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checkout.c
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#define USE_THE_REPOSITORY_VARIABLE
#define DISABLE_SIGN_COMPARE_WARNINGS
#include "builtin.h"
#include "advice.h"
#include "branch.h"
#include "cache-tree.h"
#include "checkout.h"
#include "commit.h"
#include "config.h"
#include "diff.h"
#include "dir.h"
#include "environment.h"
#include "gettext.h"
#include "hex.h"
#include "hook.h"
#include "merge-ll.h"
#include "lockfile.h"
#include "mem-pool.h"
#include "merge-ort-wrappers.h"
#include "object-file.h"
#include "object-name.h"
#include "object-store.h"
#include "parse-options.h"
#include "path.h"
#include "preload-index.h"
#include "read-cache.h"
#include "refs.h"
#include "remote.h"
#include "repo-settings.h"
#include "resolve-undo.h"
#include "revision.h"
#include "setup.h"
#include "submodule.h"
#include "symlinks.h"
#include "trace2.h"
#include "tree.h"
#include "tree-walk.h"
#include "unpack-trees.h"
#include "wt-status.h"
#include "xdiff-interface.h"
#include "entry.h"
#include "parallel-checkout.h"
#include "add-interactive.h"
static const char * const checkout_usage[] = {
N_("git checkout [<options>] <branch>"),
N_("git checkout [<options>] [<branch>] -- <file>..."),
NULL,
};
static const char * const switch_branch_usage[] = {
N_("git switch [<options>] [<branch>]"),
NULL,
};
static const char * const restore_usage[] = {
N_("git restore [<options>] [--source=<branch>] <file>..."),
NULL,
};
struct checkout_opts {
int patch_mode;
int quiet;
int merge;
int force;
int force_detach;
int implicit_detach;
int writeout_stage;
int overwrite_ignore;
int ignore_skipworktree;
int ignore_other_worktrees;
int show_progress;
int count_checkout_paths;
int overlay_mode;
int dwim_new_local_branch;
int discard_changes;
int accept_ref;
int accept_pathspec;
int switch_branch_doing_nothing_is_ok;
int only_merge_on_switching_branches;
int can_switch_when_in_progress;
int orphan_from_empty_tree;
int empty_pathspec_ok;
int checkout_index;
int checkout_worktree;
const char *ignore_unmerged_opt;
int ignore_unmerged;
int pathspec_file_nul;
char *pathspec_from_file;
const char *new_branch;
const char *new_branch_force;
const char *new_orphan_branch;
int new_branch_log;
enum branch_track track;
struct diff_options diff_options;
int conflict_style;
int branch_exists;
const char *prefix;
struct pathspec pathspec;
const char *from_treeish;
struct tree *source_tree;
};
#define CHECKOUT_OPTS_INIT { .conflict_style = -1, .merge = -1 }
struct branch_info {
char *name; /* The short name used */
char *path; /* The full name of a real branch */
struct commit *commit; /* The named commit */
char *refname; /* The full name of the ref being checked out. */
struct object_id oid; /* The object ID of the commit being checked out. */
/*
* if not null the branch is detached because it's already
* checked out in this checkout
*/
char *checkout;
};
static void branch_info_release(struct branch_info *info)
{
free(info->name);
free(info->path);
free(info->refname);
free(info->checkout);
}
static int post_checkout_hook(struct commit *old_commit, struct commit *new_commit,
int changed)
{
return run_hooks_l(the_repository, "post-checkout",
oid_to_hex(old_commit ? &old_commit->object.oid : null_oid(the_hash_algo)),
oid_to_hex(new_commit ? &new_commit->object.oid : null_oid(the_hash_algo)),
changed ? "1" : "0", NULL);
/* "new_commit" can be NULL when checking out from the index before
a commit exists. */
}
static int update_some(const struct object_id *oid, struct strbuf *base,
const char *pathname, unsigned mode, void *context UNUSED)
{
int len;
struct cache_entry *ce;
int pos;
if (S_ISDIR(mode))
return READ_TREE_RECURSIVE;
len = base->len + strlen(pathname);
ce = make_empty_cache_entry(the_repository->index, len);
oidcpy(&ce->oid, oid);
memcpy(ce->name, base->buf, base->len);
memcpy(ce->name + base->len, pathname, len - base->len);
ce->ce_flags = create_ce_flags(0) | CE_UPDATE;
ce->ce_namelen = len;
ce->ce_mode = create_ce_mode(mode);
/*
* If the entry is the same as the current index, we can leave the old
* entry in place. Whether it is UPTODATE or not, checkout_entry will
* do the right thing.
*/
pos = index_name_pos(the_repository->index, ce->name, ce->ce_namelen);
if (pos >= 0) {
struct cache_entry *old = the_repository->index->cache[pos];
if (ce->ce_mode == old->ce_mode &&
!ce_intent_to_add(old) &&
oideq(&ce->oid, &old->oid)) {
old->ce_flags |= CE_UPDATE;
discard_cache_entry(ce);
return 0;
}
}
add_index_entry(the_repository->index, ce,
ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
return 0;
}
static int read_tree_some(struct tree *tree, const struct pathspec *pathspec)
{
read_tree(the_repository, tree,
pathspec, update_some, NULL);
/* update the index with the given tree's info
* for all args, expanding wildcards, and exit
* with any non-zero return code.
*/
return 0;
}
static int skip_same_name(const struct cache_entry *ce, int pos)
{
while (++pos < the_repository->index->cache_nr &&
!strcmp(the_repository->index->cache[pos]->name, ce->name))
; /* skip */
return pos;
}
static int check_stage(int stage, const struct cache_entry *ce, int pos,
int overlay_mode)
{
while (pos < the_repository->index->cache_nr &&
!strcmp(the_repository->index->cache[pos]->name, ce->name)) {
if (ce_stage(the_repository->index->cache[pos]) == stage)
return 0;
pos++;
}
if (!overlay_mode)
return 0;
if (stage == 2)
return error(_("path '%s' does not have our version"), ce->name);
else
return error(_("path '%s' does not have their version"), ce->name);
}
static int check_stages(unsigned stages, const struct cache_entry *ce, int pos)
{
unsigned seen = 0;
const char *name = ce->name;
while (pos < the_repository->index->cache_nr) {
ce = the_repository->index->cache[pos];
if (strcmp(name, ce->name))
break;
seen |= (1 << ce_stage(ce));
pos++;
}
if ((stages & seen) != stages)
return error(_("path '%s' does not have all necessary versions"),
name);
return 0;
}
static int checkout_stage(int stage, const struct cache_entry *ce, int pos,
const struct checkout *state, int *nr_checkouts,
int overlay_mode)
{
while (pos < the_repository->index->cache_nr &&
!strcmp(the_repository->index->cache[pos]->name, ce->name)) {
if (ce_stage(the_repository->index->cache[pos]) == stage)
return checkout_entry(the_repository->index->cache[pos], state,
NULL, nr_checkouts);
pos++;
}
if (!overlay_mode) {
unlink_entry(ce, NULL);
return 0;
}
if (stage == 2)
return error(_("path '%s' does not have our version"), ce->name);
else
return error(_("path '%s' does not have their version"), ce->name);
}
static int checkout_merged(int pos, const struct checkout *state,
int *nr_checkouts, struct mem_pool *ce_mem_pool,
int conflict_style)
{
struct cache_entry *ce = the_repository->index->cache[pos];
const char *path = ce->name;
mmfile_t ancestor, ours, theirs;
enum ll_merge_result merge_status;
int status;
struct object_id oid;
mmbuffer_t result_buf;
struct object_id threeway[3];
unsigned mode = 0;
struct ll_merge_options ll_opts = LL_MERGE_OPTIONS_INIT;
int renormalize = 0;
memset(threeway, 0, sizeof(threeway));
while (pos < the_repository->index->cache_nr) {
int stage;
stage = ce_stage(ce);
if (!stage || strcmp(path, ce->name))
break;
oidcpy(&threeway[stage - 1], &ce->oid);
if (stage == 2)
mode = create_ce_mode(ce->ce_mode);
pos++;
ce = the_repository->index->cache[pos];
}
if (is_null_oid(&threeway[1]) || is_null_oid(&threeway[2]))
return error(_("path '%s' does not have necessary versions"), path);
read_mmblob(&ancestor, &threeway[0]);
read_mmblob(&ours, &threeway[1]);
read_mmblob(&theirs, &threeway[2]);
git_config_get_bool("merge.renormalize", &renormalize);
ll_opts.renormalize = renormalize;
ll_opts.conflict_style = conflict_style;
merge_status = ll_merge(&result_buf, path, &ancestor, "base",
&ours, "ours", &theirs, "theirs",
state->istate, &ll_opts);
free(ancestor.ptr);
free(ours.ptr);
free(theirs.ptr);
if (merge_status == LL_MERGE_BINARY_CONFLICT)
warning("Cannot merge binary files: %s (%s vs. %s)",
path, "ours", "theirs");
if (merge_status < 0 || !result_buf.ptr) {
free(result_buf.ptr);
return error(_("path '%s': cannot merge"), path);
}
/*
* NEEDSWORK:
* There is absolutely no reason to write this as a blob object
* and create a phony cache entry. This hack is primarily to get
* to the write_entry() machinery that massages the contents to
* work-tree format and writes out which only allows it for a
* cache entry. The code in write_entry() needs to be refactored
* to allow us to feed a <buffer, size, mode> instead of a cache
* entry. Such a refactoring would help merge_recursive as well
* (it also writes the merge result to the object database even
* when it may contain conflicts).
*/
if (write_object_file(result_buf.ptr, result_buf.size, OBJ_BLOB, &oid))
die(_("Unable to add merge result for '%s'"), path);
free(result_buf.ptr);
ce = make_transient_cache_entry(mode, &oid, path, 2, ce_mem_pool);
if (!ce)
die(_("make_cache_entry failed for path '%s'"), path);
status = checkout_entry(ce, state, NULL, nr_checkouts);
return status;
}
static void mark_ce_for_checkout_overlay(struct cache_entry *ce,
char *ps_matched,
const struct checkout_opts *opts)
{
ce->ce_flags &= ~CE_MATCHED;
if (!opts->ignore_skipworktree && ce_skip_worktree(ce))
return;
if (opts->source_tree && !(ce->ce_flags & CE_UPDATE))
/*
* "git checkout tree-ish -- path", but this entry
* is in the original index but is not in tree-ish
* or does not match the pathspec; it will not be
* checked out to the working tree. We will not do
* anything to this entry at all.
*/
return;
/*
* Either this entry came from the tree-ish we are
* checking the paths out of, or we are checking out
* of the index.
*
* If it comes from the tree-ish, we already know it
* matches the pathspec and could just stamp
* CE_MATCHED to it from update_some(). But we still
* need ps_matched and read_tree (and
* eventually tree_entry_interesting) cannot fill
* ps_matched yet. Once it can, we can avoid calling
* match_pathspec() for _all_ entries when
* opts->source_tree != NULL.
*/
if (ce_path_match(the_repository->index, ce, &opts->pathspec, ps_matched))
ce->ce_flags |= CE_MATCHED;
}
static void mark_ce_for_checkout_no_overlay(struct cache_entry *ce,
char *ps_matched,
const struct checkout_opts *opts)
{
ce->ce_flags &= ~CE_MATCHED;
if (!opts->ignore_skipworktree && ce_skip_worktree(ce))
return;
if (ce_path_match(the_repository->index, ce, &opts->pathspec, ps_matched)) {
ce->ce_flags |= CE_MATCHED;
if (opts->source_tree && !(ce->ce_flags & CE_UPDATE))
/*
* In overlay mode, but the path is not in
* tree-ish, which means we should remove it
* from the index and the working tree.
*/
ce->ce_flags |= CE_REMOVE | CE_WT_REMOVE;
}
}
static int checkout_worktree(const struct checkout_opts *opts,
const struct branch_info *info)
{
struct checkout state = CHECKOUT_INIT;
int nr_checkouts = 0, nr_unmerged = 0;
int errs = 0;
int pos;
int pc_workers, pc_threshold;
struct mem_pool ce_mem_pool;
state.force = 1;
state.refresh_cache = 1;
state.istate = the_repository->index;
mem_pool_init(&ce_mem_pool, 0);
get_parallel_checkout_configs(&pc_workers, &pc_threshold);
init_checkout_metadata(&state.meta, info->refname,
info->commit ? &info->commit->object.oid : &info->oid,
NULL);
enable_delayed_checkout(&state);
if (pc_workers > 1)
init_parallel_checkout();
for (pos = 0; pos < the_repository->index->cache_nr; pos++) {
struct cache_entry *ce = the_repository->index->cache[pos];
if (ce->ce_flags & CE_MATCHED) {
if (!ce_stage(ce)) {
errs |= checkout_entry(ce, &state,
NULL, &nr_checkouts);
continue;
}
if (opts->writeout_stage)
errs |= checkout_stage(opts->writeout_stage,
ce, pos,
&state,
&nr_checkouts, opts->overlay_mode);
else if (opts->merge)
errs |= checkout_merged(pos, &state,
&nr_unmerged,
&ce_mem_pool,
opts->conflict_style);
pos = skip_same_name(ce, pos) - 1;
}
}
if (pc_workers > 1)
errs |= run_parallel_checkout(&state, pc_workers, pc_threshold,
NULL, NULL);
mem_pool_discard(&ce_mem_pool, should_validate_cache_entries());
remove_marked_cache_entries(the_repository->index, 1);
remove_scheduled_dirs();
errs |= finish_delayed_checkout(&state, opts->show_progress);
if (opts->count_checkout_paths) {
if (nr_unmerged)
fprintf_ln(stderr, Q_("Recreated %d merge conflict",
"Recreated %d merge conflicts",
nr_unmerged),
nr_unmerged);
if (opts->source_tree)
fprintf_ln(stderr, Q_("Updated %d path from %s",
"Updated %d paths from %s",
nr_checkouts),
nr_checkouts,
repo_find_unique_abbrev(the_repository, &opts->source_tree->object.oid,
DEFAULT_ABBREV));
else if (!nr_unmerged || nr_checkouts)
fprintf_ln(stderr, Q_("Updated %d path from the index",
"Updated %d paths from the index",
nr_checkouts),
nr_checkouts);
}
return errs;
}
static int checkout_paths(const struct checkout_opts *opts,
const struct branch_info *new_branch_info)
{
int pos;
static char *ps_matched;
struct object_id rev;
struct commit *head;
int errs = 0;
struct lock_file lock_file = LOCK_INIT;
int checkout_index;
trace2_cmd_mode(opts->patch_mode ? "patch" : "path");
if (opts->track != BRANCH_TRACK_UNSPECIFIED)
die(_("'%s' cannot be used with updating paths"), "--track");
if (opts->new_branch_log)
die(_("'%s' cannot be used with updating paths"), "-l");
if (opts->ignore_unmerged && opts->patch_mode)
die(_("'%s' cannot be used with updating paths"),
opts->ignore_unmerged_opt);
if (opts->force_detach)
die(_("'%s' cannot be used with updating paths"), "--detach");
if (opts->merge && opts->patch_mode)
die(_("options '%s' and '%s' cannot be used together"), "--merge", "--patch");
if (opts->ignore_unmerged && opts->merge)
die(_("options '%s' and '%s' cannot be used together"),
opts->ignore_unmerged_opt, "-m");
if (opts->new_branch)
die(_("Cannot update paths and switch to branch '%s' at the same time."),
opts->new_branch);
if (!opts->checkout_worktree && !opts->checkout_index)
die(_("neither '%s' or '%s' is specified"),
"--staged", "--worktree");
if (!opts->checkout_worktree && !opts->from_treeish)
die(_("'%s' must be used when '%s' is not specified"),
"--worktree", "--source");
/*
* Reject --staged option to the restore command when combined with
* merge-related options. Use the accept_ref flag to distinguish it
* from the checkout command, which does not accept --staged anyway.
*
* `restore --ours|--theirs --worktree --staged` could mean resolving
* conflicted paths to one side in both the worktree and the index,
* but does not currently.
*
* `restore --merge|--conflict=<style>` already recreates conflicts
* in both the worktree and the index, so adding --staged would be
* meaningless.
*/
if (!opts->accept_ref && opts->checkout_index) {
if (opts->writeout_stage)
die(_("'%s' or '%s' cannot be used with %s"),
"--ours", "--theirs", "--staged");
if (opts->merge)
die(_("'%s' or '%s' cannot be used with %s"),
"--merge", "--conflict", "--staged");
}
/*
* recreating unmerged index entries and writing out data from
* unmerged index entries would make no sense when checking out
* of a tree-ish.
*/
if ((opts->merge || opts->writeout_stage) && opts->source_tree)
die(_("'%s', '%s', or '%s' cannot be used when checking out of a tree"),
"--merge", "--ours", "--theirs");
if (opts->patch_mode) {
enum add_p_mode patch_mode;
const char *rev = new_branch_info->name;
char rev_oid[GIT_MAX_HEXSZ + 1];
/*
* Since rev can be in the form of `<a>...<b>` (which is not
* recognized by diff-index), we will always replace the name
* with the hex of the commit (whether it's in `...` form or
* not) for the run_add_interactive() machinery to work
* properly. However, there is special logic for the HEAD case
* so we mustn't replace that. Also, when we were given a
* tree-object, new_branch_info->commit would be NULL, but we
* do not have to do any replacement, either.
*/
if (rev && new_branch_info->commit && strcmp(rev, "HEAD"))
rev = oid_to_hex_r(rev_oid, &new_branch_info->commit->object.oid);
if (opts->checkout_index && opts->checkout_worktree)
patch_mode = ADD_P_CHECKOUT;
else if (opts->checkout_index && !opts->checkout_worktree)
patch_mode = ADD_P_RESET;
else if (!opts->checkout_index && opts->checkout_worktree)
patch_mode = ADD_P_WORKTREE;
else
BUG("either flag must have been set, worktree=%d, index=%d",
opts->checkout_worktree, opts->checkout_index);
return !!run_add_p(the_repository, patch_mode, rev,
&opts->pathspec);
}
repo_hold_locked_index(the_repository, &lock_file, LOCK_DIE_ON_ERROR);
if (repo_read_index_preload(the_repository, &opts->pathspec, 0) < 0)
return error(_("index file corrupt"));
if (opts->source_tree)
read_tree_some(opts->source_tree, &opts->pathspec);
if (opts->merge)
unmerge_index(the_repository->index, &opts->pathspec, CE_MATCHED);
ps_matched = xcalloc(opts->pathspec.nr, 1);
/*
* Make sure all pathspecs participated in locating the paths
* to be checked out.
*/
for (pos = 0; pos < the_repository->index->cache_nr; pos++)
if (opts->overlay_mode)
mark_ce_for_checkout_overlay(the_repository->index->cache[pos],
ps_matched,
opts);
else
mark_ce_for_checkout_no_overlay(the_repository->index->cache[pos],
ps_matched,
opts);
if (report_path_error(ps_matched, &opts->pathspec)) {
free(ps_matched);
return 1;
}
free(ps_matched);
/* Any unmerged paths? */
for (pos = 0; pos < the_repository->index->cache_nr; pos++) {
const struct cache_entry *ce = the_repository->index->cache[pos];
if (ce->ce_flags & CE_MATCHED) {
if (!ce_stage(ce))
continue;
if (opts->ignore_unmerged) {
if (!opts->quiet)
warning(_("path '%s' is unmerged"), ce->name);
} else if (opts->writeout_stage) {
errs |= check_stage(opts->writeout_stage, ce, pos, opts->overlay_mode);
} else if (opts->merge) {
errs |= check_stages((1<<2) | (1<<3), ce, pos);
} else {
errs = 1;
error(_("path '%s' is unmerged"), ce->name);
}
pos = skip_same_name(ce, pos) - 1;
}
}
if (errs)
return 1;
/* Now we are committed to check them out */
if (opts->checkout_worktree)
errs |= checkout_worktree(opts, new_branch_info);
else
remove_marked_cache_entries(the_repository->index, 1);
/*
* Allow updating the index when checking out from the index.
* This is to save new stat info.
*/
if (opts->checkout_worktree && !opts->checkout_index && !opts->source_tree)
checkout_index = 1;
else
checkout_index = opts->checkout_index;
if (checkout_index) {
if (write_locked_index(the_repository->index, &lock_file, COMMIT_LOCK))
die(_("unable to write new index file"));
} else {
/*
* NEEDSWORK: if --worktree is not specified, we
* should save stat info of checked out files in the
* index to avoid the next (potentially costly)
* refresh. But it's a bit tricker to do...
*/
rollback_lock_file(&lock_file);
}
refs_read_ref_full(get_main_ref_store(the_repository), "HEAD", 0,
&rev, NULL);
head = lookup_commit_reference_gently(the_repository, &rev, 1);
errs |= post_checkout_hook(head, head, 0);
return errs;
}
static void show_local_changes(struct object *head,
const struct diff_options *opts)
{
struct rev_info rev;
/* I think we want full paths, even if we're in a subdirectory. */
repo_init_revisions(the_repository, &rev, NULL);
rev.diffopt.flags = opts->flags;
rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS;
rev.diffopt.flags.recursive = 1;
diff_setup_done(&rev.diffopt);
add_pending_object(&rev, head, NULL);
run_diff_index(&rev, 0);
release_revisions(&rev);
}
static void describe_detached_head(const char *msg, struct commit *commit)
{
struct strbuf sb = STRBUF_INIT;
if (!repo_parse_commit(the_repository, commit))
pp_commit_easy(CMIT_FMT_ONELINE, commit, &sb);
if (print_sha1_ellipsis()) {
fprintf(stderr, "%s %s... %s\n", msg,
repo_find_unique_abbrev(the_repository, &commit->object.oid, DEFAULT_ABBREV),
sb.buf);
} else {
fprintf(stderr, "%s %s %s\n", msg,
repo_find_unique_abbrev(the_repository, &commit->object.oid, DEFAULT_ABBREV),
sb.buf);
}
strbuf_release(&sb);
}
static int reset_tree(struct tree *tree, const struct checkout_opts *o,
int worktree, int *writeout_error,
struct branch_info *info)
{
struct unpack_trees_options opts;
struct tree_desc tree_desc;
memset(&opts, 0, sizeof(opts));
opts.head_idx = -1;
opts.update = worktree;
opts.skip_unmerged = !worktree;
opts.reset = o->force ? UNPACK_RESET_OVERWRITE_UNTRACKED :
UNPACK_RESET_PROTECT_UNTRACKED;
opts.preserve_ignored = (!o->force && !o->overwrite_ignore);
opts.merge = 1;
opts.fn = oneway_merge;
opts.verbose_update = o->show_progress;
opts.src_index = the_repository->index;
opts.dst_index = the_repository->index;
init_checkout_metadata(&opts.meta, info->refname,
info->commit ? &info->commit->object.oid : null_oid(the_hash_algo),
NULL);
if (parse_tree(tree) < 0)
return 128;
init_tree_desc(&tree_desc, &tree->object.oid, tree->buffer, tree->size);
switch (unpack_trees(1, &tree_desc, &opts)) {
case -2:
*writeout_error = 1;
/*
* We return 0 nevertheless, as the index is all right
* and more importantly we have made best efforts to
* update paths in the work tree, and we cannot revert
* them.
*/
/* fallthrough */
case 0:
return 0;
default:
return 128;
}
}
static void setup_branch_path(struct branch_info *branch)
{
struct strbuf buf = STRBUF_INIT;
/*
* If this is a ref, resolve it; otherwise, look up the OID for our
* expression. Failure here is okay.
*/
if (!repo_dwim_ref(the_repository, branch->name, strlen(branch->name),
&branch->oid, &branch->refname, 0))
repo_get_oid_committish(the_repository, branch->name, &branch->oid);
copy_branchname(&buf, branch->name, INTERPRET_BRANCH_LOCAL);
if (strcmp(buf.buf, branch->name)) {
free(branch->name);
branch->name = xstrdup(buf.buf);
}
strbuf_splice(&buf, 0, 0, "refs/heads/", 11);
free(branch->path);
branch->path = strbuf_detach(&buf, NULL);
}
static void init_topts(struct unpack_trees_options *topts, int merge,
int show_progress, int overwrite_ignore,
struct commit *old_commit)
{
memset(topts, 0, sizeof(*topts));
topts->head_idx = -1;
topts->src_index = the_repository->index;
topts->dst_index = the_repository->index;
setup_unpack_trees_porcelain(topts, "checkout");
topts->initial_checkout = is_index_unborn(the_repository->index);
topts->update = 1;
topts->merge = 1;
topts->quiet = merge && old_commit;
topts->verbose_update = show_progress;
topts->fn = twoway_merge;
topts->preserve_ignored = !overwrite_ignore;
}
static int merge_working_tree(const struct checkout_opts *opts,
struct branch_info *old_branch_info,
struct branch_info *new_branch_info,
int *writeout_error)
{
int ret;
struct lock_file lock_file = LOCK_INIT;
struct tree *new_tree;
repo_hold_locked_index(the_repository, &lock_file, LOCK_DIE_ON_ERROR);
if (repo_read_index_preload(the_repository, NULL, 0) < 0)
return error(_("index file corrupt"));
resolve_undo_clear_index(the_repository->index);
if (opts->new_orphan_branch && opts->orphan_from_empty_tree) {
if (new_branch_info->commit)
BUG("'switch --orphan' should never accept a commit as starting point");
new_tree = parse_tree_indirect(the_hash_algo->empty_tree);
if (!new_tree)
BUG("unable to read empty tree");
} else {
new_tree = repo_get_commit_tree(the_repository,
new_branch_info->commit);
if (!new_tree)
return error(_("unable to read tree (%s)"),
oid_to_hex(&new_branch_info->commit->object.oid));
}
if (opts->discard_changes) {
ret = reset_tree(new_tree, opts, 1, writeout_error, new_branch_info);
if (ret)
return ret;
} else {
struct tree_desc trees[2];
struct tree *tree;
struct unpack_trees_options topts;
const struct object_id *old_commit_oid;
refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL, NULL);
if (unmerged_index(the_repository->index)) {
error(_("you need to resolve your current index first"));
return 1;
}
/* 2-way merge to the new branch */
init_topts(&topts, opts->merge, opts->show_progress,
opts->overwrite_ignore, old_branch_info->commit);
init_checkout_metadata(&topts.meta, new_branch_info->refname,
new_branch_info->commit ?
&new_branch_info->commit->object.oid :
&new_branch_info->oid, NULL);
old_commit_oid = old_branch_info->commit ?
&old_branch_info->commit->object.oid :
the_hash_algo->empty_tree;
tree = parse_tree_indirect(old_commit_oid);
if (!tree)
die(_("unable to parse commit %s"),
oid_to_hex(old_commit_oid));
init_tree_desc(&trees[0], &tree->object.oid,
tree->buffer, tree->size);
if (parse_tree(new_tree) < 0)
exit(128);
tree = new_tree;
init_tree_desc(&trees[1], &tree->object.oid,
tree->buffer, tree->size);
ret = unpack_trees(2, trees, &topts);
clear_unpack_trees_porcelain(&topts);
if (ret == -1) {
/*
* Unpack couldn't do a trivial merge; either
* give up or do a real merge, depending on
* whether the merge flag was used.
*/
struct tree *work;
struct tree *old_tree;
struct merge_options o;
struct strbuf sb = STRBUF_INIT;
struct strbuf old_commit_shortname = STRBUF_INIT;
if (!opts->merge)
return 1;
/*
* Without old_branch_info->commit, the below is the same as
* the two-tree unpack we already tried and failed.
*/
if (!old_branch_info->commit)
return 1;
old_tree = repo_get_commit_tree(the_repository,
old_branch_info->commit);
if (repo_index_has_changes(the_repository, old_tree, &sb))
die(_("cannot continue with staged changes in "
"the following files:\n%s"), sb.buf);
strbuf_release(&sb);
/* Do more real merge */
/*
* We update the index fully, then write the
* tree from the index, then merge the new
* branch with the current tree, with the old
* branch as the base. Then we reset the index
* (but not the working tree) to the new
* branch, leaving the working tree as the
* merged version, but skipping unmerged
* entries in the index.
*/
add_files_to_cache(the_repository, NULL, NULL, NULL, 0,
0);
init_ui_merge_options(&o, the_repository);
o.verbosity = 0;
work = write_in_core_index_as_tree(the_repository);
ret = reset_tree(new_tree,
opts, 1,
writeout_error, new_branch_info);
if (ret)
return ret;
o.ancestor = old_branch_info->name;
if (!old_branch_info->name) {
strbuf_add_unique_abbrev(&old_commit_shortname,
&old_branch_info->commit->object.oid,
DEFAULT_ABBREV);
o.ancestor = old_commit_shortname.buf;
}
o.branch1 = new_branch_info->name;
o.branch2 = "local";
o.conflict_style = opts->conflict_style;
ret = merge_ort_nonrecursive(&o,
new_tree,
work,
old_tree);
if (ret < 0)
exit(128);
ret = reset_tree(new_tree,
opts, 0,
writeout_error, new_branch_info);
strbuf_release(&o.obuf);
strbuf_release(&old_commit_shortname);
if (ret)
return ret;
}
}
if (!cache_tree_fully_valid(the_repository->index->cache_tree))
cache_tree_update(the_repository->index, WRITE_TREE_SILENT | WRITE_TREE_REPAIR);
if (write_locked_index(the_repository->index, &lock_file, COMMIT_LOCK))
die(_("unable to write new index file"));
if (!opts->discard_changes && !opts->quiet && new_branch_info->commit)
show_local_changes(&new_branch_info->commit->object, &opts->diff_options);
return 0;
}
static void report_tracking(struct branch_info *new_branch_info)
{
struct strbuf sb = STRBUF_INIT;
struct branch *branch = branch_get(new_branch_info->name);
if (!format_tracking_info(branch, &sb, AHEAD_BEHIND_FULL, 1))
return;
fputs(sb.buf, stdout);
strbuf_release(&sb);
}
static void update_refs_for_switch(const struct checkout_opts *opts,
struct branch_info *old_branch_info,
struct branch_info *new_branch_info)
{
struct strbuf msg = STRBUF_INIT;
const char *old_desc, *reflog_msg;
if (opts->new_branch) {
if (opts->new_orphan_branch) {
enum log_refs_config log_all_ref_updates =
repo_settings_get_log_all_ref_updates(the_repository);
char *refname;
refname = mkpathdup("refs/heads/%s", opts->new_orphan_branch);
if (opts->new_branch_log &&
!should_autocreate_reflog(log_all_ref_updates, refname)) {
int ret;
struct strbuf err = STRBUF_INIT;
ret = refs_create_reflog(get_main_ref_store(the_repository),
refname, &err);
if (ret) {
fprintf(stderr, _("Can not do reflog for '%s': %s\n"),
opts->new_orphan_branch, err.buf);
strbuf_release(&err);
free(refname);
return;
}
strbuf_release(&err);
}
free(refname);
}
else
create_branch(the_repository,
opts->new_branch, new_branch_info->name,
opts->new_branch_force ? 1 : 0,
opts->new_branch_force ? 1 : 0,
opts->new_branch_log,
opts->quiet,
opts->track,
0);
free(new_branch_info->name);
free(new_branch_info->refname);
new_branch_info->name = xstrdup(opts->new_branch);
setup_branch_path(new_branch_info);
}
old_desc = old_branch_info->name;
if (!old_desc && old_branch_info->commit)
old_desc = oid_to_hex(&old_branch_info->commit->object.oid);
reflog_msg = getenv("GIT_REFLOG_ACTION");