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![Junio C Hamano](/assets/img/avatar_default.png)
The function takes a user-supplied string that is supposed to be a branch name, and puts it in a strbuf after expanding possible shorthand notation. A handful of open coded sequence to do this in the existing code have been changed to use this helper function. Signed-off-by: Junio C Hamano <gitster@pobox.com>
1220 lines
31 KiB
C
1220 lines
31 KiB
C
/*
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* Builtin "git merge"
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*
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* Copyright (c) 2008 Miklos Vajna <vmiklos@frugalware.org>
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*
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* Based on git-merge.sh by Junio C Hamano.
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*/
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#include "cache.h"
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#include "parse-options.h"
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#include "builtin.h"
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#include "run-command.h"
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#include "diff.h"
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#include "refs.h"
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#include "commit.h"
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#include "diffcore.h"
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#include "revision.h"
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#include "unpack-trees.h"
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#include "cache-tree.h"
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#include "dir.h"
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#include "utf8.h"
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#include "log-tree.h"
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#include "color.h"
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#include "rerere.h"
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#include "help.h"
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#include "merge-recursive.h"
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#define DEFAULT_TWOHEAD (1<<0)
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#define DEFAULT_OCTOPUS (1<<1)
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#define NO_FAST_FORWARD (1<<2)
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#define NO_TRIVIAL (1<<3)
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struct strategy {
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const char *name;
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unsigned attr;
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};
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static const char * const builtin_merge_usage[] = {
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"git merge [options] <remote>...",
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"git merge [options] <msg> HEAD <remote>",
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NULL
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};
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static int show_diffstat = 1, option_log, squash;
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static int option_commit = 1, allow_fast_forward = 1;
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static int allow_trivial = 1, have_message;
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static struct strbuf merge_msg;
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static struct commit_list *remoteheads;
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static unsigned char head[20], stash[20];
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static struct strategy **use_strategies;
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static size_t use_strategies_nr, use_strategies_alloc;
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static const char *branch;
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static int verbosity;
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static struct strategy all_strategy[] = {
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{ "recursive", DEFAULT_TWOHEAD | NO_TRIVIAL },
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{ "octopus", DEFAULT_OCTOPUS },
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{ "resolve", 0 },
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{ "ours", NO_FAST_FORWARD | NO_TRIVIAL },
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{ "subtree", NO_FAST_FORWARD | NO_TRIVIAL },
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};
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static const char *pull_twohead, *pull_octopus;
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static int option_parse_message(const struct option *opt,
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const char *arg, int unset)
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{
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struct strbuf *buf = opt->value;
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if (unset)
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strbuf_setlen(buf, 0);
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else if (arg) {
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strbuf_addf(buf, "%s\n\n", arg);
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have_message = 1;
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} else
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return error("switch `m' requires a value");
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return 0;
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}
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static struct strategy *get_strategy(const char *name)
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{
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int i;
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struct strategy *ret;
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static struct cmdnames main_cmds, other_cmds;
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static int loaded;
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if (!name)
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return NULL;
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for (i = 0; i < ARRAY_SIZE(all_strategy); i++)
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if (!strcmp(name, all_strategy[i].name))
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return &all_strategy[i];
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if (!loaded) {
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struct cmdnames not_strategies;
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loaded = 1;
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memset(¬_strategies, 0, sizeof(struct cmdnames));
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load_command_list("git-merge-", &main_cmds, &other_cmds);
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for (i = 0; i < main_cmds.cnt; i++) {
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int j, found = 0;
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struct cmdname *ent = main_cmds.names[i];
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for (j = 0; j < ARRAY_SIZE(all_strategy); j++)
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if (!strncmp(ent->name, all_strategy[j].name, ent->len)
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&& !all_strategy[j].name[ent->len])
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found = 1;
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if (!found)
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add_cmdname(¬_strategies, ent->name, ent->len);
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exclude_cmds(&main_cmds, ¬_strategies);
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}
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}
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if (!is_in_cmdlist(&main_cmds, name) && !is_in_cmdlist(&other_cmds, name)) {
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fprintf(stderr, "Could not find merge strategy '%s'.\n", name);
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fprintf(stderr, "Available strategies are:");
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for (i = 0; i < main_cmds.cnt; i++)
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fprintf(stderr, " %s", main_cmds.names[i]->name);
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fprintf(stderr, ".\n");
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if (other_cmds.cnt) {
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fprintf(stderr, "Available custom strategies are:");
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for (i = 0; i < other_cmds.cnt; i++)
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fprintf(stderr, " %s", other_cmds.names[i]->name);
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fprintf(stderr, ".\n");
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}
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exit(1);
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}
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ret = xcalloc(1, sizeof(struct strategy));
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ret->name = xstrdup(name);
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return ret;
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}
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static void append_strategy(struct strategy *s)
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{
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ALLOC_GROW(use_strategies, use_strategies_nr + 1, use_strategies_alloc);
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use_strategies[use_strategies_nr++] = s;
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}
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static int option_parse_strategy(const struct option *opt,
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const char *name, int unset)
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{
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if (unset)
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return 0;
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append_strategy(get_strategy(name));
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return 0;
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}
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static int option_parse_n(const struct option *opt,
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const char *arg, int unset)
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{
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show_diffstat = unset;
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return 0;
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}
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static struct option builtin_merge_options[] = {
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{ OPTION_CALLBACK, 'n', NULL, NULL, NULL,
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"do not show a diffstat at the end of the merge",
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PARSE_OPT_NOARG, option_parse_n },
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OPT_BOOLEAN(0, "stat", &show_diffstat,
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"show a diffstat at the end of the merge"),
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OPT_BOOLEAN(0, "summary", &show_diffstat, "(synonym to --stat)"),
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OPT_BOOLEAN(0, "log", &option_log,
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"add list of one-line log to merge commit message"),
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OPT_BOOLEAN(0, "squash", &squash,
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"create a single commit instead of doing a merge"),
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OPT_BOOLEAN(0, "commit", &option_commit,
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"perform a commit if the merge succeeds (default)"),
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OPT_BOOLEAN(0, "ff", &allow_fast_forward,
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"allow fast forward (default)"),
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OPT_CALLBACK('s', "strategy", &use_strategies, "strategy",
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"merge strategy to use", option_parse_strategy),
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OPT_CALLBACK('m', "message", &merge_msg, "message",
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"message to be used for the merge commit (if any)",
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option_parse_message),
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OPT__VERBOSITY(&verbosity),
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OPT_END()
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};
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/* Cleans up metadata that is uninteresting after a succeeded merge. */
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static void drop_save(void)
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{
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unlink(git_path("MERGE_HEAD"));
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unlink(git_path("MERGE_MSG"));
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unlink(git_path("MERGE_MODE"));
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}
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static void save_state(void)
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{
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int len;
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struct child_process cp;
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struct strbuf buffer = STRBUF_INIT;
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const char *argv[] = {"stash", "create", NULL};
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memset(&cp, 0, sizeof(cp));
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cp.argv = argv;
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cp.out = -1;
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cp.git_cmd = 1;
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if (start_command(&cp))
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die("could not run stash.");
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len = strbuf_read(&buffer, cp.out, 1024);
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close(cp.out);
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if (finish_command(&cp) || len < 0)
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die("stash failed");
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else if (!len)
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return;
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strbuf_setlen(&buffer, buffer.len-1);
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if (get_sha1(buffer.buf, stash))
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die("not a valid object: %s", buffer.buf);
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}
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static void reset_hard(unsigned const char *sha1, int verbose)
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{
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int i = 0;
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const char *args[6];
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args[i++] = "read-tree";
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if (verbose)
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args[i++] = "-v";
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args[i++] = "--reset";
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args[i++] = "-u";
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args[i++] = sha1_to_hex(sha1);
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args[i] = NULL;
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if (run_command_v_opt(args, RUN_GIT_CMD))
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die("read-tree failed");
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}
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static void restore_state(void)
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{
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struct strbuf sb = STRBUF_INIT;
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const char *args[] = { "stash", "apply", NULL, NULL };
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if (is_null_sha1(stash))
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return;
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reset_hard(head, 1);
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args[2] = sha1_to_hex(stash);
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/*
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* It is OK to ignore error here, for example when there was
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* nothing to restore.
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*/
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run_command_v_opt(args, RUN_GIT_CMD);
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strbuf_release(&sb);
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refresh_cache(REFRESH_QUIET);
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}
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/* This is called when no merge was necessary. */
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static void finish_up_to_date(const char *msg)
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{
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if (verbosity >= 0)
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printf("%s%s\n", squash ? " (nothing to squash)" : "", msg);
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drop_save();
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}
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static void squash_message(void)
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{
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struct rev_info rev;
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struct commit *commit;
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struct strbuf out = STRBUF_INIT;
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struct commit_list *j;
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int fd;
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printf("Squash commit -- not updating HEAD\n");
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fd = open(git_path("SQUASH_MSG"), O_WRONLY | O_CREAT, 0666);
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if (fd < 0)
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die("Could not write to %s", git_path("SQUASH_MSG"));
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init_revisions(&rev, NULL);
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rev.ignore_merges = 1;
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rev.commit_format = CMIT_FMT_MEDIUM;
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commit = lookup_commit(head);
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commit->object.flags |= UNINTERESTING;
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add_pending_object(&rev, &commit->object, NULL);
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for (j = remoteheads; j; j = j->next)
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add_pending_object(&rev, &j->item->object, NULL);
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setup_revisions(0, NULL, &rev, NULL);
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if (prepare_revision_walk(&rev))
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die("revision walk setup failed");
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strbuf_addstr(&out, "Squashed commit of the following:\n");
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while ((commit = get_revision(&rev)) != NULL) {
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strbuf_addch(&out, '\n');
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strbuf_addf(&out, "commit %s\n",
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sha1_to_hex(commit->object.sha1));
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pretty_print_commit(rev.commit_format, commit, &out, rev.abbrev,
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NULL, NULL, rev.date_mode, 0);
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}
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if (write(fd, out.buf, out.len) < 0)
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die("Writing SQUASH_MSG: %s", strerror(errno));
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if (close(fd))
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die("Finishing SQUASH_MSG: %s", strerror(errno));
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strbuf_release(&out);
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}
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static void finish(const unsigned char *new_head, const char *msg)
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{
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struct strbuf reflog_message = STRBUF_INIT;
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if (!msg)
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strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION"));
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else {
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if (verbosity >= 0)
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printf("%s\n", msg);
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strbuf_addf(&reflog_message, "%s: %s",
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getenv("GIT_REFLOG_ACTION"), msg);
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}
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if (squash) {
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squash_message();
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} else {
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if (verbosity >= 0 && !merge_msg.len)
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printf("No merge message -- not updating HEAD\n");
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else {
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const char *argv_gc_auto[] = { "gc", "--auto", NULL };
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update_ref(reflog_message.buf, "HEAD",
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new_head, head, 0,
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DIE_ON_ERR);
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/*
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* We ignore errors in 'gc --auto', since the
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* user should see them.
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*/
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run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
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}
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}
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if (new_head && show_diffstat) {
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struct diff_options opts;
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diff_setup(&opts);
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opts.output_format |=
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DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
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opts.detect_rename = DIFF_DETECT_RENAME;
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if (diff_use_color_default > 0)
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DIFF_OPT_SET(&opts, COLOR_DIFF);
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if (diff_setup_done(&opts) < 0)
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die("diff_setup_done failed");
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diff_tree_sha1(head, new_head, "", &opts);
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diffcore_std(&opts);
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diff_flush(&opts);
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}
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/* Run a post-merge hook */
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run_hook(NULL, "post-merge", squash ? "1" : "0", NULL);
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strbuf_release(&reflog_message);
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}
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/* Get the name for the merge commit's message. */
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static void merge_name(const char *remote, struct strbuf *msg)
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{
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struct object *remote_head;
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unsigned char branch_head[20], buf_sha[20];
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struct strbuf buf = STRBUF_INIT;
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struct strbuf bname = STRBUF_INIT;
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const char *ptr;
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int len, early;
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strbuf_branchname(&bname, remote);
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remote = bname.buf;
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memset(branch_head, 0, sizeof(branch_head));
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remote_head = peel_to_type(remote, 0, NULL, OBJ_COMMIT);
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if (!remote_head)
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die("'%s' does not point to a commit", remote);
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strbuf_addstr(&buf, "refs/heads/");
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strbuf_addstr(&buf, remote);
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resolve_ref(buf.buf, branch_head, 0, 0);
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if (!hashcmp(remote_head->sha1, branch_head)) {
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strbuf_addf(msg, "%s\t\tbranch '%s' of .\n",
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sha1_to_hex(branch_head), remote);
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goto cleanup;
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}
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/* See if remote matches <name>^^^.. or <name>~<number> */
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for (len = 0, ptr = remote + strlen(remote);
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remote < ptr && ptr[-1] == '^';
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ptr--)
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len++;
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if (len)
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early = 1;
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else {
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early = 0;
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ptr = strrchr(remote, '~');
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if (ptr) {
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int seen_nonzero = 0;
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len++; /* count ~ */
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while (*++ptr && isdigit(*ptr)) {
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seen_nonzero |= (*ptr != '0');
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len++;
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}
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if (*ptr)
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len = 0; /* not ...~<number> */
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else if (seen_nonzero)
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early = 1;
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else if (len == 1)
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early = 1; /* "name~" is "name~1"! */
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}
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}
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if (len) {
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struct strbuf truname = STRBUF_INIT;
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strbuf_addstr(&truname, "refs/heads/");
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strbuf_addstr(&truname, remote);
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strbuf_setlen(&truname, truname.len - len);
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if (resolve_ref(truname.buf, buf_sha, 0, 0)) {
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strbuf_addf(msg,
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"%s\t\tbranch '%s'%s of .\n",
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sha1_to_hex(remote_head->sha1),
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truname.buf + 11,
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(early ? " (early part)" : ""));
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strbuf_release(&truname);
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goto cleanup;
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}
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}
|
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|
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if (!strcmp(remote, "FETCH_HEAD") &&
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!access(git_path("FETCH_HEAD"), R_OK)) {
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FILE *fp;
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struct strbuf line = STRBUF_INIT;
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char *ptr;
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|
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fp = fopen(git_path("FETCH_HEAD"), "r");
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if (!fp)
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die("could not open %s for reading: %s",
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git_path("FETCH_HEAD"), strerror(errno));
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strbuf_getline(&line, fp, '\n');
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fclose(fp);
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ptr = strstr(line.buf, "\tnot-for-merge\t");
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if (ptr)
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strbuf_remove(&line, ptr-line.buf+1, 13);
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strbuf_addbuf(msg, &line);
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strbuf_release(&line);
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goto cleanup;
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}
|
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strbuf_addf(msg, "%s\t\tcommit '%s'\n",
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sha1_to_hex(remote_head->sha1), remote);
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cleanup:
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strbuf_release(&buf);
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strbuf_release(&bname);
|
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}
|
|
|
|
static int git_merge_config(const char *k, const char *v, void *cb)
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|
{
|
|
if (branch && !prefixcmp(k, "branch.") &&
|
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!prefixcmp(k + 7, branch) &&
|
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!strcmp(k + 7 + strlen(branch), ".mergeoptions")) {
|
|
const char **argv;
|
|
int argc;
|
|
char *buf;
|
|
|
|
buf = xstrdup(v);
|
|
argc = split_cmdline(buf, &argv);
|
|
if (argc < 0)
|
|
die("Bad branch.%s.mergeoptions string", branch);
|
|
argv = xrealloc(argv, sizeof(*argv) * (argc + 2));
|
|
memmove(argv + 1, argv, sizeof(*argv) * (argc + 1));
|
|
argc++;
|
|
parse_options(argc, argv, builtin_merge_options,
|
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builtin_merge_usage, 0);
|
|
free(buf);
|
|
}
|
|
|
|
if (!strcmp(k, "merge.diffstat") || !strcmp(k, "merge.stat"))
|
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show_diffstat = git_config_bool(k, v);
|
|
else if (!strcmp(k, "pull.twohead"))
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|
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, "merge.log") || !strcmp(k, "merge.summary"))
|
|
option_log = git_config_bool(k, v);
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|
return git_diff_ui_config(k, v, cb);
|
|
}
|
|
|
|
static int read_tree_trivial(unsigned char *common, unsigned char *head,
|
|
unsigned char *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(unsigned char *sha1)
|
|
{
|
|
if (write_cache_as_tree(sha1, 0, NULL))
|
|
die("git write-tree failed to write a tree");
|
|
}
|
|
|
|
static int try_merge_strategy(const char *strategy, struct commit_list *common,
|
|
const char *head_arg)
|
|
{
|
|
const char **args;
|
|
int i = 0, ret;
|
|
struct commit_list *j;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
int index_fd;
|
|
struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
|
|
|
|
index_fd = hold_locked_index(lock, 1);
|
|
refresh_cache(REFRESH_QUIET);
|
|
if (active_cache_changed &&
|
|
(write_cache(index_fd, active_cache, active_nr) ||
|
|
commit_locked_index(lock)))
|
|
return error("Unable to write index.");
|
|
rollback_lock_file(lock);
|
|
|
|
if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) {
|
|
int clean;
|
|
struct commit *result;
|
|
struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
|
|
int index_fd;
|
|
struct commit_list *reversed = NULL;
|
|
struct merge_options o;
|
|
|
|
if (remoteheads->next) {
|
|
error("Not handling anything other than two heads merge.");
|
|
return 2;
|
|
}
|
|
|
|
init_merge_options(&o);
|
|
if (!strcmp(strategy, "subtree"))
|
|
o.subtree_merge = 1;
|
|
|
|
o.branch1 = head_arg;
|
|
o.branch2 = remoteheads->item->util;
|
|
|
|
for (j = common; j; j = j->next)
|
|
commit_list_insert(j->item, &reversed);
|
|
|
|
index_fd = hold_locked_index(lock, 1);
|
|
clean = merge_recursive(&o, lookup_commit(head),
|
|
remoteheads->item, reversed, &result);
|
|
if (active_cache_changed &&
|
|
(write_cache(index_fd, active_cache, active_nr) ||
|
|
commit_locked_index(lock)))
|
|
die ("unable to write %s", get_index_file());
|
|
rollback_lock_file(lock);
|
|
return clean ? 0 : 1;
|
|
} else {
|
|
args = xmalloc((4 + commit_list_count(common) +
|
|
commit_list_count(remoteheads)) * sizeof(char *));
|
|
strbuf_addf(&buf, "merge-%s", strategy);
|
|
args[i++] = buf.buf;
|
|
for (j = common; j; j = j->next)
|
|
args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
|
|
args[i++] = "--";
|
|
args[i++] = head_arg;
|
|
for (j = remoteheads; j; j = j->next)
|
|
args[i++] = xstrdup(sha1_to_hex(j->item->object.sha1));
|
|
args[i] = NULL;
|
|
ret = run_command_v_opt(args, RUN_GIT_CMD);
|
|
strbuf_release(&buf);
|
|
i = 1;
|
|
for (j = common; j; j = j->next)
|
|
free((void *)args[i++]);
|
|
i += 2;
|
|
for (j = remoteheads; j; j = j->next)
|
|
free((void *)args[i++]);
|
|
free(args);
|
|
discard_cache();
|
|
if (read_cache() < 0)
|
|
die("failed to read the cache");
|
|
return -ret;
|
|
}
|
|
}
|
|
|
|
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)
|
|
{
|
|
const struct index_state *state = &the_index;
|
|
int i, ret = 0;
|
|
|
|
for (i = 0; i < state->cache_nr; i++)
|
|
if (ce_stage(state->cache[i]))
|
|
ret++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int checkout_fast_forward(unsigned char *head, unsigned char *remote)
|
|
{
|
|
struct tree *trees[MAX_UNPACK_TREES];
|
|
struct unpack_trees_options opts;
|
|
struct tree_desc t[MAX_UNPACK_TREES];
|
|
int i, fd, nr_trees = 0;
|
|
struct dir_struct dir;
|
|
struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
|
|
|
|
refresh_cache(REFRESH_QUIET);
|
|
|
|
fd = hold_locked_index(lock_file, 1);
|
|
|
|
memset(&trees, 0, sizeof(trees));
|
|
memset(&opts, 0, sizeof(opts));
|
|
memset(&t, 0, sizeof(t));
|
|
memset(&dir, 0, sizeof(dir));
|
|
dir.flags |= DIR_SHOW_IGNORED;
|
|
dir.exclude_per_dir = ".gitignore";
|
|
opts.dir = &dir;
|
|
|
|
opts.head_idx = 1;
|
|
opts.src_index = &the_index;
|
|
opts.dst_index = &the_index;
|
|
opts.update = 1;
|
|
opts.verbose_update = 1;
|
|
opts.merge = 1;
|
|
opts.fn = twoway_merge;
|
|
|
|
trees[nr_trees] = parse_tree_indirect(head);
|
|
if (!trees[nr_trees++])
|
|
return -1;
|
|
trees[nr_trees] = parse_tree_indirect(remote);
|
|
if (!trees[nr_trees++])
|
|
return -1;
|
|
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;
|
|
if (write_cache(fd, active_cache, active_nr) ||
|
|
commit_locked_index(lock_file))
|
|
die("unable to write new index file");
|
|
return 0;
|
|
}
|
|
|
|
static void split_merge_strategies(const char *string, struct strategy **list,
|
|
int *nr, int *alloc)
|
|
{
|
|
char *p, *q, *buf;
|
|
|
|
if (!string)
|
|
return;
|
|
|
|
buf = xstrdup(string);
|
|
q = buf;
|
|
for (;;) {
|
|
p = strchr(q, ' ');
|
|
if (!p) {
|
|
ALLOC_GROW(*list, *nr + 1, *alloc);
|
|
(*list)[(*nr)++].name = xstrdup(q);
|
|
free(buf);
|
|
return;
|
|
} else {
|
|
*p = '\0';
|
|
ALLOC_GROW(*list, *nr + 1, *alloc);
|
|
(*list)[(*nr)++].name = xstrdup(q);
|
|
q = ++p;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void add_strategies(const char *string, unsigned attr)
|
|
{
|
|
struct strategy *list = NULL;
|
|
int list_alloc = 0, list_nr = 0, i;
|
|
|
|
memset(&list, 0, sizeof(list));
|
|
split_merge_strategies(string, &list, &list_nr, &list_alloc);
|
|
if (list) {
|
|
for (i = 0; i < list_nr; i++)
|
|
append_strategy(get_strategy(list[i].name));
|
|
return;
|
|
}
|
|
for (i = 0; i < ARRAY_SIZE(all_strategy); i++)
|
|
if (all_strategy[i].attr & attr)
|
|
append_strategy(&all_strategy[i]);
|
|
|
|
}
|
|
|
|
static int merge_trivial(void)
|
|
{
|
|
unsigned char result_tree[20], result_commit[20];
|
|
struct commit_list *parent = xmalloc(sizeof(*parent));
|
|
|
|
write_tree_trivial(result_tree);
|
|
printf("Wonderful.\n");
|
|
parent->item = lookup_commit(head);
|
|
parent->next = xmalloc(sizeof(*parent->next));
|
|
parent->next->item = remoteheads->item;
|
|
parent->next->next = NULL;
|
|
commit_tree(merge_msg.buf, result_tree, parent, result_commit, NULL);
|
|
finish(result_commit, "In-index merge");
|
|
drop_save();
|
|
return 0;
|
|
}
|
|
|
|
static int finish_automerge(struct commit_list *common,
|
|
unsigned char *result_tree,
|
|
const char *wt_strategy)
|
|
{
|
|
struct commit_list *parents = NULL, *j;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
unsigned char result_commit[20];
|
|
|
|
free_commit_list(common);
|
|
if (allow_fast_forward) {
|
|
parents = remoteheads;
|
|
commit_list_insert(lookup_commit(head), &parents);
|
|
parents = reduce_heads(parents);
|
|
} else {
|
|
struct commit_list **pptr = &parents;
|
|
|
|
pptr = &commit_list_insert(lookup_commit(head),
|
|
pptr)->next;
|
|
for (j = remoteheads; j; j = j->next)
|
|
pptr = &commit_list_insert(j->item, pptr)->next;
|
|
}
|
|
free_commit_list(remoteheads);
|
|
strbuf_addch(&merge_msg, '\n');
|
|
commit_tree(merge_msg.buf, result_tree, parents, result_commit, NULL);
|
|
strbuf_addf(&buf, "Merge made by %s.", wt_strategy);
|
|
finish(result_commit, buf.buf);
|
|
strbuf_release(&buf);
|
|
drop_save();
|
|
return 0;
|
|
}
|
|
|
|
static int suggest_conflicts(void)
|
|
{
|
|
FILE *fp;
|
|
int pos;
|
|
|
|
fp = fopen(git_path("MERGE_MSG"), "a");
|
|
if (!fp)
|
|
die("Could open %s for writing", git_path("MERGE_MSG"));
|
|
fprintf(fp, "\nConflicts:\n");
|
|
for (pos = 0; pos < active_nr; pos++) {
|
|
struct cache_entry *ce = active_cache[pos];
|
|
|
|
if (ce_stage(ce)) {
|
|
fprintf(fp, "\t%s\n", ce->name);
|
|
while (pos + 1 < active_nr &&
|
|
!strcmp(ce->name,
|
|
active_cache[pos + 1]->name))
|
|
pos++;
|
|
}
|
|
}
|
|
fclose(fp);
|
|
rerere();
|
|
printf("Automatic merge failed; "
|
|
"fix conflicts and then commit the result.\n");
|
|
return 1;
|
|
}
|
|
|
|
static struct commit *is_old_style_invocation(int argc, const char **argv)
|
|
{
|
|
struct commit *second_token = NULL;
|
|
if (argc > 1) {
|
|
unsigned char second_sha1[20];
|
|
|
|
if (get_sha1(argv[1], second_sha1))
|
|
return NULL;
|
|
second_token = lookup_commit_reference_gently(second_sha1, 0);
|
|
if (!second_token)
|
|
die("'%s' is not a commit", argv[1]);
|
|
if (hashcmp(second_token->object.sha1, head))
|
|
return NULL;
|
|
}
|
|
return second_token;
|
|
}
|
|
|
|
static int evaluate_result(void)
|
|
{
|
|
int cnt = 0;
|
|
struct rev_info rev;
|
|
|
|
/* Check how many files differ. */
|
|
init_revisions(&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;
|
|
}
|
|
|
|
int cmd_merge(int argc, const char **argv, const char *prefix)
|
|
{
|
|
unsigned char result_tree[20];
|
|
struct strbuf buf = STRBUF_INIT;
|
|
const char *head_arg;
|
|
int flag, head_invalid = 0, i;
|
|
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 **remotes = &remoteheads;
|
|
|
|
setup_work_tree();
|
|
if (read_cache_unmerged())
|
|
die("You are in the middle of a conflicted merge.");
|
|
|
|
/*
|
|
* Check if we are _not_ on a detached HEAD, i.e. if there is a
|
|
* current branch.
|
|
*/
|
|
branch = resolve_ref("HEAD", head, 0, &flag);
|
|
if (branch && !prefixcmp(branch, "refs/heads/"))
|
|
branch += 11;
|
|
if (is_null_sha1(head))
|
|
head_invalid = 1;
|
|
|
|
git_config(git_merge_config, NULL);
|
|
|
|
/* for color.ui */
|
|
if (diff_use_color_default == -1)
|
|
diff_use_color_default = git_use_color_default;
|
|
|
|
argc = parse_options(argc, argv, builtin_merge_options,
|
|
builtin_merge_usage, 0);
|
|
if (verbosity < 0)
|
|
show_diffstat = 0;
|
|
|
|
if (squash) {
|
|
if (!allow_fast_forward)
|
|
die("You cannot combine --squash with --no-ff.");
|
|
option_commit = 0;
|
|
}
|
|
|
|
if (!argc)
|
|
usage_with_options(builtin_merge_usage,
|
|
builtin_merge_options);
|
|
|
|
/*
|
|
* This could be traditional "merge <msg> HEAD <commit>..." and
|
|
* the way we can tell it is to see if the second token is HEAD,
|
|
* but some people might have misused the interface and used a
|
|
* committish that is the same as HEAD there instead.
|
|
* Traditional format never would have "-m" so it is an
|
|
* additional safety measure to check for it.
|
|
*/
|
|
|
|
if (!have_message && is_old_style_invocation(argc, argv)) {
|
|
strbuf_addstr(&merge_msg, argv[0]);
|
|
head_arg = argv[1];
|
|
argv += 2;
|
|
argc -= 2;
|
|
} else if (head_invalid) {
|
|
struct object *remote_head;
|
|
/*
|
|
* 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".
|
|
*/
|
|
if (argc != 1)
|
|
die("Can merge only exactly one commit into "
|
|
"empty head");
|
|
if (squash)
|
|
die("Squash commit into empty head not supported yet");
|
|
if (!allow_fast_forward)
|
|
die("Non-fast-forward commit does not make sense into "
|
|
"an empty head");
|
|
remote_head = peel_to_type(argv[0], 0, NULL, OBJ_COMMIT);
|
|
if (!remote_head)
|
|
die("%s - not something we can merge", argv[0]);
|
|
update_ref("initial pull", "HEAD", remote_head->sha1, NULL, 0,
|
|
DIE_ON_ERR);
|
|
reset_hard(remote_head->sha1, 0);
|
|
return 0;
|
|
} else {
|
|
struct strbuf msg = STRBUF_INIT;
|
|
|
|
/* We are invoked directly as the first-class UI. */
|
|
head_arg = "HEAD";
|
|
|
|
/*
|
|
* All the rest are the commits being merged;
|
|
* prepare the standard merge summary message to
|
|
* be appended to the given message. If remote
|
|
* is invalid we will die later in the common
|
|
* codepath so we discard the error in this
|
|
* loop.
|
|
*/
|
|
for (i = 0; i < argc; i++)
|
|
merge_name(argv[i], &msg);
|
|
fmt_merge_msg(option_log, &msg, &merge_msg);
|
|
if (merge_msg.len)
|
|
strbuf_setlen(&merge_msg, merge_msg.len-1);
|
|
}
|
|
|
|
if (head_invalid || !argc)
|
|
usage_with_options(builtin_merge_usage,
|
|
builtin_merge_options);
|
|
|
|
strbuf_addstr(&buf, "merge");
|
|
for (i = 0; i < argc; i++)
|
|
strbuf_addf(&buf, " %s", argv[i]);
|
|
setenv("GIT_REFLOG_ACTION", buf.buf, 0);
|
|
strbuf_reset(&buf);
|
|
|
|
for (i = 0; i < argc; i++) {
|
|
struct object *o;
|
|
struct commit *commit;
|
|
|
|
o = peel_to_type(argv[i], 0, NULL, OBJ_COMMIT);
|
|
if (!o)
|
|
die("%s - not something we can merge", argv[i]);
|
|
commit = lookup_commit(o->sha1);
|
|
commit->util = (void *)argv[i];
|
|
remotes = &commit_list_insert(commit, remotes)->next;
|
|
|
|
strbuf_addf(&buf, "GITHEAD_%s", sha1_to_hex(o->sha1));
|
|
setenv(buf.buf, argv[i], 1);
|
|
strbuf_reset(&buf);
|
|
}
|
|
|
|
if (!use_strategies) {
|
|
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)
|
|
allow_fast_forward = 0;
|
|
if (use_strategies[i]->attr & NO_TRIVIAL)
|
|
allow_trivial = 0;
|
|
}
|
|
|
|
if (!remoteheads->next)
|
|
common = get_merge_bases(lookup_commit(head),
|
|
remoteheads->item, 1);
|
|
else {
|
|
struct commit_list *list = remoteheads;
|
|
commit_list_insert(lookup_commit(head), &list);
|
|
common = get_octopus_merge_bases(list);
|
|
free(list);
|
|
}
|
|
|
|
update_ref("updating ORIG_HEAD", "ORIG_HEAD", head, NULL, 0,
|
|
DIE_ON_ERR);
|
|
|
|
if (!common)
|
|
; /* No common ancestors found. We need a real merge. */
|
|
else if (!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.");
|
|
return 0;
|
|
} else if (allow_fast_forward && !remoteheads->next &&
|
|
!common->next &&
|
|
!hashcmp(common->item->object.sha1, head)) {
|
|
/* Again the most common case of merging one remote. */
|
|
struct strbuf msg = STRBUF_INIT;
|
|
struct object *o;
|
|
char hex[41];
|
|
|
|
strcpy(hex, find_unique_abbrev(head, DEFAULT_ABBREV));
|
|
|
|
if (verbosity >= 0)
|
|
printf("Updating %s..%s\n",
|
|
hex,
|
|
find_unique_abbrev(remoteheads->item->object.sha1,
|
|
DEFAULT_ABBREV));
|
|
strbuf_addstr(&msg, "Fast forward");
|
|
if (have_message)
|
|
strbuf_addstr(&msg,
|
|
" (no commit created; -m option ignored)");
|
|
o = peel_to_type(sha1_to_hex(remoteheads->item->object.sha1),
|
|
0, NULL, OBJ_COMMIT);
|
|
if (!o)
|
|
return 1;
|
|
|
|
if (checkout_fast_forward(head, remoteheads->item->object.sha1))
|
|
return 1;
|
|
|
|
finish(o->sha1, msg.buf);
|
|
drop_save();
|
|
return 0;
|
|
} 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) {
|
|
/* See if it is really trivial. */
|
|
git_committer_info(IDENT_ERROR_ON_NO_NAME);
|
|
printf("Trying really trivial in-index merge...\n");
|
|
if (!read_tree_trivial(common->item->object.sha1,
|
|
head, remoteheads->item->object.sha1))
|
|
return merge_trivial();
|
|
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(lookup_commit(head),
|
|
j->item, 1);
|
|
if (hashcmp(common_one->item->object.sha1,
|
|
j->item->object.sha1)) {
|
|
up_to_date = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (up_to_date) {
|
|
finish_up_to_date("Already up-to-date. Yeeah!");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* We are going to make a new commit. */
|
|
git_committer_info(IDENT_ERROR_ON_NO_NAME);
|
|
|
|
/*
|
|
* 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();
|
|
} else {
|
|
memcpy(stash, null_sha1, 20);
|
|
}
|
|
|
|
for (i = 0; i < use_strategies_nr; i++) {
|
|
int ret;
|
|
if (i) {
|
|
printf("Rewinding the tree to pristine...\n");
|
|
restore_state();
|
|
}
|
|
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, head_arg);
|
|
if (!option_commit && !ret) {
|
|
merge_was_ok = 1;
|
|
/*
|
|
* This is necessary here just to avoid writing
|
|
* the tree, but later we will *not* exit with
|
|
* status code 1 because merge_was_ok is set.
|
|
*/
|
|
ret = 1;
|
|
}
|
|
|
|
if (ret) {
|
|
/*
|
|
* 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 == 1) {
|
|
int cnt = evaluate_result();
|
|
|
|
if (best_cnt <= 0 || cnt <= best_cnt) {
|
|
best_strategy = use_strategies[i]->name;
|
|
best_cnt = cnt;
|
|
}
|
|
}
|
|
if (merge_was_ok)
|
|
break;
|
|
else
|
|
continue;
|
|
}
|
|
|
|
/* Automerge succeeded. */
|
|
write_tree_trivial(result_tree);
|
|
automerge_was_ok = 1;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If we have a resulting tree, that means the strategy module
|
|
* auto resolved the merge cleanly.
|
|
*/
|
|
if (automerge_was_ok)
|
|
return finish_automerge(common, result_tree, wt_strategy);
|
|
|
|
/*
|
|
* Pick the result from the best strategy and have the user fix
|
|
* it up.
|
|
*/
|
|
if (!best_strategy) {
|
|
restore_state();
|
|
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);
|
|
return 2;
|
|
} 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();
|
|
printf("Using the %s to prepare resolving by hand.\n",
|
|
best_strategy);
|
|
try_merge_strategy(best_strategy, common, head_arg);
|
|
}
|
|
|
|
if (squash)
|
|
finish(NULL, NULL);
|
|
else {
|
|
int fd;
|
|
struct commit_list *j;
|
|
|
|
for (j = remoteheads; j; j = j->next)
|
|
strbuf_addf(&buf, "%s\n",
|
|
sha1_to_hex(j->item->object.sha1));
|
|
fd = open(git_path("MERGE_HEAD"), O_WRONLY | O_CREAT, 0666);
|
|
if (fd < 0)
|
|
die("Could open %s for writing",
|
|
git_path("MERGE_HEAD"));
|
|
if (write_in_full(fd, buf.buf, buf.len) != buf.len)
|
|
die("Could not write to %s", git_path("MERGE_HEAD"));
|
|
close(fd);
|
|
strbuf_addch(&merge_msg, '\n');
|
|
fd = open(git_path("MERGE_MSG"), O_WRONLY | O_CREAT, 0666);
|
|
if (fd < 0)
|
|
die("Could open %s for writing", git_path("MERGE_MSG"));
|
|
if (write_in_full(fd, merge_msg.buf, merge_msg.len) !=
|
|
merge_msg.len)
|
|
die("Could not write to %s", git_path("MERGE_MSG"));
|
|
close(fd);
|
|
fd = open(git_path("MERGE_MODE"), O_WRONLY | O_CREAT | O_TRUNC, 0666);
|
|
if (fd < 0)
|
|
die("Could open %s for writing", git_path("MERGE_MODE"));
|
|
strbuf_reset(&buf);
|
|
if (!allow_fast_forward)
|
|
strbuf_addf(&buf, "no-ff");
|
|
if (write_in_full(fd, buf.buf, buf.len) != buf.len)
|
|
die("Could not write to %s", git_path("MERGE_MODE"));
|
|
close(fd);
|
|
}
|
|
|
|
if (merge_was_ok) {
|
|
fprintf(stderr, "Automatic merge went well; "
|
|
"stopped before committing as requested\n");
|
|
return 0;
|
|
} else
|
|
return suggest_conflicts();
|
|
}
|