="--strategy=$strategy"
-       test -n "$strategy_opts" && 
strategy_opts="--strategy-opts=$strategy_opts"
-       test -n "$switch_to" && switch_to="--switch-to=$switch_to"
-       test -n "$cmd" && cmd="--cmd=$cmd"
-       test -n "$action" && action="--$action"
-
-       exec git rebase--interactive "$action" "$keep_empty" "$rebase_merges" 
"$rebase_cousins" \
-               "$upstream" "$onto" "$squash_onto" "$restrict_revision" \
-               "$allow_empty_message" "$autosquash" "$verbose" \
-               "$force_rebase" "$onto_name" "$head_name" "$strategy" \
-               "$strategy_opts" "$cmd" "$switch_to" \
-               "$allow_rerere_autoupdate" "$gpg_sign_opt" "$signoff" \
-               "$reschedule_failed_exec"
-}
-
-run_specific_rebase () {
-       if [ "$interactive_rebase" = implied ]; then
-               GIT_SEQUENCE_EDITOR=:
-               export GIT_SEQUENCE_EDITOR
-               autosquash=
-       fi
-
-       if test -n "$interactive_rebase" -a -z "$preserve_merges"
-       then
-               run_interactive
-       else
-               . git-rebase--$type
-
-               if test -z "$preserve_merges"
-               then
-                       git_rebase__$type
-               else
-                       git_rebase__preserve_merges
-               fi
-       fi
-
-       ret=$?
-       if test $ret -eq 0
-       then
-               finish_rebase
-       elif test $ret -eq 2 # special exit status for rebase -p
-       then
-               apply_autostash &&
-               rm -rf "$state_dir" &&
-               die "Nothing to do"
-       fi
-       exit $ret
-}
-
-run_pre_rebase_hook () {
-       if test -z "$ok_to_skip_pre_rebase" &&
-          test -x "$(git rev-parse --git-path hooks/pre-rebase)"
-       then
-               "$(git rev-parse --git-path hooks/pre-rebase)" ${1+"$@"} ||
-               die "$(gettext "The pre-rebase hook refused to rebase.")"
-       fi
-}
-
-test -f "$apply_dir"/applying &&
-       die "$(gettext "It looks like 'git am' is in progress. Cannot rebase.")"
-
-if test -d "$apply_dir"
-then
-       type=am
-       state_dir="$apply_dir"
-elif test -d "$merge_dir"
-then
-       type=interactive
-       if test -d "$merge_dir"/rewritten
-       then
-               type=preserve-merges
-               interactive_rebase=explicit
-               preserve_merges=t
-       elif test -f "$merge_dir"/interactive
-       then
-               interactive_rebase=explicit
-       fi
-       state_dir="$merge_dir"
-fi
-test -n "$type" && in_progress=t
-
-total_argc=$#
-while test $# != 0
-do
-       case "$1" in
-       --no-verify)
-               ok_to_skip_pre_rebase=yes
-               ;;
-       --verify)
-               ok_to_skip_pre_rebase=
-               ;;
-       --continue|--skip|--abort|--quit|--edit-todo|--show-current-patch)
-               test $total_argc -eq 2 || usage
-               action=${1##--}
-               ;;
-       --onto=*)
-               onto="${1#--onto=}"
-               ;;
-       --exec=*)
-               cmd="${cmd}exec ${1#--exec=}${LF}"
-               test -z "$interactive_rebase" && interactive_rebase=implied
-               ;;
-       --interactive)
-               interactive_rebase=explicit
-               ;;
-       --keep-empty)
-               keep_empty=yes
-               ;;
-       --allow-empty-message)
-               allow_empty_message=--allow-empty-message
-               ;;
-       --no-keep-empty)
-               keep_empty=
-               ;;
-       --rebase-merges)
-               rebase_merges=t
-               test -z "$interactive_rebase" && interactive_rebase=implied
-               ;;
-       --rebase-merges=*)
-               rebase_merges=t
-               case "${1#*=}" in
-               rebase-cousins) rebase_cousins=t;;
-               no-rebase-cousins) rebase_cousins=;;
-               *) die "Unknown mode: $1";;
-               esac
-               test -z "$interactive_rebase" && interactive_rebase=implied
-               ;;
-       --preserve-merges)
-               preserve_merges=t
-               test -z "$interactive_rebase" && interactive_rebase=implied
-               ;;
-       --autosquash)
-               autosquash=t
-               ;;
-       --no-autosquash)
-               autosquash=
-               ;;
-       --fork-point)
-               fork_point=t
-               ;;
-       --no-fork-point)
-               fork_point=
-               ;;
-       --merge)
-               do_merge=t
-               ;;
-       --strategy-option=*)
-               strategy_opts="$strategy_opts $(git rev-parse --sq-quote 
"--${1#--strategy-option=}" | sed -e s/^.//)"
-               do_merge=t
-               test -z "$strategy" && strategy=recursive
-               ;;
-       --strategy=*)
-               strategy="${1#--strategy=}"
-               do_merge=t
-               ;;
-       --no-stat)
-               diffstat=
-               ;;
-       --stat)
-               diffstat=t
-               ;;
-       --autostash)
-               autostash=true
-               ;;
-       --no-autostash)
-               autostash=false
-               ;;
-       --verbose)
-               verbose=t
-               diffstat=t
-               GIT_QUIET=
-               ;;
-       --quiet)
-               GIT_QUIET=t
-               git_am_opt="$git_am_opt -q"
-               verbose=
-               diffstat=
-               ;;
-       --whitespace=*)
-               git_am_opt="$git_am_opt --whitespace=${1#--whitespace=}"
-               case "${1#--whitespace=}" in
-               fix|strip)
-                       force_rebase=t
-                       ;;
-               warn|nowarn|error|error-all)
-                       ;; # okay, known whitespace option
-               *)
-                       die "fatal: Invalid whitespace option: '${1#*=}'"
-                       ;;
-               esac
-               ;;
-       --ignore-whitespace)
-               git_am_opt="$git_am_opt $1"
-               ;;
-       --signoff)
-               signoff=--signoff
-               ;;
-       --no-signoff)
-               signoff=
-               ;;
-       --committer-date-is-author-date|--ignore-date)
-               git_am_opt="$git_am_opt $1"
-               force_rebase=t
-               ;;
-       -C*[!0-9]*)
-               die "fatal: switch \`C' expects a numerical value"
-               ;;
-       -C*)
-               git_am_opt="$git_am_opt $1"
-               ;;
-       --root)
-               rebase_root=t
-               ;;
-       --force-rebase|--no-ff)
-               force_rebase=t
-               ;;
-       --rerere-autoupdate|--no-rerere-autoupdate)
-               allow_rerere_autoupdate="$1"
-               ;;
-       --gpg-sign)
-               gpg_sign_opt=-S
-               ;;
-       --gpg-sign=*)
-               gpg_sign_opt="-S${1#--gpg-sign=}"
-               ;;
-       --reschedule-failed-exec)
-               reschedule_failed_exec=--reschedule-failed-exec
-               ;;
-       --no-reschedule-failed-exec)
-               reschedule_failed_exec=
-               ;;
-       --)
-               shift
-               break
-               ;;
-       *)
-               usage
-               ;;
-       esac
-       shift
-done
-test $# -gt 2 && usage
-
-if test -n "$action"
-then
-       test -z "$in_progress" && die "$(gettext "No rebase in progress?")"
-       # Only interactive rebase uses detailed reflog messages
-       if test -n "$interactive_rebase" && test "$GIT_REFLOG_ACTION" = rebase
-       then
-               GIT_REFLOG_ACTION="rebase -i ($action)"
-               export GIT_REFLOG_ACTION
-       fi
-fi
-
-if test "$action" = "edit-todo" && test -z "$interactive_rebase"
-then
-       die "$(gettext "The --edit-todo action can only be used during 
interactive rebase.")"
-fi
-
-case "$action" in
-continue)
-       # Sanity check
-       git rev-parse --verify HEAD >/dev/null ||
-               die "$(gettext "Cannot read HEAD")"
-       git update-index --ignore-submodules --refresh &&
-       git diff-files --quiet --ignore-submodules || {
-               echo "$(gettext "You must edit all merge conflicts and then
-mark them as resolved using git add")"
-               exit 1
-       }
-       read_basic_state
-       run_specific_rebase
-       ;;
-skip)
-       output git reset --hard HEAD || exit $?
-       read_basic_state
-       run_specific_rebase
-       ;;
-abort)
-       git rerere clear
-       read_basic_state
-       case "$head_name" in
-       refs/*)
-               git symbolic-ref -m "rebase: aborting" HEAD $head_name ||
-               die "$(eval_gettext "Could not move back to \$head_name")"
-               ;;
-       esac
-       output git reset --hard $orig_head
-       finish_rebase
-       exit
-       ;;
-quit)
-       exec rm -rf "$state_dir"
-       ;;
-edit-todo)
-       run_specific_rebase
-       ;;
-show-current-patch)
-       run_specific_rebase
-       die "BUG: run_specific_rebase is not supposed to return here"
-       ;;
-esac
-
-# Make sure no rebase is in progress
-if test -n "$in_progress"
-then
-       state_dir_base=${state_dir##*/}
-       cmd_live_rebase="git rebase (--continue | --abort | --skip)"
-       cmd_clear_stale_rebase="rm -fr \"$state_dir\""
-       die "
-$(eval_gettext 'It seems that there is already a $state_dir_base directory, and
-I wonder if you are in the middle of another rebase.  If that is the
-case, please try
-       $cmd_live_rebase
-If that is not the case, please
-       $cmd_clear_stale_rebase
-and run me again.  I am stopping in case you still have something
-valuable there.')"
-fi
-
-if test -n "$rebase_root" && test -z "$onto"
-then
-       test -z "$interactive_rebase" && interactive_rebase=implied
-fi
-
-if test -n "$keep_empty"
-then
-       test -z "$interactive_rebase" && interactive_rebase=implied
-fi
-
-actually_interactive=
-if test -n "$interactive_rebase"
-then
-       if test -z "$preserve_merges"
-       then
-               type=interactive
-       else
-               type=preserve-merges
-       fi
-       actually_interactive=t
-       state_dir="$merge_dir"
-elif test -n "$do_merge"
-then
-       interactive_rebase=implied
-       type=interactive
-       state_dir="$merge_dir"
-else
-       type=am
-       state_dir="$apply_dir"
-fi
-
-if test -t 2 && test -z "$GIT_QUIET"
-then
-       git_format_patch_opt="$git_format_patch_opt --progress"
-fi
-
-incompatible_opts=$(echo " $git_am_opt " | \
-                   sed -e 's/ -q / /g' -e 's/^ \(.*\) $/\1/')
-if test -n "$incompatible_opts"
-then
-       if test -n "$actually_interactive" || test "$do_merge"
-       then
-               die "$(gettext "fatal: cannot combine am options with either 
interactive or merge options")"
-       fi
-fi
-
-if test -n "$signoff"
-then
-       test -n "$preserve_merges" &&
-               die "$(gettext "fatal: cannot combine '--signoff' with 
'--preserve-merges'")"
-       git_am_opt="$git_am_opt $signoff"
-       force_rebase=t
-fi
-
-if test -n "$preserve_merges"
-then
-       # Note: incompatibility with --signoff handled in signoff block above
-       # Note: incompatibility with --interactive is just a strong warning;
-       #       git-rebase.txt caveats with "unless you know what you are doing"
-       test -n "$rebase_merges" &&
-               die "$(gettext "fatal: cannot combine '--preserve-merges' with 
'--rebase-merges'")"
-
-       test -n "$reschedule_failed_exec" &&
-               die "$(gettext "error: cannot combine '--preserve-merges' with 
'--reschedule-failed-exec'")"
-fi
-
-if test -n "$rebase_merges"
-then
-       test -n "$strategy_opts" &&
-               die "$(gettext "fatal: cannot combine '--rebase-merges' with 
'--strategy-option'")"
-       test -n "$strategy" &&
-               die "$(gettext "fatal: cannot combine '--rebase-merges' with 
'--strategy'")"
-fi
-
-if test -z "$rebase_root"
-then
-       case "$#" in
-       0)
-               if ! upstream_name=$(git rev-parse --symbolic-full-name \
-                       --verify -q @{upstream} 2>/dev/null)
-               then
-                       . git-parse-remote
-                       error_on_missing_default_upstream "rebase" "rebase" \
-                               "against" "git rebase $(gettext '<branch>')"
-               fi
-
-               test "$fork_point" = auto && fork_point=t
-               ;;
-       *)      upstream_name="$1"
-               if test "$upstream_name" = "-"
-               then
-                       upstream_name="@{-1}"
-               fi
-               shift
-               ;;
-       esac
-       upstream=$(peel_committish "${upstream_name}") ||
-       die "$(eval_gettext "invalid upstream '\$upstream_name'")"
-       upstream_arg="$upstream_name"
-else
-       if test -z "$onto"
-       then
-               empty_tree=$(git hash-object -t tree /dev/null)
-               onto=$(git commit-tree $empty_tree </dev/null)
-               squash_onto="$onto"
-       fi
-       unset upstream_name
-       unset upstream
-       test $# -gt 1 && usage
-       upstream_arg=--root
-fi
-
-# Make sure the branch to rebase onto is valid.
-onto_name=${onto-"$upstream_name"}
-case "$onto_name" in
-*...*)
-       if      left=${onto_name%...*} right=${onto_name#*...} &&
-               onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
-       then
-               case "$onto" in
-               ?*"$LF"?*)
-                       die "$(eval_gettext "\$onto_name: there are more than 
one merge bases")"
-                       ;;
-               '')
-                       die "$(eval_gettext "\$onto_name: there is no merge 
base")"
-                       ;;
-               esac
-       else
-               die "$(eval_gettext "\$onto_name: there is no merge base")"
-       fi
-       ;;
-*)
-       onto=$(peel_committish "$onto_name") ||
-       die "$(eval_gettext "Does not point to a valid commit: \$onto_name")"
-       ;;
-esac
-
-# If the branch to rebase is given, that is the branch we will rebase
-# $branch_name -- branch/commit being rebased, or HEAD (already detached)
-# $orig_head -- commit object name of tip of the branch before rebasing
-# $head_name -- refs/heads/<that-branch> or "detached HEAD"
-switch_to=
-case "$#" in
-1)
-       # Is it "rebase other $branchname" or "rebase other $commit"?
-       branch_name="$1"
-       switch_to="$1"
-
-       # Is it a local branch?
-       if git show-ref --verify --quiet -- "refs/heads/$branch_name" &&
-          orig_head=$(git rev-parse -q --verify "refs/heads/$branch_name")
-       then
-               head_name="refs/heads/$branch_name"
-       # If not is it a valid ref (branch or commit)?
-       elif orig_head=$(git rev-parse -q --verify "$branch_name")
-       then
-               head_name="detached HEAD"
-
-       else
-               die "$(eval_gettext "fatal: no such branch/commit 
'\$branch_name'")"
-       fi
-       ;;
-0)
-       # Do not need to switch branches, we are already on it.
-       if branch_name=$(git symbolic-ref -q HEAD)
-       then
-               head_name=$branch_name
-               branch_name=$(expr "z$branch_name" : 'zrefs/heads/\(.*\)')
-       else
-               head_name="detached HEAD"
-               branch_name=HEAD
-       fi
-       orig_head=$(git rev-parse --verify HEAD) || exit
-       ;;
-*)
-       die "BUG: unexpected number of arguments left to parse"
-       ;;
-esac
-
-if test "$fork_point" = t
-then
-       new_upstream=$(git merge-base --fork-point "$upstream_name" \
-                       "${switch_to:-HEAD}")
-       if test -n "$new_upstream"
-       then
-               restrict_revision=$new_upstream
-       fi
-fi
-
-if test "$autostash" = true && ! (require_clean_work_tree) 2>/dev/null
-then
-       stash_sha1=$(git stash create "autostash") ||
-       die "$(gettext 'Cannot autostash')"
-
-       mkdir -p "$state_dir" &&
-       echo $stash_sha1 >"$state_dir/autostash" &&
-       stash_abbrev=$(git rev-parse --short $stash_sha1) &&
-       echo "$(eval_gettext 'Created autostash: $stash_abbrev')" &&
-       git reset --hard
-fi
-
-require_clean_work_tree "rebase" "$(gettext "Please commit or stash them.")"
-
-# Now we are rebasing commits $upstream..$orig_head (or with --root,
-# everything leading up to $orig_head) on top of $onto
-
-# Check if we are already based on $onto with linear history,
-# but this should be done only when upstream and onto are the same
-# and if this is not an interactive rebase.
-mb=$(git merge-base "$onto" "$orig_head")
-if test -z "$actually_interactive" && test "$upstream" = "$onto" &&
-       test "$mb" = "$onto" && test -z "$restrict_revision" &&
-       # linear history?
-       ! (git rev-list --parents "$onto".."$orig_head" | sane_grep " .* ") > 
/dev/null
-then
-       if test -z "$force_rebase"
-       then
-               # Lazily switch to the target branch if needed...
-               test -z "$switch_to" ||
-               GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to" \
-                       git checkout -q "$switch_to" --
-               if test "$branch_name" = "HEAD" &&
-                        ! git symbolic-ref -q HEAD
-               then
-                       say "$(eval_gettext "HEAD is up to date.")"
-               else
-                       say "$(eval_gettext "Current branch \$branch_name is up 
to date.")"
-               fi
-               finish_rebase
-               exit 0
-       else
-               if test "$branch_name" = "HEAD" &&
-                        ! git symbolic-ref -q HEAD
-               then
-                       say "$(eval_gettext "HEAD is up to date, rebase 
forced.")"
-               else
-                       say "$(eval_gettext "Current branch \$branch_name is up 
to date, rebase forced.")"
-               fi
-       fi
-fi
-
-# If a hook exists, give it a chance to interrupt
-run_pre_rebase_hook "$upstream_arg" "$@"
-
-if test -n "$diffstat"
-then
-       if test -n "$verbose"
-       then
-               if test -z "$mb"
-               then
-                       echo "$(eval_gettext "Changes to \$onto:")"
-               else
-                       echo "$(eval_gettext "Changes from \$mb to \$onto:")"
-               fi
-       fi
-       mb_tree="${mb:-$(git hash-object -t tree /dev/null)}"
-       # We want color (if set), but no pager
-       GIT_PAGER='' git diff --stat --summary "$mb_tree" "$onto"
-fi
-
-if test -z "$actually_interactive" && test "$mb" = "$orig_head"
-then
-       say "$(eval_gettext "Fast-forwarded \$branch_name to \$onto_name.")"
-       GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
-               git checkout -q "$onto^0" || die "could not detach HEAD"
-       # If the $onto is a proper descendant of the tip of the branch, then
-       # we just fast-forwarded.
-       git update-ref ORIG_HEAD $orig_head
-       move_to_original_branch
-       finish_rebase
-       exit 0
-fi
-
-test -n "$interactive_rebase" && run_specific_rebase
-
-# Detach HEAD and reset the tree
-say "$(gettext "First, rewinding head to replay your work on top of it...")"
-
-GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $onto_name" \
-       git checkout -q "$onto^0" || die "could not detach HEAD"
-git update-ref ORIG_HEAD $orig_head
-
-if test -n "$rebase_root"
-then
-       revisions="$onto..$orig_head"
-else
-       revisions="${restrict_revision-$upstream}..$orig_head"
-fi
-
-run_specific_rebase
diff --git a/t/README b/t/README
index 1326fd7505..decceb8576 100644
--- a/t/README
+++ b/t/README
@@ -374,10 +374,6 @@ the --no-sparse command-line argument.
 GIT_TEST_PRELOAD_INDEX=<boolean> exercises the preload-index code path
 by overriding the minimum number of cache entries required per thread.
 
-GIT_TEST_REBASE_USE_BUILTIN=<boolean>, when false, disables the
-builtin version of git-rebase. See 'rebase.useBuiltin' in
-git-config(1).
-
 GIT_TEST_INDEX_THREADS=<n> enables exercising the multi-threaded loading
 of the index for the whole test suite by bypassing the default number of
 cache entries and thread minimums. Setting this to 1 will make the
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index 3e73f7584c..0a88eed1db 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -311,4 +311,10 @@ test_expect_success 'rebase--merge.sh and 
--show-current-patch' '
        )
 '
 
+test_expect_success 'rebase -c rebase.useBuiltin=false warning' '
+       test_must_fail env GIT_TEST_REBASE_USE_BUILTIN= \
+               git -c rebase.useBuiltin=false rebase 2>err &&
+       test_i18ngrep "rebase.useBuiltin support has been removed" err
+'
+
 test_done
-- 
2.20.1.611.gfbb209baf1

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