git/builtin/pull.c

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/*
* Builtin "git pull"
*
* Based on git-pull.sh by Junio C Hamano
*
* Fetch one or more remote refs and merge it/them into the current HEAD.
*/
#include "cache.h"
#include "builtin.h"
#include "parse-options.h"
#include "exec_cmd.h"
#include "run-command.h"
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#include "sha1-array.h"
#include "remote.h"
#include "dir.h"
#include "refs.h"
#include "revision.h"
#include "tempfile.h"
#include "lockfile.h"
#include "wt-status.h"
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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enum rebase_type {
REBASE_INVALID = -1,
REBASE_FALSE = 0,
REBASE_TRUE,
REBASE_PRESERVE,
REBASE_INTERACTIVE
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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};
/**
* Parses the value of --rebase. If value is a false value, returns
* REBASE_FALSE. If value is a true value, returns REBASE_TRUE. If value is
* "preserve", returns REBASE_PRESERVE. If value is a invalid value, dies with
* a fatal error if fatal is true, otherwise returns REBASE_INVALID.
*/
static enum rebase_type parse_config_rebase(const char *key, const char *value,
int fatal)
{
int v = git_config_maybe_bool("pull.rebase", value);
if (!v)
return REBASE_FALSE;
else if (v > 0)
return REBASE_TRUE;
else if (!strcmp(value, "preserve"))
return REBASE_PRESERVE;
else if (!strcmp(value, "interactive"))
return REBASE_INTERACTIVE;
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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if (fatal)
die(_("Invalid value for %s: %s"), key, value);
else
error(_("Invalid value for %s: %s"), key, value);
return REBASE_INVALID;
}
/**
* Callback for --rebase, which parses arg with parse_config_rebase().
*/
static int parse_opt_rebase(const struct option *opt, const char *arg, int unset)
{
enum rebase_type *value = opt->value;
if (arg)
*value = parse_config_rebase("--rebase", arg, 0);
else
*value = unset ? REBASE_FALSE : REBASE_TRUE;
return *value == REBASE_INVALID ? -1 : 0;
}
static const char * const pull_usage[] = {
N_("git pull [<options>] [<repository> [<refspec>...]]"),
NULL
};
/* Shared options */
static int opt_verbosity;
static char *opt_progress;
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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/* Options passed to git-merge or git-rebase */
static enum rebase_type opt_rebase = -1;
static char *opt_diffstat;
static char *opt_log;
static char *opt_squash;
static char *opt_commit;
static char *opt_edit;
static char *opt_ff;
static char *opt_verify_signatures;
static int opt_autostash = -1;
static int config_autostash;
static struct argv_array opt_strategies = ARGV_ARRAY_INIT;
static struct argv_array opt_strategy_opts = ARGV_ARRAY_INIT;
static char *opt_gpg_sign;
static int opt_allow_unrelated_histories;
/* Options passed to git-fetch */
static char *opt_all;
static char *opt_append;
static char *opt_upload_pack;
static int opt_force;
static char *opt_tags;
static char *opt_prune;
static char *opt_recurse_submodules;
static char *max_children;
static int opt_dry_run;
static char *opt_keep;
static char *opt_depth;
static char *opt_unshallow;
static char *opt_update_shallow;
static char *opt_refmap;
static struct option pull_options[] = {
/* Shared options */
OPT__VERBOSITY(&opt_verbosity),
OPT_PASSTHRU(0, "progress", &opt_progress, NULL,
N_("force progress reporting"),
PARSE_OPT_NOARG),
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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/* Options passed to git-merge or git-rebase */
OPT_GROUP(N_("Options related to merging")),
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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{ OPTION_CALLBACK, 'r', "rebase", &opt_rebase,
"false|true|preserve|interactive",
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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N_("incorporate changes by rebasing rather than merging"),
PARSE_OPT_OPTARG, parse_opt_rebase },
OPT_PASSTHRU('n', NULL, &opt_diffstat, NULL,
N_("do not show a diffstat at the end of the merge"),
PARSE_OPT_NOARG | PARSE_OPT_NONEG),
OPT_PASSTHRU(0, "stat", &opt_diffstat, NULL,
N_("show a diffstat at the end of the merge"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "summary", &opt_diffstat, NULL,
N_("(synonym to --stat)"),
PARSE_OPT_NOARG | PARSE_OPT_HIDDEN),
OPT_PASSTHRU(0, "log", &opt_log, N_("n"),
N_("add (at most <n>) entries from shortlog to merge commit message"),
PARSE_OPT_OPTARG),
OPT_PASSTHRU(0, "squash", &opt_squash, NULL,
N_("create a single commit instead of doing a merge"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "commit", &opt_commit, NULL,
N_("perform a commit if the merge succeeds (default)"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "edit", &opt_edit, NULL,
N_("edit message before committing"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "ff", &opt_ff, NULL,
N_("allow fast-forward"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "ff-only", &opt_ff, NULL,
N_("abort if fast-forward is not possible"),
PARSE_OPT_NOARG | PARSE_OPT_NONEG),
OPT_PASSTHRU(0, "verify-signatures", &opt_verify_signatures, NULL,
N_("verify that the named commit has a valid GPG signature"),
PARSE_OPT_NOARG),
OPT_BOOL(0, "autostash", &opt_autostash,
N_("automatically stash/stash pop before and after rebase")),
OPT_PASSTHRU_ARGV('s', "strategy", &opt_strategies, N_("strategy"),
N_("merge strategy to use"),
0),
OPT_PASSTHRU_ARGV('X', "strategy-option", &opt_strategy_opts,
N_("option=value"),
N_("option for selected merge strategy"),
0),
OPT_PASSTHRU('S', "gpg-sign", &opt_gpg_sign, N_("key-id"),
N_("GPG sign commit"),
PARSE_OPT_OPTARG),
OPT_SET_INT(0, "allow-unrelated-histories",
&opt_allow_unrelated_histories,
N_("allow merging unrelated histories"), 1),
/* Options passed to git-fetch */
OPT_GROUP(N_("Options related to fetching")),
OPT_PASSTHRU(0, "all", &opt_all, NULL,
N_("fetch from all remotes"),
PARSE_OPT_NOARG),
OPT_PASSTHRU('a', "append", &opt_append, NULL,
N_("append to .git/FETCH_HEAD instead of overwriting"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "upload-pack", &opt_upload_pack, N_("path"),
N_("path to upload pack on remote end"),
0),
OPT__FORCE(&opt_force, N_("force overwrite of local branch")),
OPT_PASSTHRU('t', "tags", &opt_tags, NULL,
N_("fetch all tags and associated objects"),
PARSE_OPT_NOARG),
OPT_PASSTHRU('p', "prune", &opt_prune, NULL,
N_("prune remote-tracking branches no longer on remote"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "recurse-submodules", &opt_recurse_submodules,
N_("on-demand"),
N_("control recursive fetching of submodules"),
PARSE_OPT_OPTARG),
OPT_PASSTHRU('j', "jobs", &max_children, N_("n"),
N_("number of submodules pulled in parallel"),
PARSE_OPT_OPTARG),
OPT_BOOL(0, "dry-run", &opt_dry_run,
N_("dry run")),
OPT_PASSTHRU('k', "keep", &opt_keep, NULL,
N_("keep downloaded pack"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "depth", &opt_depth, N_("depth"),
N_("deepen history of shallow clone"),
0),
OPT_PASSTHRU(0, "unshallow", &opt_unshallow, NULL,
N_("convert to a complete repository"),
PARSE_OPT_NONEG | PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "update-shallow", &opt_update_shallow, NULL,
N_("accept refs that update .git/shallow"),
PARSE_OPT_NOARG),
OPT_PASSTHRU(0, "refmap", &opt_refmap, N_("refmap"),
N_("specify fetch refmap"),
PARSE_OPT_NONEG),
OPT_END()
};
/**
* Pushes "-q" or "-v" switches into arr to match the opt_verbosity level.
*/
static void argv_push_verbosity(struct argv_array *arr)
{
int verbosity;
for (verbosity = opt_verbosity; verbosity > 0; verbosity--)
argv_array_push(arr, "-v");
for (verbosity = opt_verbosity; verbosity < 0; verbosity++)
argv_array_push(arr, "-q");
}
/**
* Pushes "-f" switches into arr to match the opt_force level.
*/
static void argv_push_force(struct argv_array *arr)
{
int force = opt_force;
while (force-- > 0)
argv_array_push(arr, "-f");
}
/**
* Sets the GIT_REFLOG_ACTION environment variable to the concatenation of argv
*/
static void set_reflog_message(int argc, const char **argv)
{
int i;
struct strbuf msg = STRBUF_INIT;
for (i = 0; i < argc; i++) {
if (i)
strbuf_addch(&msg, ' ');
strbuf_addstr(&msg, argv[i]);
}
setenv("GIT_REFLOG_ACTION", msg.buf, 0);
strbuf_release(&msg);
}
/**
* If pull.ff is unset, returns NULL. If pull.ff is "true", returns "--ff". If
* pull.ff is "false", returns "--no-ff". If pull.ff is "only", returns
* "--ff-only". Otherwise, if pull.ff is set to an invalid value, die with an
* error.
*/
static const char *config_get_ff(void)
{
const char *value;
if (git_config_get_value("pull.ff", &value))
return NULL;
switch (git_config_maybe_bool("pull.ff", value)) {
case 0:
return "--no-ff";
case 1:
return "--ff";
}
if (!strcmp(value, "only"))
return "--ff-only";
die(_("Invalid value for pull.ff: %s"), value);
}
/**
* Returns the default configured value for --rebase. It first looks for the
* value of "branch.$curr_branch.rebase", where $curr_branch is the current
* branch, and if HEAD is detached or the configuration key does not exist,
* looks for the value of "pull.rebase". If both configuration keys do not
* exist, returns REBASE_FALSE.
*/
static enum rebase_type config_get_rebase(void)
{
struct branch *curr_branch = branch_get("HEAD");
const char *value;
if (curr_branch) {
char *key = xstrfmt("branch.%s.rebase", curr_branch->name);
if (!git_config_get_value(key, &value)) {
enum rebase_type ret = parse_config_rebase(key, value, 1);
free(key);
return ret;
}
free(key);
}
if (!git_config_get_value("pull.rebase", &value))
return parse_config_rebase("pull.rebase", value, 1);
return REBASE_FALSE;
}
/**
* Read config variables.
*/
static int git_pull_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "rebase.autostash")) {
config_autostash = git_config_bool(var, value);
return 0;
}
return git_default_config(var, value, cb);
}
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/**
* Appends merge candidates from FETCH_HEAD that are not marked not-for-merge
* into merge_heads.
*/
static void get_merge_heads(struct sha1_array *merge_heads)
{
const char *filename = git_path("FETCH_HEAD");
FILE *fp;
struct strbuf sb = STRBUF_INIT;
unsigned char sha1[GIT_SHA1_RAWSZ];
if (!(fp = fopen(filename, "r")))
die_errno(_("could not open '%s' for reading"), filename);
while (strbuf_getline_lf(&sb, fp) != EOF) {
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if (get_sha1_hex(sb.buf, sha1))
continue; /* invalid line: does not start with SHA1 */
if (starts_with(sb.buf + GIT_SHA1_HEXSZ, "\tnot-for-merge\t"))
continue; /* ref is not-for-merge */
sha1_array_append(merge_heads, sha1);
}
fclose(fp);
strbuf_release(&sb);
}
/**
* Used by die_no_merge_candidates() as a for_each_remote() callback to
* retrieve the name of the remote if the repository only has one remote.
*/
static int get_only_remote(struct remote *remote, void *cb_data)
{
const char **remote_name = cb_data;
if (*remote_name)
return -1;
*remote_name = remote->name;
return 0;
}
/**
* Dies with the appropriate reason for why there are no merge candidates:
*
* 1. We fetched from a specific remote, and a refspec was given, but it ended
* up not fetching anything. This is usually because the user provided a
* wildcard refspec which had no matches on the remote end.
*
* 2. We fetched from a non-default remote, but didn't specify a branch to
* merge. We can't use the configured one because it applies to the default
* remote, thus the user must specify the branches to merge.
*
* 3. We fetched from the branch's or repo's default remote, but:
*
* a. We are not on a branch, so there will never be a configured branch to
* merge with.
*
* b. We are on a branch, but there is no configured branch to merge with.
*
* 4. We fetched from the branch's or repo's default remote, but the configured
* branch to merge didn't get fetched. (Either it doesn't exist, or wasn't
* part of the configured fetch refspec.)
*/
static void NORETURN die_no_merge_candidates(const char *repo, const char **refspecs)
{
struct branch *curr_branch = branch_get("HEAD");
const char *remote = curr_branch ? curr_branch->remote_name : NULL;
if (*refspecs) {
if (opt_rebase)
fprintf_ln(stderr, _("There is no candidate for rebasing against among the refs that you just fetched."));
else
fprintf_ln(stderr, _("There are no candidates for merging among the refs that you just fetched."));
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fprintf_ln(stderr, _("Generally this means that you provided a wildcard refspec which had no\n"
"matches on the remote end."));
} else if (repo && curr_branch && (!remote || strcmp(repo, remote))) {
fprintf_ln(stderr, _("You asked to pull from the remote '%s', but did not specify\n"
"a branch. Because this is not the default configured remote\n"
"for your current branch, you must specify a branch on the command line."),
repo);
} else if (!curr_branch) {
fprintf_ln(stderr, _("You are not currently on a branch."));
if (opt_rebase)
fprintf_ln(stderr, _("Please specify which branch you want to rebase against."));
else
fprintf_ln(stderr, _("Please specify which branch you want to merge with."));
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fprintf_ln(stderr, _("See git-pull(1) for details."));
fprintf(stderr, "\n");
fprintf_ln(stderr, " git pull %s %s", _("<remote>"), _("<branch>"));
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fprintf(stderr, "\n");
} else if (!curr_branch->merge_nr) {
const char *remote_name = NULL;
if (for_each_remote(get_only_remote, &remote_name) || !remote_name)
remote_name = _("<remote>");
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fprintf_ln(stderr, _("There is no tracking information for the current branch."));
if (opt_rebase)
fprintf_ln(stderr, _("Please specify which branch you want to rebase against."));
else
fprintf_ln(stderr, _("Please specify which branch you want to merge with."));
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fprintf_ln(stderr, _("See git-pull(1) for details."));
fprintf(stderr, "\n");
fprintf_ln(stderr, " git pull %s %s", _("<remote>"), _("<branch>"));
2015-06-18 10:54:02 +00:00
fprintf(stderr, "\n");
fprintf_ln(stderr, _("If you wish to set tracking information for this branch you can do so with:"));
fprintf(stderr, "\n");
fprintf_ln(stderr, " git branch --set-upstream-to=%s/%s %s\n",
remote_name, _("<branch>"), curr_branch->name);
2015-06-18 10:54:02 +00:00
} else
fprintf_ln(stderr, _("Your configuration specifies to merge with the ref '%s'\n"
"from the remote, but no such ref was fetched."),
*curr_branch->merge_name);
exit(1);
}
/**
* Parses argv into [<repo> [<refspecs>...]], returning their values in `repo`
* as a string and `refspecs` as a null-terminated array of strings. If `repo`
* is not provided in argv, it is set to NULL.
*/
static void parse_repo_refspecs(int argc, const char **argv, const char **repo,
const char ***refspecs)
{
if (argc > 0) {
*repo = *argv++;
argc--;
} else
*repo = NULL;
*refspecs = argv;
}
/**
* Runs git-fetch, returning its exit status. `repo` and `refspecs` are the
* repository and refspecs to fetch, or NULL if they are not provided.
*/
static int run_fetch(const char *repo, const char **refspecs)
{
struct argv_array args = ARGV_ARRAY_INIT;
int ret;
argv_array_pushl(&args, "fetch", "--update-head-ok", NULL);
/* Shared options */
argv_push_verbosity(&args);
if (opt_progress)
argv_array_push(&args, opt_progress);
/* Options passed to git-fetch */
if (opt_all)
argv_array_push(&args, opt_all);
if (opt_append)
argv_array_push(&args, opt_append);
if (opt_upload_pack)
argv_array_push(&args, opt_upload_pack);
argv_push_force(&args);
if (opt_tags)
argv_array_push(&args, opt_tags);
if (opt_prune)
argv_array_push(&args, opt_prune);
if (opt_recurse_submodules)
argv_array_push(&args, opt_recurse_submodules);
if (max_children)
argv_array_push(&args, max_children);
if (opt_dry_run)
argv_array_push(&args, "--dry-run");
if (opt_keep)
argv_array_push(&args, opt_keep);
if (opt_depth)
argv_array_push(&args, opt_depth);
if (opt_unshallow)
argv_array_push(&args, opt_unshallow);
if (opt_update_shallow)
argv_array_push(&args, opt_update_shallow);
if (opt_refmap)
argv_array_push(&args, opt_refmap);
if (repo) {
argv_array_push(&args, repo);
argv_array_pushv(&args, refspecs);
} else if (*refspecs)
die("BUG: refspecs without repo?");
ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
argv_array_clear(&args);
return ret;
}
/**
* "Pulls into void" by branching off merge_head.
*/
static int pull_into_void(const unsigned char *merge_head,
const unsigned char *curr_head)
{
/*
* Two-way merge: we treat the index as based on an empty tree,
* and try to fast-forward to HEAD. This ensures we will not lose
* index/worktree changes that the user already made on the unborn
* branch.
*/
if (checkout_fast_forward(EMPTY_TREE_SHA1_BIN, merge_head, 0))
return 1;
if (update_ref("initial pull", "HEAD", merge_head, curr_head, 0, UPDATE_REFS_DIE_ON_ERR))
return 1;
return 0;
}
/**
* Runs git-merge, returning its exit status.
*/
static int run_merge(void)
{
int ret;
struct argv_array args = ARGV_ARRAY_INIT;
argv_array_pushl(&args, "merge", NULL);
/* Shared options */
argv_push_verbosity(&args);
if (opt_progress)
argv_array_push(&args, opt_progress);
/* Options passed to git-merge */
if (opt_diffstat)
argv_array_push(&args, opt_diffstat);
if (opt_log)
argv_array_push(&args, opt_log);
if (opt_squash)
argv_array_push(&args, opt_squash);
if (opt_commit)
argv_array_push(&args, opt_commit);
if (opt_edit)
argv_array_push(&args, opt_edit);
if (opt_ff)
argv_array_push(&args, opt_ff);
if (opt_verify_signatures)
argv_array_push(&args, opt_verify_signatures);
argv_array_pushv(&args, opt_strategies.argv);
argv_array_pushv(&args, opt_strategy_opts.argv);
if (opt_gpg_sign)
argv_array_push(&args, opt_gpg_sign);
if (opt_allow_unrelated_histories > 0)
argv_array_push(&args, "--allow-unrelated-histories");
argv_array_push(&args, "FETCH_HEAD");
ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
argv_array_clear(&args);
return ret;
}
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-18 10:54:08 +00:00
/**
* Returns remote's upstream branch for the current branch. If remote is NULL,
* the current branch's configured default remote is used. Returns NULL if
* `remote` does not name a valid remote, HEAD does not point to a branch,
* remote is not the branch's configured remote or the branch does not have any
* configured upstream branch.
*/
static const char *get_upstream_branch(const char *remote)
{
struct remote *rm;
struct branch *curr_branch;
const char *curr_branch_remote;
rm = remote_get(remote);
if (!rm)
return NULL;
curr_branch = branch_get("HEAD");
if (!curr_branch)
return NULL;
curr_branch_remote = remote_for_branch(curr_branch, NULL);
assert(curr_branch_remote);
if (strcmp(curr_branch_remote, rm->name))
return NULL;
return branch_get_upstream(curr_branch, NULL);
}
/**
* Derives the remote tracking branch from the remote and refspec.
*
* FIXME: The current implementation assumes the default mapping of
* refs/heads/<branch_name> to refs/remotes/<remote_name>/<branch_name>.
*/
static const char *get_tracking_branch(const char *remote, const char *refspec)
{
struct refspec *spec;
const char *spec_src;
const char *merge_branch;
spec = parse_fetch_refspec(1, &refspec);
spec_src = spec->src;
if (!*spec_src || !strcmp(spec_src, "HEAD"))
spec_src = "HEAD";
else if (skip_prefix(spec_src, "heads/", &spec_src))
;
else if (skip_prefix(spec_src, "refs/heads/", &spec_src))
;
else if (starts_with(spec_src, "refs/") ||
starts_with(spec_src, "tags/") ||
starts_with(spec_src, "remotes/"))
spec_src = "";
if (*spec_src) {
if (!strcmp(remote, "."))
merge_branch = mkpath("refs/heads/%s", spec_src);
else
merge_branch = mkpath("refs/remotes/%s/%s", remote, spec_src);
} else
merge_branch = NULL;
free_refspec(1, spec);
return merge_branch;
}
/**
* Given the repo and refspecs, sets fork_point to the point at which the
* current branch forked from its remote tracking branch. Returns 0 on success,
* -1 on failure.
*/
static int get_rebase_fork_point(unsigned char *fork_point, const char *repo,
const char *refspec)
{
int ret;
struct branch *curr_branch;
const char *remote_branch;
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf sb = STRBUF_INIT;
curr_branch = branch_get("HEAD");
if (!curr_branch)
return -1;
if (refspec)
remote_branch = get_tracking_branch(repo, refspec);
else
remote_branch = get_upstream_branch(repo);
if (!remote_branch)
return -1;
argv_array_pushl(&cp.args, "merge-base", "--fork-point",
remote_branch, curr_branch->name, NULL);
cp.no_stdin = 1;
cp.no_stderr = 1;
cp.git_cmd = 1;
ret = capture_command(&cp, &sb, GIT_SHA1_HEXSZ);
if (ret)
goto cleanup;
ret = get_sha1_hex(sb.buf, fork_point);
if (ret)
goto cleanup;
cleanup:
strbuf_release(&sb);
return ret ? -1 : 0;
}
/**
* Sets merge_base to the octopus merge base of curr_head, merge_head and
* fork_point. Returns 0 if a merge base is found, 1 otherwise.
*/
static int get_octopus_merge_base(unsigned char *merge_base,
const unsigned char *curr_head,
const unsigned char *merge_head,
const unsigned char *fork_point)
{
struct commit_list *revs = NULL, *result;
commit_list_insert(lookup_commit_reference(curr_head), &revs);
commit_list_insert(lookup_commit_reference(merge_head), &revs);
if (!is_null_sha1(fork_point))
commit_list_insert(lookup_commit_reference(fork_point), &revs);
result = reduce_heads(get_octopus_merge_bases(revs));
free_commit_list(revs);
if (!result)
return 1;
hashcpy(merge_base, result->item->object.oid.hash);
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-18 10:54:08 +00:00
return 0;
}
/**
* Given the current HEAD SHA1, the merge head returned from git-fetch and the
* fork point calculated by get_rebase_fork_point(), runs git-rebase with the
* appropriate arguments and returns its exit status.
*/
static int run_rebase(const unsigned char *curr_head,
const unsigned char *merge_head,
const unsigned char *fork_point)
{
int ret;
unsigned char oct_merge_base[GIT_SHA1_RAWSZ];
struct argv_array args = ARGV_ARRAY_INIT;
if (!get_octopus_merge_base(oct_merge_base, curr_head, merge_head, fork_point))
if (!is_null_sha1(fork_point) && !hashcmp(oct_merge_base, fork_point))
fork_point = NULL;
argv_array_push(&args, "rebase");
/* Shared options */
argv_push_verbosity(&args);
/* Options passed to git-rebase */
if (opt_rebase == REBASE_PRESERVE)
argv_array_push(&args, "--preserve-merges");
else if (opt_rebase == REBASE_INTERACTIVE)
argv_array_push(&args, "--interactive");
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-18 10:54:08 +00:00
if (opt_diffstat)
argv_array_push(&args, opt_diffstat);
argv_array_pushv(&args, opt_strategies.argv);
argv_array_pushv(&args, opt_strategy_opts.argv);
if (opt_gpg_sign)
argv_array_push(&args, opt_gpg_sign);
if (opt_autostash == 0)
argv_array_push(&args, "--no-autostash");
else if (opt_autostash == 1)
argv_array_push(&args, "--autostash");
if (opt_verify_signatures &&
!strcmp(opt_verify_signatures, "--verify-signatures"))
warning(_("ignoring --verify-signatures for rebase"));
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-18 10:54:08 +00:00
argv_array_push(&args, "--onto");
argv_array_push(&args, sha1_to_hex(merge_head));
if (fork_point && !is_null_sha1(fork_point))
argv_array_push(&args, sha1_to_hex(fork_point));
else
argv_array_push(&args, sha1_to_hex(merge_head));
ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
argv_array_clear(&args);
return ret;
}
int cmd_pull(int argc, const char **argv, const char *prefix)
{
const char *repo, **refspecs;
2015-06-18 10:54:02 +00:00
struct sha1_array merge_heads = SHA1_ARRAY_INIT;
unsigned char orig_head[GIT_SHA1_RAWSZ], curr_head[GIT_SHA1_RAWSZ];
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-18 10:54:08 +00:00
unsigned char rebase_fork_point[GIT_SHA1_RAWSZ];
if (!getenv("GIT_REFLOG_ACTION"))
set_reflog_message(argc, argv);
argc = parse_options(argc, argv, prefix, pull_options, pull_usage, 0);
parse_repo_refspecs(argc, argv, &repo, &refspecs);
if (!opt_ff)
opt_ff = xstrdup_or_null(config_get_ff());
if (opt_rebase < 0)
opt_rebase = config_get_rebase();
git_config(git_pull_config, NULL);
if (read_cache_unmerged())
die_resolve_conflict("pull");
if (file_exists(git_path("MERGE_HEAD")))
die_conclude_merge();
if (get_sha1("HEAD", orig_head))
hashclr(orig_head);
if (!opt_rebase && opt_autostash != -1)
die(_("--[no-]autostash option is only valid with --rebase."));
if (opt_rebase) {
int autostash = config_autostash;
if (opt_autostash != -1)
autostash = opt_autostash;
if (is_null_sha1(orig_head) && !is_cache_unborn())
die(_("Updating an unborn branch with changes added to the index."));
if (!autostash)
require_clean_work_tree(N_("pull with rebase"),
_("please commit or stash them."), 1, 0);
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-18 10:54:08 +00:00
if (get_rebase_fork_point(rebase_fork_point, repo, *refspecs))
hashclr(rebase_fork_point);
}
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-18 10:54:08 +00:00
if (run_fetch(repo, refspecs))
return 1;
if (opt_dry_run)
return 0;
if (get_sha1("HEAD", curr_head))
hashclr(curr_head);
if (!is_null_sha1(orig_head) && !is_null_sha1(curr_head) &&
hashcmp(orig_head, curr_head)) {
/*
* The fetch involved updating the current branch.
*
* The working tree and the index file are still based on
* orig_head commit, but we are merging into curr_head.
* Update the working tree to match curr_head.
*/
warning(_("fetch updated the current branch head.\n"
"fast-forwarding your working tree from\n"
"commit %s."), sha1_to_hex(orig_head));
if (checkout_fast_forward(orig_head, curr_head, 0))
die(_("Cannot fast-forward your working tree.\n"
"After making sure that you saved anything precious from\n"
"$ git diff %s\n"
"output, run\n"
"$ git reset --hard\n"
"to recover."), sha1_to_hex(orig_head));
}
2015-06-18 10:54:02 +00:00
get_merge_heads(&merge_heads);
if (!merge_heads.nr)
die_no_merge_candidates(repo, refspecs);
if (is_null_sha1(orig_head)) {
if (merge_heads.nr > 1)
die(_("Cannot merge multiple branches into empty head."));
return pull_into_void(*merge_heads.sha1, curr_head);
}
if (opt_rebase && merge_heads.nr > 1)
die(_("Cannot rebase onto multiple branches."));
if (opt_rebase) {
struct commit_list *list = NULL;
struct commit *merge_head, *head;
head = lookup_commit_reference(orig_head);
commit_list_insert(head, &list);
merge_head = lookup_commit_reference(merge_heads.sha1[0]);
if (is_descendant_of(merge_head, list)) {
/* we can fast-forward this without invoking rebase */
opt_ff = "--ff-only";
return run_merge();
}
pull: teach git pull about --rebase Since cd67e4d (Teach 'git pull' about --rebase, 2007-11-28), if the --rebase option is set, git-rebase is run instead of git-merge. Re-implement this by introducing run_rebase(), which is called instead of run_merge() if opt_rebase is a true value. Since c85c792 (pull --rebase: be cleverer with rebased upstream branches, 2008-01-26), git-pull handles the case where the upstream branch was rebased since it was last fetched. The fork point (old remote ref) of the branch from the upstream branch is calculated before fetch, and then rebased from onto the new remote head (merge_head) after fetch. Re-implement this by introducing get_merge_branch_2() and get_merge_branch_1() to find the upstream branch for the specified/current branch, and get_rebase_fork_point() which will find the fork point between the upstream branch and current branch. However, the above change created a problem where git-rebase cannot detect commits that are already upstream, and thus may result in unnecessary conflicts. cf65426 (pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches, 2010-08-12) fixes this by ignoring the above old remote ref if it is contained within the merge base of the merge head and the current branch. This is re-implemented in run_rebase() where fork_point is not used if it is the merge base returned by get_octopus_merge_base(). Helped-by: Stefan Beller <sbeller@google.com> Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-18 10:54:08 +00:00
return run_rebase(curr_head, *merge_heads.sha1, rebase_fork_point);
} else {
return run_merge();
}
}