When we switch from one branch to another, it makes sense to show a
summary of local changes since there could be conflicts, or some files
left modified.... When switch is used solely for creating a new
branch (and "switch" to the same commit) or detaching, we don't really
need to show anything.
"git checkout" does it anyway for historical reasons. But we can start
with a clean slate with switch and don't have to.
This essentially reverts fa655d8411 (checkout: optimize "git checkout
-b <new_branch>" - 2018-08-16) and make it default for switch,
but also for -B and --detach. Users of big repos are encouraged to
move to switch.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
Documentation/config/checkout.txt | 8 --
builtin/checkout.c | 134 ++----------------------------
t/t1090-sparse-checkout-scope.sh | 14 ----
3 files changed, 8 insertions(+), 148 deletions(-)
diff --git a/Documentation/config/checkout.txt b/Documentation/config/checkout.txt
index d6872ffa83..6b646813ab 100644
--- a/Documentation/config/checkout.txt
+++ b/Documentation/config/checkout.txt
@@ -16,11 +16,3 @@ will checkout the '<something>' branch on another remote,
and by linkgit:git-worktree[1] when 'git worktree add' refers to a
remote branch. This setting might be used for other checkout-like
commands or functionality in the future.
-
-checkout.optimizeNewBranch::
- Optimizes the performance of "git checkout -b <new_branch>" when
- using sparse-checkout. When set to true, git will not update the
- repo based on the current sparse-checkout settings. This means it
- will not update the skip-worktree bit in the index nor add/remove
- files in the working directory to reflect the current sparse checkout
- settings nor will it show the local changes.
diff --git a/builtin/checkout.c b/builtin/checkout.c
index ff9b96993d..f7967cdb7c 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -26,8 +26,6 @@
#include "unpack-trees.h"
#include "xdiff-interface.h"
-static int checkout_optimize_new_branch;
-
static const char * const checkout_usage[] = {
N_("git checkout [<options>] <branch>"),
N_("git checkout [<options>] [<branch>] -- <file>..."),
@@ -57,11 +55,7 @@ struct checkout_opts {
int discard_changes;
int accept_pathspec;
int switch_branch_doing_nothing_is_ok;
-
- /*
- * If new checkout options are added, skip_merge_working_tree
- * should be updated accordingly.
- */
+ int only_merge_on_switching_branches;
const char *new_branch;
const char *new_branch_force;
@@ -565,112 +559,6 @@ static void setup_branch_path(struct branch_info *branch)
branch->path = strbuf_detach(&buf, NULL);
}
-/*
- * Skip merging the trees, updating the index and working directory if and
- * only if we are creating a new branch via "git checkout -b <new_branch>."
- */
-static int skip_merge_working_tree(const struct checkout_opts *opts,
- const struct branch_info *old_branch_info,
- const struct branch_info *new_branch_info)
-{
- /*
- * Do the merge if sparse checkout is on and the user has not opted in
- * to the optimized behavior
- */
- if (core_apply_sparse_checkout && !checkout_optimize_new_branch)
- return 0;
-
- /*
- * We must do the merge if we are actually moving to a new commit.
- */
- if (!old_branch_info->commit || !new_branch_info->commit ||
- !oideq(&old_branch_info->commit->object.oid,
- &new_branch_info->commit->object.oid))
- return 0;
-
- /*
- * opts->patch_mode cannot be used with switching branches so is
- * not tested here
- */
-
- /*
- * opts->quiet only impacts output so doesn't require a merge
- */
-
- /*
- * Honor the explicit request for a three-way merge or to throw away
- * local changes
- */
- if (opts->merge || opts->force)
- return 0;
-
- /*
- * --detach is documented as "updating the index and the files in the
- * working tree" but this optimization skips those steps so fall through
- * to the regular code path.
- */
- if (opts->force_detach)
- return 0;
-
- /*
- * opts->writeout_stage cannot be used with switching branches so is
- * not tested here
- */
-
- /*
- * Honor the explicit ignore requests
- */
- if (!opts->overwrite_ignore || opts->ignore_skipworktree ||
- opts->ignore_other_worktrees)
- return 0;
-
- /*
- * opts->show_progress only impacts output so doesn't require a merge
- */
-
- /*
- * opts->overlay_mode cannot be used with switching branches so is
- * not tested here
- */
-
- /*
- * If we aren't creating a new branch any changes or updates will
- * happen in the existing branch. Since that could only be updating
- * the index and working directory, we don't want to skip those steps
- * or we've defeated any purpose in running the command.
- */
- if (!opts->new_branch)
- return 0;
-
- /*
- * new_branch_force is defined to "create/reset and checkout a branch"
- * so needs to go through the merge to do the reset
- */
- if (opts->new_branch_force)
- return 0;
-
- /*
- * A new orphaned branch requrires the index and the working tree to be
- * adjusted to <start_point>
- */
- if (opts->new_orphan_branch)
- return 0;
-
- /*
- * Remaining variables are not checkout options but used to track state
- */
-
- /*
- * Do the merge if this is the initial checkout. We cannot use
- * is_cache_unborn() here because the index hasn't been loaded yet
- * so cache_nr and timestamp.sec are always zero.
- */
- if (!file_exists(get_index_file()))
- return 0;
-
- return 1;
-}
-
static int merge_working_tree(const struct checkout_opts *opts,
struct branch_info *old_branch_info,
struct branch_info *new_branch_info,
@@ -1028,6 +916,7 @@ static int switch_branches(const struct checkout_opts *opts,
void *path_to_free;
struct object_id rev;
int flag, writeout_error = 0;
+ int do_merge = 1;
trace2_cmd_mode("branch");
@@ -1047,16 +936,12 @@ static int switch_branches(const struct checkout_opts *opts,
if (!new_branch_info->commit)
die(_("You are on a branch yet to be born"));
parse_commit_or_die(new_branch_info->commit);
+
+ if (opts->only_merge_on_switching_branches)
+ do_merge = 0;
}
- /* optimize the "checkout -b <new_branch> path */
- if (skip_merge_working_tree(opts, &old_branch_info, new_branch_info)) {
- if (!checkout_optimize_new_branch && !opts->quiet) {
- if (read_cache_preload(NULL) < 0)
- return error(_("index file corrupt"));
- show_local_changes(&new_branch_info->commit->object, &opts->diff_options);
- }
- } else {
+ if (do_merge) {
ret = merge_working_tree(opts, &old_branch_info, new_branch_info, &writeout_error);
if (ret) {
free(path_to_free);
@@ -1076,11 +961,6 @@ static int switch_branches(const struct checkout_opts *opts,
static int git_checkout_config(const char *var, const char *value, void *cb)
{
- if (!strcmp(var, "checkout.optimizenewbranch")) {
- checkout_optimize_new_branch = git_config_bool(var, value);
- return 0;
- }
-
if (!strcmp(var, "diff.ignoresubmodules")) {
struct checkout_opts *opts = cb;
handle_ignore_submodules_arg(&opts->diff_options, value);
@@ -1631,6 +1511,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
memset(&opts, 0, sizeof(opts));
opts.dwim_new_local_branch = 1;
opts.switch_branch_doing_nothing_is_ok = 1;
+ opts.only_merge_on_switching_branches = 0;
opts.accept_pathspec = 1;
opts.implicit_detach = 1;
@@ -1666,6 +1547,7 @@ int cmd_switch(int argc, const char **argv, const char *prefix)
opts.dwim_new_local_branch = 1;
opts.accept_pathspec = 0;
opts.switch_branch_doing_nothing_is_ok = 0;
+ opts.only_merge_on_switching_branches = 1;
opts.implicit_detach = 0;
options = parse_options_dup(switch_options);
diff --git a/t/t1090-sparse-checkout-scope.sh b/t/t1090-sparse-checkout-scope.sh
index 090b7fc3d3..40cc004326 100755
--- a/t/t1090-sparse-checkout-scope.sh
+++ b/t/t1090-sparse-checkout-scope.sh
@@ -31,20 +31,6 @@ test_expect_success 'perform sparse checkout of master' '
test_path_is_file c
'
-test_expect_success 'checkout -b checkout.optimizeNewBranch interaction' '
- cp .git/info/sparse-checkout .git/info/sparse-checkout.bak &&
- test_when_finished "
- mv -f .git/info/sparse-checkout.bak .git/info/sparse-checkout
- git checkout master
- " &&
- echo "/b" >>.git/info/sparse-checkout &&
- test "$(git ls-files -t b)" = "S b" &&
- git -c checkout.optimizeNewBranch=true checkout -b fast &&
- test "$(git ls-files -t b)" = "S b" &&
- git checkout -b slow &&
- test "$(git ls-files -t b)" = "H b"
-'
-
test_expect_success 'merge feature branch into sparse checkout of master' '
git merge feature &&
test_path_is_file a &&
--
2.21.0.479.g47ac719cd3
