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