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git/walker.c
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#include "cache.h" | |
#include "walker.h" | |
#include "commit.h" | |
#include "tree.h" | |
#include "tree-walk.h" | |
#include "tag.h" | |
#include "blob.h" | |
#include "refs.h" | |
static unsigned char current_commit_sha1[20]; | |
void walker_say(struct walker *walker, const char *fmt, const char *hex) | |
{ | |
if (walker->get_verbosely) | |
fprintf(stderr, fmt, hex); | |
} | |
static void report_missing(const struct object *obj) | |
{ | |
fprintf(stderr, "Cannot obtain needed %s %s\n", | |
obj->type ? typename(obj->type): "object", | |
oid_to_hex(&obj->oid)); | |
if (!is_null_sha1(current_commit_sha1)) | |
fprintf(stderr, "while processing commit %s.\n", | |
sha1_to_hex(current_commit_sha1)); | |
} | |
static int process(struct walker *walker, struct object *obj); | |
static int process_tree(struct walker *walker, struct tree *tree) | |
{ | |
struct tree_desc desc; | |
struct name_entry entry; | |
if (parse_tree(tree)) | |
return -1; | |
init_tree_desc(&desc, tree->buffer, tree->size); | |
while (tree_entry(&desc, &entry)) { | |
struct object *obj = NULL; | |
/* submodule commits are not stored in the superproject */ | |
if (S_ISGITLINK(entry.mode)) | |
continue; | |
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(walker, obj)) | |
return -1; | |
} | |
free_tree_buffer(tree); | |
return 0; | |
} | |
/* Remember to update object flag allocation in object.h */ | |
#define COMPLETE (1U << 0) | |
#define SEEN (1U << 1) | |
#define TO_SCAN (1U << 2) | |
static struct commit_list *complete = NULL; | |
static int process_commit(struct walker *walker, 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; | |
hashcpy(current_commit_sha1, commit->object.oid.hash); | |
walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid)); | |
if (walker->get_tree) { | |
if (process(walker, &commit->tree->object)) | |
return -1; | |
if (!walker->get_all) | |
walker->get_tree = 0; | |
} | |
if (walker->get_history) { | |
struct commit_list *parents = commit->parents; | |
for (; parents; parents = parents->next) { | |
if (process(walker, &parents->item->object)) | |
return -1; | |
} | |
} | |
return 0; | |
} | |
static int process_tag(struct walker *walker, struct tag *tag) | |
{ | |
if (parse_tag(tag)) | |
return -1; | |
return process(walker, tag->tagged); | |
} | |
static struct object_list *process_queue = NULL; | |
static struct object_list **process_queue_end = &process_queue; | |
static int process_object(struct walker *walker, struct object *obj) | |
{ | |
if (obj->type == OBJ_COMMIT) { | |
if (process_commit(walker, (struct commit *)obj)) | |
return -1; | |
return 0; | |
} | |
if (obj->type == OBJ_TREE) { | |
if (process_tree(walker, (struct tree *)obj)) | |
return -1; | |
return 0; | |
} | |
if (obj->type == OBJ_BLOB) { | |
return 0; | |
} | |
if (obj->type == OBJ_TAG) { | |
if (process_tag(walker, (struct tag *)obj)) | |
return -1; | |
return 0; | |
} | |
return error("Unable to determine requirements " | |
"of type %s for %s", | |
typename(obj->type), oid_to_hex(&obj->oid)); | |
} | |
static int process(struct walker *walker, struct object *obj) | |
{ | |
if (obj->flags & SEEN) | |
return 0; | |
obj->flags |= SEEN; | |
if (has_object_file(&obj->oid)) { | |
/* We already have it, so we should scan it now. */ | |
obj->flags |= TO_SCAN; | |
} | |
else { | |
if (obj->flags & COMPLETE) | |
return 0; | |
walker->prefetch(walker, obj->oid.hash); | |
} | |
object_list_insert(obj, process_queue_end); | |
process_queue_end = &(*process_queue_end)->next; | |
return 0; | |
} | |
static int loop(struct walker *walker) | |
{ | |
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 (walker->fetch(walker, obj->oid.hash)) { | |
report_missing(obj); | |
return -1; | |
} | |
} | |
if (!obj->type) | |
parse_object(obj->oid.hash); | |
if (process_object(walker, obj)) | |
return -1; | |
} | |
return 0; | |
} | |
static int interpret_target(struct walker *walker, char *target, unsigned char *sha1) | |
{ | |
if (!get_sha1_hex(target, sha1)) | |
return 0; | |
if (!check_refname_format(target, 0)) { | |
struct ref *ref = alloc_ref(target); | |
if (!walker->fetch_ref(walker, ref)) { | |
hashcpy(sha1, ref->old_oid.hash); | |
free(ref); | |
return 0; | |
} | |
free(ref); | |
} | |
return -1; | |
} | |
static int mark_complete(const char *path, const struct object_id *oid, | |
int flag, void *cb_data) | |
{ | |
struct commit *commit = lookup_commit_reference_gently(oid->hash, 1); | |
if (commit) { | |
commit->object.flags |= COMPLETE; | |
commit_list_insert(commit, &complete); | |
} | |
return 0; | |
} | |
int walker_targets_stdin(char ***target, const char ***write_ref) | |
{ | |
int targets = 0, targets_alloc = 0; | |
struct strbuf buf = STRBUF_INIT; | |
*target = NULL; *write_ref = NULL; | |
while (1) { | |
char *rf_one = NULL; | |
char *tg_one; | |
if (strbuf_getline_lf(&buf, stdin) == EOF) | |
break; | |
tg_one = buf.buf; | |
rf_one = strchr(tg_one, '\t'); | |
if (rf_one) | |
*rf_one++ = 0; | |
if (targets >= targets_alloc) { | |
targets_alloc = targets_alloc ? targets_alloc * 2 : 64; | |
REALLOC_ARRAY(*target, targets_alloc); | |
REALLOC_ARRAY(*write_ref, targets_alloc); | |
} | |
(*target)[targets] = xstrdup(tg_one); | |
(*write_ref)[targets] = xstrdup_or_null(rf_one); | |
targets++; | |
} | |
strbuf_release(&buf); | |
return targets; | |
} | |
void walker_targets_free(int targets, char **target, const char **write_ref) | |
{ | |
while (targets--) { | |
free(target[targets]); | |
if (write_ref) | |
free((char *) write_ref[targets]); | |
} | |
} | |
int walker_fetch(struct walker *walker, int targets, char **target, | |
const char **write_ref, const char *write_ref_log_details) | |
{ | |
struct strbuf refname = STRBUF_INIT; | |
struct strbuf err = STRBUF_INIT; | |
struct ref_transaction *transaction = NULL; | |
unsigned char *sha1 = xmalloc(targets * 20); | |
char *msg = NULL; | |
int i, ret = -1; | |
save_commit_buffer = 0; | |
if (write_ref) { | |
transaction = ref_transaction_begin(&err); | |
if (!transaction) { | |
error("%s", err.buf); | |
goto done; | |
} | |
} | |
if (!walker->get_recover) { | |
for_each_ref(mark_complete, NULL); | |
commit_list_sort_by_date(&complete); | |
} | |
for (i = 0; i < targets; i++) { | |
if (interpret_target(walker, target[i], &sha1[20 * i])) { | |
error("Could not interpret response from server '%s' as something to pull", target[i]); | |
goto done; | |
} | |
if (process(walker, lookup_unknown_object(&sha1[20 * i]))) | |
goto done; | |
} | |
if (loop(walker)) | |
goto done; | |
if (!write_ref) { | |
ret = 0; | |
goto done; | |
} | |
if (write_ref_log_details) { | |
msg = xstrfmt("fetch from %s", write_ref_log_details); | |
} else { | |
msg = NULL; | |
} | |
for (i = 0; i < targets; i++) { | |
if (!write_ref[i]) | |
continue; | |
strbuf_reset(&refname); | |
strbuf_addf(&refname, "refs/%s", write_ref[i]); | |
if (ref_transaction_update(transaction, refname.buf, | |
&sha1[20 * i], NULL, 0, | |
msg ? msg : "fetch (unknown)", | |
&err)) { | |
error("%s", err.buf); | |
goto done; | |
} | |
} | |
if (ref_transaction_commit(transaction, &err)) { | |
error("%s", err.buf); | |
goto done; | |
} | |
ret = 0; | |
done: | |
ref_transaction_free(transaction); | |
free(msg); | |
free(sha1); | |
strbuf_release(&err); | |
strbuf_release(&refname); | |
return ret; | |
} | |
void walker_free(struct walker *walker) | |
{ | |
walker->cleanup(walker); | |
free(walker); | |
} |