mirror of
https://git.proxmox.com/git/libgit2
synced 2025-06-20 21:44:55 +00:00
efc2fec50e
It can be useful for the caller to know which update commands will be sent to the server before the packfile is pushed up. git does this via the pre-push hook. We don't have hooks, but as it adds introspection into what is happening, we can add a callback which performs the same function.
734 lines
16 KiB
C
734 lines
16 KiB
C
/*
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* Copyright (C) the libgit2 contributors. All rights reserved.
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*
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* This file is part of libgit2, distributed under the GNU GPL v2 with
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* a Linking Exception. For full terms see the included COPYING file.
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*/
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#include "git2.h"
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#include "common.h"
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#include "pack.h"
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#include "pack-objects.h"
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#include "remote.h"
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#include "vector.h"
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#include "push.h"
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#include "tree.h"
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static int push_spec_rref_cmp(const void *a, const void *b)
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{
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const push_spec *push_spec_a = a, *push_spec_b = b;
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return strcmp(push_spec_a->refspec.dst, push_spec_b->refspec.dst);
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}
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static int push_status_ref_cmp(const void *a, const void *b)
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{
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const push_status *push_status_a = a, *push_status_b = b;
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return strcmp(push_status_a->ref, push_status_b->ref);
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}
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int git_push_new(git_push **out, git_remote *remote)
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{
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git_push *p;
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*out = NULL;
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p = git__calloc(1, sizeof(*p));
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GITERR_CHECK_ALLOC(p);
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p->repo = remote->repo;
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p->remote = remote;
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p->report_status = 1;
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p->pb_parallelism = 1;
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if (git_vector_init(&p->specs, 0, push_spec_rref_cmp) < 0) {
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git__free(p);
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return -1;
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}
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if (git_vector_init(&p->status, 0, push_status_ref_cmp) < 0) {
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git_vector_free(&p->specs);
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git__free(p);
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return -1;
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}
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if (git_vector_init(&p->updates, 0, NULL) < 0) {
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git_vector_free(&p->status);
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git_vector_free(&p->specs);
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git__free(p);
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return -1;
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}
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*out = p;
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return 0;
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}
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int git_push_set_options(git_push *push, const git_push_options *opts)
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{
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if (!push || !opts)
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return -1;
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GITERR_CHECK_VERSION(opts, GIT_PUSH_OPTIONS_VERSION, "git_push_options");
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push->pb_parallelism = opts->pb_parallelism;
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return 0;
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}
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int git_push_set_callbacks(
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git_push *push,
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git_packbuilder_progress pack_progress_cb,
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void *pack_progress_cb_payload,
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git_push_transfer_progress transfer_progress_cb,
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void *transfer_progress_cb_payload,
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git_push_negotiation negotiation_cb,
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void *negotiation_cb_payload)
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{
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if (!push)
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return -1;
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push->pack_progress_cb = pack_progress_cb;
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push->pack_progress_cb_payload = pack_progress_cb_payload;
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push->transfer_progress_cb = transfer_progress_cb;
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push->transfer_progress_cb_payload = transfer_progress_cb_payload;
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push->negotiation_cb = negotiation_cb;
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push->negotiation_cb_payload = negotiation_cb_payload;
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return 0;
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}
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static void free_refspec(push_spec *spec)
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{
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if (spec == NULL)
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return;
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git_refspec__free(&spec->refspec);
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git__free(spec);
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}
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static int check_rref(char *ref)
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{
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if (git__prefixcmp(ref, "refs/")) {
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giterr_set(GITERR_INVALID, "Not a valid reference '%s'", ref);
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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 check_lref(git_push *push, char *ref)
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{
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/* lref must be resolvable to an existing object */
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git_object *obj;
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int error = git_revparse_single(&obj, push->repo, ref);
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git_object_free(obj);
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if (!error)
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return 0;
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if (error == GIT_ENOTFOUND)
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giterr_set(GITERR_REFERENCE,
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"src refspec '%s' does not match any existing object", ref);
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else
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giterr_set(GITERR_INVALID, "Not a valid reference '%s'", ref);
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return -1;
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}
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static int parse_refspec(git_push *push, push_spec **spec, const char *str)
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{
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push_spec *s;
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*spec = NULL;
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s = git__calloc(1, sizeof(*s));
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GITERR_CHECK_ALLOC(s);
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if (git_refspec__parse(&s->refspec, str, false) < 0) {
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giterr_set(GITERR_INVALID, "invalid refspec %s", str);
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goto on_error;
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}
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if (s->refspec.src && s->refspec.src[0] != '\0' &&
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check_lref(push, s->refspec.src) < 0) {
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goto on_error;
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}
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if (check_rref(s->refspec.dst) < 0)
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goto on_error;
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*spec = s;
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return 0;
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on_error:
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free_refspec(s);
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return -1;
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}
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int git_push_add_refspec(git_push *push, const char *refspec)
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{
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push_spec *spec;
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if (parse_refspec(push, &spec, refspec) < 0 ||
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git_vector_insert(&push->specs, spec) < 0)
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return -1;
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return 0;
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}
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int git_push_update_tips(git_push *push)
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{
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git_buf remote_ref_name = GIT_BUF_INIT;
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size_t i, j;
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git_refspec *fetch_spec;
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push_spec *push_spec = NULL;
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git_reference *remote_ref;
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push_status *status;
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int error = 0;
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git_vector_foreach(&push->status, i, status) {
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int fire_callback = 1;
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/* Skip unsuccessful updates which have non-empty messages */
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if (status->msg)
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continue;
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/* Find the corresponding remote ref */
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fetch_spec = git_remote__matching_refspec(push->remote, status->ref);
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if (!fetch_spec)
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continue;
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if ((error = git_refspec_transform(&remote_ref_name, fetch_spec, status->ref)) < 0)
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goto on_error;
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/* Find matching push ref spec */
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git_vector_foreach(&push->specs, j, push_spec) {
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if (!strcmp(push_spec->refspec.dst, status->ref))
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break;
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}
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/* Could not find the corresponding push ref spec for this push update */
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if (j == push->specs.length)
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continue;
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/* Update the remote ref */
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if (git_oid_iszero(&push_spec->loid)) {
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error = git_reference_lookup(&remote_ref, push->remote->repo, git_buf_cstr(&remote_ref_name));
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if (error >= 0) {
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error = git_reference_delete(remote_ref);
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git_reference_free(remote_ref);
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}
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} else {
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error = git_reference_create(NULL, push->remote->repo,
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git_buf_cstr(&remote_ref_name), &push_spec->loid, 1,
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"update by push");
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}
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if (error < 0) {
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if (error != GIT_ENOTFOUND)
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goto on_error;
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giterr_clear();
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fire_callback = 0;
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}
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if (fire_callback && push->remote->callbacks.update_tips) {
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error = push->remote->callbacks.update_tips(git_buf_cstr(&remote_ref_name),
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&push_spec->roid, &push_spec->loid, push->remote->callbacks.payload);
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if (error < 0)
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goto on_error;
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}
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}
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error = 0;
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on_error:
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git_buf_free(&remote_ref_name);
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return error;
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}
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/**
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* Insert all tags until we find a non-tag object, which is returned
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* in `out`.
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*/
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static int enqueue_tag(git_object **out, git_push *push, git_oid *id)
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{
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git_object *obj = NULL, *target = NULL;
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int error;
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if ((error = git_object_lookup(&obj, push->repo, id, GIT_OBJ_TAG)) < 0)
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return error;
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while (git_object_type(obj) == GIT_OBJ_TAG) {
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if ((error = git_packbuilder_insert(push->pb, git_object_id(obj), NULL)) < 0)
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break;
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if ((error = git_tag_target(&target, (git_tag *) obj)) < 0)
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break;
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git_object_free(obj);
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obj = target;
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}
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if (error < 0)
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git_object_free(obj);
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else
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*out = obj;
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return error;
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}
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static int revwalk(git_vector *commits, git_push *push)
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{
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git_remote_head *head;
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push_spec *spec;
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git_revwalk *rw;
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git_oid oid;
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unsigned int i;
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int error = -1;
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if (git_revwalk_new(&rw, push->repo) < 0)
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return -1;
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git_revwalk_sorting(rw, GIT_SORT_TIME);
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git_vector_foreach(&push->specs, i, spec) {
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git_otype type;
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size_t size;
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if (git_oid_iszero(&spec->loid))
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/*
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* Delete reference on remote side;
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* nothing to do here.
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*/
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continue;
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if (git_oid_equal(&spec->loid, &spec->roid))
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continue; /* up-to-date */
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if (git_odb_read_header(&size, &type, push->repo->_odb, &spec->loid) < 0)
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goto on_error;
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if (type == GIT_OBJ_TAG) {
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git_object *target;
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if ((error = enqueue_tag(&target, push, &spec->loid)) < 0)
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goto on_error;
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if (git_object_type(target) == GIT_OBJ_COMMIT) {
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if (git_revwalk_push(rw, git_object_id(target)) < 0) {
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git_object_free(target);
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goto on_error;
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}
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} else {
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if (git_packbuilder_insert(
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push->pb, git_object_id(target), NULL) < 0) {
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git_object_free(target);
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goto on_error;
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}
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}
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git_object_free(target);
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} else if (git_revwalk_push(rw, &spec->loid) < 0)
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goto on_error;
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if (!spec->refspec.force) {
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git_oid base;
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if (git_oid_iszero(&spec->roid))
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continue;
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if (!git_odb_exists(push->repo->_odb, &spec->roid)) {
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giterr_set(GITERR_REFERENCE,
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"Cannot push because a reference that you are trying to update on the remote contains commits that are not present locally.");
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error = GIT_ENONFASTFORWARD;
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goto on_error;
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}
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error = git_merge_base(&base, push->repo,
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&spec->loid, &spec->roid);
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if (error == GIT_ENOTFOUND ||
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(!error && !git_oid_equal(&base, &spec->roid))) {
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giterr_set(GITERR_REFERENCE,
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"Cannot push non-fastforwardable reference");
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error = GIT_ENONFASTFORWARD;
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goto on_error;
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}
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if (error < 0)
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goto on_error;
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}
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}
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git_vector_foreach(&push->remote->refs, i, head) {
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if (git_oid_iszero(&head->oid))
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continue;
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/* TODO */
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git_revwalk_hide(rw, &head->oid);
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}
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while ((error = git_revwalk_next(&oid, rw)) == 0) {
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git_oid *o = git__malloc(GIT_OID_RAWSZ);
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if (!o) {
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error = -1;
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goto on_error;
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}
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git_oid_cpy(o, &oid);
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if ((error = git_vector_insert(commits, o)) < 0)
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goto on_error;
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}
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on_error:
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git_revwalk_free(rw);
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return error == GIT_ITEROVER ? 0 : error;
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}
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static int enqueue_object(
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const git_tree_entry *entry,
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git_packbuilder *pb)
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{
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switch (git_tree_entry_type(entry)) {
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case GIT_OBJ_COMMIT:
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return 0;
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case GIT_OBJ_TREE:
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return git_packbuilder_insert_tree(pb, &entry->oid);
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default:
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return git_packbuilder_insert(pb, &entry->oid, entry->filename);
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}
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}
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static int queue_differences(
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git_tree *base,
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git_tree *delta,
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git_packbuilder *pb)
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{
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git_tree *b_child = NULL, *d_child = NULL;
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size_t b_length = git_tree_entrycount(base);
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size_t d_length = git_tree_entrycount(delta);
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size_t i = 0, j = 0;
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int error;
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while (i < b_length && j < d_length) {
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const git_tree_entry *b_entry = git_tree_entry_byindex(base, i);
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const git_tree_entry *d_entry = git_tree_entry_byindex(delta, j);
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int cmp = 0;
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if (!git_oid__cmp(&b_entry->oid, &d_entry->oid))
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goto loop;
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cmp = strcmp(b_entry->filename, d_entry->filename);
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|
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/* If the entries are both trees and they have the same name but are
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* different, then we'll recurse after adding the right-hand entry */
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if (!cmp &&
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git_tree_entry__is_tree(b_entry) &&
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git_tree_entry__is_tree(d_entry)) {
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/* Add the right-hand entry */
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if ((error = git_packbuilder_insert(pb, &d_entry->oid,
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d_entry->filename)) < 0)
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goto on_error;
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|
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/* Acquire the subtrees and recurse */
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if ((error = git_tree_lookup(&b_child,
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git_tree_owner(base), &b_entry->oid)) < 0 ||
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(error = git_tree_lookup(&d_child,
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git_tree_owner(delta), &d_entry->oid)) < 0 ||
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(error = queue_differences(b_child, d_child, pb)) < 0)
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goto on_error;
|
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git_tree_free(b_child); b_child = NULL;
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git_tree_free(d_child); d_child = NULL;
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}
|
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/* If the object is new or different in the right-hand tree,
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* then enumerate it */
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else if (cmp >= 0 &&
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(error = enqueue_object(d_entry, pb)) < 0)
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goto on_error;
|
|
|
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loop:
|
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if (cmp <= 0) i++;
|
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if (cmp >= 0) j++;
|
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}
|
|
|
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/* Drain the right-hand tree of entries */
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for (; j < d_length; j++)
|
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if ((error = enqueue_object(git_tree_entry_byindex(delta, j), pb)) < 0)
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goto on_error;
|
|
|
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error = 0;
|
|
|
|
on_error:
|
|
if (b_child)
|
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git_tree_free(b_child);
|
|
|
|
if (d_child)
|
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git_tree_free(d_child);
|
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|
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return error;
|
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}
|
|
|
|
static int queue_objects(git_push *push)
|
|
{
|
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git_vector commits = GIT_VECTOR_INIT;
|
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git_oid *oid;
|
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size_t i;
|
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unsigned j;
|
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int error;
|
|
|
|
if ((error = revwalk(&commits, push)) < 0)
|
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goto on_error;
|
|
|
|
git_vector_foreach(&commits, i, oid) {
|
|
git_commit *parent = NULL, *commit;
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git_tree *tree = NULL, *ptree = NULL;
|
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size_t parentcount;
|
|
|
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if ((error = git_commit_lookup(&commit, push->repo, oid)) < 0)
|
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goto on_error;
|
|
|
|
/* Insert the commit */
|
|
if ((error = git_packbuilder_insert(push->pb, oid, NULL)) < 0)
|
|
goto loop_error;
|
|
|
|
parentcount = git_commit_parentcount(commit);
|
|
|
|
if (!parentcount) {
|
|
if ((error = git_packbuilder_insert_tree(push->pb,
|
|
git_commit_tree_id(commit))) < 0)
|
|
goto loop_error;
|
|
} else {
|
|
if ((error = git_tree_lookup(&tree, push->repo,
|
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git_commit_tree_id(commit))) < 0 ||
|
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(error = git_packbuilder_insert(push->pb,
|
|
git_commit_tree_id(commit), NULL)) < 0)
|
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goto loop_error;
|
|
|
|
/* For each parent, add the items which are different */
|
|
for (j = 0; j < parentcount; j++) {
|
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if ((error = git_commit_parent(&parent, commit, j)) < 0 ||
|
|
(error = git_commit_tree(&ptree, parent)) < 0 ||
|
|
(error = queue_differences(ptree, tree, push->pb)) < 0)
|
|
goto loop_error;
|
|
|
|
git_tree_free(ptree); ptree = NULL;
|
|
git_commit_free(parent); parent = NULL;
|
|
}
|
|
}
|
|
|
|
error = 0;
|
|
|
|
loop_error:
|
|
if (tree)
|
|
git_tree_free(tree);
|
|
|
|
if (ptree)
|
|
git_tree_free(ptree);
|
|
|
|
if (parent)
|
|
git_commit_free(parent);
|
|
|
|
git_commit_free(commit);
|
|
|
|
if (error < 0)
|
|
goto on_error;
|
|
}
|
|
|
|
error = 0;
|
|
|
|
on_error:
|
|
git_vector_free_deep(&commits);
|
|
return error;
|
|
}
|
|
|
|
static int add_update(git_push *push, push_spec *spec)
|
|
{
|
|
git_push_update *u = git__calloc(1, sizeof(git_push_update));
|
|
GITERR_CHECK_ALLOC(u);
|
|
|
|
u->src_refname = git__strdup(spec->refspec.src);
|
|
GITERR_CHECK_ALLOC(u->src_refname);
|
|
u->dst_refname = git__strdup(spec->refspec.src);
|
|
GITERR_CHECK_ALLOC(u->dst_refname);
|
|
|
|
git_oid_cpy(&u->src, &spec->loid);
|
|
git_oid_cpy(&u->dst, &spec->roid);
|
|
|
|
return git_vector_insert(&push->updates, u);
|
|
}
|
|
|
|
static int calculate_work(git_push *push)
|
|
{
|
|
git_remote_head *head;
|
|
push_spec *spec;
|
|
unsigned int i, j;
|
|
|
|
/* Update local and remote oids*/
|
|
|
|
git_vector_foreach(&push->specs, i, spec) {
|
|
if (spec->refspec.src && spec->refspec.src[0]!= '\0') {
|
|
/* This is a create or update. Local ref must exist. */
|
|
if (git_reference_name_to_id(
|
|
&spec->loid, push->repo, spec->refspec.src) < 0) {
|
|
giterr_set(GITERR_REFERENCE, "No such reference '%s'", spec->refspec.src);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Remote ref may or may not (e.g. during create) already exist. */
|
|
git_vector_foreach(&push->remote->refs, j, head) {
|
|
if (!strcmp(spec->refspec.dst, head->name)) {
|
|
git_oid_cpy(&spec->roid, &head->oid);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (add_update(push, spec) < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int do_push(git_push *push)
|
|
{
|
|
int error = 0;
|
|
git_transport *transport = push->remote->transport;
|
|
|
|
if (!transport->push) {
|
|
giterr_set(GITERR_NET, "Remote transport doesn't support push");
|
|
error = -1;
|
|
goto on_error;
|
|
}
|
|
|
|
/*
|
|
* A pack-file MUST be sent if either create or update command
|
|
* is used, even if the server already has all the necessary
|
|
* objects. In this case the client MUST send an empty pack-file.
|
|
*/
|
|
|
|
if ((error = git_packbuilder_new(&push->pb, push->repo)) < 0)
|
|
goto on_error;
|
|
|
|
git_packbuilder_set_threads(push->pb, push->pb_parallelism);
|
|
|
|
if (push->pack_progress_cb)
|
|
if ((error = git_packbuilder_set_callbacks(push->pb, push->pack_progress_cb, push->pack_progress_cb_payload)) < 0)
|
|
goto on_error;
|
|
|
|
if ((error = calculate_work(push)) < 0)
|
|
goto on_error;
|
|
|
|
if (push->negotiation_cb &&
|
|
(error = push->negotiation_cb((const git_push_update **) push->updates.contents,
|
|
push->updates.length,
|
|
push->negotiation_cb_payload)))
|
|
goto on_error;
|
|
|
|
if ((error = queue_objects(push)) < 0 ||
|
|
(error = transport->push(transport, push)) < 0)
|
|
goto on_error;
|
|
|
|
on_error:
|
|
git_packbuilder_free(push->pb);
|
|
return error;
|
|
}
|
|
|
|
static int filter_refs(git_remote *remote)
|
|
{
|
|
const git_remote_head **heads;
|
|
size_t heads_len, i;
|
|
|
|
git_vector_clear(&remote->refs);
|
|
|
|
if (git_remote_ls(&heads, &heads_len, remote) < 0)
|
|
return -1;
|
|
|
|
for (i = 0; i < heads_len; i++) {
|
|
if (git_vector_insert(&remote->refs, (void *)heads[i]) < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int git_push_finish(git_push *push)
|
|
{
|
|
int error;
|
|
|
|
if (!git_remote_connected(push->remote) &&
|
|
(error = git_remote_connect(push->remote, GIT_DIRECTION_PUSH)) < 0)
|
|
return error;
|
|
|
|
if ((error = filter_refs(push->remote)) < 0 ||
|
|
(error = do_push(push)) < 0)
|
|
return error;
|
|
|
|
if (!push->unpack_ok) {
|
|
error = -1;
|
|
giterr_set(GITERR_NET, "unpacking the sent packfile failed on the remote");
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
int git_push_status_foreach(git_push *push,
|
|
int (*cb)(const char *ref, const char *msg, void *data),
|
|
void *data)
|
|
{
|
|
push_status *status;
|
|
unsigned int i;
|
|
|
|
git_vector_foreach(&push->status, i, status) {
|
|
int error = cb(status->ref, status->msg, data);
|
|
if (error)
|
|
return giterr_set_after_callback(error);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void git_push_status_free(push_status *status)
|
|
{
|
|
if (status == NULL)
|
|
return;
|
|
|
|
git__free(status->msg);
|
|
git__free(status->ref);
|
|
git__free(status);
|
|
}
|
|
|
|
void git_push_free(git_push *push)
|
|
{
|
|
push_spec *spec;
|
|
push_status *status;
|
|
unsigned int i;
|
|
|
|
if (push == NULL)
|
|
return;
|
|
|
|
git_vector_foreach(&push->specs, i, spec) {
|
|
free_refspec(spec);
|
|
}
|
|
git_vector_free(&push->specs);
|
|
|
|
git_vector_foreach(&push->status, i, status) {
|
|
git_push_status_free(status);
|
|
}
|
|
git_vector_free(&push->status);
|
|
|
|
git__free(push);
|
|
}
|
|
|
|
int git_push_init_options(git_push_options *opts, unsigned int version)
|
|
{
|
|
GIT_INIT_STRUCTURE_FROM_TEMPLATE(
|
|
opts, version, git_push_options, GIT_PUSH_OPTIONS_INIT);
|
|
return 0;
|
|
}
|