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[86.199.91.216]) by smtp.googlemail.com with ESMTPSA id y16sm31563409wro.71.2020.06.25.05.48.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Jun 2020 05:48:59 -0700 (PDT) From: Alban Gruin To: git@vger.kernel.org Cc: Junio C Hamano , Alban Gruin Subject: [RFC PATCH v1 05/17] merge-one-file: libify merge_one_file() Date: Thu, 25 Jun 2020 14:19:41 +0200 Message-Id: <20200625121953.16991-6-alban.gruin@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200625121953.16991-1-alban.gruin@gmail.com> References: <20200625121953.16991-1-alban.gruin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org This moves merge_one_file() (and its helper functions) to a new file, merge-strategies.c. This will enable the resolve and octopus strategies to directly call it instead of forking. It is also renamed merge_strategies_one_file(). This is not a faithful copy-and-paste; in the builtin versions, merge_one_file() operated on `the_repository' and `the_index', something we cannot allow a function part of libgit.a to do. Hence, it now takes a pointer to a repository as its first argument (and helper functions takes a pointer to an `index_state'). Signed-off-by: Alban Gruin --- Notes: This patch is best viewed with `--color-moved'. Makefile | 1 + builtin/merge-one-file.c | 190 +------------------------------------- merge-strategies.c | 191 +++++++++++++++++++++++++++++++++++++++ merge-strategies.h | 13 +++ 4 files changed, 209 insertions(+), 186 deletions(-) create mode 100644 merge-strategies.c create mode 100644 merge-strategies.h diff --git a/Makefile b/Makefile index 19574f5133..1ab4d160cb 100644 --- a/Makefile +++ b/Makefile @@ -911,6 +911,7 @@ LIB_OBJS += match-trees.o LIB_OBJS += mem-pool.o LIB_OBJS += merge-blobs.o LIB_OBJS += merge-recursive.o +LIB_OBJS += merge-strategies.o LIB_OBJS += merge.o LIB_OBJS += mergesort.o LIB_OBJS += midx.o diff --git a/builtin/merge-one-file.c b/builtin/merge-one-file.c index d612885723..2f7a3e1db2 100644 --- a/builtin/merge-one-file.c +++ b/builtin/merge-one-file.c @@ -23,191 +23,8 @@ #define USE_THE_INDEX_COMPATIBILITY_MACROS #include "cache.h" #include "builtin.h" -#include "commit.h" -#include "dir.h" #include "lockfile.h" -#include "object-store.h" -#include "xdiff-interface.h" - -static int add_to_index_cacheinfo(unsigned int mode, - const struct object_id *oid, const char *path) -{ - struct cache_entry *ce; - int len, option; - - if (!verify_path(path, mode)) - return error("Invalid path '%s'", path); - - len = strlen(path); - ce = make_empty_cache_entry(&the_index, len); - - oidcpy(&ce->oid, oid); - memcpy(ce->name, path, len); - ce->ce_flags = create_ce_flags(0); - ce->ce_namelen = len; - ce->ce_mode = create_ce_mode(mode); - if (assume_unchanged) - ce->ce_flags |= CE_VALID; - option = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE; - if (add_cache_entry(ce, option)) - return error("%s: cannot add to the index", path); - - return 0; -} - -static int checkout_from_index(const char *path) -{ - struct checkout state; - struct cache_entry *ce; - - state.istate = &the_index; - state.force = 1; - state.base_dir = ""; - state.base_dir_len = 0; - - ce = cache_file_exists(path, strlen(path), 0); - if (checkout_entry(ce, &state, NULL, NULL) < 0) - return error("%s: cannot checkout file", path); - return 0; -} - -static int merge_one_file_deleted(const struct object_id *orig_blob, - const struct object_id *our_blob, - const struct object_id *their_blob, const char *path, - unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode) -{ - if ((our_blob && orig_mode != our_mode) || - (their_blob && orig_mode != their_mode)) - return error(_("File %s deleted on one branch but had its " - "permissions changed on the other."), path); - - if (our_blob) { - printf("Removing %s\n", path); - - if (file_exists(path)) - remove_path(path); - } - - if (remove_file_from_cache(path)) - return error("%s: cannot remove from the index", path); - return 0; -} - -static int do_merge_one_file(const struct object_id *orig_blob, - const struct object_id *our_blob, - const struct object_id *their_blob, const char *path, - unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode) -{ - int ret, i, dest; - mmbuffer_t result = {NULL, 0}; - mmfile_t mmfs[3]; - xmparam_t xmp = {{0}}; - struct cache_entry *ce; - - if (our_mode == S_IFLNK || their_mode == S_IFLNK) - return error(_("%s: Not merging symbolic link changes."), path); - else if (our_mode == S_IFGITLINK || their_mode == S_IFGITLINK) - return error(_("%s: Not merging conflicting submodule changes."), path); - - read_mmblob(mmfs + 0, our_blob); - read_mmblob(mmfs + 2, their_blob); - - if (orig_blob) { - printf("Auto-merging %s\n", path); - read_mmblob(mmfs + 1, orig_blob); - } else { - printf("Added %s in both, but differently.\n", path); - read_mmblob(mmfs + 1, the_hash_algo->empty_blob); - } - - xmp.level = XDL_MERGE_ZEALOUS_ALNUM; - xmp.style = 0; - xmp.favor = 0; - - ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result); - - for (i = 0; i < 3; i++) - free(mmfs[i].ptr); - - if (ret > 127) - ret = 1; - - ce = cache_file_exists(path, strlen(path), 0); - if (!ce) - BUG("file is not present in the cache?"); - - unlink(path); - dest = open(path, O_WRONLY | O_CREAT, ce->ce_mode); - write_in_full(dest, result.ptr, result.size); - close(dest); - - free(result.ptr); - - if (ret) { - if (!orig_blob) - error(_("content conflict in %s"), path); - if (our_mode != their_mode) - error(_("permission conflict: %o->%o,%o in %s"), - orig_mode, our_mode, their_mode, path); - - return 1; - } - - return add_file_to_cache(path, 0); -} - -static int merge_one_file(const struct object_id *orig_blob, - const struct object_id *our_blob, - const struct object_id *their_blob, const char *path, - unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode) -{ - if (orig_blob && - ((our_blob && oideq(orig_blob, our_blob)) || - (their_blob && oideq(orig_blob, their_blob)))) - return merge_one_file_deleted(orig_blob, our_blob, their_blob, path, - orig_mode, our_mode, their_mode); - else if (!orig_blob && our_blob && !their_blob) { - return add_to_index_cacheinfo(our_mode, our_blob, path); - } else if (!orig_blob && !our_blob && their_blob) { - printf("Adding %s\n", path); - - if (file_exists(path)) - return error(_("untracked %s is overwritten by the merge."), path); - - if (add_to_index_cacheinfo(their_mode, their_blob, path)) - return 1; - return checkout_from_index(path); - } else if (!orig_blob && our_blob && their_blob && - oideq(our_blob, their_blob)) { - if (our_mode != their_mode) - return error(_("File %s added identically in both branches, " - "but permissions conflict %o->%o."), - path, our_mode, their_mode); - - printf("Adding %s\n", path); - - if (add_to_index_cacheinfo(our_mode, our_blob, path)) - return 1; - return checkout_from_index(path); - } else if (our_blob && their_blob) - return do_merge_one_file(orig_blob, our_blob, their_blob, path, - orig_mode, our_mode, their_mode); - else { - char *orig_hex = "", *our_hex = "", *their_hex = ""; - - if (orig_blob) - orig_hex = oid_to_hex(orig_blob); - if (our_blob) - our_hex = oid_to_hex(our_blob); - if (their_blob) - their_hex = oid_to_hex(their_blob); - - return error(_("%s: Not handling case %s -> %s -> %s"), - path, orig_hex, our_hex, their_hex); - } - - return 0; -} +#include "merge-strategies.h" static const char builtin_merge_one_file_usage[] = "git merge-one-file " @@ -244,8 +61,9 @@ int cmd_merge_one_file(int argc, const char **argv, const char *prefix) their_mode = strtol(argv[7], NULL, 8); } - ret = merge_one_file(p_orig_blob, p_our_blob, p_their_blob, argv[4], - orig_mode, our_mode, their_mode); + ret = merge_strategies_one_file(the_repository, + p_orig_blob, p_our_blob, p_their_blob, argv[4], + orig_mode, our_mode, their_mode); if (ret) { rollback_lock_file(&lock); diff --git a/merge-strategies.c b/merge-strategies.c new file mode 100644 index 0000000000..3a9fce9f22 --- /dev/null +++ b/merge-strategies.c @@ -0,0 +1,191 @@ +#include "cache.h" +#include "dir.h" +#include "merge-strategies.h" +#include "xdiff-interface.h" + +static int add_to_index_cacheinfo(struct index_state *istate, + unsigned int mode, + const struct object_id *oid, const char *path) +{ + struct cache_entry *ce; + int len, option; + + if (!verify_path(path, mode)) + return error(_("Invalid path '%s'"), path); + + len = strlen(path); + ce = make_empty_cache_entry(istate, len); + + oidcpy(&ce->oid, oid); + memcpy(ce->name, path, len); + ce->ce_flags = create_ce_flags(0); + ce->ce_namelen = len; + ce->ce_mode = create_ce_mode(mode); + if (assume_unchanged) + ce->ce_flags |= CE_VALID; + option = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE; + if (add_index_entry(istate, ce, option)) + return error(_("%s: cannot add to the index"), path); + + return 0; +} + +static int checkout_from_index(struct index_state *istate, const char *path) +{ + struct checkout state = CHECKOUT_INIT; + struct cache_entry *ce; + + state.istate = istate; + state.force = 1; + state.base_dir = ""; + state.base_dir_len = 0; + + ce = index_file_exists(istate, path, strlen(path), 0); + if (checkout_entry(ce, &state, NULL, NULL) < 0) + return error(_("%s: cannot checkout file"), path); + return 0; +} + +static int merge_one_file_deleted(struct index_state *istate, + const struct object_id *orig_blob, + const struct object_id *our_blob, + const struct object_id *their_blob, const char *path, + unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode) +{ + if ((our_blob && orig_mode != our_mode) || + (their_blob && orig_mode != their_mode)) + return error(_("File %s deleted on one branch but had its " + "permissions changed on the other."), path); + + if (our_blob) { + printf("Removing %s\n", path); + + if (file_exists(path)) + remove_path(path); + } + + if (remove_file_from_index(istate, path)) + return error("%s: cannot remove from the index", path); + return 0; +} + +static int do_merge_one_file(struct index_state *istate, + const struct object_id *orig_blob, + const struct object_id *our_blob, + const struct object_id *their_blob, const char *path, + unsigned int orig_mode, unsigned int our_mode, unsigned int their_mode) +{ + int ret, i, dest; + mmbuffer_t result = {NULL, 0}; + mmfile_t mmfs[3]; + xmparam_t xmp = {{0}}; + struct cache_entry *ce; + + if (our_mode == S_IFLNK || their_mode == S_IFLNK) + return error(_("%s: Not merging symbolic link changes."), path); + else if (our_mode == S_IFGITLINK || their_mode == S_IFGITLINK) + return error(_("%s: Not merging conflicting submodule changes."), path); + + read_mmblob(mmfs + 0, our_blob); + read_mmblob(mmfs + 2, their_blob); + + if (orig_blob) { + printf("Auto-merging %s\n", path); + read_mmblob(mmfs + 1, orig_blob); + } else { + printf("Added %s in both, but differently.\n", path); + read_mmblob(mmfs + 1, &null_oid); + } + + xmp.level = XDL_MERGE_ZEALOUS_ALNUM; + xmp.style = 0; + xmp.favor = 0; + + ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result); + + for (i = 0; i < 3; i++) + free(mmfs[i].ptr); + + if (ret > 127) + ret = 1; + + ce = index_file_exists(istate, path, strlen(path), 0); + if (!ce) + BUG("file is not present in the cache?"); + + unlink(path); + dest = open(path, O_WRONLY | O_CREAT, ce->ce_mode); + write_in_full(dest, result.ptr, result.size); + close(dest); + + free(result.ptr); + + if (ret) { + if (!orig_blob) + error(_("content conflict in %s"), path); + if (our_mode != their_mode) + error(_("permission conflict: %o->%o,%o in %s"), + orig_mode, our_mode, their_mode, path); + + return 1; + } + + return add_file_to_index(istate, path, 0); +} + +int merge_strategies_one_file(struct repository *r, + const struct object_id *orig_blob, + const struct object_id *our_blob, + const struct object_id *their_blob, const char *path, + unsigned int orig_mode, unsigned int our_mode, + unsigned int their_mode) +{ + if (orig_blob && + ((our_blob && oideq(orig_blob, our_blob)) || + (their_blob && oideq(orig_blob, their_blob)))) + return merge_one_file_deleted(r->index, + orig_blob, our_blob, their_blob, path, + orig_mode, our_mode, their_mode); + else if (!orig_blob && our_blob && !their_blob) { + return add_to_index_cacheinfo(r->index, our_mode, our_blob, path); + } else if (!orig_blob && !our_blob && their_blob) { + printf("Adding %s\n", path); + + if (file_exists(path)) + return error(_("untracked %s is overwritten by the merge."), path); + + if (add_to_index_cacheinfo(r->index, their_mode, their_blob, path)) + return 1; + return checkout_from_index(r->index, path); + } else if (!orig_blob && our_blob && their_blob && + oideq(our_blob, their_blob)) { + if (our_mode != their_mode) + return error(_("File %s added identically in both branches, " + "but permissions conflict %o->%o."), + path, our_mode, their_mode); + + printf("Adding %s\n", path); + + if (add_to_index_cacheinfo(r->index, our_mode, our_blob, path)) + return 1; + return checkout_from_index(r->index, path); + } else if (our_blob && their_blob) + return do_merge_one_file(r->index, + orig_blob, our_blob, their_blob, path, + orig_mode, our_mode, their_mode); + else { + char *orig_hex = "", *our_hex = "", *their_hex = ""; + + if (orig_blob) + orig_hex = oid_to_hex(orig_blob); + if (our_blob) + our_hex = oid_to_hex(our_blob); + if (their_blob) + their_hex = oid_to_hex(their_blob); + + return error(_("%s: Not handling case %s -> %s -> %s"), + path, orig_hex, our_hex, their_hex); + } + + return 0; +} diff --git a/merge-strategies.h b/merge-strategies.h new file mode 100644 index 0000000000..b527d145c7 --- /dev/null +++ b/merge-strategies.h @@ -0,0 +1,13 @@ +#ifndef MERGE_STRATEGIES_H +#define MERGE_STRATEGIES_H + +#include "object.h" + +int merge_strategies_one_file(struct repository *r, + const struct object_id *orig_blob, + const struct object_id *our_blob, + const struct object_id *their_blob, const char *path, + unsigned int orig_mode, unsigned int our_mode, + unsigned int their_mode); + +#endif /* MERGE_STRATEGIES_H */ -- 2.27.0.139.gc9c318d6bf