| /* |
| * Builtin "git merge" |
| * |
| * Copyright (c) 2008 Miklos Vajna <vmiklos@frugalware.org> |
| * |
| * Based on git-merge.sh by Junio C Hamano. |
| */ |
| |
| #define USE_THE_INDEX_COMPATIBILITY_MACROS |
| #include "cache.h" |
| #include "config.h" |
| #include "parse-options.h" |
| #include "builtin.h" |
| #include "lockfile.h" |
| #include "run-command.h" |
| #include "diff.h" |
| #include "refs.h" |
| #include "refspec.h" |
| #include "commit.h" |
| #include "diffcore.h" |
| #include "revision.h" |
| #include "unpack-trees.h" |
| #include "cache-tree.h" |
| #include "dir.h" |
| #include "utf8.h" |
| #include "log-tree.h" |
| #include "color.h" |
| #include "rerere.h" |
| #include "help.h" |
| #include "merge-recursive.h" |
| #include "resolve-undo.h" |
| #include "remote.h" |
| #include "fmt-merge-msg.h" |
| #include "gpg-interface.h" |
| #include "sequencer.h" |
| #include "string-list.h" |
| #include "packfile.h" |
| #include "tag.h" |
| #include "alias.h" |
| #include "branch.h" |
| #include "commit-reach.h" |
| #include "wt-status.h" |
| #include "commit-graph.h" |
| |
| #define DEFAULT_TWOHEAD (1<<0) |
| #define DEFAULT_OCTOPUS (1<<1) |
| #define NO_FAST_FORWARD (1<<2) |
| #define NO_TRIVIAL (1<<3) |
| |
| struct strategy { |
| const char *name; |
| unsigned attr; |
| }; |
| |
| static const char * const builtin_merge_usage[] = { |
| N_("git merge [<options>] [<commit>...]"), |
| N_("git merge --abort"), |
| N_("git merge --continue"), |
| NULL |
| }; |
| |
| static int show_diffstat = 1, shortlog_len = -1, squash; |
| static int option_commit = -1; |
| static int option_edit = -1; |
| static int allow_trivial = 1, have_message, verify_signatures; |
| static int check_trust_level = 1; |
| static int overwrite_ignore = 1; |
| static struct strbuf merge_msg = STRBUF_INIT; |
| static struct strategy **use_strategies; |
| static size_t use_strategies_nr, use_strategies_alloc; |
| static const char **xopts; |
| static size_t xopts_nr, xopts_alloc; |
| static const char *branch; |
| static char *branch_mergeoptions; |
| static int option_renormalize; |
| static int verbosity; |
| static int allow_rerere_auto; |
| static int abort_current_merge; |
| static int quit_current_merge; |
| static int continue_current_merge; |
| static int allow_unrelated_histories; |
| static int show_progress = -1; |
| static int default_to_upstream = 1; |
| static int signoff; |
| static const char *sign_commit; |
| static int autostash; |
| static int no_verify; |
| |
| static struct strategy all_strategy[] = { |
| { "recursive", DEFAULT_TWOHEAD | NO_TRIVIAL }, |
| { "octopus", DEFAULT_OCTOPUS }, |
| { "resolve", 0 }, |
| { "ours", NO_FAST_FORWARD | NO_TRIVIAL }, |
| { "subtree", NO_FAST_FORWARD | NO_TRIVIAL }, |
| }; |
| |
| static const char *pull_twohead, *pull_octopus; |
| |
| enum ff_type { |
| FF_NO, |
| FF_ALLOW, |
| FF_ONLY |
| }; |
| |
| static enum ff_type fast_forward = FF_ALLOW; |
| |
| static const char *cleanup_arg; |
| static enum commit_msg_cleanup_mode cleanup_mode; |
| |
| static int option_parse_message(const struct option *opt, |
| const char *arg, int unset) |
| { |
| struct strbuf *buf = opt->value; |
| |
| if (unset) |
| strbuf_setlen(buf, 0); |
| else if (arg) { |
| strbuf_addf(buf, "%s%s", buf->len ? "\n\n" : "", arg); |
| have_message = 1; |
| } else |
| return error(_("switch `m' requires a value")); |
| return 0; |
| } |
| |
| static enum parse_opt_result option_read_message(struct parse_opt_ctx_t *ctx, |
| const struct option *opt, |
| const char *arg_not_used, |
| int unset) |
| { |
| struct strbuf *buf = opt->value; |
| const char *arg; |
| |
| BUG_ON_OPT_ARG(arg_not_used); |
| if (unset) |
| BUG("-F cannot be negated"); |
| |
| if (ctx->opt) { |
| arg = ctx->opt; |
| ctx->opt = NULL; |
| } else if (ctx->argc > 1) { |
| ctx->argc--; |
| arg = *++ctx->argv; |
| } else |
| return error(_("option `%s' requires a value"), opt->long_name); |
| |
| if (buf->len) |
| strbuf_addch(buf, '\n'); |
| if (ctx->prefix && !is_absolute_path(arg)) |
| arg = prefix_filename(ctx->prefix, arg); |
| if (strbuf_read_file(buf, arg, 0) < 0) |
| return error(_("could not read file '%s'"), arg); |
| have_message = 1; |
| |
| return 0; |
| } |
| |
| static struct strategy *get_strategy(const char *name) |
| { |
| int i; |
| struct strategy *ret; |
| static struct cmdnames main_cmds, other_cmds; |
| static int loaded; |
| |
| if (!name) |
| return NULL; |
| |
| for (i = 0; i < ARRAY_SIZE(all_strategy); i++) |
| if (!strcmp(name, all_strategy[i].name)) |
| return &all_strategy[i]; |
| |
| if (!loaded) { |
| struct cmdnames not_strategies; |
| loaded = 1; |
| |
| memset(¬_strategies, 0, sizeof(struct cmdnames)); |
| load_command_list("git-merge-", &main_cmds, &other_cmds); |
| for (i = 0; i < main_cmds.cnt; i++) { |
| int j, found = 0; |
| struct cmdname *ent = main_cmds.names[i]; |
| for (j = 0; j < ARRAY_SIZE(all_strategy); j++) |
| if (!strncmp(ent->name, all_strategy[j].name, ent->len) |
| && !all_strategy[j].name[ent->len]) |
| found = 1; |
| if (!found) |
| add_cmdname(¬_strategies, ent->name, ent->len); |
| } |
| exclude_cmds(&main_cmds, ¬_strategies); |
| } |
| if (!is_in_cmdlist(&main_cmds, name) && !is_in_cmdlist(&other_cmds, name)) { |
| fprintf(stderr, _("Could not find merge strategy '%s'.\n"), name); |
| fprintf(stderr, _("Available strategies are:")); |
| for (i = 0; i < main_cmds.cnt; i++) |
| fprintf(stderr, " %s", main_cmds.names[i]->name); |
| fprintf(stderr, ".\n"); |
| if (other_cmds.cnt) { |
| fprintf(stderr, _("Available custom strategies are:")); |
| for (i = 0; i < other_cmds.cnt; i++) |
| fprintf(stderr, " %s", other_cmds.names[i]->name); |
| fprintf(stderr, ".\n"); |
| } |
| exit(1); |
| } |
| |
| ret = xcalloc(1, sizeof(struct strategy)); |
| ret->name = xstrdup(name); |
| ret->attr = NO_TRIVIAL; |
| return ret; |
| } |
| |
| static void append_strategy(struct strategy *s) |
| { |
| ALLOC_GROW(use_strategies, use_strategies_nr + 1, use_strategies_alloc); |
| use_strategies[use_strategies_nr++] = s; |
| } |
| |
| static int option_parse_strategy(const struct option *opt, |
| const char *name, int unset) |
| { |
| if (unset) |
| return 0; |
| |
| append_strategy(get_strategy(name)); |
| return 0; |
| } |
| |
| static int option_parse_x(const struct option *opt, |
| const char *arg, int unset) |
| { |
| if (unset) |
| return 0; |
| |
| ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc); |
| xopts[xopts_nr++] = xstrdup(arg); |
| return 0; |
| } |
| |
| static int option_parse_n(const struct option *opt, |
| const char *arg, int unset) |
| { |
| BUG_ON_OPT_ARG(arg); |
| show_diffstat = unset; |
| return 0; |
| } |
| |
| static struct option builtin_merge_options[] = { |
| OPT_CALLBACK_F('n', NULL, NULL, NULL, |
| N_("do not show a diffstat at the end of the merge"), |
| PARSE_OPT_NOARG, option_parse_n), |
| OPT_BOOL(0, "stat", &show_diffstat, |
| N_("show a diffstat at the end of the merge")), |
| OPT_BOOL(0, "summary", &show_diffstat, N_("(synonym to --stat)")), |
| { OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"), |
| N_("add (at most <n>) entries from shortlog to merge commit message"), |
| PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN }, |
| OPT_BOOL(0, "squash", &squash, |
| N_("create a single commit instead of doing a merge")), |
| OPT_BOOL(0, "commit", &option_commit, |
| N_("perform a commit if the merge succeeds (default)")), |
| OPT_BOOL('e', "edit", &option_edit, |
| N_("edit message before committing")), |
| OPT_CLEANUP(&cleanup_arg), |
| OPT_SET_INT(0, "ff", &fast_forward, N_("allow fast-forward (default)"), FF_ALLOW), |
| OPT_SET_INT_F(0, "ff-only", &fast_forward, |
| N_("abort if fast-forward is not possible"), |
| FF_ONLY, PARSE_OPT_NONEG), |
| OPT_RERERE_AUTOUPDATE(&allow_rerere_auto), |
| OPT_BOOL(0, "verify-signatures", &verify_signatures, |
| N_("verify that the named commit has a valid GPG signature")), |
| OPT_CALLBACK('s', "strategy", &use_strategies, N_("strategy"), |
| N_("merge strategy to use"), option_parse_strategy), |
| OPT_CALLBACK('X', "strategy-option", &xopts, N_("option=value"), |
| N_("option for selected merge strategy"), option_parse_x), |
| OPT_CALLBACK('m', "message", &merge_msg, N_("message"), |
| N_("merge commit message (for a non-fast-forward merge)"), |
| option_parse_message), |
| { OPTION_LOWLEVEL_CALLBACK, 'F', "file", &merge_msg, N_("path"), |
| N_("read message from file"), PARSE_OPT_NONEG, |
| NULL, 0, option_read_message }, |
| OPT__VERBOSITY(&verbosity), |
| OPT_BOOL(0, "abort", &abort_current_merge, |
| N_("abort the current in-progress merge")), |
| OPT_BOOL(0, "quit", &quit_current_merge, |
| N_("--abort but leave index and working tree alone")), |
| OPT_BOOL(0, "continue", &continue_current_merge, |
| N_("continue the current in-progress merge")), |
| OPT_BOOL(0, "allow-unrelated-histories", &allow_unrelated_histories, |
| N_("allow merging unrelated histories")), |
| OPT_SET_INT(0, "progress", &show_progress, N_("force progress reporting"), 1), |
| { OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key-id"), |
| N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" }, |
| OPT_AUTOSTASH(&autostash), |
| OPT_BOOL(0, "overwrite-ignore", &overwrite_ignore, N_("update ignored files (default)")), |
| OPT_BOOL(0, "signoff", &signoff, N_("add Signed-off-by:")), |
| OPT_BOOL(0, "no-verify", &no_verify, N_("bypass pre-merge-commit and commit-msg hooks")), |
| OPT_END() |
| }; |
| |
| static int save_state(struct object_id *stash) |
| { |
| int len; |
| struct child_process cp = CHILD_PROCESS_INIT; |
| struct strbuf buffer = STRBUF_INIT; |
| const char *argv[] = {"stash", "create", NULL}; |
| int rc = -1; |
| |
| cp.argv = argv; |
| cp.out = -1; |
| cp.git_cmd = 1; |
| |
| if (start_command(&cp)) |
| die(_("could not run stash.")); |
| len = strbuf_read(&buffer, cp.out, 1024); |
| close(cp.out); |
| |
| if (finish_command(&cp) || len < 0) |
| die(_("stash failed")); |
| else if (!len) /* no changes */ |
| goto out; |
| strbuf_setlen(&buffer, buffer.len-1); |
| if (get_oid(buffer.buf, stash)) |
| die(_("not a valid object: %s"), buffer.buf); |
| rc = 0; |
| out: |
| strbuf_release(&buffer); |
| return rc; |
| } |
| |
| static void read_empty(const struct object_id *oid, int verbose) |
| { |
| int i = 0; |
| const char *args[7]; |
| |
| args[i++] = "read-tree"; |
| if (verbose) |
| args[i++] = "-v"; |
| args[i++] = "-m"; |
| args[i++] = "-u"; |
| args[i++] = empty_tree_oid_hex(); |
| args[i++] = oid_to_hex(oid); |
| args[i] = NULL; |
| |
| if (run_command_v_opt(args, RUN_GIT_CMD)) |
| die(_("read-tree failed")); |
| } |
| |
| static void reset_hard(const struct object_id *oid, int verbose) |
| { |
| int i = 0; |
| const char *args[6]; |
| |
| args[i++] = "read-tree"; |
| if (verbose) |
| args[i++] = "-v"; |
| args[i++] = "--reset"; |
| args[i++] = "-u"; |
| args[i++] = oid_to_hex(oid); |
| args[i] = NULL; |
| |
| if (run_command_v_opt(args, RUN_GIT_CMD)) |
| die(_("read-tree failed")); |
| } |
| |
| static void restore_state(const struct object_id *head, |
| const struct object_id *stash) |
| { |
| struct strbuf sb = STRBUF_INIT; |
| const char *args[] = { "stash", "apply", NULL, NULL }; |
| |
| if (is_null_oid(stash)) |
| return; |
| |
| reset_hard(head, 1); |
| |
| args[2] = oid_to_hex(stash); |
| |
| /* |
| * It is OK to ignore error here, for example when there was |
| * nothing to restore. |
| */ |
| run_command_v_opt(args, RUN_GIT_CMD); |
| |
| strbuf_release(&sb); |
| refresh_cache(REFRESH_QUIET); |
| } |
| |
| /* This is called when no merge was necessary. */ |
| static void finish_up_to_date(const char *msg) |
| { |
| if (verbosity >= 0) |
| printf("%s%s\n", squash ? _(" (nothing to squash)") : "", msg); |
| remove_merge_branch_state(the_repository); |
| } |
| |
| static void squash_message(struct commit *commit, struct commit_list *remoteheads) |
| { |
| struct rev_info rev; |
| struct strbuf out = STRBUF_INIT; |
| struct commit_list *j; |
| struct pretty_print_context ctx = {0}; |
| |
| printf(_("Squash commit -- not updating HEAD\n")); |
| |
| repo_init_revisions(the_repository, &rev, NULL); |
| rev.ignore_merges = 1; |
| rev.commit_format = CMIT_FMT_MEDIUM; |
| |
| commit->object.flags |= UNINTERESTING; |
| add_pending_object(&rev, &commit->object, NULL); |
| |
| for (j = remoteheads; j; j = j->next) |
| add_pending_object(&rev, &j->item->object, NULL); |
| |
| setup_revisions(0, NULL, &rev, NULL); |
| if (prepare_revision_walk(&rev)) |
| die(_("revision walk setup failed")); |
| |
| ctx.abbrev = rev.abbrev; |
| ctx.date_mode = rev.date_mode; |
| ctx.fmt = rev.commit_format; |
| |
| strbuf_addstr(&out, "Squashed commit of the following:\n"); |
| while ((commit = get_revision(&rev)) != NULL) { |
| strbuf_addch(&out, '\n'); |
| strbuf_addf(&out, "commit %s\n", |
| oid_to_hex(&commit->object.oid)); |
| pretty_print_commit(&ctx, commit, &out); |
| } |
| write_file_buf(git_path_squash_msg(the_repository), out.buf, out.len); |
| strbuf_release(&out); |
| } |
| |
| static void finish(struct commit *head_commit, |
| struct commit_list *remoteheads, |
| const struct object_id *new_head, const char *msg) |
| { |
| struct strbuf reflog_message = STRBUF_INIT; |
| const struct object_id *head = &head_commit->object.oid; |
| |
| if (!msg) |
| strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION")); |
| else { |
| if (verbosity >= 0) |
| printf("%s\n", msg); |
| strbuf_addf(&reflog_message, "%s: %s", |
| getenv("GIT_REFLOG_ACTION"), msg); |
| } |
| if (squash) { |
| squash_message(head_commit, remoteheads); |
| } else { |
| if (verbosity >= 0 && !merge_msg.len) |
| printf(_("No merge message -- not updating HEAD\n")); |
| else { |
| update_ref(reflog_message.buf, "HEAD", new_head, head, |
| 0, UPDATE_REFS_DIE_ON_ERR); |
| /* |
| * We ignore errors in 'gc --auto', since the |
| * user should see them. |
| */ |
| close_object_store(the_repository->objects); |
| run_auto_gc(verbosity < 0); |
| } |
| } |
| if (new_head && show_diffstat) { |
| struct diff_options opts; |
| repo_diff_setup(the_repository, &opts); |
| opts.stat_width = -1; /* use full terminal width */ |
| opts.stat_graph_width = -1; /* respect statGraphWidth config */ |
| opts.output_format |= |
| DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT; |
| opts.detect_rename = DIFF_DETECT_RENAME; |
| diff_setup_done(&opts); |
| diff_tree_oid(head, new_head, "", &opts); |
| diffcore_std(&opts); |
| diff_flush(&opts); |
| } |
| |
| /* Run a post-merge hook */ |
| run_hook_le(NULL, "post-merge", squash ? "1" : "0", NULL); |
| |
| apply_autostash(git_path_merge_autostash(the_repository)); |
| strbuf_release(&reflog_message); |
| } |
| |
| /* Get the name for the merge commit's message. */ |
| static void merge_name(const char *remote, struct strbuf *msg) |
| { |
| struct commit *remote_head; |
| struct object_id branch_head; |
| struct strbuf buf = STRBUF_INIT; |
| struct strbuf bname = STRBUF_INIT; |
| struct merge_remote_desc *desc; |
| const char *ptr; |
| char *found_ref; |
| int len, early; |
| |
| strbuf_branchname(&bname, remote, 0); |
| remote = bname.buf; |
| |
| oidclr(&branch_head); |
| remote_head = get_merge_parent(remote); |
| if (!remote_head) |
| die(_("'%s' does not point to a commit"), remote); |
| |
| if (dwim_ref(remote, strlen(remote), &branch_head, &found_ref) > 0) { |
| if (starts_with(found_ref, "refs/heads/")) { |
| strbuf_addf(msg, "%s\t\tbranch '%s' of .\n", |
| oid_to_hex(&branch_head), remote); |
| goto cleanup; |
| } |
| if (starts_with(found_ref, "refs/tags/")) { |
| strbuf_addf(msg, "%s\t\ttag '%s' of .\n", |
| oid_to_hex(&branch_head), remote); |
| goto cleanup; |
| } |
| if (starts_with(found_ref, "refs/remotes/")) { |
| strbuf_addf(msg, "%s\t\tremote-tracking branch '%s' of .\n", |
| oid_to_hex(&branch_head), remote); |
| goto cleanup; |
| } |
| } |
| |
| /* See if remote matches <name>^^^.. or <name>~<number> */ |
| for (len = 0, ptr = remote + strlen(remote); |
| remote < ptr && ptr[-1] == '^'; |
| ptr--) |
| len++; |
| if (len) |
| early = 1; |
| else { |
| early = 0; |
| ptr = strrchr(remote, '~'); |
| if (ptr) { |
| int seen_nonzero = 0; |
| |
| len++; /* count ~ */ |
| while (*++ptr && isdigit(*ptr)) { |
| seen_nonzero |= (*ptr != '0'); |
| len++; |
| } |
| if (*ptr) |
| len = 0; /* not ...~<number> */ |
| else if (seen_nonzero) |
| early = 1; |
| else if (len == 1) |
| early = 1; /* "name~" is "name~1"! */ |
| } |
| } |
| if (len) { |
| struct strbuf truname = STRBUF_INIT; |
| strbuf_addf(&truname, "refs/heads/%s", remote); |
| strbuf_setlen(&truname, truname.len - len); |
| if (ref_exists(truname.buf)) { |
| strbuf_addf(msg, |
| "%s\t\tbranch '%s'%s of .\n", |
| oid_to_hex(&remote_head->object.oid), |
| truname.buf + 11, |
| (early ? " (early part)" : "")); |
| strbuf_release(&truname); |
| goto cleanup; |
| } |
| strbuf_release(&truname); |
| } |
| |
| desc = merge_remote_util(remote_head); |
| if (desc && desc->obj && desc->obj->type == OBJ_TAG) { |
| strbuf_addf(msg, "%s\t\t%s '%s'\n", |
| oid_to_hex(&desc->obj->oid), |
| type_name(desc->obj->type), |
| remote); |
| goto cleanup; |
| } |
| |
| strbuf_addf(msg, "%s\t\tcommit '%s'\n", |
| oid_to_hex(&remote_head->object.oid), remote); |
| cleanup: |
| strbuf_release(&buf); |
| strbuf_release(&bname); |
| } |
| |
| static void parse_branch_merge_options(char *bmo) |
| { |
| const char **argv; |
| int argc; |
| |
| if (!bmo) |
| return; |
| argc = split_cmdline(bmo, &argv); |
| if (argc < 0) |
| die(_("Bad branch.%s.mergeoptions string: %s"), branch, |
| _(split_cmdline_strerror(argc))); |
| REALLOC_ARRAY(argv, argc + 2); |
| MOVE_ARRAY(argv + 1, argv, argc + 1); |
| argc++; |
| argv[0] = "branch.*.mergeoptions"; |
| parse_options(argc, argv, NULL, builtin_merge_options, |
| builtin_merge_usage, 0); |
| free(argv); |
| } |
| |
| static int git_merge_config(const char *k, const char *v, void *cb) |
| { |
| int status; |
| const char *str; |
| |
| if (branch && |
| skip_prefix(k, "branch.", &str) && |
| skip_prefix(str, branch, &str) && |
| !strcmp(str, ".mergeoptions")) { |
| free(branch_mergeoptions); |
| branch_mergeoptions = xstrdup(v); |
| return 0; |
| } |
| |
| if (!strcmp(k, "merge.diffstat") || !strcmp(k, "merge.stat")) |
| show_diffstat = git_config_bool(k, v); |
| else if (!strcmp(k, "merge.verifysignatures")) |
| verify_signatures = git_config_bool(k, v); |
| else if (!strcmp(k, "pull.twohead")) |
| return git_config_string(&pull_twohead, k, v); |
| else if (!strcmp(k, "pull.octopus")) |
| return git_config_string(&pull_octopus, k, v); |
| else if (!strcmp(k, "commit.cleanup")) |
| return git_config_string(&cleanup_arg, k, v); |
| else if (!strcmp(k, "merge.renormalize")) |
| option_renormalize = git_config_bool(k, v); |
| else if (!strcmp(k, "merge.ff")) { |
| int boolval = git_parse_maybe_bool(v); |
| if (0 <= boolval) { |
| fast_forward = boolval ? FF_ALLOW : FF_NO; |
| } else if (v && !strcmp(v, "only")) { |
| fast_forward = FF_ONLY; |
| } /* do not barf on values from future versions of git */ |
| return 0; |
| } else if (!strcmp(k, "merge.defaulttoupstream")) { |
| default_to_upstream = git_config_bool(k, v); |
| return 0; |
| } else if (!strcmp(k, "commit.gpgsign")) { |
| sign_commit = git_config_bool(k, v) ? "" : NULL; |
| return 0; |
| } else if (!strcmp(k, "gpg.mintrustlevel")) { |
| check_trust_level = 0; |
| } else if (!strcmp(k, "merge.autostash")) { |
| autostash = git_config_bool(k, v); |
| return 0; |
| } |
| |
| status = fmt_merge_msg_config(k, v, cb); |
| if (status) |
| return status; |
| status = git_gpg_config(k, v, NULL); |
| if (status) |
| return status; |
| return git_diff_ui_config(k, v, cb); |
| } |
| |
| static int read_tree_trivial(struct object_id *common, struct object_id *head, |
| struct object_id *one) |
| { |
| int i, nr_trees = 0; |
| struct tree *trees[MAX_UNPACK_TREES]; |
| struct tree_desc t[MAX_UNPACK_TREES]; |
| struct unpack_trees_options opts; |
| |
| memset(&opts, 0, sizeof(opts)); |
| opts.head_idx = 2; |
| opts.src_index = &the_index; |
| opts.dst_index = &the_index; |
| opts.update = 1; |
| opts.verbose_update = 1; |
| opts.trivial_merges_only = 1; |
| opts.merge = 1; |
| trees[nr_trees] = parse_tree_indirect(common); |
| if (!trees[nr_trees++]) |
| return -1; |
| trees[nr_trees] = parse_tree_indirect(head); |
| if (!trees[nr_trees++]) |
| return -1; |
| trees[nr_trees] = parse_tree_indirect(one); |
| if (!trees[nr_trees++]) |
| return -1; |
| opts.fn = threeway_merge; |
| cache_tree_free(&active_cache_tree); |
| for (i = 0; i < nr_trees; i++) { |
| parse_tree(trees[i]); |
| init_tree_desc(t+i, trees[i]->buffer, trees[i]->size); |
| } |
| if (unpack_trees(nr_trees, t, &opts)) |
| return -1; |
| return 0; |
| } |
| |
| static void write_tree_trivial(struct object_id *oid) |
| { |
| if (write_cache_as_tree(oid, 0, NULL)) |
| die(_("git write-tree failed to write a tree")); |
| } |
| |
| static int try_merge_strategy(const char *strategy, struct commit_list *common, |
| struct commit_list *remoteheads, |
| struct commit *head) |
| { |
| const char *head_arg = "HEAD"; |
| |
| if (refresh_and_write_cache(REFRESH_QUIET, SKIP_IF_UNCHANGED, 0) < 0) |
| return error(_("Unable to write index.")); |
| |
| if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) { |
| struct lock_file lock = LOCK_INIT; |
| int clean, x; |
| struct commit *result; |
| struct commit_list *reversed = NULL; |
| struct merge_options o; |
| struct commit_list *j; |
| |
| if (remoteheads->next) { |
| error(_("Not handling anything other than two heads merge.")); |
| return 2; |
| } |
| |
| init_merge_options(&o, the_repository); |
| if (!strcmp(strategy, "subtree")) |
| o.subtree_shift = ""; |
| |
| o.renormalize = option_renormalize; |
| o.show_rename_progress = |
| show_progress == -1 ? isatty(2) : show_progress; |
| |
| for (x = 0; x < xopts_nr; x++) |
| if (parse_merge_opt(&o, xopts[x])) |
| die(_("Unknown option for merge-recursive: -X%s"), xopts[x]); |
| |
| o.branch1 = head_arg; |
| o.branch2 = merge_remote_util(remoteheads->item)->name; |
| |
| for (j = common; j; j = j->next) |
| commit_list_insert(j->item, &reversed); |
| |
| hold_locked_index(&lock, LOCK_DIE_ON_ERROR); |
| clean = merge_recursive(&o, head, |
| remoteheads->item, reversed, &result); |
| if (clean < 0) |
| exit(128); |
| if (write_locked_index(&the_index, &lock, |
| COMMIT_LOCK | SKIP_IF_UNCHANGED)) |
| die(_("unable to write %s"), get_index_file()); |
| return clean ? 0 : 1; |
| } else { |
| return try_merge_command(the_repository, |
| strategy, xopts_nr, xopts, |
| common, head_arg, remoteheads); |
| } |
| } |
| |
| static void count_diff_files(struct diff_queue_struct *q, |
| struct diff_options *opt, void *data) |
| { |
| int *count = data; |
| |
| (*count) += q->nr; |
| } |
| |
| static int count_unmerged_entries(void) |
| { |
| int i, ret = 0; |
| |
| for (i = 0; i < active_nr; i++) |
| if (ce_stage(active_cache[i])) |
| ret++; |
| |
| return ret; |
| } |
| |
| static void add_strategies(const char *string, unsigned attr) |
| { |
| int i; |
| |
| if (string) { |
| struct string_list list = STRING_LIST_INIT_DUP; |
| struct string_list_item *item; |
| string_list_split(&list, string, ' ', -1); |
| for_each_string_list_item(item, &list) |
| append_strategy(get_strategy(item->string)); |
| string_list_clear(&list, 0); |
| return; |
| } |
| for (i = 0; i < ARRAY_SIZE(all_strategy); i++) |
| if (all_strategy[i].attr & attr) |
| append_strategy(&all_strategy[i]); |
| |
| } |
| |
| static void read_merge_msg(struct strbuf *msg) |
| { |
| const char *filename = git_path_merge_msg(the_repository); |
| strbuf_reset(msg); |
| if (strbuf_read_file(msg, filename, 0) < 0) |
| die_errno(_("Could not read from '%s'"), filename); |
| } |
| |
| static void write_merge_state(struct commit_list *); |
| static void abort_commit(struct commit_list *remoteheads, const char *err_msg) |
| { |
| if (err_msg) |
| error("%s", err_msg); |
| fprintf(stderr, |
| _("Not committing merge; use 'git commit' to complete the merge.\n")); |
| write_merge_state(remoteheads); |
| exit(1); |
| } |
| |
| static const char merge_editor_comment[] = |
| N_("Please enter a commit message to explain why this merge is necessary,\n" |
| "especially if it merges an updated upstream into a topic branch.\n" |
| "\n"); |
| |
| static const char scissors_editor_comment[] = |
| N_("An empty message aborts the commit.\n"); |
| |
| static const char no_scissors_editor_comment[] = |
| N_("Lines starting with '%c' will be ignored, and an empty message aborts\n" |
| "the commit.\n"); |
| |
| static void write_merge_heads(struct commit_list *); |
| static void prepare_to_commit(struct commit_list *remoteheads) |
| { |
| struct strbuf msg = STRBUF_INIT; |
| const char *index_file = get_index_file(); |
| |
| if (!no_verify && run_commit_hook(0 < option_edit, index_file, "pre-merge-commit", NULL)) |
| abort_commit(remoteheads, NULL); |
| /* |
| * Re-read the index as pre-merge-commit hook could have updated it, |
| * and write it out as a tree. We must do this before we invoke |
| * the editor and after we invoke run_status above. |
| */ |
| if (find_hook("pre-merge-commit")) |
| discard_cache(); |
| read_cache_from(index_file); |
| strbuf_addbuf(&msg, &merge_msg); |
| if (squash) |
| BUG("the control must not reach here under --squash"); |
| if (0 < option_edit) { |
| strbuf_addch(&msg, '\n'); |
| if (cleanup_mode == COMMIT_MSG_CLEANUP_SCISSORS) { |
| wt_status_append_cut_line(&msg); |
| strbuf_commented_addf(&msg, "\n"); |
| } |
| strbuf_commented_addf(&msg, _(merge_editor_comment)); |
| strbuf_commented_addf(&msg, _(cleanup_mode == COMMIT_MSG_CLEANUP_SCISSORS ? |
| scissors_editor_comment : |
| no_scissors_editor_comment), comment_line_char); |
| } |
| if (signoff) |
| append_signoff(&msg, ignore_non_trailer(msg.buf, msg.len), 0); |
| write_merge_heads(remoteheads); |
| write_file_buf(git_path_merge_msg(the_repository), msg.buf, msg.len); |
| if (run_commit_hook(0 < option_edit, get_index_file(), "prepare-commit-msg", |
| git_path_merge_msg(the_repository), "merge", NULL)) |
| abort_commit(remoteheads, NULL); |
| if (0 < option_edit) { |
| if (launch_editor(git_path_merge_msg(the_repository), NULL, NULL)) |
| abort_commit(remoteheads, NULL); |
| } |
| |
| if (!no_verify && run_commit_hook(0 < option_edit, get_index_file(), |
| "commit-msg", |
| git_path_merge_msg(the_repository), NULL)) |
| abort_commit(remoteheads, NULL); |
| |
| read_merge_msg(&msg); |
| cleanup_message(&msg, cleanup_mode, 0); |
| if (!msg.len) |
| abort_commit(remoteheads, _("Empty commit message.")); |
| strbuf_release(&merge_msg); |
| strbuf_addbuf(&merge_msg, &msg); |
| strbuf_release(&msg); |
| } |
| |
| static int merge_trivial(struct commit *head, struct commit_list *remoteheads) |
| { |
| struct object_id result_tree, result_commit; |
| struct commit_list *parents, **pptr = &parents; |
| |
| if (refresh_and_write_cache(REFRESH_QUIET, SKIP_IF_UNCHANGED, 0) < 0) |
| return error(_("Unable to write index.")); |
| |
| write_tree_trivial(&result_tree); |
| printf(_("Wonderful.\n")); |
| pptr = commit_list_append(head, pptr); |
| pptr = commit_list_append(remoteheads->item, pptr); |
| prepare_to_commit(remoteheads); |
| if (commit_tree(merge_msg.buf, merge_msg.len, &result_tree, parents, |
| &result_commit, NULL, sign_commit)) |
| die(_("failed to write commit object")); |
| finish(head, remoteheads, &result_commit, "In-index merge"); |
| remove_merge_branch_state(the_repository); |
| return 0; |
| } |
| |
| static int finish_automerge(struct commit *head, |
| int head_subsumed, |
| struct commit_list *common, |
| struct commit_list *remoteheads, |
| struct object_id *result_tree, |
| const char *wt_strategy) |
| { |
| struct commit_list *parents = NULL; |
| struct strbuf buf = STRBUF_INIT; |
| struct object_id result_commit; |
| |
| write_tree_trivial(result_tree); |
| free_commit_list(common); |
| parents = remoteheads; |
| if (!head_subsumed || fast_forward == FF_NO) |
| commit_list_insert(head, &parents); |
| prepare_to_commit(remoteheads); |
| if (commit_tree(merge_msg.buf, merge_msg.len, result_tree, parents, |
| &result_commit, NULL, sign_commit)) |
| die(_("failed to write commit object")); |
| strbuf_addf(&buf, "Merge made by the '%s' strategy.", wt_strategy); |
| finish(head, remoteheads, &result_commit, buf.buf); |
| strbuf_release(&buf); |
| remove_merge_branch_state(the_repository); |
| return 0; |
| } |
| |
| static int suggest_conflicts(void) |
| { |
| const char *filename; |
| FILE *fp; |
| struct strbuf msgbuf = STRBUF_INIT; |
| |
| filename = git_path_merge_msg(the_repository); |
| fp = xfopen(filename, "a"); |
| |
| /* |
| * We can't use cleanup_mode because if we're not using the editor, |
| * get_cleanup_mode will return COMMIT_MSG_CLEANUP_SPACE instead, even |
| * though the message is meant to be processed later by git-commit. |
| * Thus, we will get the cleanup mode which is returned when we _are_ |
| * using an editor. |
| */ |
| append_conflicts_hint(&the_index, &msgbuf, |
| get_cleanup_mode(cleanup_arg, 1)); |
| fputs(msgbuf.buf, fp); |
| strbuf_release(&msgbuf); |
| fclose(fp); |
| repo_rerere(the_repository, allow_rerere_auto); |
| printf(_("Automatic merge failed; " |
| "fix conflicts and then commit the result.\n")); |
| return 1; |
| } |
| |
| static int evaluate_result(void) |
| { |
| int cnt = 0; |
| struct rev_info rev; |
| |
| /* Check how many files differ. */ |
| repo_init_revisions(the_repository, &rev, ""); |
| setup_revisions(0, NULL, &rev, NULL); |
| rev.diffopt.output_format |= |
| DIFF_FORMAT_CALLBACK; |
| rev.diffopt.format_callback = count_diff_files; |
| rev.diffopt.format_callback_data = &cnt; |
| run_diff_files(&rev, 0); |
| |
| /* |
| * Check how many unmerged entries are |
| * there. |
| */ |
| cnt += count_unmerged_entries(); |
| |
| return cnt; |
| } |
| |
| /* |
| * Pretend as if the user told us to merge with the remote-tracking |
| * branch we have for the upstream of the current branch |
| */ |
| static int setup_with_upstream(const char ***argv) |
| { |
| struct branch *branch = branch_get(NULL); |
| int i; |
| const char **args; |
| |
| if (!branch) |
| die(_("No current branch.")); |
| if (!branch->remote_name) |
| die(_("No remote for the current branch.")); |
| if (!branch->merge_nr) |
| die(_("No default upstream defined for the current branch.")); |
| |
| args = xcalloc(st_add(branch->merge_nr, 1), sizeof(char *)); |
| for (i = 0; i < branch->merge_nr; i++) { |
| if (!branch->merge[i]->dst) |
| die(_("No remote-tracking branch for %s from %s"), |
| branch->merge[i]->src, branch->remote_name); |
| args[i] = branch->merge[i]->dst; |
| } |
| args[i] = NULL; |
| *argv = args; |
| return i; |
| } |
| |
| static void write_merge_heads(struct commit_list *remoteheads) |
| { |
| struct commit_list *j; |
| struct strbuf buf = STRBUF_INIT; |
| |
| for (j = remoteheads; j; j = j->next) { |
| struct object_id *oid; |
| struct commit *c = j->item; |
| struct merge_remote_desc *desc; |
| |
| desc = merge_remote_util(c); |
| if (desc && desc->obj) { |
| oid = &desc->obj->oid; |
| } else { |
| oid = &c->object.oid; |
| } |
| strbuf_addf(&buf, "%s\n", oid_to_hex(oid)); |
| } |
| write_file_buf(git_path_merge_head(the_repository), buf.buf, buf.len); |
| |
| strbuf_reset(&buf); |
| if (fast_forward == FF_NO) |
| strbuf_addstr(&buf, "no-ff"); |
| write_file_buf(git_path_merge_mode(the_repository), buf.buf, buf.len); |
| strbuf_release(&buf); |
| } |
| |
| static void write_merge_state(struct commit_list *remoteheads) |
| { |
| write_merge_heads(remoteheads); |
| strbuf_addch(&merge_msg, '\n'); |
| write_file_buf(git_path_merge_msg(the_repository), merge_msg.buf, |
| merge_msg.len); |
| } |
| |
| static int default_edit_option(void) |
| { |
| static const char name[] = "GIT_MERGE_AUTOEDIT"; |
| const char *e = getenv(name); |
| struct stat st_stdin, st_stdout; |
| |
| if (have_message) |
| /* an explicit -m msg without --[no-]edit */ |
| return 0; |
| |
| if (e) { |
| int v = git_parse_maybe_bool(e); |
| if (v < 0) |
| die(_("Bad value '%s' in environment '%s'"), e, name); |
| return v; |
| } |
| |
| /* Use editor if stdin and stdout are the same and is a tty */ |
| return (!fstat(0, &st_stdin) && |
| !fstat(1, &st_stdout) && |
| isatty(0) && isatty(1) && |
| st_stdin.st_dev == st_stdout.st_dev && |
| st_stdin.st_ino == st_stdout.st_ino && |
| st_stdin.st_mode == st_stdout.st_mode); |
| } |
| |
| static struct commit_list *reduce_parents(struct commit *head_commit, |
| int *head_subsumed, |
| struct commit_list *remoteheads) |
| { |
| struct commit_list *parents, **remotes; |
| |
| /* |
| * Is the current HEAD reachable from another commit being |
| * merged? If so we do not want to record it as a parent of |
| * the resulting merge, unless --no-ff is given. We will flip |
| * this variable to 0 when we find HEAD among the independent |
| * tips being merged. |
| */ |
| *head_subsumed = 1; |
| |
| /* Find what parents to record by checking independent ones. */ |
| parents = reduce_heads(remoteheads); |
| free_commit_list(remoteheads); |
| |
| remoteheads = NULL; |
| remotes = &remoteheads; |
| while (parents) { |
| struct commit *commit = pop_commit(&parents); |
| if (commit == head_commit) |
| *head_subsumed = 0; |
| else |
| remotes = &commit_list_insert(commit, remotes)->next; |
| } |
| return remoteheads; |
| } |
| |
| static void prepare_merge_message(struct strbuf *merge_names, struct strbuf *merge_msg) |
| { |
| struct fmt_merge_msg_opts opts; |
| |
| memset(&opts, 0, sizeof(opts)); |
| opts.add_title = !have_message; |
| opts.shortlog_len = shortlog_len; |
| opts.credit_people = (0 < option_edit); |
| |
| fmt_merge_msg(merge_names, merge_msg, &opts); |
| if (merge_msg->len) |
| strbuf_setlen(merge_msg, merge_msg->len - 1); |
| } |
| |
| static void handle_fetch_head(struct commit_list **remotes, struct strbuf *merge_names) |
| { |
| const char *filename; |
| int fd, pos, npos; |
| struct strbuf fetch_head_file = STRBUF_INIT; |
| const unsigned hexsz = the_hash_algo->hexsz; |
| |
| if (!merge_names) |
| merge_names = &fetch_head_file; |
| |
| filename = git_path_fetch_head(the_repository); |
| fd = open(filename, O_RDONLY); |
| if (fd < 0) |
| die_errno(_("could not open '%s' for reading"), filename); |
| |
| if (strbuf_read(merge_names, fd, 0) < 0) |
| die_errno(_("could not read '%s'"), filename); |
| if (close(fd) < 0) |
| die_errno(_("could not close '%s'"), filename); |
| |
| for (pos = 0; pos < merge_names->len; pos = npos) { |
| struct object_id oid; |
| char *ptr; |
| struct commit *commit; |
| |
| ptr = strchr(merge_names->buf + pos, '\n'); |
| if (ptr) |
| npos = ptr - merge_names->buf + 1; |
| else |
| npos = merge_names->len; |
| |
| if (npos - pos < hexsz + 2 || |
| get_oid_hex(merge_names->buf + pos, &oid)) |
| commit = NULL; /* bad */ |
| else if (memcmp(merge_names->buf + pos + hexsz, "\t\t", 2)) |
| continue; /* not-for-merge */ |
| else { |
| char saved = merge_names->buf[pos + hexsz]; |
| merge_names->buf[pos + hexsz] = '\0'; |
| commit = get_merge_parent(merge_names->buf + pos); |
| merge_names->buf[pos + hexsz] = saved; |
| } |
| if (!commit) { |
| if (ptr) |
| *ptr = '\0'; |
| die(_("not something we can merge in %s: %s"), |
| filename, merge_names->buf + pos); |
| } |
| remotes = &commit_list_insert(commit, remotes)->next; |
| } |
| |
| if (merge_names == &fetch_head_file) |
| strbuf_release(&fetch_head_file); |
| } |
| |
| static struct commit_list *collect_parents(struct commit *head_commit, |
| int *head_subsumed, |
| int argc, const char **argv, |
| struct strbuf *merge_msg) |
| { |
| int i; |
| struct commit_list *remoteheads = NULL; |
| struct commit_list **remotes = &remoteheads; |
| struct strbuf merge_names = STRBUF_INIT, *autogen = NULL; |
| |
| if (merge_msg && (!have_message || shortlog_len)) |
| autogen = &merge_names; |
| |
| if (head_commit) |
| remotes = &commit_list_insert(head_commit, remotes)->next; |
| |
| if (argc == 1 && !strcmp(argv[0], "FETCH_HEAD")) { |
| handle_fetch_head(remotes, autogen); |
| remoteheads = reduce_parents(head_commit, head_subsumed, remoteheads); |
| } else { |
| for (i = 0; i < argc; i++) { |
| struct commit *commit = get_merge_parent(argv[i]); |
| if (!commit) |
| help_unknown_ref(argv[i], "merge", |
| _("not something we can merge")); |
| remotes = &commit_list_insert(commit, remotes)->next; |
| } |
| remoteheads = reduce_parents(head_commit, head_subsumed, remoteheads); |
| if (autogen) { |
| struct commit_list *p; |
| for (p = remoteheads; p; p = p->next) |
| merge_name(merge_remote_util(p->item)->name, autogen); |
| } |
| } |
| |
| if (autogen) { |
| prepare_merge_message(autogen, merge_msg); |
| strbuf_release(autogen); |
| } |
| |
| return remoteheads; |
| } |
| |
| static int merging_a_throwaway_tag(struct commit *commit) |
| { |
| char *tag_ref; |
| struct object_id oid; |
| int is_throwaway_tag = 0; |
| |
| /* Are we merging a tag? */ |
| if (!merge_remote_util(commit) || |
| !merge_remote_util(commit)->obj || |
| merge_remote_util(commit)->obj->type != OBJ_TAG) |
| return is_throwaway_tag; |
| |
| /* |
| * Now we know we are merging a tag object. Are we downstream |
| * and following the tags from upstream? If so, we must have |
| * the tag object pointed at by "refs/tags/$T" where $T is the |
| * tagname recorded in the tag object. We want to allow such |
| * a "just to catch up" merge to fast-forward. |
| * |
| * Otherwise, we are playing an integrator's role, making a |
| * merge with a throw-away tag from a contributor with |
| * something like "git pull $contributor $signed_tag". |
| * We want to forbid such a merge from fast-forwarding |
| * by default; otherwise we would not keep the signature |
| * anywhere. |
| */ |
| tag_ref = xstrfmt("refs/tags/%s", |
| ((struct tag *)merge_remote_util(commit)->obj)->tag); |
| if (!read_ref(tag_ref, &oid) && |
| oideq(&oid, &merge_remote_util(commit)->obj->oid)) |
| is_throwaway_tag = 0; |
| else |
| is_throwaway_tag = 1; |
| free(tag_ref); |
| return is_throwaway_tag; |
| } |
| |
| int cmd_merge(int argc, const char **argv, const char *prefix) |
| { |
| struct object_id result_tree, stash, head_oid; |
| struct commit *head_commit; |
| struct strbuf buf = STRBUF_INIT; |
| int i, ret = 0, head_subsumed; |
| int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0; |
| struct commit_list *common = NULL; |
| const char *best_strategy = NULL, *wt_strategy = NULL; |
| struct commit_list *remoteheads, *p; |
| void *branch_to_free; |
| int orig_argc = argc; |
| |
| if (argc == 2 && !strcmp(argv[1], "-h")) |
| usage_with_options(builtin_merge_usage, builtin_merge_options); |
| |
| /* |
| * Check if we are _not_ on a detached HEAD, i.e. if there is a |
| * current branch. |
| */ |
| branch = branch_to_free = resolve_refdup("HEAD", 0, &head_oid, NULL); |
| if (branch) |
| skip_prefix(branch, "refs/heads/", &branch); |
| |
| init_diff_ui_defaults(); |
| git_config(git_merge_config, NULL); |
| |
| if (!branch || is_null_oid(&head_oid)) |
| head_commit = NULL; |
| else |
| head_commit = lookup_commit_or_die(&head_oid, "HEAD"); |
| |
| if (branch_mergeoptions) |
| parse_branch_merge_options(branch_mergeoptions); |
| argc = parse_options(argc, argv, prefix, builtin_merge_options, |
| builtin_merge_usage, 0); |
| if (shortlog_len < 0) |
| shortlog_len = (merge_log_config > 0) ? merge_log_config : 0; |
| |
| if (verbosity < 0 && show_progress == -1) |
| show_progress = 0; |
| |
| if (abort_current_merge) { |
| int nargc = 2; |
| const char *nargv[] = {"reset", "--merge", NULL}; |
| struct strbuf stash_oid = STRBUF_INIT; |
| |
| if (orig_argc != 2) |
| usage_msg_opt(_("--abort expects no arguments"), |
| builtin_merge_usage, builtin_merge_options); |
| |
| if (!file_exists(git_path_merge_head(the_repository))) |
| die(_("There is no merge to abort (MERGE_HEAD missing).")); |
| |
| if (read_oneliner(&stash_oid, git_path_merge_autostash(the_repository), |
| READ_ONELINER_SKIP_IF_EMPTY)) |
| unlink(git_path_merge_autostash(the_repository)); |
| |
| /* Invoke 'git reset --merge' */ |
| ret = cmd_reset(nargc, nargv, prefix); |
| |
| if (stash_oid.len) |
| apply_autostash_oid(stash_oid.buf); |
| |
| strbuf_release(&stash_oid); |
| goto done; |
| } |
| |
| if (quit_current_merge) { |
| if (orig_argc != 2) |
| usage_msg_opt(_("--quit expects no arguments"), |
| builtin_merge_usage, |
| builtin_merge_options); |
| |
| remove_merge_branch_state(the_repository); |
| goto done; |
| } |
| |
| if (continue_current_merge) { |
| int nargc = 1; |
| const char *nargv[] = {"commit", NULL}; |
| |
| if (orig_argc != 2) |
| usage_msg_opt(_("--continue expects no arguments"), |
| builtin_merge_usage, builtin_merge_options); |
| |
| if (!file_exists(git_path_merge_head(the_repository))) |
| die(_("There is no merge in progress (MERGE_HEAD missing).")); |
| |
| /* Invoke 'git commit' */ |
| ret = cmd_commit(nargc, nargv, prefix); |
| goto done; |
| } |
| |
| if (read_cache_unmerged()) |
| die_resolve_conflict("merge"); |
| |
| if (file_exists(git_path_merge_head(the_repository))) { |
| /* |
| * There is no unmerged entry, don't advise 'git |
| * add/rm <file>', just 'git commit'. |
| */ |
| if (advice_resolve_conflict) |
| die(_("You have not concluded your merge (MERGE_HEAD exists).\n" |
| "Please, commit your changes before you merge.")); |
| else |
| die(_("You have not concluded your merge (MERGE_HEAD exists).")); |
| } |
| if (file_exists(git_path_cherry_pick_head(the_repository))) { |
| if (advice_resolve_conflict) |
| die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists).\n" |
| "Please, commit your changes before you merge.")); |
| else |
| die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists).")); |
| } |
| resolve_undo_clear(); |
| |
| if (option_edit < 0) |
| option_edit = default_edit_option(); |
| |
| cleanup_mode = get_cleanup_mode(cleanup_arg, 0 < option_edit); |
| |
| if (verbosity < 0) |
| show_diffstat = 0; |
| |
| if (squash) { |
| if (fast_forward == FF_NO) |
| die(_("You cannot combine --squash with --no-ff.")); |
| if (option_commit > 0) |
| die(_("You cannot combine --squash with --commit.")); |
| /* |
| * squash can now silently disable option_commit - this is not |
| * a problem as it is only overriding the default, not a user |
| * supplied option. |
| */ |
| option_commit = 0; |
| } |
| |
| if (option_commit < 0) |
| option_commit = 1; |
| |
| if (!argc) { |
| if (default_to_upstream) |
| argc = setup_with_upstream(&argv); |
| else |
| die(_("No commit specified and merge.defaultToUpstream not set.")); |
| } else if (argc == 1 && !strcmp(argv[0], "-")) { |
| argv[0] = "@{-1}"; |
| } |
| |
| if (!argc) |
| usage_with_options(builtin_merge_usage, |
| builtin_merge_options); |
| |
| if (!head_commit) { |
| /* |
| * If the merged head is a valid one there is no reason |
| * to forbid "git merge" into a branch yet to be born. |
| * We do the same for "git pull". |
| */ |
| struct object_id *remote_head_oid; |
| if (squash) |
| die(_("Squash commit into empty head not supported yet")); |
| if (fast_forward == FF_NO) |
| die(_("Non-fast-forward commit does not make sense into " |
| "an empty head")); |
| remoteheads = collect_parents(head_commit, &head_subsumed, |
| argc, argv, NULL); |
| if (!remoteheads) |
| die(_("%s - not something we can merge"), argv[0]); |
| if (remoteheads->next) |
| die(_("Can merge only exactly one commit into empty head")); |
| |
| if (verify_signatures) |
| verify_merge_signature(remoteheads->item, verbosity, |
| check_trust_level); |
| |
| remote_head_oid = &remoteheads->item->object.oid; |
| read_empty(remote_head_oid, 0); |
| update_ref("initial pull", "HEAD", remote_head_oid, NULL, 0, |
| UPDATE_REFS_DIE_ON_ERR); |
| goto done; |
| } |
| |
| /* |
| * All the rest are the commits being merged; prepare |
| * the standard merge summary message to be appended |
| * to the given message. |
| */ |
| remoteheads = collect_parents(head_commit, &head_subsumed, |
| argc, argv, &merge_msg); |
| |
| if (!head_commit || !argc) |
| usage_with_options(builtin_merge_usage, |
| builtin_merge_options); |
| |
| if (verify_signatures) { |
| for (p = remoteheads; p; p = p->next) { |
| verify_merge_signature(p->item, verbosity, |
| check_trust_level); |
| } |
| } |
| |
| strbuf_addstr(&buf, "merge"); |
| for (p = remoteheads; p; p = p->next) |
| strbuf_addf(&buf, " %s", merge_remote_util(p->item)->name); |
| setenv("GIT_REFLOG_ACTION", buf.buf, 0); |
| strbuf_reset(&buf); |
| |
| for (p = remoteheads; p; p = p->next) { |
| struct commit *commit = p->item; |
| strbuf_addf(&buf, "GITHEAD_%s", |
| oid_to_hex(&commit->object.oid)); |
| setenv(buf.buf, merge_remote_util(commit)->name, 1); |
| strbuf_reset(&buf); |
| if (fast_forward != FF_ONLY && merging_a_throwaway_tag(commit)) |
| fast_forward = FF_NO; |
| } |
| |
| if (!use_strategies) { |
| if (!remoteheads) |
| ; /* already up-to-date */ |
| else if (!remoteheads->next) |
| add_strategies(pull_twohead, DEFAULT_TWOHEAD); |
| else |
| add_strategies(pull_octopus, DEFAULT_OCTOPUS); |
| } |
| |
| for (i = 0; i < use_strategies_nr; i++) { |
| if (use_strategies[i]->attr & NO_FAST_FORWARD) |
| fast_forward = FF_NO; |
| if (use_strategies[i]->attr & NO_TRIVIAL) |
| allow_trivial = 0; |
| } |
| |
| if (!remoteheads) |
| ; /* already up-to-date */ |
| else if (!remoteheads->next) |
| common = get_merge_bases(head_commit, remoteheads->item); |
| else { |
| struct commit_list *list = remoteheads; |
| commit_list_insert(head_commit, &list); |
| common = get_octopus_merge_bases(list); |
| free(list); |
| } |
| |
| update_ref("updating ORIG_HEAD", "ORIG_HEAD", |
| &head_commit->object.oid, NULL, 0, UPDATE_REFS_DIE_ON_ERR); |
| |
| if (remoteheads && !common) { |
| /* No common ancestors found. */ |
| if (!allow_unrelated_histories) |
| die(_("refusing to merge unrelated histories")); |
| /* otherwise, we need a real merge. */ |
| } else if (!remoteheads || |
| (!remoteheads->next && !common->next && |
| common->item == remoteheads->item)) { |
| /* |
| * If head can reach all the merge then we are up to date. |
| * but first the most common case of merging one remote. |
| */ |
| finish_up_to_date(_("Already up to date.")); |
| goto done; |
| } else if (fast_forward != FF_NO && !remoteheads->next && |
| !common->next && |
| oideq(&common->item->object.oid, &head_commit->object.oid)) { |
| /* Again the most common case of merging one remote. */ |
| struct strbuf msg = STRBUF_INIT; |
| struct commit *commit; |
| |
| if (verbosity >= 0) { |
| printf(_("Updating %s..%s\n"), |
| find_unique_abbrev(&head_commit->object.oid, |
| DEFAULT_ABBREV), |
| find_unique_abbrev(&remoteheads->item->object.oid, |
| DEFAULT_ABBREV)); |
| } |
| strbuf_addstr(&msg, "Fast-forward"); |
| if (have_message) |
| strbuf_addstr(&msg, |
| " (no commit created; -m option ignored)"); |
| commit = remoteheads->item; |
| if (!commit) { |
| ret = 1; |
| goto done; |
| } |
| |
| if (autostash) |
| create_autostash(the_repository, |
| git_path_merge_autostash(the_repository), |
| "merge"); |
| if (checkout_fast_forward(the_repository, |
| &head_commit->object.oid, |
| &commit->object.oid, |
| overwrite_ignore)) { |
| ret = 1; |
| goto done; |
| } |
| |
| finish(head_commit, remoteheads, &commit->object.oid, msg.buf); |
| remove_merge_branch_state(the_repository); |
| goto done; |
| } else if (!remoteheads->next && common->next) |
| ; |
| /* |
| * We are not doing octopus and not fast-forward. Need |
| * a real merge. |
| */ |
| else if (!remoteheads->next && !common->next && option_commit) { |
| /* |
| * We are not doing octopus, not fast-forward, and have |
| * only one common. |
| */ |
| refresh_cache(REFRESH_QUIET); |
| if (allow_trivial && fast_forward != FF_ONLY) { |
| /* See if it is really trivial. */ |
| git_committer_info(IDENT_STRICT); |
| printf(_("Trying really trivial in-index merge...\n")); |
| if (!read_tree_trivial(&common->item->object.oid, |
| &head_commit->object.oid, |
| &remoteheads->item->object.oid)) { |
| ret = merge_trivial(head_commit, remoteheads); |
| goto done; |
| } |
| printf(_("Nope.\n")); |
| } |
| } else { |
| /* |
| * An octopus. If we can reach all the remote we are up |
| * to date. |
| */ |
| int up_to_date = 1; |
| struct commit_list *j; |
| |
| for (j = remoteheads; j; j = j->next) { |
| struct commit_list *common_one; |
| |
| /* |
| * Here we *have* to calculate the individual |
| * merge_bases again, otherwise "git merge HEAD^ |
| * HEAD^^" would be missed. |
| */ |
| common_one = get_merge_bases(head_commit, j->item); |
| if (!oideq(&common_one->item->object.oid, &j->item->object.oid)) { |
| up_to_date = 0; |
| break; |
| } |
| } |
| if (up_to_date) { |
| finish_up_to_date(_("Already up to date. Yeeah!")); |
| goto done; |
| } |
| } |
| |
| if (fast_forward == FF_ONLY) |
| die(_("Not possible to fast-forward, aborting.")); |
| |
| if (autostash) |
| create_autostash(the_repository, |
| git_path_merge_autostash(the_repository), |
| "merge"); |
| |
| /* We are going to make a new commit. */ |
| git_committer_info(IDENT_STRICT); |
| |
| /* |
| * At this point, we need a real merge. No matter what strategy |
| * we use, it would operate on the index, possibly affecting the |
| * working tree, and when resolved cleanly, have the desired |
| * tree in the index -- this means that the index must be in |
| * sync with the head commit. The strategies are responsible |
| * to ensure this. |
| */ |
| if (use_strategies_nr == 1 || |
| /* |
| * Stash away the local changes so that we can try more than one. |
| */ |
| save_state(&stash)) |
| oidclr(&stash); |
| |
| for (i = 0; !merge_was_ok && i < use_strategies_nr; i++) { |
| int ret, cnt; |
| if (i) { |
| printf(_("Rewinding the tree to pristine...\n")); |
| restore_state(&head_commit->object.oid, &stash); |
| } |
| if (use_strategies_nr != 1) |
| printf(_("Trying merge strategy %s...\n"), |
| use_strategies[i]->name); |
| /* |
| * Remember which strategy left the state in the working |
| * tree. |
| */ |
| wt_strategy = use_strategies[i]->name; |
| |
| ret = try_merge_strategy(use_strategies[i]->name, |
| common, remoteheads, |
| head_commit); |
| /* |
| * The backend exits with 1 when conflicts are |
| * left to be resolved, with 2 when it does not |
| * handle the given merge at all. |
| */ |
| if (ret < 2) { |
| if (!ret) { |
| if (option_commit) { |
| /* Automerge succeeded. */ |
| automerge_was_ok = 1; |
| break; |
| } |
| merge_was_ok = 1; |
| } |
| cnt = evaluate_result(); |
| if (best_cnt <= 0 || cnt <= best_cnt) { |
| best_strategy = use_strategies[i]->name; |
| best_cnt = cnt; |
| } |
| } |
| } |
| |
| /* |
| * If we have a resulting tree, that means the strategy module |
| * auto resolved the merge cleanly. |
| */ |
| if (automerge_was_ok) { |
| ret = finish_automerge(head_commit, head_subsumed, |
| common, remoteheads, |
| &result_tree, wt_strategy); |
| goto done; |
| } |
| |
| /* |
| * Pick the result from the best strategy and have the user fix |
| * it up. |
| */ |
| if (!best_strategy) { |
| restore_state(&head_commit->object.oid, &stash); |
| if (use_strategies_nr > 1) |
| fprintf(stderr, |
| _("No merge strategy handled the merge.\n")); |
| else |
| fprintf(stderr, _("Merge with strategy %s failed.\n"), |
| use_strategies[0]->name); |
| ret = 2; |
| goto done; |
| } else if (best_strategy == wt_strategy) |
| ; /* We already have its result in the working tree. */ |
| else { |
| printf(_("Rewinding the tree to pristine...\n")); |
| restore_state(&head_commit->object.oid, &stash); |
| printf(_("Using the %s to prepare resolving by hand.\n"), |
| best_strategy); |
| try_merge_strategy(best_strategy, common, remoteheads, |
| head_commit); |
| } |
| |
| if (squash) { |
| finish(head_commit, remoteheads, NULL, NULL); |
| |
| git_test_write_commit_graph_or_die(); |
| } else |
| write_merge_state(remoteheads); |
| |
| if (merge_was_ok) |
| fprintf(stderr, _("Automatic merge went well; " |
| "stopped before committing as requested\n")); |
| else |
| ret = suggest_conflicts(); |
| |
| done: |
| free(branch_to_free); |
| return ret; |
| } |