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6652716200
Code cleanup. * dl/opt-callback-cleanup: Use OPT_CALLBACK and OPT_CALLBACK_F
1051 lines
31 KiB
C
1051 lines
31 KiB
C
/*
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* Builtin "git pull"
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*
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* Based on git-pull.sh by Junio C Hamano
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*
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* Fetch one or more remote refs and merge it/them into the current HEAD.
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*/
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#define USE_THE_INDEX_COMPATIBILITY_MACROS
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#include "cache.h"
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#include "config.h"
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#include "builtin.h"
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#include "parse-options.h"
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#include "exec-cmd.h"
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#include "run-command.h"
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#include "oid-array.h"
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#include "remote.h"
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#include "dir.h"
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#include "rebase.h"
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#include "refs.h"
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#include "refspec.h"
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#include "revision.h"
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#include "submodule.h"
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#include "submodule-config.h"
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#include "tempfile.h"
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#include "lockfile.h"
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#include "wt-status.h"
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#include "commit-reach.h"
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#include "sequencer.h"
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/**
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* Parses the value of --rebase. If value is a false value, returns
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* REBASE_FALSE. If value is a true value, returns REBASE_TRUE. If value is
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* "merges", returns REBASE_MERGES. If value is "preserve", returns
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* REBASE_PRESERVE. If value is a invalid value, dies with a fatal error if
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* fatal is true, otherwise returns REBASE_INVALID.
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*/
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static enum rebase_type parse_config_rebase(const char *key, const char *value,
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int fatal)
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{
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enum rebase_type v = rebase_parse_value(value);
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if (v != REBASE_INVALID)
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return v;
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if (fatal)
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die(_("Invalid value for %s: %s"), key, value);
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else
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error(_("Invalid value for %s: %s"), key, value);
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return REBASE_INVALID;
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}
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/**
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* Callback for --rebase, which parses arg with parse_config_rebase().
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*/
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static int parse_opt_rebase(const struct option *opt, const char *arg, int unset)
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{
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enum rebase_type *value = opt->value;
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if (arg)
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*value = parse_config_rebase("--rebase", arg, 0);
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else
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*value = unset ? REBASE_FALSE : REBASE_TRUE;
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return *value == REBASE_INVALID ? -1 : 0;
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}
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static const char * const pull_usage[] = {
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N_("git pull [<options>] [<repository> [<refspec>...]]"),
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NULL
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};
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/* Shared options */
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static int opt_verbosity;
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static char *opt_progress;
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static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
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/* Options passed to git-merge or git-rebase */
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static enum rebase_type opt_rebase = -1;
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static char *opt_diffstat;
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static char *opt_log;
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static char *opt_signoff;
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static char *opt_squash;
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static char *opt_commit;
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static char *opt_edit;
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static char *cleanup_arg;
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static char *opt_ff;
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static char *opt_verify_signatures;
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static int opt_autostash = -1;
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static int config_autostash;
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static int check_trust_level = 1;
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static struct argv_array opt_strategies = ARGV_ARRAY_INIT;
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static struct argv_array opt_strategy_opts = ARGV_ARRAY_INIT;
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static char *opt_gpg_sign;
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static int opt_allow_unrelated_histories;
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/* Options passed to git-fetch */
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static char *opt_all;
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static char *opt_append;
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static char *opt_upload_pack;
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static int opt_force;
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static char *opt_tags;
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static char *opt_prune;
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static char *max_children;
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static int opt_dry_run;
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static char *opt_keep;
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static char *opt_depth;
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static char *opt_unshallow;
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static char *opt_update_shallow;
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static char *opt_refmap;
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static char *opt_ipv4;
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static char *opt_ipv6;
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static int opt_show_forced_updates = -1;
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static char *set_upstream;
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static struct argv_array opt_fetch = ARGV_ARRAY_INIT;
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static struct option pull_options[] = {
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/* Shared options */
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OPT__VERBOSITY(&opt_verbosity),
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OPT_PASSTHRU(0, "progress", &opt_progress, NULL,
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N_("force progress reporting"),
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PARSE_OPT_NOARG),
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OPT_CALLBACK_F(0, "recurse-submodules",
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&recurse_submodules, N_("on-demand"),
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N_("control for recursive fetching of submodules"),
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PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules),
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/* Options passed to git-merge or git-rebase */
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OPT_GROUP(N_("Options related to merging")),
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OPT_CALLBACK_F('r', "rebase", &opt_rebase,
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"(false|true|merges|preserve|interactive)",
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N_("incorporate changes by rebasing rather than merging"),
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PARSE_OPT_OPTARG, parse_opt_rebase),
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OPT_PASSTHRU('n', NULL, &opt_diffstat, NULL,
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N_("do not show a diffstat at the end of the merge"),
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PARSE_OPT_NOARG | PARSE_OPT_NONEG),
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OPT_PASSTHRU(0, "stat", &opt_diffstat, NULL,
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N_("show a diffstat at the end of the merge"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU(0, "summary", &opt_diffstat, NULL,
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N_("(synonym to --stat)"),
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PARSE_OPT_NOARG | PARSE_OPT_HIDDEN),
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OPT_PASSTHRU(0, "log", &opt_log, N_("n"),
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N_("add (at most <n>) entries from shortlog to merge commit message"),
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PARSE_OPT_OPTARG),
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OPT_PASSTHRU(0, "signoff", &opt_signoff, NULL,
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N_("add Signed-off-by:"),
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PARSE_OPT_OPTARG),
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OPT_PASSTHRU(0, "squash", &opt_squash, NULL,
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N_("create a single commit instead of doing a merge"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU(0, "commit", &opt_commit, NULL,
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N_("perform a commit if the merge succeeds (default)"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU(0, "edit", &opt_edit, NULL,
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N_("edit message before committing"),
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PARSE_OPT_NOARG),
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OPT_CLEANUP(&cleanup_arg),
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OPT_PASSTHRU(0, "ff", &opt_ff, NULL,
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N_("allow fast-forward"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU(0, "ff-only", &opt_ff, NULL,
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N_("abort if fast-forward is not possible"),
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PARSE_OPT_NOARG | PARSE_OPT_NONEG),
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OPT_PASSTHRU(0, "verify-signatures", &opt_verify_signatures, NULL,
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N_("verify that the named commit has a valid GPG signature"),
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PARSE_OPT_NOARG),
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OPT_BOOL(0, "autostash", &opt_autostash,
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N_("automatically stash/stash pop before and after")),
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OPT_PASSTHRU_ARGV('s', "strategy", &opt_strategies, N_("strategy"),
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N_("merge strategy to use"),
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0),
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OPT_PASSTHRU_ARGV('X', "strategy-option", &opt_strategy_opts,
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N_("option=value"),
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N_("option for selected merge strategy"),
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0),
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OPT_PASSTHRU('S', "gpg-sign", &opt_gpg_sign, N_("key-id"),
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N_("GPG sign commit"),
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PARSE_OPT_OPTARG),
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OPT_SET_INT(0, "allow-unrelated-histories",
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&opt_allow_unrelated_histories,
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N_("allow merging unrelated histories"), 1),
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/* Options passed to git-fetch */
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OPT_GROUP(N_("Options related to fetching")),
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OPT_PASSTHRU(0, "all", &opt_all, NULL,
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N_("fetch from all remotes"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU('a', "append", &opt_append, NULL,
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N_("append to .git/FETCH_HEAD instead of overwriting"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU(0, "upload-pack", &opt_upload_pack, N_("path"),
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N_("path to upload pack on remote end"),
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0),
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OPT__FORCE(&opt_force, N_("force overwrite of local branch"), 0),
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OPT_PASSTHRU('t', "tags", &opt_tags, NULL,
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N_("fetch all tags and associated objects"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU('p', "prune", &opt_prune, NULL,
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N_("prune remote-tracking branches no longer on remote"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU('j', "jobs", &max_children, N_("n"),
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N_("number of submodules pulled in parallel"),
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PARSE_OPT_OPTARG),
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OPT_BOOL(0, "dry-run", &opt_dry_run,
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N_("dry run")),
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OPT_PASSTHRU('k', "keep", &opt_keep, NULL,
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N_("keep downloaded pack"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU(0, "depth", &opt_depth, N_("depth"),
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N_("deepen history of shallow clone"),
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0),
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OPT_PASSTHRU_ARGV(0, "shallow-since", &opt_fetch, N_("time"),
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N_("deepen history of shallow repository based on time"),
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0),
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OPT_PASSTHRU_ARGV(0, "shallow-exclude", &opt_fetch, N_("revision"),
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N_("deepen history of shallow clone, excluding rev"),
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0),
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OPT_PASSTHRU_ARGV(0, "deepen", &opt_fetch, N_("n"),
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N_("deepen history of shallow clone"),
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0),
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OPT_PASSTHRU(0, "unshallow", &opt_unshallow, NULL,
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N_("convert to a complete repository"),
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PARSE_OPT_NONEG | PARSE_OPT_NOARG),
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OPT_PASSTHRU(0, "update-shallow", &opt_update_shallow, NULL,
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N_("accept refs that update .git/shallow"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU(0, "refmap", &opt_refmap, N_("refmap"),
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N_("specify fetch refmap"),
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PARSE_OPT_NONEG),
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OPT_PASSTHRU_ARGV('o', "server-option", &opt_fetch,
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N_("server-specific"),
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N_("option to transmit"),
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0),
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OPT_PASSTHRU('4', "ipv4", &opt_ipv4, NULL,
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N_("use IPv4 addresses only"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU('6', "ipv6", &opt_ipv6, NULL,
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N_("use IPv6 addresses only"),
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PARSE_OPT_NOARG),
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OPT_PASSTHRU_ARGV(0, "negotiation-tip", &opt_fetch, N_("revision"),
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N_("report that we have only objects reachable from this object"),
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0),
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OPT_BOOL(0, "show-forced-updates", &opt_show_forced_updates,
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N_("check for forced-updates on all updated branches")),
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OPT_PASSTHRU(0, "set-upstream", &set_upstream, NULL,
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N_("set upstream for git pull/fetch"),
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PARSE_OPT_NOARG),
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OPT_END()
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};
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/**
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* Pushes "-q" or "-v" switches into arr to match the opt_verbosity level.
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*/
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static void argv_push_verbosity(struct argv_array *arr)
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{
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int verbosity;
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for (verbosity = opt_verbosity; verbosity > 0; verbosity--)
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argv_array_push(arr, "-v");
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for (verbosity = opt_verbosity; verbosity < 0; verbosity++)
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argv_array_push(arr, "-q");
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}
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/**
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* Pushes "-f" switches into arr to match the opt_force level.
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*/
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static void argv_push_force(struct argv_array *arr)
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{
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int force = opt_force;
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while (force-- > 0)
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argv_array_push(arr, "-f");
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}
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/**
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* Sets the GIT_REFLOG_ACTION environment variable to the concatenation of argv
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*/
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static void set_reflog_message(int argc, const char **argv)
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{
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int i;
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struct strbuf msg = STRBUF_INIT;
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for (i = 0; i < argc; i++) {
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if (i)
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strbuf_addch(&msg, ' ');
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strbuf_addstr(&msg, argv[i]);
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}
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setenv("GIT_REFLOG_ACTION", msg.buf, 0);
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strbuf_release(&msg);
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}
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/**
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* If pull.ff is unset, returns NULL. If pull.ff is "true", returns "--ff". If
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* pull.ff is "false", returns "--no-ff". If pull.ff is "only", returns
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* "--ff-only". Otherwise, if pull.ff is set to an invalid value, die with an
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* error.
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*/
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static const char *config_get_ff(void)
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{
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const char *value;
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if (git_config_get_value("pull.ff", &value))
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return NULL;
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switch (git_parse_maybe_bool(value)) {
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case 0:
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return "--no-ff";
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case 1:
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return "--ff";
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}
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if (!strcmp(value, "only"))
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return "--ff-only";
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die(_("Invalid value for pull.ff: %s"), value);
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}
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/**
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* Returns the default configured value for --rebase. It first looks for the
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* value of "branch.$curr_branch.rebase", where $curr_branch is the current
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* branch, and if HEAD is detached or the configuration key does not exist,
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* looks for the value of "pull.rebase". If both configuration keys do not
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* exist, returns REBASE_FALSE.
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*/
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static enum rebase_type config_get_rebase(void)
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{
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struct branch *curr_branch = branch_get("HEAD");
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const char *value;
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if (curr_branch) {
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char *key = xstrfmt("branch.%s.rebase", curr_branch->name);
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if (!git_config_get_value(key, &value)) {
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enum rebase_type ret = parse_config_rebase(key, value, 1);
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free(key);
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return ret;
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}
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free(key);
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}
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if (!git_config_get_value("pull.rebase", &value))
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return parse_config_rebase("pull.rebase", value, 1);
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if (opt_verbosity >= 0 &&
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(!opt_ff || strcmp(opt_ff, "--ff-only"))) {
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warning(_("Pulling without specifying how to reconcile divergent branches is\n"
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"discouraged. You can squelch this message by running one of the following\n"
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"commands sometime before your next pull:\n"
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"\n"
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" git config pull.rebase false # merge (the default strategy)\n"
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" git config pull.rebase true # rebase\n"
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" git config pull.ff only # fast-forward only\n"
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"\n"
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"You can replace \"git config\" with \"git config --global\" to set a default\n"
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"preference for all repositories. You can also pass --rebase, --no-rebase,\n"
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"or --ff-only on the command line to override the configured default per\n"
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"invocation.\n"));
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}
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return REBASE_FALSE;
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}
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/**
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* Read config variables.
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*/
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static int git_pull_config(const char *var, const char *value, void *cb)
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{
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int status;
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if (!strcmp(var, "rebase.autostash")) {
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config_autostash = git_config_bool(var, value);
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return 0;
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} else if (!strcmp(var, "submodule.recurse")) {
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recurse_submodules = git_config_bool(var, value) ?
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RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
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return 0;
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} else if (!strcmp(var, "gpg.mintrustlevel")) {
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check_trust_level = 0;
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}
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status = git_gpg_config(var, value, cb);
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if (status)
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return status;
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return git_default_config(var, value, cb);
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}
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/**
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* Appends merge candidates from FETCH_HEAD that are not marked not-for-merge
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* into merge_heads.
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*/
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static void get_merge_heads(struct oid_array *merge_heads)
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{
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const char *filename = git_path_fetch_head(the_repository);
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FILE *fp;
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struct strbuf sb = STRBUF_INIT;
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struct object_id oid;
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fp = xfopen(filename, "r");
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while (strbuf_getline_lf(&sb, fp) != EOF) {
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const char *p;
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if (parse_oid_hex(sb.buf, &oid, &p))
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continue; /* invalid line: does not start with object ID */
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if (starts_with(p, "\tnot-for-merge\t"))
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continue; /* ref is not-for-merge */
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oid_array_append(merge_heads, &oid);
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}
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fclose(fp);
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strbuf_release(&sb);
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}
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/**
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* Used by die_no_merge_candidates() as a for_each_remote() callback to
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* retrieve the name of the remote if the repository only has one remote.
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*/
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static int get_only_remote(struct remote *remote, void *cb_data)
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{
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const char **remote_name = cb_data;
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if (*remote_name)
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return -1;
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*remote_name = remote->name;
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return 0;
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}
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/**
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* Dies with the appropriate reason for why there are no merge candidates:
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*
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* 1. We fetched from a specific remote, and a refspec was given, but it ended
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* up not fetching anything. This is usually because the user provided a
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* wildcard refspec which had no matches on the remote end.
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*
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* 2. We fetched from a non-default remote, but didn't specify a branch to
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* merge. We can't use the configured one because it applies to the default
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* remote, thus the user must specify the branches to merge.
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*
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* 3. We fetched from the branch's or repo's default remote, but:
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*
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* a. We are not on a branch, so there will never be a configured branch to
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* merge with.
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*
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* b. We are on a branch, but there is no configured branch to merge with.
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*
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* 4. We fetched from the branch's or repo's default remote, but the configured
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* branch to merge didn't get fetched. (Either it doesn't exist, or wasn't
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* part of the configured fetch refspec.)
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*/
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static void NORETURN die_no_merge_candidates(const char *repo, const char **refspecs)
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{
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struct branch *curr_branch = branch_get("HEAD");
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const char *remote = curr_branch ? curr_branch->remote_name : NULL;
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if (*refspecs) {
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if (opt_rebase)
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fprintf_ln(stderr, _("There is no candidate for rebasing against among the refs that you just fetched."));
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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 argv_array args = ARGV_ARRAY_INIT;
|
|
int ret;
|
|
|
|
argv_array_pushl(&args, "fetch", "--update-head-ok", NULL);
|
|
|
|
/* Shared options */
|
|
argv_push_verbosity(&args);
|
|
if (opt_progress)
|
|
argv_array_push(&args, opt_progress);
|
|
|
|
/* Options passed to git-fetch */
|
|
if (opt_all)
|
|
argv_array_push(&args, opt_all);
|
|
if (opt_append)
|
|
argv_array_push(&args, opt_append);
|
|
if (opt_upload_pack)
|
|
argv_array_push(&args, opt_upload_pack);
|
|
argv_push_force(&args);
|
|
if (opt_tags)
|
|
argv_array_push(&args, opt_tags);
|
|
if (opt_prune)
|
|
argv_array_push(&args, opt_prune);
|
|
if (recurse_submodules != RECURSE_SUBMODULES_DEFAULT)
|
|
switch (recurse_submodules) {
|
|
case RECURSE_SUBMODULES_ON:
|
|
argv_array_push(&args, "--recurse-submodules=on");
|
|
break;
|
|
case RECURSE_SUBMODULES_OFF:
|
|
argv_array_push(&args, "--recurse-submodules=no");
|
|
break;
|
|
case RECURSE_SUBMODULES_ON_DEMAND:
|
|
argv_array_push(&args, "--recurse-submodules=on-demand");
|
|
break;
|
|
default:
|
|
BUG("submodule recursion option not understood");
|
|
}
|
|
if (max_children)
|
|
argv_array_push(&args, max_children);
|
|
if (opt_dry_run)
|
|
argv_array_push(&args, "--dry-run");
|
|
if (opt_keep)
|
|
argv_array_push(&args, opt_keep);
|
|
if (opt_depth)
|
|
argv_array_push(&args, opt_depth);
|
|
if (opt_unshallow)
|
|
argv_array_push(&args, opt_unshallow);
|
|
if (opt_update_shallow)
|
|
argv_array_push(&args, opt_update_shallow);
|
|
if (opt_refmap)
|
|
argv_array_push(&args, opt_refmap);
|
|
if (opt_ipv4)
|
|
argv_array_push(&args, opt_ipv4);
|
|
if (opt_ipv6)
|
|
argv_array_push(&args, opt_ipv6);
|
|
if (opt_show_forced_updates > 0)
|
|
argv_array_push(&args, "--show-forced-updates");
|
|
else if (opt_show_forced_updates == 0)
|
|
argv_array_push(&args, "--no-show-forced-updates");
|
|
if (set_upstream)
|
|
argv_array_push(&args, set_upstream);
|
|
argv_array_pushv(&args, opt_fetch.argv);
|
|
|
|
if (repo) {
|
|
argv_array_push(&args, repo);
|
|
argv_array_pushv(&args, refspecs);
|
|
} else if (*refspecs)
|
|
BUG("refspecs without repo?");
|
|
ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
|
|
argv_array_clear(&args);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* "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;
|
|
argv_array_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;
|
|
argv_array_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)
|
|
{
|
|
int ret;
|
|
struct argv_array args = ARGV_ARRAY_INIT;
|
|
|
|
argv_array_pushl(&args, "merge", NULL);
|
|
|
|
/* Shared options */
|
|
argv_push_verbosity(&args);
|
|
if (opt_progress)
|
|
argv_array_push(&args, opt_progress);
|
|
|
|
/* Options passed to git-merge */
|
|
if (opt_diffstat)
|
|
argv_array_push(&args, opt_diffstat);
|
|
if (opt_log)
|
|
argv_array_push(&args, opt_log);
|
|
if (opt_signoff)
|
|
argv_array_push(&args, opt_signoff);
|
|
if (opt_squash)
|
|
argv_array_push(&args, opt_squash);
|
|
if (opt_commit)
|
|
argv_array_push(&args, opt_commit);
|
|
if (opt_edit)
|
|
argv_array_push(&args, opt_edit);
|
|
if (cleanup_arg)
|
|
argv_array_pushf(&args, "--cleanup=%s", cleanup_arg);
|
|
if (opt_ff)
|
|
argv_array_push(&args, opt_ff);
|
|
if (opt_verify_signatures)
|
|
argv_array_push(&args, opt_verify_signatures);
|
|
argv_array_pushv(&args, opt_strategies.argv);
|
|
argv_array_pushv(&args, opt_strategy_opts.argv);
|
|
if (opt_gpg_sign)
|
|
argv_array_push(&args, opt_gpg_sign);
|
|
if (opt_autostash == 0)
|
|
argv_array_push(&args, "--no-autostash");
|
|
else if (opt_autostash == 1)
|
|
argv_array_push(&args, "--autostash");
|
|
if (opt_allow_unrelated_histories > 0)
|
|
argv_array_push(&args, "--allow-unrelated-histories");
|
|
|
|
argv_array_push(&args, "FETCH_HEAD");
|
|
ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
|
|
argv_array_clear(&args);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
argv_array_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(), runs git-rebase with the
|
|
* appropriate arguments and returns its exit status.
|
|
*/
|
|
static int run_rebase(const struct object_id *curr_head,
|
|
const struct object_id *merge_head,
|
|
const struct object_id *fork_point)
|
|
{
|
|
int ret;
|
|
struct object_id oct_merge_base;
|
|
struct argv_array args = ARGV_ARRAY_INIT;
|
|
|
|
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;
|
|
|
|
argv_array_push(&args, "rebase");
|
|
|
|
/* Shared options */
|
|
argv_push_verbosity(&args);
|
|
|
|
/* Options passed to git-rebase */
|
|
if (opt_rebase == REBASE_MERGES)
|
|
argv_array_push(&args, "--rebase-merges");
|
|
else if (opt_rebase == REBASE_PRESERVE)
|
|
argv_array_push(&args, "--preserve-merges");
|
|
else if (opt_rebase == REBASE_INTERACTIVE)
|
|
argv_array_push(&args, "--interactive");
|
|
if (opt_diffstat)
|
|
argv_array_push(&args, opt_diffstat);
|
|
argv_array_pushv(&args, opt_strategies.argv);
|
|
argv_array_pushv(&args, opt_strategy_opts.argv);
|
|
if (opt_gpg_sign)
|
|
argv_array_push(&args, opt_gpg_sign);
|
|
if (opt_autostash == 0)
|
|
argv_array_push(&args, "--no-autostash");
|
|
else if (opt_autostash == 1)
|
|
argv_array_push(&args, "--autostash");
|
|
if (opt_verify_signatures &&
|
|
!strcmp(opt_verify_signatures, "--verify-signatures"))
|
|
warning(_("ignoring --verify-signatures for rebase"));
|
|
|
|
argv_array_push(&args, "--onto");
|
|
argv_array_push(&args, oid_to_hex(merge_head));
|
|
|
|
if (fork_point && !is_null_oid(fork_point))
|
|
argv_array_push(&args, oid_to_hex(fork_point));
|
|
else
|
|
argv_array_push(&args, oid_to_hex(merge_head));
|
|
|
|
ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
|
|
argv_array_clear(&args);
|
|
return ret;
|
|
}
|
|
|
|
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 autostash;
|
|
|
|
if (!getenv("GIT_REFLOG_ACTION"))
|
|
set_reflog_message(argc, argv);
|
|
|
|
git_config(git_pull_config, NULL);
|
|
|
|
argc = parse_options(argc, argv, prefix, pull_options, pull_usage, 0);
|
|
|
|
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());
|
|
|
|
if (opt_rebase < 0)
|
|
opt_rebase = config_get_rebase();
|
|
|
|
if (read_cache_unmerged())
|
|
die_resolve_conflict("pull");
|
|
|
|
if (file_exists(git_path_merge_head(the_repository)))
|
|
die_conclude_merge();
|
|
|
|
if (get_oid("HEAD", &orig_head))
|
|
oidclr(&orig_head);
|
|
|
|
autostash = config_autostash;
|
|
if (opt_rebase) {
|
|
if (opt_autostash != -1)
|
|
autostash = opt_autostash;
|
|
|
|
if (is_null_oid(&orig_head) && !is_cache_unborn())
|
|
die(_("Updating an unborn branch with changes added to the index."));
|
|
|
|
if (!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 (get_oid("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."));
|
|
return pull_into_void(merge_heads.oid, &curr_head);
|
|
}
|
|
if (opt_rebase && merge_heads.nr > 1)
|
|
die(_("Cannot rebase onto multiple branches."));
|
|
|
|
if (opt_rebase) {
|
|
int ret = 0;
|
|
int ran_ff = 0;
|
|
if ((recurse_submodules == RECURSE_SUBMODULES_ON ||
|
|
recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) &&
|
|
submodule_touches_in_range(the_repository, &rebase_fork_point, &curr_head))
|
|
die(_("cannot rebase with locally recorded submodule modifications"));
|
|
if (!autostash) {
|
|
struct commit_list *list = NULL;
|
|
struct commit *merge_head, *head;
|
|
|
|
head = lookup_commit_reference(the_repository,
|
|
&orig_head);
|
|
commit_list_insert(head, &list);
|
|
merge_head = lookup_commit_reference(the_repository,
|
|
&merge_heads.oid[0]);
|
|
if (is_descendant_of(merge_head, list)) {
|
|
/* we can fast-forward this without invoking rebase */
|
|
opt_ff = "--ff-only";
|
|
ran_ff = 1;
|
|
ret = run_merge();
|
|
}
|
|
}
|
|
if (!ran_ff)
|
|
ret = run_rebase(&curr_head, merge_heads.oid, &rebase_fork_point);
|
|
|
|
if (!ret && (recurse_submodules == RECURSE_SUBMODULES_ON ||
|
|
recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND))
|
|
ret = rebase_submodules();
|
|
|
|
return ret;
|
|
} else {
|
|
int ret = run_merge();
|
|
if (!ret && (recurse_submodules == RECURSE_SUBMODULES_ON ||
|
|
recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND))
|
|
ret = update_submodules();
|
|
return ret;
|
|
}
|
|
}
|