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https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Jeff King](/assets/img/avatar_default.png)
We take a printf-style format and a single "char *" parameter, and the format must therefore have at most one "%s" in it. Besides being error-prone (and tickling -Wformat-nonliteral), this is unnecessarily restrictive. We can just provide the usual varargs interface. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
335 lines
7.4 KiB
C
335 lines
7.4 KiB
C
#include "cache.h"
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#include "walker.h"
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#include "commit.h"
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#include "tree.h"
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#include "tree-walk.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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static unsigned char current_commit_sha1[20];
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void walker_say(struct walker *walker, const char *fmt, ...)
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{
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if (walker->get_verbosely) {
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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}
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}
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static void report_missing(const struct object *obj)
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{
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fprintf(stderr, "Cannot obtain needed %s %s\n",
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obj->type ? typename(obj->type): "object",
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oid_to_hex(&obj->oid));
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if (!is_null_sha1(current_commit_sha1))
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fprintf(stderr, "while processing commit %s.\n",
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sha1_to_hex(current_commit_sha1));
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}
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static int process(struct walker *walker, struct object *obj);
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static int process_tree(struct walker *walker, struct tree *tree)
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{
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struct tree_desc desc;
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struct name_entry entry;
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if (parse_tree(tree))
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return -1;
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init_tree_desc(&desc, tree->buffer, tree->size);
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while (tree_entry(&desc, &entry)) {
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struct object *obj = NULL;
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/* submodule commits are not stored in the superproject */
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if (S_ISGITLINK(entry.mode))
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continue;
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if (S_ISDIR(entry.mode)) {
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struct tree *tree = lookup_tree(entry.oid->hash);
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if (tree)
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obj = &tree->object;
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}
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else {
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struct blob *blob = lookup_blob(entry.oid->hash);
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if (blob)
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obj = &blob->object;
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}
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if (!obj || process(walker, obj))
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return -1;
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}
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free_tree_buffer(tree);
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return 0;
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}
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/* Remember to update object flag allocation in object.h */
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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 walker *walker, 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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hashcpy(current_commit_sha1, commit->object.oid.hash);
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walker_say(walker, "walk %s\n", oid_to_hex(&commit->object.oid));
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if (walker->get_tree) {
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if (process(walker, &commit->tree->object))
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return -1;
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if (!walker->get_all)
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walker->get_tree = 0;
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}
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if (walker->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(walker, &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 walker *walker, 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(walker, 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 walker *walker, struct object *obj)
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{
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if (obj->type == OBJ_COMMIT) {
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if (process_commit(walker, (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 == OBJ_TREE) {
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if (process_tree(walker, (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 == OBJ_BLOB) {
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return 0;
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}
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if (obj->type == OBJ_TAG) {
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if (process_tag(walker, (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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typename(obj->type), oid_to_hex(&obj->oid));
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}
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static int process(struct walker *walker, 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_object_file(&obj->oid)) {
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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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}
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else {
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if (obj->flags & COMPLETE)
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return 0;
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walker->prefetch(walker, obj->oid.hash);
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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(struct walker *walker)
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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 (walker->fetch(walker, obj->oid.hash)) {
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report_missing(obj);
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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->oid.hash);
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if (process_object(walker, 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(struct walker *walker, 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_refname_format(target, 0)) {
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struct ref *ref = alloc_ref(target);
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if (!walker->fetch_ref(walker, ref)) {
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hashcpy(sha1, ref->old_oid.hash);
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free(ref);
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return 0;
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}
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free(ref);
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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 struct object_id *oid,
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int flag, void *cb_data)
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{
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struct commit *commit = lookup_commit_reference_gently(oid->hash, 1);
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if (commit) {
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commit->object.flags |= COMPLETE;
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commit_list_insert(commit, &complete);
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}
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return 0;
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}
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int walker_targets_stdin(char ***target, const char ***write_ref)
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{
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int targets = 0, targets_alloc = 0;
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struct strbuf buf = STRBUF_INIT;
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*target = NULL; *write_ref = NULL;
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while (1) {
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char *rf_one = NULL;
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char *tg_one;
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if (strbuf_getline_lf(&buf, stdin) == EOF)
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break;
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tg_one = buf.buf;
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rf_one = strchr(tg_one, '\t');
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if (rf_one)
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*rf_one++ = 0;
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if (targets >= targets_alloc) {
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targets_alloc = targets_alloc ? targets_alloc * 2 : 64;
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REALLOC_ARRAY(*target, targets_alloc);
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REALLOC_ARRAY(*write_ref, targets_alloc);
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}
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(*target)[targets] = xstrdup(tg_one);
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(*write_ref)[targets] = xstrdup_or_null(rf_one);
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targets++;
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}
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strbuf_release(&buf);
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return targets;
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}
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void walker_targets_free(int targets, char **target, const char **write_ref)
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{
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while (targets--) {
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free(target[targets]);
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if (write_ref)
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free((char *) write_ref[targets]);
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}
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}
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int walker_fetch(struct walker *walker, int targets, char **target,
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const char **write_ref, const char *write_ref_log_details)
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{
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struct strbuf refname = STRBUF_INIT;
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struct strbuf err = STRBUF_INIT;
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struct ref_transaction *transaction = NULL;
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unsigned char *sha1 = xmalloc(targets * 20);
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char *msg = NULL;
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int i, ret = -1;
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save_commit_buffer = 0;
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if (write_ref) {
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transaction = ref_transaction_begin(&err);
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if (!transaction) {
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error("%s", err.buf);
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goto done;
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}
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}
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if (!walker->get_recover) {
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for_each_ref(mark_complete, NULL);
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commit_list_sort_by_date(&complete);
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}
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for (i = 0; i < targets; i++) {
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if (interpret_target(walker, target[i], &sha1[20 * i])) {
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error("Could not interpret response from server '%s' as something to pull", target[i]);
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goto done;
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}
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if (process(walker, lookup_unknown_object(&sha1[20 * i])))
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goto done;
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}
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if (loop(walker))
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goto done;
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if (!write_ref) {
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ret = 0;
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goto done;
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}
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if (write_ref_log_details) {
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msg = xstrfmt("fetch from %s", write_ref_log_details);
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} else {
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msg = NULL;
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}
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for (i = 0; i < targets; i++) {
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if (!write_ref[i])
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continue;
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strbuf_reset(&refname);
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strbuf_addf(&refname, "refs/%s", write_ref[i]);
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if (ref_transaction_update(transaction, refname.buf,
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&sha1[20 * i], NULL, 0,
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msg ? msg : "fetch (unknown)",
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&err)) {
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error("%s", err.buf);
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goto done;
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}
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}
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if (ref_transaction_commit(transaction, &err)) {
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error("%s", err.buf);
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goto done;
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}
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ret = 0;
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done:
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ref_transaction_free(transaction);
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free(msg);
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free(sha1);
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strbuf_release(&err);
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strbuf_release(&refname);
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return ret;
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}
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void walker_free(struct walker *walker)
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{
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walker->cleanup(walker);
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free(walker);
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}
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