This rewrites (the misnamed) setup_reflog_action() from shell to C. The
new version is called checkout_onto().

A new command is added to rebase--helper.c, “checkout-base”. The shell
version is then stripped.

As $GIT_REFLOG_ACTION is no longer set at the first call of
checkout_onto(), a call to comment_for_reflog() is added at the
beginning of this function.

If the commit OID provided to checkout_onto() is empty, nothing happens
and no errors are returned, otherwise it would break some
tests (t3404.92 and t3404.93).

Signed-off-by: Alban Gruin <alban.gr...@gmail.com>
---
 builtin/rebase--helper.c   |  6 +++++-
 git-rebase--interactive.sh | 15 +--------------
 sequencer.c                | 14 ++++++++++++++
 sequencer.h                |  2 ++
 4 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/builtin/rebase--helper.c b/builtin/rebase--helper.c
index 2dfd55c76..a00b1091d 100644
--- a/builtin/rebase--helper.c
+++ b/builtin/rebase--helper.c
@@ -17,7 +17,7 @@ int cmd_rebase__helper(int argc, const char **argv, const 
char *prefix)
        enum {
                CONTINUE = 1, ABORT, MAKE_SCRIPT, SHORTEN_OIDS, EXPAND_OIDS,
                CHECK_TODO_LIST, SKIP_UNNECESSARY_PICKS, REARRANGE_SQUASH,
-               ADD_EXEC, APPEND_TODO_HELP, EDIT_TODO, DETACH_ONTO
+               ADD_EXEC, APPEND_TODO_HELP, EDIT_TODO, DETACH_ONTO, 
CHECKOUT_ONTO
        } command = 0;
        struct option options[] = {
                OPT_BOOL(0, "ff", &opts.allow_ff, N_("allow fast-forward")),
@@ -53,6 +53,8 @@ int cmd_rebase__helper(int argc, const char **argv, const 
char *prefix)
                            EDIT_TODO),
                OPT_CMDMODE(0, "detach-onto", &command,
                            N_("checkout a commit"), DETACH_ONTO),
+               OPT_CMDMODE(0, "checkout-onto", &command,
+                           N_("checkout the base commit"), CHECKOUT_ONTO),
                OPT_END()
        };
 
@@ -98,5 +100,7 @@ int cmd_rebase__helper(int argc, const char **argv, const 
char *prefix)
                return !!edit_todo_list(flags);
        if (command == DETACH_ONTO && argc == 4)
                return !!detach_onto(&opts, argv[1], argv[2], argv[3], verbose);
+       if (command == CHECKOUT_ONTO && argc == 2)
+               return !!checkout_onto(&opts, argv[1], verbose);
        usage_with_options(builtin_rebase_helper_usage, options);
 }
diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index 2f5761d49..375c36fb5 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -112,19 +112,6 @@ initiate_action () {
        esac
 }
 
-setup_reflog_action () {
-       comment_for_reflog start
-
-       if test ! -z "$switch_to"
-       then
-               GIT_REFLOG_ACTION="$GIT_REFLOG_ACTION: checkout $switch_to"
-               output git checkout "$switch_to" -- ||
-                       die "$(eval_gettext "Could not checkout \$switch_to")"
-
-               comment_for_reflog start
-       fi
-}
-
 init_basic_state () {
        orig_head=$(git rev-parse --verify HEAD) || die "$(gettext "No HEAD?")"
        mkdir -p "$state_dir" || die "$(eval_gettext "Could not create 
temporary \$state_dir")"
@@ -206,7 +193,7 @@ git_rebase__interactive () {
                return 0
        fi
 
-       setup_reflog_action
+       git rebase--helper --checkout-onto "$switch_to" ${verbose:+--verbose}
        init_basic_state
 
        init_revisions_and_shortrevisions
diff --git a/sequencer.c b/sequencer.c
index ee6374921..620b41e96 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -3165,6 +3165,20 @@ int detach_onto(struct replay_opts *opts,
        return update_ref(NULL, "ORIG_HEAD", &oid, NULL, 0, 
UPDATE_REFS_MSG_ON_ERR);
 }
 
+int checkout_onto(struct replay_opts *opts, const char *commit,
+                 int verbose)
+{
+       const char *action;
+
+       if (commit && *commit) {
+               action = reflog_message(opts, "start", "checkout %s", commit);
+               if (run_git_checkout(opts, commit, verbose, action))
+                       return error(_("Could not checkout %s"), commit);
+       }
+
+       return 0;
+}
+
 static const char rescheduled_advice[] =
 N_("Could not execute the todo command\n"
 "\n"
diff --git a/sequencer.h b/sequencer.h
index 9f0ac5e75..afbb2edf1 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -103,6 +103,8 @@ void commit_post_rewrite(const struct commit *current_head,
 int detach_onto(struct replay_opts *opts,
                const char *onto_name, const char *onto,
                const char *orig_head, unsigned verbose);
+int checkout_onto(struct replay_opts *opts, const char *commit,
+                 int verbose);
 
 #define SUMMARY_INITIAL_COMMIT   (1 << 0)
 #define SUMMARY_SHOW_AUTHOR_DATE (1 << 1)
-- 
2.18.0

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