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-rw-r--r--fetch.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/fetch.c b/fetch.c
new file mode 100644
index 0000000..e874538
--- /dev/null
+++ b/fetch.c
@@ -0,0 +1,210 @@
+#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;
+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 make_sure_we_have_it(const char *what, unsigned char *sha1)
+{
+ int status = 0;
+
+ if (!has_sha1_file(sha1)) {
+ status = fetch(sha1);
+ if (status && what)
+ report_missing(what, sha1);
+ }
+ return status;
+}
+
+static int process(unsigned char *sha1, const char *type);
+
+static int process_tree(struct tree *tree)
+{
+ struct tree_entry_list *entries;
+
+ if (parse_tree(tree))
+ return -1;
+
+ for (entries = tree->entries; entries; entries = entries->next) {
+ if (process(entries->item.any->sha1,
+ entries->directory ? tree_type : blob_type))
+ return -1;
+ }
+ return 0;
+}
+
+static int process_commit(struct commit *commit)
+{
+ if (parse_commit(commit))
+ return -1;
+
+ memcpy(current_commit_sha1, commit->object.sha1, 20);
+
+ if (get_tree) {
+ if (process(commit->tree->object.sha1, tree_type))
+ return -1;
+ if (!get_all)
+ get_tree = 0;
+ }
+ if (get_history) {
+ struct commit_list *parents = commit->parents;
+ for (; parents; parents = parents->next) {
+ if (has_sha1_file(parents->item->object.sha1))
+ continue;
+ if (process(parents->item->object.sha1,
+ commit_type))
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int process_tag(struct tag *tag)
+{
+ if (parse_tag(tag))
+ return -1;
+ return process(tag->tagged->sha1, NULL);
+}
+
+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(unsigned char *sha1, const char *type)
+{
+ struct object *obj = lookup_object_type(sha1, type);
+ if (has_sha1_file(sha1)) {
+ parse_object(sha1);
+ /* We already have it, so we should scan it now. */
+ return process_object(obj);
+ }
+ if (object_list_contains(process_queue, obj))
+ return 0;
+ object_list_insert(obj, process_queue_end);
+ process_queue_end = &(*process_queue_end)->next;
+
+ //fprintf(stderr, "prefetch %s\n", sha1_to_hex(sha1));
+ prefetch(sha1);
+
+ return 0;
+}
+
+static int loop(void)
+{
+ while (process_queue) {
+ struct object *obj = process_queue->item;
+ /*
+ fprintf(stderr, "%d objects to pull\n",
+ object_list_length(process_queue));
+ */
+ process_queue = process_queue->next;
+ if (!process_queue)
+ process_queue_end = &process_queue;
+
+ //fprintf(stderr, "fetch %s\n", sha1_to_hex(obj->sha1));
+
+ if (make_sure_we_have_it(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;
+}
+
+
+int pull(char *target)
+{
+ unsigned char sha1[20];
+ int fd = -1;
+
+ if (write_ref && current_ref) {
+ fd = lock_ref_sha1(write_ref, current_ref);
+ if (fd < 0)
+ return -1;
+ }
+
+ if (interpret_target(target, sha1))
+ return error("Could not interpret %s as something to pull",
+ target);
+ if (process(sha1, NULL))
+ 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;
+}