mirror of
https://github.com/git/git
synced 2024-08-28 12:09:19 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
* nd/const-struct-cache-entry: Convert "struct cache_entry *" to "const ..." wherever possible
1573 lines
42 KiB
C
1573 lines
42 KiB
C
/*
|
|
* Builtin "git merge"
|
|
*
|
|
* Copyright (c) 2008 Miklos Vajna <vmiklos@frugalware.org>
|
|
*
|
|
* Based on git-merge.sh by Junio C Hamano.
|
|
*/
|
|
|
|
#include "cache.h"
|
|
#include "parse-options.h"
|
|
#include "builtin.h"
|
|
#include "run-command.h"
|
|
#include "diff.h"
|
|
#include "refs.h"
|
|
#include "commit.h"
|
|
#include "diffcore.h"
|
|
#include "revision.h"
|
|
#include "unpack-trees.h"
|
|
#include "cache-tree.h"
|
|
#include "dir.h"
|
|
#include "utf8.h"
|
|
#include "log-tree.h"
|
|
#include "color.h"
|
|
#include "rerere.h"
|
|
#include "help.h"
|
|
#include "merge-recursive.h"
|
|
#include "resolve-undo.h"
|
|
#include "remote.h"
|
|
#include "fmt-merge-msg.h"
|
|
#include "gpg-interface.h"
|
|
|
|
#define DEFAULT_TWOHEAD (1<<0)
|
|
#define DEFAULT_OCTOPUS (1<<1)
|
|
#define NO_FAST_FORWARD (1<<2)
|
|
#define NO_TRIVIAL (1<<3)
|
|
|
|
struct strategy {
|
|
const char *name;
|
|
unsigned attr;
|
|
};
|
|
|
|
static const char * const builtin_merge_usage[] = {
|
|
N_("git merge [options] [<commit>...]"),
|
|
N_("git merge [options] <msg> HEAD <commit>"),
|
|
N_("git merge --abort"),
|
|
NULL
|
|
};
|
|
|
|
static int show_diffstat = 1, shortlog_len = -1, squash;
|
|
static int option_commit = 1;
|
|
static int option_edit = -1;
|
|
static int allow_trivial = 1, have_message, verify_signatures;
|
|
static int overwrite_ignore = 1;
|
|
static struct strbuf merge_msg = STRBUF_INIT;
|
|
static struct strategy **use_strategies;
|
|
static size_t use_strategies_nr, use_strategies_alloc;
|
|
static const char **xopts;
|
|
static size_t xopts_nr, xopts_alloc;
|
|
static const char *branch;
|
|
static char *branch_mergeoptions;
|
|
static int option_renormalize;
|
|
static int verbosity;
|
|
static int allow_rerere_auto;
|
|
static int abort_current_merge;
|
|
static int show_progress = -1;
|
|
static int default_to_upstream;
|
|
static const char *sign_commit;
|
|
|
|
static struct strategy all_strategy[] = {
|
|
{ "recursive", DEFAULT_TWOHEAD | NO_TRIVIAL },
|
|
{ "octopus", DEFAULT_OCTOPUS },
|
|
{ "resolve", 0 },
|
|
{ "ours", NO_FAST_FORWARD | NO_TRIVIAL },
|
|
{ "subtree", NO_FAST_FORWARD | NO_TRIVIAL },
|
|
};
|
|
|
|
static const char *pull_twohead, *pull_octopus;
|
|
|
|
enum ff_type {
|
|
FF_NO,
|
|
FF_ALLOW,
|
|
FF_ONLY
|
|
};
|
|
|
|
static enum ff_type fast_forward = FF_ALLOW;
|
|
|
|
static int option_parse_message(const struct option *opt,
|
|
const char *arg, int unset)
|
|
{
|
|
struct strbuf *buf = opt->value;
|
|
|
|
if (unset)
|
|
strbuf_setlen(buf, 0);
|
|
else if (arg) {
|
|
strbuf_addf(buf, "%s%s", buf->len ? "\n\n" : "", arg);
|
|
have_message = 1;
|
|
} else
|
|
return error(_("switch `m' requires a value"));
|
|
return 0;
|
|
}
|
|
|
|
static struct strategy *get_strategy(const char *name)
|
|
{
|
|
int i;
|
|
struct strategy *ret;
|
|
static struct cmdnames main_cmds, other_cmds;
|
|
static int loaded;
|
|
|
|
if (!name)
|
|
return NULL;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(all_strategy); i++)
|
|
if (!strcmp(name, all_strategy[i].name))
|
|
return &all_strategy[i];
|
|
|
|
if (!loaded) {
|
|
struct cmdnames not_strategies;
|
|
loaded = 1;
|
|
|
|
memset(¬_strategies, 0, sizeof(struct cmdnames));
|
|
load_command_list("git-merge-", &main_cmds, &other_cmds);
|
|
for (i = 0; i < main_cmds.cnt; i++) {
|
|
int j, found = 0;
|
|
struct cmdname *ent = main_cmds.names[i];
|
|
for (j = 0; j < ARRAY_SIZE(all_strategy); j++)
|
|
if (!strncmp(ent->name, all_strategy[j].name, ent->len)
|
|
&& !all_strategy[j].name[ent->len])
|
|
found = 1;
|
|
if (!found)
|
|
add_cmdname(¬_strategies, ent->name, ent->len);
|
|
}
|
|
exclude_cmds(&main_cmds, ¬_strategies);
|
|
}
|
|
if (!is_in_cmdlist(&main_cmds, name) && !is_in_cmdlist(&other_cmds, name)) {
|
|
fprintf(stderr, _("Could not find merge strategy '%s'.\n"), name);
|
|
fprintf(stderr, _("Available strategies are:"));
|
|
for (i = 0; i < main_cmds.cnt; i++)
|
|
fprintf(stderr, " %s", main_cmds.names[i]->name);
|
|
fprintf(stderr, ".\n");
|
|
if (other_cmds.cnt) {
|
|
fprintf(stderr, _("Available custom strategies are:"));
|
|
for (i = 0; i < other_cmds.cnt; i++)
|
|
fprintf(stderr, " %s", other_cmds.names[i]->name);
|
|
fprintf(stderr, ".\n");
|
|
}
|
|
exit(1);
|
|
}
|
|
|
|
ret = xcalloc(1, sizeof(struct strategy));
|
|
ret->name = xstrdup(name);
|
|
ret->attr = NO_TRIVIAL;
|
|
return ret;
|
|
}
|
|
|
|
static void append_strategy(struct strategy *s)
|
|
{
|
|
ALLOC_GROW(use_strategies, use_strategies_nr + 1, use_strategies_alloc);
|
|
use_strategies[use_strategies_nr++] = s;
|
|
}
|
|
|
|
static int option_parse_strategy(const struct option *opt,
|
|
const char *name, int unset)
|
|
{
|
|
if (unset)
|
|
return 0;
|
|
|
|
append_strategy(get_strategy(name));
|
|
return 0;
|
|
}
|
|
|
|
static int option_parse_x(const struct option *opt,
|
|
const char *arg, int unset)
|
|
{
|
|
if (unset)
|
|
return 0;
|
|
|
|
ALLOC_GROW(xopts, xopts_nr + 1, xopts_alloc);
|
|
xopts[xopts_nr++] = xstrdup(arg);
|
|
return 0;
|
|
}
|
|
|
|
static int option_parse_n(const struct option *opt,
|
|
const char *arg, int unset)
|
|
{
|
|
show_diffstat = unset;
|
|
return 0;
|
|
}
|
|
|
|
static int option_parse_ff_only(const struct option *opt,
|
|
const char *arg, int unset)
|
|
{
|
|
fast_forward = FF_ONLY;
|
|
return 0;
|
|
}
|
|
|
|
static struct option builtin_merge_options[] = {
|
|
{ OPTION_CALLBACK, 'n', NULL, NULL, NULL,
|
|
N_("do not show a diffstat at the end of the merge"),
|
|
PARSE_OPT_NOARG, option_parse_n },
|
|
OPT_BOOLEAN(0, "stat", &show_diffstat,
|
|
N_("show a diffstat at the end of the merge")),
|
|
OPT_BOOLEAN(0, "summary", &show_diffstat, N_("(synonym to --stat)")),
|
|
{ OPTION_INTEGER, 0, "log", &shortlog_len, N_("n"),
|
|
N_("add (at most <n>) entries from shortlog to merge commit message"),
|
|
PARSE_OPT_OPTARG, NULL, DEFAULT_MERGE_LOG_LEN },
|
|
OPT_BOOLEAN(0, "squash", &squash,
|
|
N_("create a single commit instead of doing a merge")),
|
|
OPT_BOOLEAN(0, "commit", &option_commit,
|
|
N_("perform a commit if the merge succeeds (default)")),
|
|
OPT_BOOL('e', "edit", &option_edit,
|
|
N_("edit message before committing")),
|
|
OPT_SET_INT(0, "ff", &fast_forward, N_("allow fast-forward (default)"), FF_ALLOW),
|
|
{ OPTION_CALLBACK, 0, "ff-only", NULL, NULL,
|
|
N_("abort if fast-forward is not possible"),
|
|
PARSE_OPT_NOARG | PARSE_OPT_NONEG, option_parse_ff_only },
|
|
OPT_RERERE_AUTOUPDATE(&allow_rerere_auto),
|
|
OPT_BOOL(0, "verify-signatures", &verify_signatures,
|
|
N_("Verify that the named commit has a valid GPG signature")),
|
|
OPT_CALLBACK('s', "strategy", &use_strategies, N_("strategy"),
|
|
N_("merge strategy to use"), option_parse_strategy),
|
|
OPT_CALLBACK('X', "strategy-option", &xopts, N_("option=value"),
|
|
N_("option for selected merge strategy"), option_parse_x),
|
|
OPT_CALLBACK('m', "message", &merge_msg, N_("message"),
|
|
N_("merge commit message (for a non-fast-forward merge)"),
|
|
option_parse_message),
|
|
OPT__VERBOSITY(&verbosity),
|
|
OPT_BOOLEAN(0, "abort", &abort_current_merge,
|
|
N_("abort the current in-progress merge")),
|
|
OPT_SET_INT(0, "progress", &show_progress, N_("force progress reporting"), 1),
|
|
{ OPTION_STRING, 'S', "gpg-sign", &sign_commit, N_("key id"),
|
|
N_("GPG sign commit"), PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
|
|
OPT_BOOLEAN(0, "overwrite-ignore", &overwrite_ignore, N_("update ignored files (default)")),
|
|
OPT_END()
|
|
};
|
|
|
|
/* Cleans up metadata that is uninteresting after a succeeded merge. */
|
|
static void drop_save(void)
|
|
{
|
|
unlink(git_path("MERGE_HEAD"));
|
|
unlink(git_path("MERGE_MSG"));
|
|
unlink(git_path("MERGE_MODE"));
|
|
}
|
|
|
|
static int save_state(unsigned char *stash)
|
|
{
|
|
int len;
|
|
struct child_process cp;
|
|
struct strbuf buffer = STRBUF_INIT;
|
|
const char *argv[] = {"stash", "create", NULL};
|
|
|
|
memset(&cp, 0, sizeof(cp));
|
|
cp.argv = argv;
|
|
cp.out = -1;
|
|
cp.git_cmd = 1;
|
|
|
|
if (start_command(&cp))
|
|
die(_("could not run stash."));
|
|
len = strbuf_read(&buffer, cp.out, 1024);
|
|
close(cp.out);
|
|
|
|
if (finish_command(&cp) || len < 0)
|
|
die(_("stash failed"));
|
|
else if (!len) /* no changes */
|
|
return -1;
|
|
strbuf_setlen(&buffer, buffer.len-1);
|
|
if (get_sha1(buffer.buf, stash))
|
|
die(_("not a valid object: %s"), buffer.buf);
|
|
return 0;
|
|
}
|
|
|
|
static void read_empty(unsigned const char *sha1, int verbose)
|
|
{
|
|
int i = 0;
|
|
const char *args[7];
|
|
|
|
args[i++] = "read-tree";
|
|
if (verbose)
|
|
args[i++] = "-v";
|
|
args[i++] = "-m";
|
|
args[i++] = "-u";
|
|
args[i++] = EMPTY_TREE_SHA1_HEX;
|
|
args[i++] = sha1_to_hex(sha1);
|
|
args[i] = NULL;
|
|
|
|
if (run_command_v_opt(args, RUN_GIT_CMD))
|
|
die(_("read-tree failed"));
|
|
}
|
|
|
|
static void reset_hard(unsigned const char *sha1, int verbose)
|
|
{
|
|
int i = 0;
|
|
const char *args[6];
|
|
|
|
args[i++] = "read-tree";
|
|
if (verbose)
|
|
args[i++] = "-v";
|
|
args[i++] = "--reset";
|
|
args[i++] = "-u";
|
|
args[i++] = sha1_to_hex(sha1);
|
|
args[i] = NULL;
|
|
|
|
if (run_command_v_opt(args, RUN_GIT_CMD))
|
|
die(_("read-tree failed"));
|
|
}
|
|
|
|
static void restore_state(const unsigned char *head,
|
|
const unsigned char *stash)
|
|
{
|
|
struct strbuf sb = STRBUF_INIT;
|
|
const char *args[] = { "stash", "apply", NULL, NULL };
|
|
|
|
if (is_null_sha1(stash))
|
|
return;
|
|
|
|
reset_hard(head, 1);
|
|
|
|
args[2] = sha1_to_hex(stash);
|
|
|
|
/*
|
|
* It is OK to ignore error here, for example when there was
|
|
* nothing to restore.
|
|
*/
|
|
run_command_v_opt(args, RUN_GIT_CMD);
|
|
|
|
strbuf_release(&sb);
|
|
refresh_cache(REFRESH_QUIET);
|
|
}
|
|
|
|
/* This is called when no merge was necessary. */
|
|
static void finish_up_to_date(const char *msg)
|
|
{
|
|
if (verbosity >= 0)
|
|
printf("%s%s\n", squash ? _(" (nothing to squash)") : "", msg);
|
|
drop_save();
|
|
}
|
|
|
|
static void squash_message(struct commit *commit, struct commit_list *remoteheads)
|
|
{
|
|
struct rev_info rev;
|
|
struct strbuf out = STRBUF_INIT;
|
|
struct commit_list *j;
|
|
const char *filename;
|
|
int fd;
|
|
struct pretty_print_context ctx = {0};
|
|
|
|
printf(_("Squash commit -- not updating HEAD\n"));
|
|
filename = git_path("SQUASH_MSG");
|
|
fd = open(filename, O_WRONLY | O_CREAT, 0666);
|
|
if (fd < 0)
|
|
die_errno(_("Could not write to '%s'"), filename);
|
|
|
|
init_revisions(&rev, NULL);
|
|
rev.ignore_merges = 1;
|
|
rev.commit_format = CMIT_FMT_MEDIUM;
|
|
|
|
commit->object.flags |= UNINTERESTING;
|
|
add_pending_object(&rev, &commit->object, NULL);
|
|
|
|
for (j = remoteheads; j; j = j->next)
|
|
add_pending_object(&rev, &j->item->object, NULL);
|
|
|
|
setup_revisions(0, NULL, &rev, NULL);
|
|
if (prepare_revision_walk(&rev))
|
|
die(_("revision walk setup failed"));
|
|
|
|
ctx.abbrev = rev.abbrev;
|
|
ctx.date_mode = rev.date_mode;
|
|
ctx.fmt = rev.commit_format;
|
|
|
|
strbuf_addstr(&out, "Squashed commit of the following:\n");
|
|
while ((commit = get_revision(&rev)) != NULL) {
|
|
strbuf_addch(&out, '\n');
|
|
strbuf_addf(&out, "commit %s\n",
|
|
sha1_to_hex(commit->object.sha1));
|
|
pretty_print_commit(&ctx, commit, &out);
|
|
}
|
|
if (write(fd, out.buf, out.len) < 0)
|
|
die_errno(_("Writing SQUASH_MSG"));
|
|
if (close(fd))
|
|
die_errno(_("Finishing SQUASH_MSG"));
|
|
strbuf_release(&out);
|
|
}
|
|
|
|
static void finish(struct commit *head_commit,
|
|
struct commit_list *remoteheads,
|
|
const unsigned char *new_head, const char *msg)
|
|
{
|
|
struct strbuf reflog_message = STRBUF_INIT;
|
|
const unsigned char *head = head_commit->object.sha1;
|
|
|
|
if (!msg)
|
|
strbuf_addstr(&reflog_message, getenv("GIT_REFLOG_ACTION"));
|
|
else {
|
|
if (verbosity >= 0)
|
|
printf("%s\n", msg);
|
|
strbuf_addf(&reflog_message, "%s: %s",
|
|
getenv("GIT_REFLOG_ACTION"), msg);
|
|
}
|
|
if (squash) {
|
|
squash_message(head_commit, remoteheads);
|
|
} else {
|
|
if (verbosity >= 0 && !merge_msg.len)
|
|
printf(_("No merge message -- not updating HEAD\n"));
|
|
else {
|
|
const char *argv_gc_auto[] = { "gc", "--auto", NULL };
|
|
update_ref(reflog_message.buf, "HEAD",
|
|
new_head, head, 0,
|
|
DIE_ON_ERR);
|
|
/*
|
|
* We ignore errors in 'gc --auto', since the
|
|
* user should see them.
|
|
*/
|
|
run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
|
|
}
|
|
}
|
|
if (new_head && show_diffstat) {
|
|
struct diff_options opts;
|
|
diff_setup(&opts);
|
|
opts.stat_width = -1; /* use full terminal width */
|
|
opts.stat_graph_width = -1; /* respect statGraphWidth config */
|
|
opts.output_format |=
|
|
DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
|
|
opts.detect_rename = DIFF_DETECT_RENAME;
|
|
diff_setup_done(&opts);
|
|
diff_tree_sha1(head, new_head, "", &opts);
|
|
diffcore_std(&opts);
|
|
diff_flush(&opts);
|
|
}
|
|
|
|
/* Run a post-merge hook */
|
|
run_hook(NULL, "post-merge", squash ? "1" : "0", NULL);
|
|
|
|
strbuf_release(&reflog_message);
|
|
}
|
|
|
|
/* Get the name for the merge commit's message. */
|
|
static void merge_name(const char *remote, struct strbuf *msg)
|
|
{
|
|
struct commit *remote_head;
|
|
unsigned char branch_head[20];
|
|
struct strbuf buf = STRBUF_INIT;
|
|
struct strbuf bname = STRBUF_INIT;
|
|
const char *ptr;
|
|
char *found_ref;
|
|
int len, early;
|
|
|
|
strbuf_branchname(&bname, remote);
|
|
remote = bname.buf;
|
|
|
|
memset(branch_head, 0, sizeof(branch_head));
|
|
remote_head = get_merge_parent(remote);
|
|
if (!remote_head)
|
|
die(_("'%s' does not point to a commit"), remote);
|
|
|
|
if (dwim_ref(remote, strlen(remote), branch_head, &found_ref) > 0) {
|
|
if (!prefixcmp(found_ref, "refs/heads/")) {
|
|
strbuf_addf(msg, "%s\t\tbranch '%s' of .\n",
|
|
sha1_to_hex(branch_head), remote);
|
|
goto cleanup;
|
|
}
|
|
if (!prefixcmp(found_ref, "refs/tags/")) {
|
|
strbuf_addf(msg, "%s\t\ttag '%s' of .\n",
|
|
sha1_to_hex(branch_head), remote);
|
|
goto cleanup;
|
|
}
|
|
if (!prefixcmp(found_ref, "refs/remotes/")) {
|
|
strbuf_addf(msg, "%s\t\tremote-tracking branch '%s' of .\n",
|
|
sha1_to_hex(branch_head), remote);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
/* See if remote matches <name>^^^.. or <name>~<number> */
|
|
for (len = 0, ptr = remote + strlen(remote);
|
|
remote < ptr && ptr[-1] == '^';
|
|
ptr--)
|
|
len++;
|
|
if (len)
|
|
early = 1;
|
|
else {
|
|
early = 0;
|
|
ptr = strrchr(remote, '~');
|
|
if (ptr) {
|
|
int seen_nonzero = 0;
|
|
|
|
len++; /* count ~ */
|
|
while (*++ptr && isdigit(*ptr)) {
|
|
seen_nonzero |= (*ptr != '0');
|
|
len++;
|
|
}
|
|
if (*ptr)
|
|
len = 0; /* not ...~<number> */
|
|
else if (seen_nonzero)
|
|
early = 1;
|
|
else if (len == 1)
|
|
early = 1; /* "name~" is "name~1"! */
|
|
}
|
|
}
|
|
if (len) {
|
|
struct strbuf truname = STRBUF_INIT;
|
|
strbuf_addstr(&truname, "refs/heads/");
|
|
strbuf_addstr(&truname, remote);
|
|
strbuf_setlen(&truname, truname.len - len);
|
|
if (ref_exists(truname.buf)) {
|
|
strbuf_addf(msg,
|
|
"%s\t\tbranch '%s'%s of .\n",
|
|
sha1_to_hex(remote_head->object.sha1),
|
|
truname.buf + 11,
|
|
(early ? " (early part)" : ""));
|
|
strbuf_release(&truname);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
if (!strcmp(remote, "FETCH_HEAD") &&
|
|
!access(git_path("FETCH_HEAD"), R_OK)) {
|
|
const char *filename;
|
|
FILE *fp;
|
|
struct strbuf line = STRBUF_INIT;
|
|
char *ptr;
|
|
|
|
filename = git_path("FETCH_HEAD");
|
|
fp = fopen(filename, "r");
|
|
if (!fp)
|
|
die_errno(_("could not open '%s' for reading"),
|
|
filename);
|
|
strbuf_getline(&line, fp, '\n');
|
|
fclose(fp);
|
|
ptr = strstr(line.buf, "\tnot-for-merge\t");
|
|
if (ptr)
|
|
strbuf_remove(&line, ptr-line.buf+1, 13);
|
|
strbuf_addbuf(msg, &line);
|
|
strbuf_release(&line);
|
|
goto cleanup;
|
|
}
|
|
|
|
if (remote_head->util) {
|
|
struct merge_remote_desc *desc;
|
|
desc = merge_remote_util(remote_head);
|
|
if (desc && desc->obj && desc->obj->type == OBJ_TAG) {
|
|
strbuf_addf(msg, "%s\t\t%s '%s'\n",
|
|
sha1_to_hex(desc->obj->sha1),
|
|
typename(desc->obj->type),
|
|
remote);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
strbuf_addf(msg, "%s\t\tcommit '%s'\n",
|
|
sha1_to_hex(remote_head->object.sha1), remote);
|
|
cleanup:
|
|
strbuf_release(&buf);
|
|
strbuf_release(&bname);
|
|
}
|
|
|
|
static void parse_branch_merge_options(char *bmo)
|
|
{
|
|
const char **argv;
|
|
int argc;
|
|
|
|
if (!bmo)
|
|
return;
|
|
argc = split_cmdline(bmo, &argv);
|
|
if (argc < 0)
|
|
die(_("Bad branch.%s.mergeoptions string: %s"), branch,
|
|
split_cmdline_strerror(argc));
|
|
argv = xrealloc(argv, sizeof(*argv) * (argc + 2));
|
|
memmove(argv + 1, argv, sizeof(*argv) * (argc + 1));
|
|
argc++;
|
|
argv[0] = "branch.*.mergeoptions";
|
|
parse_options(argc, argv, NULL, builtin_merge_options,
|
|
builtin_merge_usage, 0);
|
|
free(argv);
|
|
}
|
|
|
|
static int git_merge_config(const char *k, const char *v, void *cb)
|
|
{
|
|
int status;
|
|
|
|
if (branch && !prefixcmp(k, "branch.") &&
|
|
!prefixcmp(k + 7, branch) &&
|
|
!strcmp(k + 7 + strlen(branch), ".mergeoptions")) {
|
|
free(branch_mergeoptions);
|
|
branch_mergeoptions = xstrdup(v);
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(k, "merge.diffstat") || !strcmp(k, "merge.stat"))
|
|
show_diffstat = git_config_bool(k, v);
|
|
else if (!strcmp(k, "pull.twohead"))
|
|
return git_config_string(&pull_twohead, k, v);
|
|
else if (!strcmp(k, "pull.octopus"))
|
|
return git_config_string(&pull_octopus, k, v);
|
|
else if (!strcmp(k, "merge.renormalize"))
|
|
option_renormalize = git_config_bool(k, v);
|
|
else if (!strcmp(k, "merge.ff")) {
|
|
int boolval = git_config_maybe_bool(k, v);
|
|
if (0 <= boolval) {
|
|
fast_forward = boolval ? FF_ALLOW : FF_NO;
|
|
} else if (v && !strcmp(v, "only")) {
|
|
fast_forward = FF_ONLY;
|
|
} /* do not barf on values from future versions of git */
|
|
return 0;
|
|
} else if (!strcmp(k, "merge.defaulttoupstream")) {
|
|
default_to_upstream = git_config_bool(k, v);
|
|
return 0;
|
|
}
|
|
|
|
status = fmt_merge_msg_config(k, v, cb);
|
|
if (status)
|
|
return status;
|
|
status = git_gpg_config(k, v, NULL);
|
|
if (status)
|
|
return status;
|
|
return git_diff_ui_config(k, v, cb);
|
|
}
|
|
|
|
static int read_tree_trivial(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,
|
|
struct commit_list *remoteheads,
|
|
struct commit *head, const char *head_arg)
|
|
{
|
|
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, x;
|
|
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;
|
|
struct commit_list *j;
|
|
|
|
if (remoteheads->next) {
|
|
error(_("Not handling anything other than two heads merge."));
|
|
return 2;
|
|
}
|
|
|
|
init_merge_options(&o);
|
|
if (!strcmp(strategy, "subtree"))
|
|
o.subtree_shift = "";
|
|
|
|
o.renormalize = option_renormalize;
|
|
o.show_rename_progress =
|
|
show_progress == -1 ? isatty(2) : show_progress;
|
|
|
|
for (x = 0; x < xopts_nr; x++)
|
|
if (parse_merge_opt(&o, xopts[x]))
|
|
die(_("Unknown option for merge-recursive: -X%s"), xopts[x]);
|
|
|
|
o.branch1 = head_arg;
|
|
o.branch2 = merge_remote_util(remoteheads->item)->name;
|
|
|
|
for (j = common; j; j = j->next)
|
|
commit_list_insert(j->item, &reversed);
|
|
|
|
index_fd = hold_locked_index(lock, 1);
|
|
clean = merge_recursive(&o, 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 {
|
|
return try_merge_command(strategy, xopts_nr, xopts,
|
|
common, head_arg, remoteheads);
|
|
}
|
|
}
|
|
|
|
static void count_diff_files(struct diff_queue_struct *q,
|
|
struct diff_options *opt, void *data)
|
|
{
|
|
int *count = data;
|
|
|
|
(*count) += q->nr;
|
|
}
|
|
|
|
static int count_unmerged_entries(void)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
for (i = 0; i < active_nr; i++)
|
|
if (ce_stage(active_cache[i]))
|
|
ret++;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void 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 void write_merge_msg(struct strbuf *msg)
|
|
{
|
|
const char *filename = git_path("MERGE_MSG");
|
|
int fd = open(filename, O_WRONLY | O_CREAT, 0666);
|
|
if (fd < 0)
|
|
die_errno(_("Could not open '%s' for writing"),
|
|
filename);
|
|
if (write_in_full(fd, msg->buf, msg->len) != msg->len)
|
|
die_errno(_("Could not write to '%s'"), filename);
|
|
close(fd);
|
|
}
|
|
|
|
static void read_merge_msg(struct strbuf *msg)
|
|
{
|
|
const char *filename = git_path("MERGE_MSG");
|
|
strbuf_reset(msg);
|
|
if (strbuf_read_file(msg, filename, 0) < 0)
|
|
die_errno(_("Could not read from '%s'"), filename);
|
|
}
|
|
|
|
static void write_merge_state(struct commit_list *);
|
|
static void abort_commit(struct commit_list *remoteheads, const char *err_msg)
|
|
{
|
|
if (err_msg)
|
|
error("%s", err_msg);
|
|
fprintf(stderr,
|
|
_("Not committing merge; use 'git commit' to complete the merge.\n"));
|
|
write_merge_state(remoteheads);
|
|
exit(1);
|
|
}
|
|
|
|
static const char merge_editor_comment[] =
|
|
N_("Please enter a commit message to explain why this merge is necessary,\n"
|
|
"especially if it merges an updated upstream into a topic branch.\n"
|
|
"\n"
|
|
"Lines starting with '%c' will be ignored, and an empty message aborts\n"
|
|
"the commit.\n");
|
|
|
|
static void prepare_to_commit(struct commit_list *remoteheads)
|
|
{
|
|
struct strbuf msg = STRBUF_INIT;
|
|
strbuf_addbuf(&msg, &merge_msg);
|
|
strbuf_addch(&msg, '\n');
|
|
if (0 < option_edit)
|
|
strbuf_commented_addf(&msg, _(merge_editor_comment), comment_line_char);
|
|
write_merge_msg(&msg);
|
|
if (run_hook(get_index_file(), "prepare-commit-msg",
|
|
git_path("MERGE_MSG"), "merge", NULL, NULL))
|
|
abort_commit(remoteheads, NULL);
|
|
if (0 < option_edit) {
|
|
if (launch_editor(git_path("MERGE_MSG"), NULL, NULL))
|
|
abort_commit(remoteheads, NULL);
|
|
}
|
|
read_merge_msg(&msg);
|
|
stripspace(&msg, 0 < option_edit);
|
|
if (!msg.len)
|
|
abort_commit(remoteheads, _("Empty commit message."));
|
|
strbuf_release(&merge_msg);
|
|
strbuf_addbuf(&merge_msg, &msg);
|
|
strbuf_release(&msg);
|
|
}
|
|
|
|
static int merge_trivial(struct commit *head, struct commit_list *remoteheads)
|
|
{
|
|
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 = head;
|
|
parent->next = xmalloc(sizeof(*parent->next));
|
|
parent->next->item = remoteheads->item;
|
|
parent->next->next = NULL;
|
|
prepare_to_commit(remoteheads);
|
|
if (commit_tree(&merge_msg, result_tree, parent, result_commit, NULL,
|
|
sign_commit))
|
|
die(_("failed to write commit object"));
|
|
finish(head, remoteheads, result_commit, "In-index merge");
|
|
drop_save();
|
|
return 0;
|
|
}
|
|
|
|
static int finish_automerge(struct commit *head,
|
|
int head_subsumed,
|
|
struct commit_list *common,
|
|
struct commit_list *remoteheads,
|
|
unsigned char *result_tree,
|
|
const char *wt_strategy)
|
|
{
|
|
struct commit_list *parents = NULL;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
unsigned char result_commit[20];
|
|
|
|
free_commit_list(common);
|
|
parents = remoteheads;
|
|
if (!head_subsumed || fast_forward == FF_NO)
|
|
commit_list_insert(head, &parents);
|
|
strbuf_addch(&merge_msg, '\n');
|
|
prepare_to_commit(remoteheads);
|
|
if (commit_tree(&merge_msg, result_tree, parents, result_commit,
|
|
NULL, sign_commit))
|
|
die(_("failed to write commit object"));
|
|
strbuf_addf(&buf, "Merge made by the '%s' strategy.", wt_strategy);
|
|
finish(head, remoteheads, result_commit, buf.buf);
|
|
strbuf_release(&buf);
|
|
drop_save();
|
|
return 0;
|
|
}
|
|
|
|
static int suggest_conflicts(int renormalizing)
|
|
{
|
|
const char *filename;
|
|
FILE *fp;
|
|
int pos;
|
|
|
|
filename = git_path("MERGE_MSG");
|
|
fp = fopen(filename, "a");
|
|
if (!fp)
|
|
die_errno(_("Could not open '%s' for writing"), filename);
|
|
fprintf(fp, "\nConflicts:\n");
|
|
for (pos = 0; pos < active_nr; pos++) {
|
|
const 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(allow_rerere_auto);
|
|
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,
|
|
const unsigned char *head)
|
|
{
|
|
struct commit *second_token = NULL;
|
|
if (argc > 2) {
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Pretend as if the user told us to merge with the remote-tracking
|
|
* branch we have for the upstream of the current branch
|
|
*/
|
|
static int setup_with_upstream(const char ***argv)
|
|
{
|
|
struct branch *branch = branch_get(NULL);
|
|
int i;
|
|
const char **args;
|
|
|
|
if (!branch)
|
|
die(_("No current branch."));
|
|
if (!branch->remote)
|
|
die(_("No remote for the current branch."));
|
|
if (!branch->merge_nr)
|
|
die(_("No default upstream defined for the current branch."));
|
|
|
|
args = xcalloc(branch->merge_nr + 1, sizeof(char *));
|
|
for (i = 0; i < branch->merge_nr; i++) {
|
|
if (!branch->merge[i]->dst)
|
|
die(_("No remote-tracking branch for %s from %s"),
|
|
branch->merge[i]->src, branch->remote_name);
|
|
args[i] = branch->merge[i]->dst;
|
|
}
|
|
args[i] = NULL;
|
|
*argv = args;
|
|
return i;
|
|
}
|
|
|
|
static void write_merge_state(struct commit_list *remoteheads)
|
|
{
|
|
const char *filename;
|
|
int fd;
|
|
struct commit_list *j;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
|
|
for (j = remoteheads; j; j = j->next) {
|
|
unsigned const char *sha1;
|
|
struct commit *c = j->item;
|
|
if (c->util && merge_remote_util(c)->obj) {
|
|
sha1 = merge_remote_util(c)->obj->sha1;
|
|
} else {
|
|
sha1 = c->object.sha1;
|
|
}
|
|
strbuf_addf(&buf, "%s\n", sha1_to_hex(sha1));
|
|
}
|
|
filename = git_path("MERGE_HEAD");
|
|
fd = open(filename, O_WRONLY | O_CREAT, 0666);
|
|
if (fd < 0)
|
|
die_errno(_("Could not open '%s' for writing"), filename);
|
|
if (write_in_full(fd, buf.buf, buf.len) != buf.len)
|
|
die_errno(_("Could not write to '%s'"), filename);
|
|
close(fd);
|
|
strbuf_addch(&merge_msg, '\n');
|
|
write_merge_msg(&merge_msg);
|
|
|
|
filename = git_path("MERGE_MODE");
|
|
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666);
|
|
if (fd < 0)
|
|
die_errno(_("Could not open '%s' for writing"), filename);
|
|
strbuf_reset(&buf);
|
|
if (fast_forward == FF_NO)
|
|
strbuf_addf(&buf, "no-ff");
|
|
if (write_in_full(fd, buf.buf, buf.len) != buf.len)
|
|
die_errno(_("Could not write to '%s'"), filename);
|
|
close(fd);
|
|
}
|
|
|
|
static int default_edit_option(void)
|
|
{
|
|
static const char name[] = "GIT_MERGE_AUTOEDIT";
|
|
const char *e = getenv(name);
|
|
struct stat st_stdin, st_stdout;
|
|
|
|
if (have_message)
|
|
/* an explicit -m msg without --[no-]edit */
|
|
return 0;
|
|
|
|
if (e) {
|
|
int v = git_config_maybe_bool(name, e);
|
|
if (v < 0)
|
|
die("Bad value '%s' in environment '%s'", e, name);
|
|
return v;
|
|
}
|
|
|
|
/* Use editor if stdin and stdout are the same and is a tty */
|
|
return (!fstat(0, &st_stdin) &&
|
|
!fstat(1, &st_stdout) &&
|
|
isatty(0) && isatty(1) &&
|
|
st_stdin.st_dev == st_stdout.st_dev &&
|
|
st_stdin.st_ino == st_stdout.st_ino &&
|
|
st_stdin.st_mode == st_stdout.st_mode);
|
|
}
|
|
|
|
static struct commit_list *collect_parents(struct commit *head_commit,
|
|
int *head_subsumed,
|
|
int argc, const char **argv)
|
|
{
|
|
int i;
|
|
struct commit_list *remoteheads = NULL, *parents, *next;
|
|
struct commit_list **remotes = &remoteheads;
|
|
|
|
if (head_commit)
|
|
remotes = &commit_list_insert(head_commit, remotes)->next;
|
|
for (i = 0; i < argc; i++) {
|
|
struct commit *commit = get_merge_parent(argv[i]);
|
|
if (!commit)
|
|
help_unknown_ref(argv[i], "merge",
|
|
"not something we can merge");
|
|
remotes = &commit_list_insert(commit, remotes)->next;
|
|
}
|
|
*remotes = NULL;
|
|
|
|
parents = reduce_heads(remoteheads);
|
|
|
|
*head_subsumed = 1; /* we will flip this to 0 when we find it */
|
|
for (remoteheads = NULL, remotes = &remoteheads;
|
|
parents;
|
|
parents = next) {
|
|
struct commit *commit = parents->item;
|
|
next = parents->next;
|
|
if (commit == head_commit)
|
|
*head_subsumed = 0;
|
|
else
|
|
remotes = &commit_list_insert(commit, remotes)->next;
|
|
}
|
|
return remoteheads;
|
|
}
|
|
|
|
int cmd_merge(int argc, const char **argv, const char *prefix)
|
|
{
|
|
unsigned char result_tree[20];
|
|
unsigned char stash[20];
|
|
unsigned char head_sha1[20];
|
|
struct commit *head_commit;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
const char *head_arg;
|
|
int flag, i, ret = 0, head_subsumed;
|
|
int best_cnt = -1, merge_was_ok = 0, automerge_was_ok = 0;
|
|
struct commit_list *common = NULL;
|
|
const char *best_strategy = NULL, *wt_strategy = NULL;
|
|
struct commit_list *remoteheads, *p;
|
|
void *branch_to_free;
|
|
|
|
if (argc == 2 && !strcmp(argv[1], "-h"))
|
|
usage_with_options(builtin_merge_usage, builtin_merge_options);
|
|
|
|
/*
|
|
* Check if we are _not_ on a detached HEAD, i.e. if there is a
|
|
* current branch.
|
|
*/
|
|
branch = branch_to_free = resolve_refdup("HEAD", head_sha1, 0, &flag);
|
|
if (branch && !prefixcmp(branch, "refs/heads/"))
|
|
branch += 11;
|
|
if (!branch || is_null_sha1(head_sha1))
|
|
head_commit = NULL;
|
|
else
|
|
head_commit = lookup_commit_or_die(head_sha1, "HEAD");
|
|
|
|
git_config(git_merge_config, NULL);
|
|
|
|
if (branch_mergeoptions)
|
|
parse_branch_merge_options(branch_mergeoptions);
|
|
argc = parse_options(argc, argv, prefix, builtin_merge_options,
|
|
builtin_merge_usage, 0);
|
|
if (shortlog_len < 0)
|
|
shortlog_len = (merge_log_config > 0) ? merge_log_config : 0;
|
|
|
|
if (verbosity < 0 && show_progress == -1)
|
|
show_progress = 0;
|
|
|
|
if (abort_current_merge) {
|
|
int nargc = 2;
|
|
const char *nargv[] = {"reset", "--merge", NULL};
|
|
|
|
if (!file_exists(git_path("MERGE_HEAD")))
|
|
die(_("There is no merge to abort (MERGE_HEAD missing)."));
|
|
|
|
/* Invoke 'git reset --merge' */
|
|
ret = cmd_reset(nargc, nargv, prefix);
|
|
goto done;
|
|
}
|
|
|
|
if (read_cache_unmerged())
|
|
die_resolve_conflict("merge");
|
|
|
|
if (file_exists(git_path("MERGE_HEAD"))) {
|
|
/*
|
|
* There is no unmerged entry, don't advise 'git
|
|
* add/rm <file>', just 'git commit'.
|
|
*/
|
|
if (advice_resolve_conflict)
|
|
die(_("You have not concluded your merge (MERGE_HEAD exists).\n"
|
|
"Please, commit your changes before you can merge."));
|
|
else
|
|
die(_("You have not concluded your merge (MERGE_HEAD exists)."));
|
|
}
|
|
if (file_exists(git_path("CHERRY_PICK_HEAD"))) {
|
|
if (advice_resolve_conflict)
|
|
die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists).\n"
|
|
"Please, commit your changes before you can merge."));
|
|
else
|
|
die(_("You have not concluded your cherry-pick (CHERRY_PICK_HEAD exists)."));
|
|
}
|
|
resolve_undo_clear();
|
|
|
|
if (verbosity < 0)
|
|
show_diffstat = 0;
|
|
|
|
if (squash) {
|
|
if (fast_forward == FF_NO)
|
|
die(_("You cannot combine --squash with --no-ff."));
|
|
option_commit = 0;
|
|
}
|
|
|
|
if (!abort_current_merge) {
|
|
if (!argc) {
|
|
if (default_to_upstream)
|
|
argc = setup_with_upstream(&argv);
|
|
else
|
|
die(_("No commit specified and merge.defaultToUpstream not set."));
|
|
} else if (argc == 1 && !strcmp(argv[0], "-"))
|
|
argv[0] = "@{-1}";
|
|
}
|
|
if (!argc)
|
|
usage_with_options(builtin_merge_usage,
|
|
builtin_merge_options);
|
|
|
|
/*
|
|
* 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 && head_commit &&
|
|
is_old_style_invocation(argc, argv, head_commit->object.sha1)) {
|
|
strbuf_addstr(&merge_msg, argv[0]);
|
|
head_arg = argv[1];
|
|
argv += 2;
|
|
argc -= 2;
|
|
remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
|
|
} else if (!head_commit) {
|
|
struct commit *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 (fast_forward == FF_NO)
|
|
die(_("Non-fast-forward commit does not make sense into "
|
|
"an empty head"));
|
|
remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
|
|
remote_head = remoteheads->item;
|
|
if (!remote_head)
|
|
die(_("%s - not something we can merge"), argv[0]);
|
|
read_empty(remote_head->object.sha1, 0);
|
|
update_ref("initial pull", "HEAD", remote_head->object.sha1,
|
|
NULL, 0, DIE_ON_ERR);
|
|
goto done;
|
|
} else {
|
|
struct strbuf merge_names = 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.
|
|
*/
|
|
remoteheads = collect_parents(head_commit, &head_subsumed, argc, argv);
|
|
for (p = remoteheads; p; p = p->next)
|
|
merge_name(merge_remote_util(p->item)->name, &merge_names);
|
|
|
|
if (!have_message || shortlog_len) {
|
|
struct fmt_merge_msg_opts opts;
|
|
memset(&opts, 0, sizeof(opts));
|
|
opts.add_title = !have_message;
|
|
opts.shortlog_len = shortlog_len;
|
|
opts.credit_people = (0 < option_edit);
|
|
|
|
fmt_merge_msg(&merge_names, &merge_msg, &opts);
|
|
if (merge_msg.len)
|
|
strbuf_setlen(&merge_msg, merge_msg.len - 1);
|
|
}
|
|
}
|
|
|
|
if (!head_commit || !argc)
|
|
usage_with_options(builtin_merge_usage,
|
|
builtin_merge_options);
|
|
|
|
if (verify_signatures) {
|
|
for (p = remoteheads; p; p = p->next) {
|
|
struct commit *commit = p->item;
|
|
char hex[41];
|
|
struct signature_check signature_check;
|
|
memset(&signature_check, 0, sizeof(signature_check));
|
|
|
|
check_commit_signature(commit, &signature_check);
|
|
|
|
strcpy(hex, find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV));
|
|
switch (signature_check.result) {
|
|
case 'G':
|
|
break;
|
|
case 'U':
|
|
die(_("Commit %s has an untrusted GPG signature, "
|
|
"allegedly by %s."), hex, signature_check.signer);
|
|
case 'B':
|
|
die(_("Commit %s has a bad GPG signature "
|
|
"allegedly by %s."), hex, signature_check.signer);
|
|
default: /* 'N' */
|
|
die(_("Commit %s does not have a GPG signature."), hex);
|
|
}
|
|
if (verbosity >= 0 && signature_check.result == 'G')
|
|
printf(_("Commit %s has a good GPG signature by %s\n"),
|
|
hex, signature_check.signer);
|
|
|
|
free(signature_check.gpg_output);
|
|
free(signature_check.gpg_status);
|
|
free(signature_check.signer);
|
|
free(signature_check.key);
|
|
}
|
|
}
|
|
|
|
strbuf_addstr(&buf, "merge");
|
|
for (p = remoteheads; p; p = p->next)
|
|
strbuf_addf(&buf, " %s", merge_remote_util(p->item)->name);
|
|
setenv("GIT_REFLOG_ACTION", buf.buf, 0);
|
|
strbuf_reset(&buf);
|
|
|
|
for (p = remoteheads; p; p = p->next) {
|
|
struct commit *commit = p->item;
|
|
strbuf_addf(&buf, "GITHEAD_%s",
|
|
sha1_to_hex(commit->object.sha1));
|
|
setenv(buf.buf, merge_remote_util(commit)->name, 1);
|
|
strbuf_reset(&buf);
|
|
if (fast_forward != FF_ONLY &&
|
|
merge_remote_util(commit) &&
|
|
merge_remote_util(commit)->obj &&
|
|
merge_remote_util(commit)->obj->type == OBJ_TAG)
|
|
fast_forward = FF_NO;
|
|
}
|
|
|
|
if (option_edit < 0)
|
|
option_edit = default_edit_option();
|
|
|
|
if (!use_strategies) {
|
|
if (!remoteheads)
|
|
; /* already up-to-date */
|
|
else if (!remoteheads->next)
|
|
add_strategies(pull_twohead, DEFAULT_TWOHEAD);
|
|
else
|
|
add_strategies(pull_octopus, DEFAULT_OCTOPUS);
|
|
}
|
|
|
|
for (i = 0; i < use_strategies_nr; i++) {
|
|
if (use_strategies[i]->attr & NO_FAST_FORWARD)
|
|
fast_forward = FF_NO;
|
|
if (use_strategies[i]->attr & NO_TRIVIAL)
|
|
allow_trivial = 0;
|
|
}
|
|
|
|
if (!remoteheads)
|
|
; /* already up-to-date */
|
|
else if (!remoteheads->next)
|
|
common = get_merge_bases(head_commit, remoteheads->item, 1);
|
|
else {
|
|
struct commit_list *list = remoteheads;
|
|
commit_list_insert(head_commit, &list);
|
|
common = get_octopus_merge_bases(list);
|
|
free(list);
|
|
}
|
|
|
|
update_ref("updating ORIG_HEAD", "ORIG_HEAD", head_commit->object.sha1,
|
|
NULL, 0, DIE_ON_ERR);
|
|
|
|
if (remoteheads && !common)
|
|
; /* No common ancestors found. We need a real merge. */
|
|
else if (!remoteheads ||
|
|
(!remoteheads->next && !common->next &&
|
|
common->item == remoteheads->item)) {
|
|
/*
|
|
* If head can reach all the merge then we are up to date.
|
|
* but first the most common case of merging one remote.
|
|
*/
|
|
finish_up_to_date("Already up-to-date.");
|
|
goto done;
|
|
} else if (fast_forward != FF_NO && !remoteheads->next &&
|
|
!common->next &&
|
|
!hashcmp(common->item->object.sha1, head_commit->object.sha1)) {
|
|
/* Again the most common case of merging one remote. */
|
|
struct strbuf msg = STRBUF_INIT;
|
|
struct commit *commit;
|
|
char hex[41];
|
|
|
|
strcpy(hex, find_unique_abbrev(head_commit->object.sha1, 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)");
|
|
commit = remoteheads->item;
|
|
if (!commit) {
|
|
ret = 1;
|
|
goto done;
|
|
}
|
|
|
|
if (checkout_fast_forward(head_commit->object.sha1,
|
|
commit->object.sha1,
|
|
overwrite_ignore)) {
|
|
ret = 1;
|
|
goto done;
|
|
}
|
|
|
|
finish(head_commit, remoteheads, commit->object.sha1, msg.buf);
|
|
drop_save();
|
|
goto done;
|
|
} else if (!remoteheads->next && common->next)
|
|
;
|
|
/*
|
|
* We are not doing octopus and not fast-forward. Need
|
|
* a real merge.
|
|
*/
|
|
else if (!remoteheads->next && !common->next && option_commit) {
|
|
/*
|
|
* We are not doing octopus, not fast-forward, and have
|
|
* only one common.
|
|
*/
|
|
refresh_cache(REFRESH_QUIET);
|
|
if (allow_trivial && fast_forward != FF_ONLY) {
|
|
/* See if it is really trivial. */
|
|
git_committer_info(IDENT_STRICT);
|
|
printf(_("Trying really trivial in-index merge...\n"));
|
|
if (!read_tree_trivial(common->item->object.sha1,
|
|
head_commit->object.sha1,
|
|
remoteheads->item->object.sha1)) {
|
|
ret = merge_trivial(head_commit, remoteheads);
|
|
goto done;
|
|
}
|
|
printf(_("Nope.\n"));
|
|
}
|
|
} else {
|
|
/*
|
|
* An octopus. If we can reach all the remote we are up
|
|
* to date.
|
|
*/
|
|
int up_to_date = 1;
|
|
struct commit_list *j;
|
|
|
|
for (j = remoteheads; j; j = j->next) {
|
|
struct commit_list *common_one;
|
|
|
|
/*
|
|
* Here we *have* to calculate the individual
|
|
* merge_bases again, otherwise "git merge HEAD^
|
|
* HEAD^^" would be missed.
|
|
*/
|
|
common_one = get_merge_bases(head_commit, j->item, 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!");
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (fast_forward == FF_ONLY)
|
|
die(_("Not possible to fast-forward, aborting."));
|
|
|
|
/* We are going to make a new commit. */
|
|
git_committer_info(IDENT_STRICT);
|
|
|
|
/*
|
|
* At this point, we need a real merge. No matter what strategy
|
|
* we use, it would operate on the index, possibly affecting the
|
|
* working tree, and when resolved cleanly, have the desired
|
|
* tree in the index -- this means that the index must be in
|
|
* sync with the head commit. The strategies are responsible
|
|
* to ensure this.
|
|
*/
|
|
if (use_strategies_nr == 1 ||
|
|
/*
|
|
* Stash away the local changes so that we can try more than one.
|
|
*/
|
|
save_state(stash))
|
|
hashcpy(stash, null_sha1);
|
|
|
|
for (i = 0; i < use_strategies_nr; i++) {
|
|
int ret;
|
|
if (i) {
|
|
printf(_("Rewinding the tree to pristine...\n"));
|
|
restore_state(head_commit->object.sha1, stash);
|
|
}
|
|
if (use_strategies_nr != 1)
|
|
printf(_("Trying merge strategy %s...\n"),
|
|
use_strategies[i]->name);
|
|
/*
|
|
* Remember which strategy left the state in the working
|
|
* tree.
|
|
*/
|
|
wt_strategy = use_strategies[i]->name;
|
|
|
|
ret = try_merge_strategy(use_strategies[i]->name,
|
|
common, remoteheads,
|
|
head_commit, 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) {
|
|
ret = finish_automerge(head_commit, head_subsumed,
|
|
common, remoteheads,
|
|
result_tree, wt_strategy);
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Pick the result from the best strategy and have the user fix
|
|
* it up.
|
|
*/
|
|
if (!best_strategy) {
|
|
restore_state(head_commit->object.sha1, stash);
|
|
if (use_strategies_nr > 1)
|
|
fprintf(stderr,
|
|
_("No merge strategy handled the merge.\n"));
|
|
else
|
|
fprintf(stderr, _("Merge with strategy %s failed.\n"),
|
|
use_strategies[0]->name);
|
|
ret = 2;
|
|
goto done;
|
|
} else if (best_strategy == wt_strategy)
|
|
; /* We already have its result in the working tree. */
|
|
else {
|
|
printf(_("Rewinding the tree to pristine...\n"));
|
|
restore_state(head_commit->object.sha1, stash);
|
|
printf(_("Using the %s to prepare resolving by hand.\n"),
|
|
best_strategy);
|
|
try_merge_strategy(best_strategy, common, remoteheads,
|
|
head_commit, head_arg);
|
|
}
|
|
|
|
if (squash)
|
|
finish(head_commit, remoteheads, NULL, NULL);
|
|
else
|
|
write_merge_state(remoteheads);
|
|
|
|
if (merge_was_ok)
|
|
fprintf(stderr, _("Automatic merge went well; "
|
|
"stopped before committing as requested\n"));
|
|
else
|
|
ret = suggest_conflicts(option_renormalize);
|
|
|
|
done:
|
|
free(branch_to_free);
|
|
return ret;
|
|
}
|