From mboxrd@z Thu Jan 1 00:00:00 1970 From: Junio C Hamano Subject: [PATCH v3 13/19] apply: plug the three-way merge logic in Date: Wed, 13 Jun 2012 12:32:54 -0700 Message-ID: <1339615980-19727-14-git-send-email-gitster@pobox.com> References: <1339615980-19727-1-git-send-email-gitster@pobox.com> To: git@vger.kernel.org X-From: git-owner@vger.kernel.org Wed Jun 13 21:33:55 2012 Return-path: Envelope-to: gcvg-git-2@plane.gmane.org Received: from vger.kernel.org ([209.132.180.67]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1SetKE-00010Q-7S for gcvg-git-2@plane.gmane.org; Wed, 13 Jun 2012 21:33:54 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754793Ab2FMTdc (ORCPT ); Wed, 13 Jun 2012 15:33:32 -0400 Received: from b-pb-sasl-quonix.pobox.com ([208.72.237.35]:32798 "EHLO smtp.pobox.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754636Ab2FMTd2 (ORCPT ); Wed, 13 Jun 2012 15:33:28 -0400 Received: from smtp.pobox.com (unknown [127.0.0.1]) by b-sasl-quonix.pobox.com (Postfix) with ESMTP id A12BF872D for ; Wed, 13 Jun 2012 15:33:27 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=pobox.com; h=from:to :subject:date:message-id:in-reply-to:references; s=sasl; bh=togZ wz3UEl3vSu9fDZCYIZGlK3Y=; b=sEERA1ej05zhQF6ONG2d0/u8le+dcGwFT+j6 Oz+RDNXvJgRDEqZt1lpRfOt1czvu76zeAbI4OLlW0en/KkFBzRSdlC5uIvenRPmE vm+LTtwAnj44AFNDXqrEn+HwpwoD7GlUAuCrA6HEOtHfVgBPerPVAZbVDeT7km9d hCnPExw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=from:to:subject :date:message-id:in-reply-to:references; q=dns; s=sasl; b=goKZGq icLfl9dnPleqGLXFT1UN0V9dclpOIIXDs4gsOdUW4CWQqZg6fvmROX1w036Xeu/D U+Jlu4dkdab/eh75102UXWAIqFd2dtQO2g4OyT80dgDbSK25oB7syDTQB+ecpPNf sQOGI7pg+ZpqlRVUEpq4mlDF8JzXas0S1o2ZE= Received: from b-pb-sasl-quonix.pobox.com (unknown [127.0.0.1]) by b-sasl-quonix.pobox.com (Postfix) with ESMTP id 98C9A872A for ; Wed, 13 Jun 2012 15:33:27 -0400 (EDT) Received: from pobox.com (unknown [98.234.214.94]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by b-sasl-quonix.pobox.com (Postfix) with ESMTPSA id D9C2D8729 for ; Wed, 13 Jun 2012 15:33:26 -0400 (EDT) X-Mailer: git-send-email 1.7.11.rc3.30.g3bdace2 In-Reply-To: <1339615980-19727-1-git-send-email-gitster@pobox.com> X-Pobox-Relay-ID: A5C5EF32-B58E-11E1-8CC1-FC762E706CDE-77302942!b-pb-sasl-quonix.pobox.com Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: When a patch does not apply to what we have, but we know the preimage the patch was made against, we apply the patch to the preimage to compute what the patch author wanted the result to look like, and attempt a three-way merge between the result and our version, using the intended preimage as the base version. When we are applying the patch using the index, we would additionally need to add the object names of these three blobs involved in the merge, which is not yet done in this step, but we add a field to "struct patch" so that later write-out step can use it. Signed-off-by: Junio C Hamano --- builtin/apply.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 53 insertions(+), 6 deletions(-) diff --git a/builtin/apply.c b/builtin/apply.c index 6936588..5ef8652 100644 --- a/builtin/apply.c +++ b/builtin/apply.c @@ -16,6 +16,8 @@ #include "dir.h" #include "diff.h" #include "parse-options.h" +#include "xdiff-interface.h" +#include "ll-merge.h" /* * --check turns on checking that the working tree matches the @@ -194,12 +196,16 @@ struct patch { unsigned int is_copy:1; unsigned int is_rename:1; unsigned int recount:1; + unsigned int conflicted_threeway:1; struct fragment *fragments; char *result; size_t resultsize; char old_sha1_prefix[41]; char new_sha1_prefix[41]; struct patch *next; + + /* three-way fallback result */ + unsigned char threeway_stage[3][20]; }; static void free_fragment_list(struct fragment *list) @@ -3142,11 +3148,33 @@ static int load_preimage(struct image *image, static int three_way_merge(struct image *image, char *path, - unsigned char *base, - unsigned char *ours, - unsigned char *theirs) + const unsigned char *base, + const unsigned char *ours, + const unsigned char *theirs) { - return -1; /* for now */ + mmfile_t base_file, our_file, their_file; + mmbuffer_t result = { NULL }; + int status; + + read_mmblob(&base_file, base); + read_mmblob(&our_file, ours); + read_mmblob(&their_file, theirs); + status = ll_merge(&result, path, + &base_file, "base", + &our_file, "ours", + &their_file, "theirs", NULL); + free(base_file.ptr); + free(our_file.ptr); + free(their_file.ptr); + if (status < 0 || !result.ptr) { + free(result.ptr); + return -1; + } + clear_image(image); + image->buf = result.ptr; + image->len = result.size; + + return status; } static int try_threeway(struct image *image, struct patch *patch, @@ -3155,6 +3183,7 @@ static int try_threeway(struct image *image, struct patch *patch, unsigned char pre_sha1[20], post_sha1[20], our_sha1[20]; struct strbuf buf = STRBUF_INIT; size_t len; + int status; char *img; struct image tmp_image; @@ -3167,6 +3196,9 @@ static int try_threeway(struct image *image, struct patch *patch, if (get_sha1(patch->old_sha1_prefix, pre_sha1) || read_blob_object(&buf, pre_sha1, patch->old_mode)) return error("repository lacks the necessary blob to fall back on 3-way merge."); + + fprintf(stderr, "Falling back to three-way merge...\n"); + img = strbuf_detach(&buf, &len); prepare_image(&tmp_image, img, len, 1); /* Apply the patch to get the post image */ @@ -3186,8 +3218,23 @@ static int try_threeway(struct image *image, struct patch *patch, clear_image(&tmp_image); /* in-core three-way merge between post and our using pre as base */ - return three_way_merge(image, - patch->new_name, pre_sha1, our_sha1, post_sha1); + status = three_way_merge(image, patch->new_name, + pre_sha1, our_sha1, post_sha1); + if (status < 0) { + fprintf(stderr, "Failed to fall back on three-way merge...\n"); + return status; + } + + if (status) { + patch->conflicted_threeway = 1; + hashcpy(patch->threeway_stage[0], pre_sha1); + hashcpy(patch->threeway_stage[1], our_sha1); + hashcpy(patch->threeway_stage[2], post_sha1); + fprintf(stderr, "Applied patch to '%s' with conflicts.\n", patch->new_name); + } else { + fprintf(stderr, "Applied patch to '%s' cleanly.\n", patch->new_name); + } + return 0; } static int apply_data(struct patch *patch, struct stat *st, struct cache_entry *ce) -- 1.7.11.rc3.30.g3bdace2