Merge branch 'lt/tree-2'
[git/git.git] / fetch.c
diff --git a/fetch.c b/fetch.c
index af9a013..e040ef9 100644 (file)
--- a/fetch.c
+++ b/fetch.c
@@ -3,18 +3,19 @@
 #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;
-
-const unsigned char *current_ref = NULL;
+const char *write_ref_log_details = 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) 
@@ -33,32 +34,43 @@ static void report_missing(const char *what, const unsigned char *missing)
                what, missing_hex, sha1_to_hex(current_commit_sha1));
 }
 
-static int process(unsigned char *sha1, const char *type);
+static int process(struct object *obj);
 
 static int process_tree(struct tree *tree)
 {
-       struct tree_entry_list *entry;
+       struct tree_desc desc;
+       struct name_entry 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->sha1,
-                           entry->directory ? tree_type : blob_type))
+       desc.buf = tree->buffer;
+       desc.size = tree->size;
+       while (tree_entry(&desc, &entry)) {
+               struct object *obj = NULL;
+
+               if (S_ISDIR(entry.mode)) {
+                       struct tree *tree = lookup_tree(entry.sha1);
+                       if (tree)
+                               obj = &tree->object;
+               }
+               else {
+                       struct blob *blob = lookup_blob(entry.sha1);
+                       if (blob)
+                               obj = &blob->object;
+               }
+               if (!obj || process(obj))
                        return -1;
-               free(entry);
-               entry = next;
        }
+       free(tree->buffer);
+       tree->buffer = NULL;
+       tree->size = 0;
        return 0;
 }
 
-#define COMPLETE       1U
-#define TO_FETCH       2U
-#define TO_SCAN                4U
-#define SCANNED                8U
+#define COMPLETE       (1U << 0)
+#define SEEN           (1U << 1)
+#define TO_SCAN                (1U << 2)
 
 static struct commit_list *complete = NULL;
 
@@ -79,7 +91,7 @@ static int process_commit(struct commit *commit)
        pull_say("walk %s\n", sha1_to_hex(commit->object.sha1));
 
        if (get_tree) {
-               if (process(commit->tree->object.sha1, tree_type))
+               if (process(&commit->tree->object))
                        return -1;
                if (!get_all)
                        get_tree = 0;
@@ -87,7 +99,7 @@ static int process_commit(struct commit *commit)
        if (get_history) {
                struct commit_list *parents = commit->parents;
                for (; parents; parents = parents->next) {
-                       if (process(parents->item->object.sha1, commit_type))
+                       if (process(&parents->item->object))
                                return -1;
                }
        }
@@ -98,7 +110,7 @@ static int process_tag(struct tag *tag)
 {
        if (parse_tag(tag))
                return -1;
-       return process(tag->tagged->sha1, NULL);
+       return process(tag->tagged);
 }
 
 static struct object_list *process_queue = NULL;
@@ -106,10 +118,6 @@ static struct object_list **process_queue_end = &process_queue;
 
 static int process_object(struct object *obj)
 {
-       if (obj->flags & SCANNED)
-               return 0;
-       obj->flags |= SCANNED;
-
        if (obj->type == commit_type) {
                if (process_commit((struct commit *)obj))
                        return -1;
@@ -133,28 +141,23 @@ static int process_object(struct object *obj)
                     obj->type, sha1_to_hex(obj->sha1));
 }
 
-static int process(unsigned char *sha1, const char *type)
+static int process(struct object *obj)
 {
-       struct object *obj = lookup_object_type(sha1, type);
+       if (obj->flags & SEEN)
+               return 0;
+       obj->flags |= SEEN;
 
-       if (has_sha1_file(sha1)) {
-               parse_object(sha1);
+       if (has_sha1_file(obj->sha1)) {
                /* We already have it, so we should scan it now. */
-               if (obj->flags & (SCANNED | TO_SCAN))
-                       return 0;
-               object_list_insert(obj, process_queue_end);
-               process_queue_end = &(*process_queue_end)->next;
                obj->flags |= TO_SCAN;
-               return 0;
+       } else {
+               if (obj->flags & COMPLETE)
+                       return 0;
+               prefetch(obj->sha1);
        }
-       if (obj->flags & (COMPLETE | TO_FETCH))
-               return 0;
+               
        object_list_insert(obj, process_queue_end);
        process_queue_end = &(*process_queue_end)->next;
-       obj->flags |= TO_FETCH;
-
-       prefetch(sha1);
-               
        return 0;
 }
 
@@ -174,7 +177,7 @@ static int loop(void)
                 * the queue because we needed to fetch it first.
                 */
                if (! (obj->flags & TO_SCAN)) {
-                       if (!has_sha1_file(obj->sha1) && fetch(obj->sha1)) {
+                       if (fetch(obj->sha1)) {
                                report_missing(obj->type
                                               ? obj->type
                                               : "object", obj->sha1);
@@ -213,32 +216,51 @@ static int mark_complete(const char *path, const unsigned char *sha1)
 
 int pull(char *target)
 {
+       struct ref_lock *lock = NULL;
        unsigned char sha1[20];
-       int fd = -1;
+       char *msg;
+       int ret;
 
        save_commit_buffer = 0;
-       if (write_ref && current_ref) {
-               fd = lock_ref_sha1(write_ref, current_ref);
-               if (fd < 0)
+       track_object_refs = 0;
+       if (write_ref) {
+               lock = lock_ref_sha1(write_ref, NULL, 0);
+               if (!lock) {
+                       error("Can't lock ref %s", write_ref);
                        return -1;
+               }
        }
 
-       for_each_ref(mark_complete);
+       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(sha1, NULL))
+       if (interpret_target(target, sha1)) {
+               error("Could not interpret %s as something to pull", target);
+               if (lock)
+                       unlock_ref(lock);
                return -1;
-       if (loop())
+       }
+       if (process(lookup_unknown_object(sha1))) {
+               if (lock)
+                       unlock_ref(lock);
                return -1;
-       
+       }
+       if (loop()) {
+               if (lock)
+                       unlock_ref(lock);
+               return -1;
+       }
+
        if (write_ref) {
-               if (current_ref) {
-                       write_ref_sha1(write_ref, fd, sha1);
-               } else {
-                       write_ref_sha1_unlocked(write_ref, sha1);
-               }
+               if (write_ref_log_details) {
+                       msg = xmalloc(strlen(write_ref_log_details) + 12);
+                       sprintf(msg, "fetch from %s", write_ref_log_details);
+               } else
+                       msg = NULL;
+               ret = write_ref_sha1(lock, sha1, msg ? msg : "fetch (unknown)");
+               if (msg)
+                       free(msg);
+               return ret;
        }
        return 0;
 }