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tag: v1.5.6.6
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#include "cache.h"
#include "builtin.h"
#include "parse-options.h"
#include "refs.h"
#include "commit.h"
#include "tree.h"
#include "tree-walk.h"
#include "unpack-trees.h"
#include "dir.h"
#include "run-command.h"
#include "merge-recursive.h"
#include "branch.h"
#include "diff.h"
#include "revision.h"
#include "remote.h"

static const char * const checkout_usage[] = {
"git checkout [options] <branch>",
"git checkout [options] [<branch>] -- <file>...",
NULL,
};

static int post_checkout_hook(struct commit *old, struct commit *new,
int changed)
{
struct child_process proc;
const char *name = git_path("hooks/post-checkout");
const char *argv[5];

if (access(name, X_OK) < 0)
return 0;

memset(&proc, 0, sizeof(proc));
argv[0] = name;
argv[1] = xstrdup(sha1_to_hex(old->object.sha1));
argv[2] = xstrdup(sha1_to_hex(new->object.sha1));
argv[3] = changed ? "1" : "0";
argv[4] = NULL;
proc.argv = argv;
proc.no_stdin = 1;
proc.stdout_to_stderr = 1;
return run_command(&proc);
}

static int update_some(const unsigned char *sha1, const char *base, int baselen,
const char *pathname, unsigned mode, int stage)
{
int len;
struct cache_entry *ce;

if (S_ISGITLINK(mode))
return 0;

if (S_ISDIR(mode))
return READ_TREE_RECURSIVE;

len = baselen + strlen(pathname);
ce = xcalloc(1, cache_entry_size(len));
hashcpy(ce->sha1, sha1);
memcpy(ce->name, base, baselen);
memcpy(ce->name + baselen, pathname, len - baselen);
ce->ce_flags = create_ce_flags(len, 0);
ce->ce_mode = create_ce_mode(mode);
add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
return 0;
}

static int read_tree_some(struct tree *tree, const char **pathspec)
{
read_tree_recursive(tree, "", 0, 0, pathspec, update_some);

/* 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 checkout_paths(struct tree *source_tree, const char **pathspec)
{
int pos;
struct checkout state;
static char *ps_matched;
unsigned char rev[20];
int flag;
struct commit *head;
int errs = 0;

int newfd;
struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));

newfd = hold_locked_index(lock_file, 1);
read_cache();

if (source_tree)
read_tree_some(source_tree, pathspec);

for (pos = 0; pathspec[pos]; pos++)
;
ps_matched = xcalloc(1, pos);

for (pos = 0; pos < active_nr; pos++) {
struct cache_entry *ce = active_cache[pos];
pathspec_match(pathspec, ps_matched, ce->name, 0);
}

if (report_path_error(ps_matched, pathspec, 0))
return 1;

/* Now we are committed to check them out */
memset(&state, 0, sizeof(state));
state.force = 1;
state.refresh_cache = 1;
for (pos = 0; pos < active_nr; pos++) {
struct cache_entry *ce = active_cache[pos];
if (pathspec_match(pathspec, NULL, ce->name, 0)) {
errs |= checkout_entry(ce, &state, NULL);
}
}

if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(lock_file))
die("unable to write new index file");

resolve_ref("HEAD", rev, 0, &flag);
head = lookup_commit_reference_gently(rev, 1);

errs |= post_checkout_hook(head, head, 0);
return errs;
}

static void show_local_changes(struct object *head)
{
struct rev_info rev;
/* I think we want full paths, even if we're in a subdirectory. */
init_revisions(&rev, NULL);
rev.abbrev = 0;
rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS;
add_pending_object(&rev, head, NULL);
run_diff_index(&rev, 0);
}

static void describe_detached_head(char *msg, struct commit *commit)
{
struct strbuf sb;
strbuf_init(&sb, 0);
parse_commit(commit);
pretty_print_commit(CMIT_FMT_ONELINE, commit, &sb, 0, NULL, NULL, 0, 0);
fprintf(stderr, "%s %s... %s\n", msg,
find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), sb.buf);
strbuf_release(&sb);
}

struct checkout_opts {
int quiet;
int merge;
int force;
int writeout_error;

char *new_branch;
int new_branch_log;
enum branch_track track;
};

static int reset_tree(struct tree *tree, struct checkout_opts *o, int worktree)
{
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 = 1;
opts.merge = 1;
opts.fn = oneway_merge;
opts.verbose_update = !o->quiet;
opts.src_index = &the_index;
opts.dst_index = &the_index;
parse_tree(tree);
init_tree_desc(&tree_desc, tree->buffer, tree->size);
switch (unpack_trees(1, &tree_desc, &opts)) {
case -2:
o->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.
*/
case 0:
return 0;
default:
return 128;
}
}

struct branch_info {
const char *name; /* The short name used */
const char *path; /* The full name of a real branch */
struct commit *commit; /* The named commit */
};

static void setup_branch_path(struct branch_info *branch)
{
struct strbuf buf;
strbuf_init(&buf, 0);
strbuf_addstr(&buf, "refs/heads/");
strbuf_addstr(&buf, branch->name);
branch->path = strbuf_detach(&buf, NULL);
}

static int merge_working_tree(struct checkout_opts *opts,
struct branch_info *old, struct branch_info *new)
{
int ret;
struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
int newfd = hold_locked_index(lock_file, 1);
read_cache();

if (opts->force) {
ret = reset_tree(new->commit->tree, opts, 1);
if (ret)
return ret;
} else {
struct tree_desc trees[2];
struct tree *tree;
struct unpack_trees_options topts;

memset(&topts, 0, sizeof(topts));
topts.head_idx = -1;
topts.src_index = &the_index;
topts.dst_index = &the_index;

topts.msgs.not_uptodate_file = "You have local changes to '%s'; cannot switch branches.";

refresh_cache(REFRESH_QUIET);

if (unmerged_cache()) {
error("you need to resolve your current index first");
return 1;
}

/* 2-way merge to the new branch */
topts.update = 1;
topts.merge = 1;
topts.gently = opts->merge;
topts.verbose_update = !opts->quiet;
topts.fn = twoway_merge;
topts.dir = xcalloc(1, sizeof(*topts.dir));
topts.dir->show_ignored = 1;
topts.dir->exclude_per_dir = ".gitignore";
tree = parse_tree_indirect(old->commit->object.sha1);
init_tree_desc(&trees[0], tree->buffer, tree->size);
tree = parse_tree_indirect(new->commit->object.sha1);
init_tree_desc(&trees[1], tree->buffer, tree->size);

ret = unpack_trees(2, trees, &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 *result;
struct tree *work;
if (!opts->merge)
return 1;
parse_commit(old->commit);

/* 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(NULL, NULL, 0);
work = write_tree_from_memory();

ret = reset_tree(new->commit->tree, opts, 1);
if (ret)
return ret;
merge_trees(new->commit->tree, work, old->commit->tree,
new->name, "local", &result);
ret = reset_tree(new->commit->tree, opts, 0);
if (ret)
return ret;
}
}

if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(lock_file))
die("unable to write new index file");

if (!opts->force)
show_local_changes(&new->commit->object);

return 0;
}

static void report_tracking(struct branch_info *new, struct checkout_opts *opts)
{
/*
* We have switched to a new branch; is it building on
* top of another branch, and if so does that other branch
* have changes we do not have yet?
*/
char *base;
unsigned char sha1[20];
struct commit *ours, *theirs;
char symmetric[84];
struct rev_info revs;
const char *rev_argv[10];
int rev_argc;
int num_ours, num_theirs;
const char *remote_msg;
struct branch *branch = branch_get(new->name);

/*
* Nothing to report unless we are marked to build on top of
* somebody else.
*/
if (!branch || !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
return;

/*
* If what we used to build on no longer exists, there is
* nothing to report.
*/
base = branch->merge[0]->dst;
if (!resolve_ref(base, sha1, 1, NULL))
return;

theirs = lookup_commit(sha1);
ours = new->commit;
if (!hashcmp(sha1, ours->object.sha1))
return; /* we are the same */

/* Run "rev-list --left-right ours...theirs" internally... */
rev_argc = 0;
rev_argv[rev_argc++] = NULL;
rev_argv[rev_argc++] = "--left-right";
rev_argv[rev_argc++] = symmetric;
rev_argv[rev_argc++] = "--";
rev_argv[rev_argc] = NULL;

strcpy(symmetric, sha1_to_hex(ours->object.sha1));
strcpy(symmetric + 40, "...");
strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));

init_revisions(&revs, NULL);
setup_revisions(rev_argc, rev_argv, &revs, NULL);
prepare_revision_walk(&revs);

/* ... and count the commits on each side. */
num_ours = 0;
num_theirs = 0;
while (1) {
struct commit *c = get_revision(&revs);
if (!c)
break;
if (c->object.flags & SYMMETRIC_LEFT)
num_ours++;
else
num_theirs++;
}

if (!prefixcmp(base, "refs/remotes/")) {
remote_msg = " remote";
base += strlen("refs/remotes/");
} else {
remote_msg = "";
}

if (!num_theirs)
printf("Your branch is ahead of the tracked%s branch '%s' "
"by %d commit%s.\n",
remote_msg, base,
num_ours, (num_ours == 1) ? "" : "s");
else if (!num_ours)
printf("Your branch is behind the tracked%s branch '%s' "
"by %d commit%s,\n"
"and can be fast-forwarded.\n",
remote_msg, base,
num_theirs, (num_theirs == 1) ? "" : "s");
else
printf("Your branch and the tracked%s branch '%s' "
"have diverged,\nand respectively "
"have %d and %d different commit(s) each.\n",
remote_msg, base,
num_ours, num_theirs);
}

static void update_refs_for_switch(struct checkout_opts *opts,
struct branch_info *old,
struct branch_info *new)
{
struct strbuf msg;
const char *old_desc;
if (opts->new_branch) {
create_branch(old->name, opts->new_branch, new->name, 0,
opts->new_branch_log, opts->track);
new->name = opts->new_branch;
setup_branch_path(new);
}

strbuf_init(&msg, 0);
old_desc = old->name;
if (!old_desc)
old_desc = sha1_to_hex(old->commit->object.sha1);
strbuf_addf(&msg, "checkout: moving from %s to %s",
old_desc, new->name);

if (new->path) {
create_symref("HEAD", new->path, msg.buf);
if (!opts->quiet) {
if (old->path && !strcmp(new->path, old->path))
fprintf(stderr, "Already on \"%s\"\n",
new->name);
else
fprintf(stderr, "Switched to%s branch \"%s\"\n",
opts->new_branch ? " a new" : "",
new->name);
}
} else if (strcmp(new->name, "HEAD")) {
update_ref(msg.buf, "HEAD", new->commit->object.sha1, NULL,
REF_NODEREF, DIE_ON_ERR);
if (!opts->quiet) {
if (old->path)
fprintf(stderr, "Note: moving to \"%s\" which isn't a local branch\nIf you want to create a new branch from this checkout, you may do so\n(now or later) by using -b with the checkout command again. Example:\n git checkout -b <new_branch_name>\n", new->name);
describe_detached_head("HEAD is now at", new->commit);
}
}
remove_branch_state();
strbuf_release(&msg);
if (!opts->quiet && (new->path || !strcmp(new->name, "HEAD")))
report_tracking(new, opts);
}

static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
{
int ret = 0;
struct branch_info old;
unsigned char rev[20];
int flag;
memset(&old, 0, sizeof(old));
old.path = resolve_ref("HEAD", rev, 0, &flag);
old.commit = lookup_commit_reference_gently(rev, 1);
if (!(flag & REF_ISSYMREF))
old.path = NULL;

if (old.path && !prefixcmp(old.path, "refs/heads/"))
old.name = old.path + strlen("refs/heads/");

if (!new->name) {
new->name = "HEAD";
new->commit = old.commit;
if (!new->commit)
die("You are on a branch yet to be born");
parse_commit(new->commit);
}

/*
* If the new thing isn't a branch and isn't HEAD and we're
* not starting a new branch, and we want messages, and we
* weren't on a branch, and we're moving to a new commit,
* describe the old commit.
*/
if (!new->path && strcmp(new->name, "HEAD") && !opts->new_branch &&
!opts->quiet && !old.path && new->commit != old.commit)
describe_detached_head("Previous HEAD position was", old.commit);

if (!old.commit) {
if (!opts->quiet) {
fprintf(stderr, "warning: You appear to be on a branch yet to be born.\n");
fprintf(stderr, "warning: Forcing checkout of %s.\n", new->name);
}
opts->force = 1;
}

ret = merge_working_tree(opts, &old, new);
if (ret)
return ret;

update_refs_for_switch(opts, &old, new);

ret = post_checkout_hook(old.commit, new->commit, 1);
return ret || opts->writeout_error;
}

int cmd_checkout(int argc, const char **argv, const char *prefix)
{
struct checkout_opts opts;
unsigned char rev[20];
const char *arg;
struct branch_info new;
struct tree *source_tree = NULL;
struct option options[] = {
OPT__QUIET(&opts.quiet),
OPT_STRING('b', NULL, &opts.new_branch, "new branch", "branch"),
OPT_BOOLEAN('l', NULL, &opts.new_branch_log, "log for new branch"),
OPT_SET_INT('t', "track", &opts.track, "track",
BRANCH_TRACK_EXPLICIT),
OPT_BOOLEAN('f', NULL, &opts.force, "force"),
OPT_BOOLEAN('m', NULL, &opts.merge, "merge"),
OPT_END(),
};

memset(&opts, 0, sizeof(opts));
memset(&new, 0, sizeof(new));

git_config(git_default_config, NULL);

opts.track = git_branch_track;

argc = parse_options(argc, argv, options, checkout_usage,
PARSE_OPT_KEEP_DASHDASH);
if (argc) {
arg = argv[0];
if (get_sha1(arg, rev))
;
else if ((new.commit = lookup_commit_reference_gently(rev, 1))) {
new.name = arg;
setup_branch_path(&new);
if (resolve_ref(new.path, rev, 1, NULL))
new.commit = lookup_commit_reference(rev);
else
new.path = NULL;
parse_commit(new.commit);
source_tree = new.commit->tree;
argv++;
argc--;
} else if ((source_tree = parse_tree_indirect(rev))) {
argv++;
argc--;
}
}

if (argc && !strcmp(argv[0], "--")) {
argv++;
argc--;
}

if (!opts.new_branch && (opts.track != git_branch_track))
die("git checkout: --track and --no-track require -b");

if (opts.force && opts.merge)
die("git checkout: -f and -m are incompatible");

if (argc) {
const char **pathspec = get_pathspec(prefix, argv);

if (!pathspec)
die("invalid path specification");

/* Checkout paths */
if (opts.new_branch || opts.force || opts.merge) {
if (argc == 1) {
die("git checkout: updating paths is incompatible with switching branches/forcing\nDid you intend to checkout '%s' which can not be resolved as commit?", argv[0]);
} else {
die("git checkout: updating paths is incompatible with switching branches/forcing");
}
}

return checkout_paths(source_tree, pathspec);
}

if (new.name && !new.commit) {
die("Cannot switch branch to a non-commit.");
}

return switch_branches(&opts, &new);
}
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