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#include "fetch.h"
#include "cache.h"
#include "commit.h"
#include "tree.h"
#include "tree-walk.h"
#include "tag.h"
#include "blob.h"
#include "refs.h"
const char *write_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_desc desc;
if (parse_tree(tree))
return -1;
desc.buf = tree->buffer;
desc.size = tree->size;
while (desc.size) {
unsigned mode;
const char *name;
const unsigned char *sha1;
sha1 = tree_entry_extract(&desc, &name, &mode);
update_tree_entry(&desc);
if (S_ISDIR(mode)) {
struct tree *tree = lookup_tree(sha1);
process_tree(tree);
} else {
struct blob *blob = lookup_blob(sha1);
process(&blob->object);
}
}
free(tree->buffer);
tree->buffer = NULL;
tree->size = 0;
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];
save_commit_buffer = 0;
track_object_refs = 0;
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)
write_ref_sha1_unlocked(write_ref, sha1);
return 0;
}
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