| /* |
| * Builtin "git pull" |
| * |
| * Based on git-pull.sh by Junio C Hamano |
| * |
| * Fetch one or more remote refs and merge it/them into the current HEAD. |
| */ |
| #define USE_THE_INDEX_VARIABLE |
| #include "builtin.h" |
| #include "advice.h" |
| #include "config.h" |
| #include "gettext.h" |
| #include "hex.h" |
| #include "merge.h" |
| #include "object-name.h" |
| #include "parse-options.h" |
| #include "run-command.h" |
| #include "oid-array.h" |
| #include "remote.h" |
| #include "dir.h" |
| #include "path.h" |
| #include "read-cache-ll.h" |
| #include "rebase.h" |
| #include "refs.h" |
| #include "refspec.h" |
| #include "submodule.h" |
| #include "submodule-config.h" |
| #include "wt-status.h" |
| #include "commit-reach.h" |
| #include "sequencer.h" |
| |
| /** |
| * Parses the value of --rebase. If value is a false value, returns |
| * REBASE_FALSE. If value is a true value, returns REBASE_TRUE. If value is |
| * "merges", returns REBASE_MERGES. If value is a invalid value, dies with |
| * a fatal error if fatal is true, otherwise returns REBASE_INVALID. |
| */ |
| static enum rebase_type parse_config_rebase(const char *key, const char *value, |
| int fatal) |
| { |
| enum rebase_type v = rebase_parse_value(value); |
| if (v != REBASE_INVALID) |
| return v; |
| |
| if (fatal) |
| die(_("invalid value for '%s': '%s'"), key, value); |
| else |
| error(_("invalid value for '%s': '%s'"), key, value); |
| |
| return REBASE_INVALID; |
| } |
| |
| /** |
| * Callback for --rebase, which parses arg with parse_config_rebase(). |
| */ |
| static int parse_opt_rebase(const struct option *opt, const char *arg, int unset) |
| { |
| enum rebase_type *value = opt->value; |
| |
| if (arg) |
| *value = parse_config_rebase("--rebase", arg, 0); |
| else |
| *value = unset ? REBASE_FALSE : REBASE_TRUE; |
| return *value == REBASE_INVALID ? -1 : 0; |
| } |
| |
| static const char * const pull_usage[] = { |
| N_("git pull [<options>] [<repository> [<refspec>...]]"), |
| NULL |
| }; |
| |
| /* Shared options */ |
| static int opt_verbosity; |
| static char *opt_progress; |
| static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT; |
| static int recurse_submodules_cli = RECURSE_SUBMODULES_DEFAULT; |
| |
| /* Options passed to git-merge or git-rebase */ |
| static enum rebase_type opt_rebase = -1; |
| static char *opt_diffstat; |
| static char *opt_log; |
| static char *opt_signoff; |
| static char *opt_squash; |
| static char *opt_commit; |
| static char *opt_edit; |
| static char *cleanup_arg; |
| static char *opt_ff; |
| static char *opt_verify_signatures; |
| static char *opt_verify; |
| static int opt_autostash = -1; |
| static int config_autostash; |
| static int check_trust_level = 1; |
| static struct strvec opt_strategies = STRVEC_INIT; |
| static struct strvec opt_strategy_opts = STRVEC_INIT; |
| static char *opt_gpg_sign; |
| static int opt_allow_unrelated_histories; |
| |
| /* Options passed to git-fetch */ |
| static char *opt_all; |
| static char *opt_append; |
| static char *opt_upload_pack; |
| static int opt_force; |
| static char *opt_tags; |
| static char *opt_prune; |
| static char *max_children; |
| static int opt_dry_run; |
| static char *opt_keep; |
| static char *opt_depth; |
| static char *opt_unshallow; |
| static char *opt_update_shallow; |
| static char *opt_refmap; |
| static char *opt_ipv4; |
| static char *opt_ipv6; |
| static int opt_show_forced_updates = -1; |
| static char *set_upstream; |
| static struct strvec opt_fetch = STRVEC_INIT; |
| |
| static struct option pull_options[] = { |
| /* Shared options */ |
| OPT__VERBOSITY(&opt_verbosity), |
| OPT_PASSTHRU(0, "progress", &opt_progress, NULL, |
| N_("force progress reporting"), |
| PARSE_OPT_NOARG), |
| OPT_CALLBACK_F(0, "recurse-submodules", |
| &recurse_submodules_cli, N_("on-demand"), |
| N_("control for recursive fetching of submodules"), |
| PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules), |
| |
| /* Options passed to git-merge or git-rebase */ |
| OPT_GROUP(N_("Options related to merging")), |
| OPT_CALLBACK_F('r', "rebase", &opt_rebase, |
| "(false|true|merges|interactive)", |
| N_("incorporate changes by rebasing rather than merging"), |
| PARSE_OPT_OPTARG, parse_opt_rebase), |
| OPT_PASSTHRU('n', NULL, &opt_diffstat, NULL, |
| N_("do not show a diffstat at the end of the merge"), |
| PARSE_OPT_NOARG | PARSE_OPT_NONEG), |
| OPT_PASSTHRU(0, "stat", &opt_diffstat, NULL, |
| N_("show a diffstat at the end of the merge"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "summary", &opt_diffstat, NULL, |
| N_("(synonym to --stat)"), |
| PARSE_OPT_NOARG | PARSE_OPT_HIDDEN), |
| OPT_PASSTHRU(0, "log", &opt_log, N_("n"), |
| N_("add (at most <n>) entries from shortlog to merge commit message"), |
| PARSE_OPT_OPTARG), |
| OPT_PASSTHRU(0, "signoff", &opt_signoff, NULL, |
| N_("add a Signed-off-by trailer"), |
| PARSE_OPT_OPTARG), |
| OPT_PASSTHRU(0, "squash", &opt_squash, NULL, |
| N_("create a single commit instead of doing a merge"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "commit", &opt_commit, NULL, |
| N_("perform a commit if the merge succeeds (default)"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "edit", &opt_edit, NULL, |
| N_("edit message before committing"), |
| PARSE_OPT_NOARG), |
| OPT_CLEANUP(&cleanup_arg), |
| OPT_PASSTHRU(0, "ff", &opt_ff, NULL, |
| N_("allow fast-forward"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "ff-only", &opt_ff, NULL, |
| N_("abort if fast-forward is not possible"), |
| PARSE_OPT_NOARG | PARSE_OPT_NONEG), |
| OPT_PASSTHRU(0, "verify", &opt_verify, NULL, |
| N_("control use of pre-merge-commit and commit-msg hooks"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "verify-signatures", &opt_verify_signatures, NULL, |
| N_("verify that the named commit has a valid GPG signature"), |
| PARSE_OPT_NOARG), |
| OPT_BOOL(0, "autostash", &opt_autostash, |
| N_("automatically stash/stash pop before and after")), |
| OPT_PASSTHRU_ARGV('s', "strategy", &opt_strategies, N_("strategy"), |
| N_("merge strategy to use"), |
| 0), |
| OPT_PASSTHRU_ARGV('X', "strategy-option", &opt_strategy_opts, |
| N_("option=value"), |
| N_("option for selected merge strategy"), |
| 0), |
| OPT_PASSTHRU('S', "gpg-sign", &opt_gpg_sign, N_("key-id"), |
| N_("GPG sign commit"), |
| PARSE_OPT_OPTARG), |
| OPT_SET_INT(0, "allow-unrelated-histories", |
| &opt_allow_unrelated_histories, |
| N_("allow merging unrelated histories"), 1), |
| |
| /* Options passed to git-fetch */ |
| OPT_GROUP(N_("Options related to fetching")), |
| OPT_PASSTHRU(0, "all", &opt_all, NULL, |
| N_("fetch from all remotes"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU('a', "append", &opt_append, NULL, |
| N_("append to .git/FETCH_HEAD instead of overwriting"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "upload-pack", &opt_upload_pack, N_("path"), |
| N_("path to upload pack on remote end"), |
| 0), |
| OPT__FORCE(&opt_force, N_("force overwrite of local branch"), 0), |
| OPT_PASSTHRU('t', "tags", &opt_tags, NULL, |
| N_("fetch all tags and associated objects"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU('p', "prune", &opt_prune, NULL, |
| N_("prune remote-tracking branches no longer on remote"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU('j', "jobs", &max_children, N_("n"), |
| N_("number of submodules pulled in parallel"), |
| PARSE_OPT_OPTARG), |
| OPT_BOOL(0, "dry-run", &opt_dry_run, |
| N_("dry run")), |
| OPT_PASSTHRU('k', "keep", &opt_keep, NULL, |
| N_("keep downloaded pack"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "depth", &opt_depth, N_("depth"), |
| N_("deepen history of shallow clone"), |
| 0), |
| OPT_PASSTHRU_ARGV(0, "shallow-since", &opt_fetch, N_("time"), |
| N_("deepen history of shallow repository based on time"), |
| 0), |
| OPT_PASSTHRU_ARGV(0, "shallow-exclude", &opt_fetch, N_("revision"), |
| N_("deepen history of shallow clone, excluding rev"), |
| 0), |
| OPT_PASSTHRU_ARGV(0, "deepen", &opt_fetch, N_("n"), |
| N_("deepen history of shallow clone"), |
| 0), |
| OPT_PASSTHRU(0, "unshallow", &opt_unshallow, NULL, |
| N_("convert to a complete repository"), |
| PARSE_OPT_NONEG | PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "update-shallow", &opt_update_shallow, NULL, |
| N_("accept refs that update .git/shallow"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU(0, "refmap", &opt_refmap, N_("refmap"), |
| N_("specify fetch refmap"), |
| PARSE_OPT_NONEG), |
| OPT_PASSTHRU_ARGV('o', "server-option", &opt_fetch, |
| N_("server-specific"), |
| N_("option to transmit"), |
| 0), |
| OPT_PASSTHRU('4', "ipv4", &opt_ipv4, NULL, |
| N_("use IPv4 addresses only"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU('6', "ipv6", &opt_ipv6, NULL, |
| N_("use IPv6 addresses only"), |
| PARSE_OPT_NOARG), |
| OPT_PASSTHRU_ARGV(0, "negotiation-tip", &opt_fetch, N_("revision"), |
| N_("report that we have only objects reachable from this object"), |
| 0), |
| OPT_BOOL(0, "show-forced-updates", &opt_show_forced_updates, |
| N_("check for forced-updates on all updated branches")), |
| OPT_PASSTHRU(0, "set-upstream", &set_upstream, NULL, |
| N_("set upstream for git pull/fetch"), |
| PARSE_OPT_NOARG), |
| |
| OPT_END() |
| }; |
| |
| /** |
| * Pushes "-q" or "-v" switches into arr to match the opt_verbosity level. |
| */ |
| static void argv_push_verbosity(struct strvec *arr) |
| { |
| int verbosity; |
| |
| for (verbosity = opt_verbosity; verbosity > 0; verbosity--) |
| strvec_push(arr, "-v"); |
| |
| for (verbosity = opt_verbosity; verbosity < 0; verbosity++) |
| strvec_push(arr, "-q"); |
| } |
| |
| /** |
| * Pushes "-f" switches into arr to match the opt_force level. |
| */ |
| static void argv_push_force(struct strvec *arr) |
| { |
| int force = opt_force; |
| while (force-- > 0) |
| strvec_push(arr, "-f"); |
| } |
| |
| /** |
| * Sets the GIT_REFLOG_ACTION environment variable to the concatenation of argv |
| */ |
| static void set_reflog_message(int argc, const char **argv) |
| { |
| int i; |
| struct strbuf msg = STRBUF_INIT; |
| |
| for (i = 0; i < argc; i++) { |
| if (i) |
| strbuf_addch(&msg, ' '); |
| strbuf_addstr(&msg, argv[i]); |
| } |
| |
| setenv("GIT_REFLOG_ACTION", msg.buf, 0); |
| |
| strbuf_release(&msg); |
| } |
| |
| /** |
| * If pull.ff is unset, returns NULL. If pull.ff is "true", returns "--ff". If |
| * pull.ff is "false", returns "--no-ff". If pull.ff is "only", returns |
| * "--ff-only". Otherwise, if pull.ff is set to an invalid value, die with an |
| * error. |
| */ |
| static const char *config_get_ff(void) |
| { |
| const char *value; |
| |
| if (git_config_get_value("pull.ff", &value)) |
| return NULL; |
| |
| switch (git_parse_maybe_bool(value)) { |
| case 0: |
| return "--no-ff"; |
| case 1: |
| return "--ff"; |
| } |
| |
| if (!strcmp(value, "only")) |
| return "--ff-only"; |
| |
| die(_("invalid value for '%s': '%s'"), "pull.ff", value); |
| } |
| |
| /** |
| * Returns the default configured value for --rebase. It first looks for the |
| * value of "branch.$curr_branch.rebase", where $curr_branch is the current |
| * branch, and if HEAD is detached or the configuration key does not exist, |
| * looks for the value of "pull.rebase". If both configuration keys do not |
| * exist, returns REBASE_FALSE. |
| */ |
| static enum rebase_type config_get_rebase(int *rebase_unspecified) |
| { |
| struct branch *curr_branch = branch_get("HEAD"); |
| const char *value; |
| |
| if (curr_branch) { |
| char *key = xstrfmt("branch.%s.rebase", curr_branch->name); |
| |
| if (!git_config_get_value(key, &value)) { |
| enum rebase_type ret = parse_config_rebase(key, value, 1); |
| free(key); |
| return ret; |
| } |
| |
| free(key); |
| } |
| |
| if (!git_config_get_value("pull.rebase", &value)) |
| return parse_config_rebase("pull.rebase", value, 1); |
| |
| *rebase_unspecified = 1; |
| |
| return REBASE_FALSE; |
| } |
| |
| /** |
| * Read config variables. |
| */ |
| static int git_pull_config(const char *var, const char *value, |
| const struct config_context *ctx, void *cb) |
| { |
| if (!strcmp(var, "rebase.autostash")) { |
| config_autostash = git_config_bool(var, value); |
| return 0; |
| } else if (!strcmp(var, "submodule.recurse")) { |
| recurse_submodules = git_config_bool(var, value) ? |
| RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF; |
| return 0; |
| } else if (!strcmp(var, "gpg.mintrustlevel")) { |
| check_trust_level = 0; |
| } |
| |
| return git_default_config(var, value, ctx, cb); |
| } |
| |
| /** |
| * Appends merge candidates from FETCH_HEAD that are not marked not-for-merge |
| * into merge_heads. |
| */ |
| static void get_merge_heads(struct oid_array *merge_heads) |
| { |
| const char *filename = git_path_fetch_head(the_repository); |
| FILE *fp; |
| struct strbuf sb = STRBUF_INIT; |
| struct object_id oid; |
| |
| fp = xfopen(filename, "r"); |
| while (strbuf_getline_lf(&sb, fp) != EOF) { |
| const char *p; |
| if (parse_oid_hex(sb.buf, &oid, &p)) |
| continue; /* invalid line: does not start with object ID */ |
| if (starts_with(p, "\tnot-for-merge\t")) |
| continue; /* ref is not-for-merge */ |
| oid_array_append(merge_heads, &oid); |
| } |
| fclose(fp); |
| strbuf_release(&sb); |
| } |
| |
| /** |
| * Used by die_no_merge_candidates() as a for_each_remote() callback to |
| * retrieve the name of the remote if the repository only has one remote. |
| */ |
| static int get_only_remote(struct remote *remote, void *cb_data) |
| { |
| const char **remote_name = cb_data; |
| |
| if (*remote_name) |
| return -1; |
| |
| *remote_name = remote->name; |
| return 0; |
| } |
| |
| /** |
| * Dies with the appropriate reason for why there are no merge candidates: |
| * |
| * 1. We fetched from a specific remote, and a refspec was given, but it ended |
| * up not fetching anything. This is usually because the user provided a |
| * wildcard refspec which had no matches on the remote end. |
| * |
| * 2. We fetched from a non-default remote, but didn't specify a branch to |
| * merge. We can't use the configured one because it applies to the default |
| * remote, thus the user must specify the branches to merge. |
| * |
| * 3. We fetched from the branch's or repo's default remote, but: |
| * |
| * a. We are not on a branch, so there will never be a configured branch to |
| * merge with. |
| * |
| * b. We are on a branch, but there is no configured branch to merge with. |
| * |
| * 4. We fetched from the branch's or repo's default remote, but the configured |
| * branch to merge didn't get fetched. (Either it doesn't exist, or wasn't |
| * part of the configured fetch refspec.) |
| */ |
| static void NORETURN die_no_merge_candidates(const char *repo, const char **refspecs) |
| { |
| struct branch *curr_branch = branch_get("HEAD"); |
| const char *remote = curr_branch ? curr_branch->remote_name : NULL; |
| |
| if (*refspecs) { |
| if (opt_rebase) |
| fprintf_ln(stderr, _("There is no candidate for rebasing against among the refs that you just fetched.")); |
| else |
| fprintf_ln(stderr, _("There are no candidates for merging among the refs that you just fetched.")); |
| fprintf_ln(stderr, _("Generally this means that you provided a wildcard refspec which had no\n" |
| "matches on the remote end.")); |
| } else if (repo && curr_branch && (!remote || strcmp(repo, remote))) { |
| fprintf_ln(stderr, _("You asked to pull from the remote '%s', but did not specify\n" |
| "a branch. Because this is not the default configured remote\n" |
| "for your current branch, you must specify a branch on the command line."), |
| repo); |
| } else if (!curr_branch) { |
| fprintf_ln(stderr, _("You are not currently on a branch.")); |
| if (opt_rebase) |
| fprintf_ln(stderr, _("Please specify which branch you want to rebase against.")); |
| else |
| fprintf_ln(stderr, _("Please specify which branch you want to merge with.")); |
| fprintf_ln(stderr, _("See git-pull(1) for details.")); |
| fprintf(stderr, "\n"); |
| fprintf_ln(stderr, " git pull %s %s", _("<remote>"), _("<branch>")); |
| fprintf(stderr, "\n"); |
| } else if (!curr_branch->merge_nr) { |
| const char *remote_name = NULL; |
| |
| if (for_each_remote(get_only_remote, &remote_name) || !remote_name) |
| remote_name = _("<remote>"); |
| |
| fprintf_ln(stderr, _("There is no tracking information for the current branch.")); |
| if (opt_rebase) |
| fprintf_ln(stderr, _("Please specify which branch you want to rebase against.")); |
| else |
| fprintf_ln(stderr, _("Please specify which branch you want to merge with.")); |
| fprintf_ln(stderr, _("See git-pull(1) for details.")); |
| fprintf(stderr, "\n"); |
| fprintf_ln(stderr, " git pull %s %s", _("<remote>"), _("<branch>")); |
| fprintf(stderr, "\n"); |
| fprintf_ln(stderr, _("If you wish to set tracking information for this branch you can do so with:")); |
| fprintf(stderr, "\n"); |
| fprintf_ln(stderr, " git branch --set-upstream-to=%s/%s %s\n", |
| remote_name, _("<branch>"), curr_branch->name); |
| } else |
| fprintf_ln(stderr, _("Your configuration specifies to merge with the ref '%s'\n" |
| "from the remote, but no such ref was fetched."), |
| *curr_branch->merge_name); |
| exit(1); |
| } |
| |
| /** |
| * Parses argv into [<repo> [<refspecs>...]], returning their values in `repo` |
| * as a string and `refspecs` as a null-terminated array of strings. If `repo` |
| * is not provided in argv, it is set to NULL. |
| */ |
| static void parse_repo_refspecs(int argc, const char **argv, const char **repo, |
| const char ***refspecs) |
| { |
| if (argc > 0) { |
| *repo = *argv++; |
| argc--; |
| } else |
| *repo = NULL; |
| *refspecs = argv; |
| } |
| |
| /** |
| * Runs git-fetch, returning its exit status. `repo` and `refspecs` are the |
| * repository and refspecs to fetch, or NULL if they are not provided. |
| */ |
| static int run_fetch(const char *repo, const char **refspecs) |
| { |
| struct child_process cmd = CHILD_PROCESS_INIT; |
| |
| strvec_pushl(&cmd.args, "fetch", "--update-head-ok", NULL); |
| |
| /* Shared options */ |
| argv_push_verbosity(&cmd.args); |
| if (opt_progress) |
| strvec_push(&cmd.args, opt_progress); |
| |
| /* Options passed to git-fetch */ |
| if (opt_all) |
| strvec_push(&cmd.args, opt_all); |
| if (opt_append) |
| strvec_push(&cmd.args, opt_append); |
| if (opt_upload_pack) |
| strvec_push(&cmd.args, opt_upload_pack); |
| argv_push_force(&cmd.args); |
| if (opt_tags) |
| strvec_push(&cmd.args, opt_tags); |
| if (opt_prune) |
| strvec_push(&cmd.args, opt_prune); |
| if (recurse_submodules_cli != RECURSE_SUBMODULES_DEFAULT) |
| switch (recurse_submodules_cli) { |
| case RECURSE_SUBMODULES_ON: |
| strvec_push(&cmd.args, "--recurse-submodules=on"); |
| break; |
| case RECURSE_SUBMODULES_OFF: |
| strvec_push(&cmd.args, "--recurse-submodules=no"); |
| break; |
| case RECURSE_SUBMODULES_ON_DEMAND: |
| strvec_push(&cmd.args, "--recurse-submodules=on-demand"); |
| break; |
| default: |
| BUG("submodule recursion option not understood"); |
| } |
| if (max_children) |
| strvec_push(&cmd.args, max_children); |
| if (opt_dry_run) |
| strvec_push(&cmd.args, "--dry-run"); |
| if (opt_keep) |
| strvec_push(&cmd.args, opt_keep); |
| if (opt_depth) |
| strvec_push(&cmd.args, opt_depth); |
| if (opt_unshallow) |
| strvec_push(&cmd.args, opt_unshallow); |
| if (opt_update_shallow) |
| strvec_push(&cmd.args, opt_update_shallow); |
| if (opt_refmap) |
| strvec_push(&cmd.args, opt_refmap); |
| if (opt_ipv4) |
| strvec_push(&cmd.args, opt_ipv4); |
| if (opt_ipv6) |
| strvec_push(&cmd.args, opt_ipv6); |
| if (opt_show_forced_updates > 0) |
| strvec_push(&cmd.args, "--show-forced-updates"); |
| else if (opt_show_forced_updates == 0) |
| strvec_push(&cmd.args, "--no-show-forced-updates"); |
| if (set_upstream) |
| strvec_push(&cmd.args, set_upstream); |
| strvec_pushv(&cmd.args, opt_fetch.v); |
| |
| if (repo) { |
| strvec_push(&cmd.args, repo); |
| strvec_pushv(&cmd.args, refspecs); |
| } else if (*refspecs) |
| BUG("refspecs without repo?"); |
| cmd.git_cmd = 1; |
| cmd.close_object_store = 1; |
| return run_command(&cmd); |
| } |
| |
| /** |
| * "Pulls into void" by branching off merge_head. |
| */ |
| static int pull_into_void(const struct object_id *merge_head, |
| const struct object_id *curr_head) |
| { |
| if (opt_verify_signatures) { |
| struct commit *commit; |
| |
| commit = lookup_commit(the_repository, merge_head); |
| if (!commit) |
| die(_("unable to access commit %s"), |
| oid_to_hex(merge_head)); |
| |
| verify_merge_signature(commit, opt_verbosity, |
| check_trust_level); |
| } |
| |
| /* |
| * Two-way merge: we treat the index as based on an empty tree, |
| * and try to fast-forward to HEAD. This ensures we will not lose |
| * index/worktree changes that the user already made on the unborn |
| * branch. |
| */ |
| if (checkout_fast_forward(the_repository, |
| the_hash_algo->empty_tree, |
| merge_head, 0)) |
| return 1; |
| |
| if (update_ref("initial pull", "HEAD", merge_head, curr_head, 0, UPDATE_REFS_DIE_ON_ERR)) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int rebase_submodules(void) |
| { |
| struct child_process cp = CHILD_PROCESS_INIT; |
| |
| cp.git_cmd = 1; |
| cp.no_stdin = 1; |
| strvec_pushl(&cp.args, "submodule", "update", |
| "--recursive", "--rebase", NULL); |
| argv_push_verbosity(&cp.args); |
| |
| return run_command(&cp); |
| } |
| |
| static int update_submodules(void) |
| { |
| struct child_process cp = CHILD_PROCESS_INIT; |
| |
| cp.git_cmd = 1; |
| cp.no_stdin = 1; |
| strvec_pushl(&cp.args, "submodule", "update", |
| "--recursive", "--checkout", NULL); |
| argv_push_verbosity(&cp.args); |
| |
| return run_command(&cp); |
| } |
| |
| /** |
| * Runs git-merge, returning its exit status. |
| */ |
| static int run_merge(void) |
| { |
| struct child_process cmd = CHILD_PROCESS_INIT; |
| |
| strvec_pushl(&cmd.args, "merge", NULL); |
| |
| /* Shared options */ |
| argv_push_verbosity(&cmd.args); |
| if (opt_progress) |
| strvec_push(&cmd.args, opt_progress); |
| |
| /* Options passed to git-merge */ |
| if (opt_diffstat) |
| strvec_push(&cmd.args, opt_diffstat); |
| if (opt_log) |
| strvec_push(&cmd.args, opt_log); |
| if (opt_signoff) |
| strvec_push(&cmd.args, opt_signoff); |
| if (opt_squash) |
| strvec_push(&cmd.args, opt_squash); |
| if (opt_commit) |
| strvec_push(&cmd.args, opt_commit); |
| if (opt_edit) |
| strvec_push(&cmd.args, opt_edit); |
| if (cleanup_arg) |
| strvec_pushf(&cmd.args, "--cleanup=%s", cleanup_arg); |
| if (opt_ff) |
| strvec_push(&cmd.args, opt_ff); |
| if (opt_verify) |
| strvec_push(&cmd.args, opt_verify); |
| if (opt_verify_signatures) |
| strvec_push(&cmd.args, opt_verify_signatures); |
| strvec_pushv(&cmd.args, opt_strategies.v); |
| strvec_pushv(&cmd.args, opt_strategy_opts.v); |
| if (opt_gpg_sign) |
| strvec_push(&cmd.args, opt_gpg_sign); |
| if (opt_autostash == 0) |
| strvec_push(&cmd.args, "--no-autostash"); |
| else if (opt_autostash == 1) |
| strvec_push(&cmd.args, "--autostash"); |
| if (opt_allow_unrelated_histories > 0) |
| strvec_push(&cmd.args, "--allow-unrelated-histories"); |
| |
| strvec_push(&cmd.args, "FETCH_HEAD"); |
| cmd.git_cmd = 1; |
| return run_command(&cmd); |
| } |
| |
| /** |
| * Returns remote's upstream branch for the current branch. If remote is NULL, |
| * the current branch's configured default remote is used. Returns NULL if |
| * `remote` does not name a valid remote, HEAD does not point to a branch, |
| * remote is not the branch's configured remote or the branch does not have any |
| * configured upstream branch. |
| */ |
| static const char *get_upstream_branch(const char *remote) |
| { |
| struct remote *rm; |
| struct branch *curr_branch; |
| const char *curr_branch_remote; |
| |
| rm = remote_get(remote); |
| if (!rm) |
| return NULL; |
| |
| curr_branch = branch_get("HEAD"); |
| if (!curr_branch) |
| return NULL; |
| |
| curr_branch_remote = remote_for_branch(curr_branch, NULL); |
| assert(curr_branch_remote); |
| |
| if (strcmp(curr_branch_remote, rm->name)) |
| return NULL; |
| |
| return branch_get_upstream(curr_branch, NULL); |
| } |
| |
| /** |
| * Derives the remote-tracking branch from the remote and refspec. |
| * |
| * FIXME: The current implementation assumes the default mapping of |
| * refs/heads/<branch_name> to refs/remotes/<remote_name>/<branch_name>. |
| */ |
| static const char *get_tracking_branch(const char *remote, const char *refspec) |
| { |
| struct refspec_item spec; |
| const char *spec_src; |
| const char *merge_branch; |
| |
| refspec_item_init_or_die(&spec, refspec, REFSPEC_FETCH); |
| spec_src = spec.src; |
| if (!*spec_src || !strcmp(spec_src, "HEAD")) |
| spec_src = "HEAD"; |
| else if (skip_prefix(spec_src, "heads/", &spec_src)) |
| ; |
| else if (skip_prefix(spec_src, "refs/heads/", &spec_src)) |
| ; |
| else if (starts_with(spec_src, "refs/") || |
| starts_with(spec_src, "tags/") || |
| starts_with(spec_src, "remotes/")) |
| spec_src = ""; |
| |
| if (*spec_src) { |
| if (!strcmp(remote, ".")) |
| merge_branch = mkpath("refs/heads/%s", spec_src); |
| else |
| merge_branch = mkpath("refs/remotes/%s/%s", remote, spec_src); |
| } else |
| merge_branch = NULL; |
| |
| refspec_item_clear(&spec); |
| return merge_branch; |
| } |
| |
| /** |
| * Given the repo and refspecs, sets fork_point to the point at which the |
| * current branch forked from its remote-tracking branch. Returns 0 on success, |
| * -1 on failure. |
| */ |
| static int get_rebase_fork_point(struct object_id *fork_point, const char *repo, |
| const char *refspec) |
| { |
| int ret; |
| struct branch *curr_branch; |
| const char *remote_branch; |
| struct child_process cp = CHILD_PROCESS_INIT; |
| struct strbuf sb = STRBUF_INIT; |
| |
| curr_branch = branch_get("HEAD"); |
| if (!curr_branch) |
| return -1; |
| |
| if (refspec) |
| remote_branch = get_tracking_branch(repo, refspec); |
| else |
| remote_branch = get_upstream_branch(repo); |
| |
| if (!remote_branch) |
| return -1; |
| |
| strvec_pushl(&cp.args, "merge-base", "--fork-point", |
| remote_branch, curr_branch->name, NULL); |
| cp.no_stdin = 1; |
| cp.no_stderr = 1; |
| cp.git_cmd = 1; |
| |
| ret = capture_command(&cp, &sb, GIT_MAX_HEXSZ); |
| if (ret) |
| goto cleanup; |
| |
| ret = get_oid_hex(sb.buf, fork_point); |
| if (ret) |
| goto cleanup; |
| |
| cleanup: |
| strbuf_release(&sb); |
| return ret ? -1 : 0; |
| } |
| |
| /** |
| * Sets merge_base to the octopus merge base of curr_head, merge_head and |
| * fork_point. Returns 0 if a merge base is found, 1 otherwise. |
| */ |
| static int get_octopus_merge_base(struct object_id *merge_base, |
| const struct object_id *curr_head, |
| const struct object_id *merge_head, |
| const struct object_id *fork_point) |
| { |
| struct commit_list *revs = NULL, *result; |
| |
| commit_list_insert(lookup_commit_reference(the_repository, curr_head), |
| &revs); |
| commit_list_insert(lookup_commit_reference(the_repository, merge_head), |
| &revs); |
| if (!is_null_oid(fork_point)) |
| commit_list_insert(lookup_commit_reference(the_repository, fork_point), |
| &revs); |
| |
| result = get_octopus_merge_bases(revs); |
| free_commit_list(revs); |
| reduce_heads_replace(&result); |
| |
| if (!result) |
| return 1; |
| |
| oidcpy(merge_base, &result->item->object.oid); |
| free_commit_list(result); |
| return 0; |
| } |
| |
| /** |
| * Given the current HEAD oid, the merge head returned from git-fetch and the |
| * fork point calculated by get_rebase_fork_point(), compute the <newbase> and |
| * <upstream> arguments to use for the upcoming git-rebase invocation. |
| */ |
| static int get_rebase_newbase_and_upstream(struct object_id *newbase, |
| struct object_id *upstream, |
| const struct object_id *curr_head, |
| const struct object_id *merge_head, |
| const struct object_id *fork_point) |
| { |
| struct object_id oct_merge_base; |
| |
| if (!get_octopus_merge_base(&oct_merge_base, curr_head, merge_head, fork_point)) |
| if (!is_null_oid(fork_point) && oideq(&oct_merge_base, fork_point)) |
| fork_point = NULL; |
| |
| if (fork_point && !is_null_oid(fork_point)) |
| oidcpy(upstream, fork_point); |
| else |
| oidcpy(upstream, merge_head); |
| |
| oidcpy(newbase, merge_head); |
| |
| return 0; |
| } |
| |
| /** |
| * Given the <newbase> and <upstream> calculated by |
| * get_rebase_newbase_and_upstream(), runs git-rebase with the |
| * appropriate arguments and returns its exit status. |
| */ |
| static int run_rebase(const struct object_id *newbase, |
| const struct object_id *upstream) |
| { |
| struct child_process cmd = CHILD_PROCESS_INIT; |
| |
| strvec_push(&cmd.args, "rebase"); |
| |
| /* Shared options */ |
| argv_push_verbosity(&cmd.args); |
| |
| /* Options passed to git-rebase */ |
| if (opt_rebase == REBASE_MERGES) |
| strvec_push(&cmd.args, "--rebase-merges"); |
| else if (opt_rebase == REBASE_INTERACTIVE) |
| strvec_push(&cmd.args, "--interactive"); |
| if (opt_diffstat) |
| strvec_push(&cmd.args, opt_diffstat); |
| strvec_pushv(&cmd.args, opt_strategies.v); |
| strvec_pushv(&cmd.args, opt_strategy_opts.v); |
| if (opt_gpg_sign) |
| strvec_push(&cmd.args, opt_gpg_sign); |
| if (opt_signoff) |
| strvec_push(&cmd.args, opt_signoff); |
| if (opt_autostash == 0) |
| strvec_push(&cmd.args, "--no-autostash"); |
| else if (opt_autostash == 1) |
| strvec_push(&cmd.args, "--autostash"); |
| if (opt_verify_signatures && |
| !strcmp(opt_verify_signatures, "--verify-signatures")) |
| warning(_("ignoring --verify-signatures for rebase")); |
| |
| strvec_push(&cmd.args, "--onto"); |
| strvec_push(&cmd.args, oid_to_hex(newbase)); |
| |
| strvec_push(&cmd.args, oid_to_hex(upstream)); |
| |
| cmd.git_cmd = 1; |
| return run_command(&cmd); |
| } |
| |
| static int get_can_ff(struct object_id *orig_head, |
| struct oid_array *merge_heads) |
| { |
| int ret; |
| struct commit_list *list = NULL; |
| struct commit *merge_head, *head; |
| struct object_id *orig_merge_head; |
| |
| if (merge_heads->nr > 1) |
| return 0; |
| |
| orig_merge_head = &merge_heads->oid[0]; |
| head = lookup_commit_reference(the_repository, orig_head); |
| commit_list_insert(head, &list); |
| merge_head = lookup_commit_reference(the_repository, orig_merge_head); |
| ret = repo_is_descendant_of(the_repository, merge_head, list); |
| free_commit_list(list); |
| return ret; |
| } |
| |
| /* |
| * Is orig_head a descendant of _all_ merge_heads? |
| * Unfortunately is_descendant_of() cannot be used as it asks |
| * if orig_head is a descendant of at least one of them. |
| */ |
| static int already_up_to_date(struct object_id *orig_head, |
| struct oid_array *merge_heads) |
| { |
| int i; |
| struct commit *ours; |
| |
| ours = lookup_commit_reference(the_repository, orig_head); |
| for (i = 0; i < merge_heads->nr; i++) { |
| struct commit_list *list = NULL; |
| struct commit *theirs; |
| int ok; |
| |
| theirs = lookup_commit_reference(the_repository, &merge_heads->oid[i]); |
| commit_list_insert(theirs, &list); |
| ok = repo_is_descendant_of(the_repository, ours, list); |
| free_commit_list(list); |
| if (!ok) |
| return 0; |
| } |
| return 1; |
| } |
| |
| static void show_advice_pull_non_ff(void) |
| { |
| advise(_("You have divergent branches and need to specify how to reconcile them.\n" |
| "You can do so by running one of the following commands sometime before\n" |
| "your next pull:\n" |
| "\n" |
| " git config pull.rebase false # merge\n" |
| " git config pull.rebase true # rebase\n" |
| " git config pull.ff only # fast-forward only\n" |
| "\n" |
| "You can replace \"git config\" with \"git config --global\" to set a default\n" |
| "preference for all repositories. You can also pass --rebase, --no-rebase,\n" |
| "or --ff-only on the command line to override the configured default per\n" |
| "invocation.\n")); |
| } |
| |
| int cmd_pull(int argc, const char **argv, const char *prefix) |
| { |
| const char *repo, **refspecs; |
| struct oid_array merge_heads = OID_ARRAY_INIT; |
| struct object_id orig_head, curr_head; |
| struct object_id rebase_fork_point; |
| int rebase_unspecified = 0; |
| int can_ff; |
| int divergent; |
| int ret; |
| |
| if (!getenv("GIT_REFLOG_ACTION")) |
| set_reflog_message(argc, argv); |
| |
| git_config(git_pull_config, NULL); |
| if (the_repository->gitdir) { |
| prepare_repo_settings(the_repository); |
| the_repository->settings.command_requires_full_index = 0; |
| } |
| |
| argc = parse_options(argc, argv, prefix, pull_options, pull_usage, 0); |
| |
| if (recurse_submodules_cli != RECURSE_SUBMODULES_DEFAULT) |
| recurse_submodules = recurse_submodules_cli; |
| |
| if (cleanup_arg) |
| /* |
| * this only checks the validity of cleanup_arg; we don't need |
| * a valid value for use_editor |
| */ |
| get_cleanup_mode(cleanup_arg, 0); |
| |
| parse_repo_refspecs(argc, argv, &repo, &refspecs); |
| |
| if (!opt_ff) { |
| opt_ff = xstrdup_or_null(config_get_ff()); |
| /* |
| * A subtle point: opt_ff was set on the line above via |
| * reading from config. opt_rebase, in contrast, is set |
| * before this point via command line options. The setting |
| * of opt_rebase via reading from config (using |
| * config_get_rebase()) does not happen until later. We |
| * are relying on the next if-condition happening before |
| * the config_get_rebase() call so that an explicit |
| * "--rebase" can override a config setting of |
| * pull.ff=only. |
| */ |
| if (opt_rebase >= 0 && opt_ff && !strcmp(opt_ff, "--ff-only")) |
| opt_ff = "--ff"; |
| } |
| |
| if (opt_rebase < 0) |
| opt_rebase = config_get_rebase(&rebase_unspecified); |
| |
| if (repo_read_index_unmerged(the_repository)) |
| die_resolve_conflict("pull"); |
| |
| if (file_exists(git_path_merge_head(the_repository))) |
| die_conclude_merge(); |
| |
| if (repo_get_oid(the_repository, "HEAD", &orig_head)) |
| oidclr(&orig_head); |
| |
| if (opt_rebase) { |
| if (opt_autostash == -1) |
| opt_autostash = config_autostash; |
| |
| if (is_null_oid(&orig_head) && !is_index_unborn(&the_index)) |
| die(_("Updating an unborn branch with changes added to the index.")); |
| |
| if (!opt_autostash) |
| require_clean_work_tree(the_repository, |
| N_("pull with rebase"), |
| _("Please commit or stash them."), 1, 0); |
| |
| if (get_rebase_fork_point(&rebase_fork_point, repo, *refspecs)) |
| oidclr(&rebase_fork_point); |
| } |
| |
| if (run_fetch(repo, refspecs)) |
| return 1; |
| |
| if (opt_dry_run) |
| return 0; |
| |
| if (repo_get_oid(the_repository, "HEAD", &curr_head)) |
| oidclr(&curr_head); |
| |
| if (!is_null_oid(&orig_head) && !is_null_oid(&curr_head) && |
| !oideq(&orig_head, &curr_head)) { |
| /* |
| * The fetch involved updating the current branch. |
| * |
| * The working tree and the index file are still based on |
| * orig_head commit, but we are merging into curr_head. |
| * Update the working tree to match curr_head. |
| */ |
| |
| warning(_("fetch updated the current branch head.\n" |
| "fast-forwarding your working tree from\n" |
| "commit %s."), oid_to_hex(&orig_head)); |
| |
| if (checkout_fast_forward(the_repository, &orig_head, |
| &curr_head, 0)) |
| die(_("Cannot fast-forward your working tree.\n" |
| "After making sure that you saved anything precious from\n" |
| "$ git diff %s\n" |
| "output, run\n" |
| "$ git reset --hard\n" |
| "to recover."), oid_to_hex(&orig_head)); |
| } |
| |
| get_merge_heads(&merge_heads); |
| |
| if (!merge_heads.nr) |
| die_no_merge_candidates(repo, refspecs); |
| |
| if (is_null_oid(&orig_head)) { |
| if (merge_heads.nr > 1) |
| die(_("Cannot merge multiple branches into empty head.")); |
| ret = pull_into_void(merge_heads.oid, &curr_head); |
| goto cleanup; |
| } |
| if (merge_heads.nr > 1) { |
| if (opt_rebase) |
| die(_("Cannot rebase onto multiple branches.")); |
| if (opt_ff && !strcmp(opt_ff, "--ff-only")) |
| die(_("Cannot fast-forward to multiple branches.")); |
| } |
| |
| can_ff = get_can_ff(&orig_head, &merge_heads); |
| divergent = !can_ff && !already_up_to_date(&orig_head, &merge_heads); |
| |
| /* ff-only takes precedence over rebase */ |
| if (opt_ff && !strcmp(opt_ff, "--ff-only")) { |
| if (divergent) |
| die_ff_impossible(); |
| opt_rebase = REBASE_FALSE; |
| } |
| /* If no action specified and we can't fast forward, then warn. */ |
| if (!opt_ff && rebase_unspecified && divergent) { |
| show_advice_pull_non_ff(); |
| die(_("Need to specify how to reconcile divergent branches.")); |
| } |
| |
| if (opt_rebase) { |
| struct object_id newbase; |
| struct object_id upstream; |
| get_rebase_newbase_and_upstream(&newbase, &upstream, &curr_head, |
| merge_heads.oid, &rebase_fork_point); |
| |
| if ((recurse_submodules == RECURSE_SUBMODULES_ON || |
| recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) && |
| submodule_touches_in_range(the_repository, &upstream, &curr_head)) |
| die(_("cannot rebase with locally recorded submodule modifications")); |
| |
| if (can_ff) { |
| /* we can fast-forward this without invoking rebase */ |
| opt_ff = "--ff-only"; |
| ret = run_merge(); |
| } else { |
| ret = run_rebase(&newbase, &upstream); |
| } |
| |
| if (!ret && (recurse_submodules == RECURSE_SUBMODULES_ON || |
| recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)) |
| ret = rebase_submodules(); |
| |
| goto cleanup; |
| } else { |
| ret = run_merge(); |
| if (!ret && (recurse_submodules == RECURSE_SUBMODULES_ON || |
| recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)) |
| ret = update_submodules(); |
| goto cleanup; |
| } |
| |
| cleanup: |
| oid_array_clear(&merge_heads); |
| return ret; |
| } |