git/fetch.c
Nick Hengeveld 11f0dafe2b [PATCH] Don't fetch objects that exist in the local repository
Be sure not to fetch objects that already exist in the local repository.
The main process loop no longer performs this check, http-fetch now checks
prior to starting a new request queue entry and when fetch_object() is called,
and local-fetch now checks when fetch_object() is called.

As discussed in this thread: http://marc.theaimsgroup.com/?t=112854890500001

Signed-off-by: Nick Hengeveld <nickh@reactrix.com>
2005-10-10 23:22:01 -07:00

239 lines
4.7 KiB
C

#include "fetch.h"
#include "cache.h"
#include "commit.h"
#include "tree.h"
#include "tag.h"
#include "blob.h"
#include "refs.h"
const char *write_ref = NULL;
const unsigned char *current_ref = NULL;
int get_tree = 0;
int get_history = 0;
int get_all = 0;
int get_verbosely = 0;
int get_recover = 0;
static unsigned char current_commit_sha1[20];
void pull_say(const char *fmt, const char *hex)
{
if (get_verbosely)
fprintf(stderr, fmt, hex);
}
static void report_missing(const char *what, const unsigned char *missing)
{
char missing_hex[41];
strcpy(missing_hex, sha1_to_hex(missing));;
fprintf(stderr,
"Cannot obtain needed %s %s\nwhile processing commit %s.\n",
what, missing_hex, sha1_to_hex(current_commit_sha1));
}
static int process(struct object *obj);
static int process_tree(struct tree *tree)
{
struct tree_entry_list *entry;
if (parse_tree(tree))
return -1;
entry = tree->entries;
tree->entries = NULL;
while (entry) {
struct tree_entry_list *next = entry->next;
if (process(entry->item.any))
return -1;
free(entry->name);
free(entry);
entry = next;
}
return 0;
}
#define COMPLETE (1U << 0)
#define SEEN (1U << 1)
#define TO_SCAN (1U << 2)
static struct commit_list *complete = NULL;
static int process_commit(struct commit *commit)
{
if (parse_commit(commit))
return -1;
while (complete && complete->item->date >= commit->date) {
pop_most_recent_commit(&complete, COMPLETE);
}
if (commit->object.flags & COMPLETE)
return 0;
memcpy(current_commit_sha1, commit->object.sha1, 20);
pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
if (get_tree) {
if (process(&commit->tree->object))
return -1;
if (!get_all)
get_tree = 0;
}
if (get_history) {
struct commit_list *parents = commit->parents;
for (; parents; parents = parents->next) {
if (process(&parents->item->object))
return -1;
}
}
return 0;
}
static int process_tag(struct tag *tag)
{
if (parse_tag(tag))
return -1;
return process(tag->tagged);
}
static struct object_list *process_queue = NULL;
static struct object_list **process_queue_end = &process_queue;
static int process_object(struct object *obj)
{
if (obj->type == commit_type) {
if (process_commit((struct commit *)obj))
return -1;
return 0;
}
if (obj->type == tree_type) {
if (process_tree((struct tree *)obj))
return -1;
return 0;
}
if (obj->type == blob_type) {
return 0;
}
if (obj->type == tag_type) {
if (process_tag((struct tag *)obj))
return -1;
return 0;
}
return error("Unable to determine requirements "
"of type %s for %s",
obj->type, sha1_to_hex(obj->sha1));
}
static int process(struct object *obj)
{
if (obj->flags & SEEN)
return 0;
obj->flags |= SEEN;
if (has_sha1_file(obj->sha1)) {
/* We already have it, so we should scan it now. */
obj->flags |= TO_SCAN;
} else {
if (obj->flags & COMPLETE)
return 0;
prefetch(obj->sha1);
}
object_list_insert(obj, process_queue_end);
process_queue_end = &(*process_queue_end)->next;
return 0;
}
static int loop(void)
{
struct object_list *elem;
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 (fetch(obj->sha1)) {
report_missing(obj->type
? obj->type
: "object", obj->sha1);
return -1;
}
}
if (!obj->type)
parse_object(obj->sha1);
if (process_object(obj))
return -1;
}
return 0;
}
static int interpret_target(char *target, unsigned char *sha1)
{
if (!get_sha1_hex(target, sha1))
return 0;
if (!check_ref_format(target)) {
if (!fetch_ref(target, sha1)) {
return 0;
}
}
return -1;
}
static int mark_complete(const char *path, const unsigned char *sha1)
{
struct commit *commit = lookup_commit_reference_gently(sha1, 1);
if (commit) {
commit->object.flags |= COMPLETE;
insert_by_date(commit, &complete);
}
return 0;
}
int pull(char *target)
{
unsigned char sha1[20];
int fd = -1;
save_commit_buffer = 0;
track_object_refs = 0;
if (write_ref && current_ref) {
fd = lock_ref_sha1(write_ref, current_ref);
if (fd < 0)
return -1;
}
if (!get_recover) {
for_each_ref(mark_complete);
}
if (interpret_target(target, sha1))
return error("Could not interpret %s as something to pull",
target);
if (process(lookup_unknown_object(sha1)))
return -1;
if (loop())
return -1;
if (write_ref) {
if (current_ref) {
write_ref_sha1(write_ref, fd, sha1);
} else {
write_ref_sha1_unlocked(write_ref, sha1);
}
}
return 0;
}