git/walker.c
Junio C Hamano 6047b28eb7 Merge branch 'en/header-split-cleanup'
Split key function and data structure definitions out of cache.h to
new header files and adjust the users.

* en/header-split-cleanup:
  csum-file.h: remove unnecessary inclusion of cache.h
  write-or-die.h: move declarations for write-or-die.c functions from cache.h
  treewide: remove cache.h inclusion due to setup.h changes
  setup.h: move declarations for setup.c functions from cache.h
  treewide: remove cache.h inclusion due to environment.h changes
  environment.h: move declarations for environment.c functions from cache.h
  treewide: remove unnecessary includes of cache.h
  wrapper.h: move declarations for wrapper.c functions from cache.h
  path.h: move function declarations for path.c functions from cache.h
  cache.h: remove expand_user_path()
  abspath.h: move absolute path functions from cache.h
  environment: move comment_line_char from cache.h
  treewide: remove unnecessary cache.h inclusion from several sources
  treewide: remove unnecessary inclusion of gettext.h
  treewide: be explicit about dependence on gettext.h
  treewide: remove unnecessary cache.h inclusion from a few headers
2023-04-06 13:38:31 -07:00

354 lines
7.8 KiB
C

#include "cache.h"
#include "gettext.h"
#include "hex.h"
#include "walker.h"
#include "repository.h"
#include "object-store.h"
#include "commit.h"
#include "tree.h"
#include "tree-walk.h"
#include "tag.h"
#include "blob.h"
#include "refs.h"
#include "progress.h"
static struct object_id current_commit_oid;
void walker_say(struct walker *walker, const char *fmt, ...)
{
if (walker->get_verbosely) {
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
}
static void report_missing(const struct object *obj)
{
fprintf(stderr, "Cannot obtain needed %s %s\n",
obj->type ? type_name(obj->type): "object",
oid_to_hex(&obj->oid));
if (!is_null_oid(&current_commit_oid))
fprintf(stderr, "while processing commit %s.\n",
oid_to_hex(&current_commit_oid));
}
static int process(struct walker *walker, struct object *obj);
static int process_tree(struct walker *walker, struct tree *tree)
{
struct tree_desc desc;
struct name_entry entry;
if (parse_tree(tree))
return -1;
init_tree_desc(&desc, tree->buffer, tree->size);
while (tree_entry(&desc, &entry)) {
struct object *obj = NULL;
/* submodule commits are not stored in the superproject */
if (S_ISGITLINK(entry.mode))
continue;
if (S_ISDIR(entry.mode)) {
struct tree *tree = lookup_tree(the_repository,
&entry.oid);
if (tree)
obj = &tree->object;
}
else {
struct blob *blob = lookup_blob(the_repository,
&entry.oid);
if (blob)
obj = &blob->object;
}
if (!obj || process(walker, obj))
return -1;
}
free_tree_buffer(tree);
return 0;
}
/* Remember to update object flag allocation in object.h */
#define COMPLETE (1U << 0)
#define SEEN (1U << 1)
#define TO_SCAN (1U << 2)
static struct commit_list *complete = NULL;
static int process_commit(struct walker *walker, struct commit *commit)
{
struct commit_list *parents;
if (repo_parse_commit(the_repository, commit))
return -1;
while (complete && complete->item->date >= commit->date) {
pop_most_recent_commit(&complete, COMPLETE);
}
if (commit->object.flags & COMPLETE)
return 0;
oidcpy(&current_commit_oid, &commit->object.oid);
walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
if (process(walker, &repo_get_commit_tree(the_repository, commit)->object))
return -1;
for (parents = commit->parents; parents; parents = parents->next) {
if (process(walker, &parents->item->object))
return -1;
}
return 0;
}
static int process_tag(struct walker *walker, struct tag *tag)
{
if (parse_tag(tag))
return -1;
return process(walker, tag->tagged);
}
static struct object_list *process_queue = NULL;
static struct object_list **process_queue_end = &process_queue;
static int process_object(struct walker *walker, struct object *obj)
{
if (obj->type == OBJ_COMMIT) {
if (process_commit(walker, (struct commit *)obj))
return -1;
return 0;
}
if (obj->type == OBJ_TREE) {
if (process_tree(walker, (struct tree *)obj))
return -1;
return 0;
}
if (obj->type == OBJ_BLOB) {
return 0;
}
if (obj->type == OBJ_TAG) {
if (process_tag(walker, (struct tag *)obj))
return -1;
return 0;
}
return error("Unable to determine requirements "
"of type %s for %s",
type_name(obj->type), oid_to_hex(&obj->oid));
}
static int process(struct walker *walker, struct object *obj)
{
if (obj->flags & SEEN)
return 0;
obj->flags |= SEEN;
if (repo_has_object_file(the_repository, &obj->oid)) {
/* We already have it, so we should scan it now. */
obj->flags |= TO_SCAN;
}
else {
if (obj->flags & COMPLETE)
return 0;
walker->prefetch(walker, obj->oid.hash);
}
object_list_insert(obj, process_queue_end);
process_queue_end = &(*process_queue_end)->next;
return 0;
}
static int loop(struct walker *walker)
{
struct object_list *elem;
struct progress *progress = NULL;
uint64_t nr = 0;
if (walker->get_progress)
progress = start_delayed_progress(_("Fetching objects"), 0);
while (process_queue) {
struct object *obj = process_queue->item;
elem = process_queue;
process_queue = elem->next;
free(elem);
if (!process_queue)
process_queue_end = &process_queue;
/* If we are not scanning this object, we placed it in
* the queue because we needed to fetch it first.
*/
if (! (obj->flags & TO_SCAN)) {
if (walker->fetch(walker, obj->oid.hash)) {
stop_progress(&progress);
report_missing(obj);
return -1;
}
}
if (!obj->type)
parse_object(the_repository, &obj->oid);
if (process_object(walker, obj)) {
stop_progress(&progress);
return -1;
}
display_progress(progress, ++nr);
}
stop_progress(&progress);
return 0;
}
static int interpret_target(struct walker *walker, char *target, struct object_id *oid)
{
if (!get_oid_hex(target, oid))
return 0;
if (!check_refname_format(target, 0)) {
struct ref *ref = alloc_ref(target);
if (!walker->fetch_ref(walker, ref)) {
oidcpy(oid, &ref->old_oid);
free(ref);
return 0;
}
free(ref);
}
return -1;
}
static int mark_complete(const char *path UNUSED,
const struct object_id *oid,
int flag UNUSED,
void *cb_data UNUSED)
{
struct commit *commit = lookup_commit_reference_gently(the_repository,
oid, 1);
if (commit) {
commit->object.flags |= COMPLETE;
commit_list_insert(commit, &complete);
}
return 0;
}
int walker_targets_stdin(char ***target, const char ***write_ref)
{
int targets = 0, targets_alloc = 0;
struct strbuf buf = STRBUF_INIT;
*target = NULL; *write_ref = NULL;
while (1) {
char *rf_one = NULL;
char *tg_one;
if (strbuf_getline_lf(&buf, stdin) == EOF)
break;
tg_one = buf.buf;
rf_one = strchr(tg_one, '\t');
if (rf_one)
*rf_one++ = 0;
if (targets >= targets_alloc) {
targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
REALLOC_ARRAY(*target, targets_alloc);
REALLOC_ARRAY(*write_ref, targets_alloc);
}
(*target)[targets] = xstrdup(tg_one);
(*write_ref)[targets] = xstrdup_or_null(rf_one);
targets++;
}
strbuf_release(&buf);
return targets;
}
void walker_targets_free(int targets, char **target, const char **write_ref)
{
while (targets--) {
free(target[targets]);
if (write_ref)
free((char *) write_ref[targets]);
}
}
int walker_fetch(struct walker *walker, int targets, char **target,
const char **write_ref, const char *write_ref_log_details)
{
struct strbuf refname = STRBUF_INIT;
struct strbuf err = STRBUF_INIT;
struct ref_transaction *transaction = NULL;
struct object_id *oids;
char *msg = NULL;
int i, ret = -1;
save_commit_buffer = 0;
ALLOC_ARRAY(oids, targets);
if (write_ref) {
transaction = ref_transaction_begin(&err);
if (!transaction) {
error("%s", err.buf);
goto done;
}
}
if (!walker->get_recover) {
for_each_ref(mark_complete, NULL);
commit_list_sort_by_date(&complete);
}
for (i = 0; i < targets; i++) {
if (interpret_target(walker, target[i], oids + i)) {
error("Could not interpret response from server '%s' as something to pull", target[i]);
goto done;
}
if (process(walker, lookup_unknown_object(the_repository, &oids[i])))
goto done;
}
if (loop(walker))
goto done;
if (!write_ref) {
ret = 0;
goto done;
}
if (write_ref_log_details) {
msg = xstrfmt("fetch from %s", write_ref_log_details);
} else {
msg = NULL;
}
for (i = 0; i < targets; i++) {
if (!write_ref[i])
continue;
strbuf_reset(&refname);
strbuf_addf(&refname, "refs/%s", write_ref[i]);
if (ref_transaction_update(transaction, refname.buf,
oids + i, NULL, 0,
msg ? msg : "fetch (unknown)",
&err)) {
error("%s", err.buf);
goto done;
}
}
if (ref_transaction_commit(transaction, &err)) {
error("%s", err.buf);
goto done;
}
ret = 0;
done:
ref_transaction_free(transaction);
free(msg);
free(oids);
strbuf_release(&err);
strbuf_release(&refname);
return ret;
}
void walker_free(struct walker *walker)
{
walker->cleanup(walker);
free(walker);
}