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push: introduce REJECT_FETCH_FIRST and REJECT_NEEDS_FORCE

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When we push to update an existing ref, if:

 * the object at the tip of the remote is not a commit; or
 * the object we are pushing is not a commit,

it won't be correct to suggest to fetch, integrate and push again,
as the old and new objects will not "merge".  We should explain that
the push must be forced when there is a non-committish object is
involved in such a case.

If we do not have the current object at the tip of the remote, we do
not even know that object, when fetched, is something that can be
merged.  In such a case, suggesting to pull first just like
non-fast-forward case may not be technically correct, but in
practice, most such failures are seen when you try to push your work
to a branch without knowing that somebody else already pushed to
update the same branch since you forked, so "pull first" would work
as a suggestion most of the time.  And if the object at the tip is
not a commit, "pull first" will fail, without making any permanent
damage.  As a side effect, it also makes the error message the user
will get during the next "push" attempt easier to understand, now
the user is aware that a non-commit object is involved.

In these cases, the current code already rejects such a push on the
client end, but we used the same error and advice messages as the
ones used when rejecting a non-fast-forward push, i.e. pull from
there and integrate before pushing again.

Introduce new rejection reasons and reword the messages
appropriately.

[jc: with help by Peff on message details]

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2013-01-23 13:55:30 -08:00
parent 0f4d498dbe
commit 75e5c0dc55
11 changed files with 93 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/config.txt
View File

@ -143,7 +143,8 @@ advice.*::
pushUpdateRejected::
Set this variable to 'false' if you want to disable
'pushNonFFCurrent', 'pushNonFFDefault',
'pushNonFFMatching', and 'pushAlreadyExists'
'pushNonFFMatching', 'pushAlreadyExists',
'pushFetchFirst', and 'pushNeedsForce'
simultaneously.
pushNonFFCurrent::
Advice shown when linkgit:git-push[1] fails due to a
@ -162,6 +163,15 @@ advice.*::
pushAlreadyExists::
Shown when linkgit:git-push[1] rejects an update that
does not qualify for fast-forwarding (e.g., a tag.)
pushFetchFirst::
Shown when linkgit:git-push[1] rejects an update that
tries to overwrite a remote ref that points at an
object we do not have.
pushNeedsForce::
Shown when linkgit:git-push[1] rejects an update that
tries to overwrite a remote ref that points at an
object that is not a committish, or make the remote
ref point at an object that is not a committish.
statusHints::
Show directions on how to proceed from the current
state in the output of linkgit:git-status[1] and in

4
advice.c
View File

@ -5,6 +5,8 @@ int advice_push_non_ff_current = 1;
int advice_push_non_ff_default = 1;
int advice_push_non_ff_matching = 1;
int advice_push_already_exists = 1;
int advice_push_fetch_first = 1;
int advice_push_needs_force = 1;
int advice_status_hints = 1;
int advice_commit_before_merge = 1;
int advice_resolve_conflict = 1;
@ -20,6 +22,8 @@ static struct {
{ "pushnonffdefault", &advice_push_non_ff_default },
{ "pushnonffmatching", &advice_push_non_ff_matching },
{ "pushalreadyexists", &advice_push_already_exists },
{ "pushfetchfirst", &advice_push_fetch_first },
{ "pushneedsforce", &advice_push_needs_force },
{ "statushints", &advice_status_hints },
{ "commitbeforemerge", &advice_commit_before_merge },
{ "resolveconflict", &advice_resolve_conflict },

2
advice.h
View File

@ -8,6 +8,8 @@ extern int advice_push_non_ff_current;
extern int advice_push_non_ff_default;
extern int advice_push_non_ff_matching;
extern int advice_push_already_exists;
extern int advice_push_fetch_first;
extern int advice_push_needs_force;
extern int advice_status_hints;
extern int advice_commit_before_merge;
extern int advice_resolve_conflict;

30
builtin/push.c
View File

@ -220,10 +220,22 @@ static const char message_advice_checkout_pull_push[] =
"(e.g. 'git pull') before pushing again.\n"
"See the 'Note about fast-forwards' in 'git push --help' for details.");
static const char message_advice_ref_fetch_first[] =
N_("Updates were rejected because the remote contains work that you do\n"
"not have locally. This is usually caused by another repository pushing\n"
"to the same ref. You may want to first merge the remote changes (e.g.,\n"
"'git pull') before pushing again.\n"
"See the 'Note about fast-forwards' in 'git push --help' for details.");
static const char message_advice_ref_already_exists[] =
N_("Updates were rejected because the destination reference already exists\n"
"in the remote.");
static const char message_advice_ref_needs_force[] =
N_("You cannot update a remote ref that points at a non-commit object,\n"
"or update a remote ref to make it point at a non-commit object,\n"
"without using the '--force' option.\n");
static void advise_pull_before_push(void)
{
if (!advice_push_non_ff_current || !advice_push_update_rejected)
@ -252,6 +264,20 @@ static void advise_ref_already_exists(void)
advise(_(message_advice_ref_already_exists));
}
static void advise_ref_fetch_first(void)
{
if (!advice_push_fetch_first || !advice_push_update_rejected)
return;
advise(_(message_advice_ref_fetch_first));
}
static void advise_ref_needs_force(void)
{
if (!advice_push_needs_force || !advice_push_update_rejected)
return;
advise(_(message_advice_ref_needs_force));
}
static int push_with_options(struct transport *transport, int flags)
{
int err;
@ -285,6 +311,10 @@ static int push_with_options(struct transport *transport, int flags)
advise_checkout_pull_push();
} else if (reject_reasons & REJECT_ALREADY_EXISTS) {
advise_ref_already_exists();
} else if (reject_reasons & REJECT_FETCH_FIRST) {
advise_ref_fetch_first();
} else if (reject_reasons & REJECT_NEEDS_FORCE) {
advise_ref_needs_force();
}
return 1;

10
builtin/send-pack.c
View File

@ -44,6 +44,16 @@ static void print_helper_status(struct ref *ref)
msg = "non-fast forward";
break;
case REF_STATUS_REJECT_FETCH_FIRST:
res = "error";
msg = "fetch first";
break;
case REF_STATUS_REJECT_NEEDS_FORCE:
res = "error";
msg = "needs force";
break;
case REF_STATUS_REJECT_ALREADY_EXISTS:
res = "error";
msg = "already exists";

2
cache.h
View File

@ -1010,6 +1010,8 @@ struct ref {
REF_STATUS_REJECT_NONFASTFORWARD,
REF_STATUS_REJECT_ALREADY_EXISTS,
REF_STATUS_REJECT_NODELETE,
REF_STATUS_REJECT_FETCH_FIRST,
REF_STATUS_REJECT_NEEDS_FORCE,
REF_STATUS_UPTODATE,
REF_STATUS_REMOTE_REJECT,
REF_STATUS_EXPECTING_REPORT

11
remote.c
View File

@ -1322,8 +1322,12 @@ void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
if (!prefixcmp(ref->name, "refs/tags/"))
why = REF_STATUS_REJECT_ALREADY_EXISTS;
else if (!has_sha1_file(ref->old_sha1)
|| !ref_newer(ref->new_sha1, ref->old_sha1))
else if (!has_sha1_file(ref->old_sha1))
why = REF_STATUS_REJECT_FETCH_FIRST;
else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
!lookup_commit_reference_gently(ref->new_sha1, 1))
why = REF_STATUS_REJECT_NEEDS_FORCE;
else if (!ref_newer(ref->new_sha1, ref->old_sha1))
why = REF_STATUS_REJECT_NONFASTFORWARD;
if (!force_ref_update)
@ -1512,7 +1516,8 @@ int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
struct commit_list *list, *used;
int found = 0;
/* Both new and old must be commit-ish and new is descendant of
/*
* Both new and old must be commit-ish and new is descendant of
* old. Otherwise we require --force.
*/
o = deref_tag(parse_object(old_sha1), NULL, 0);

2
send-pack.c
View File

@ -230,6 +230,8 @@ int send_pack(struct send_pack_args *args,
switch (ref->status) {
case REF_STATUS_REJECT_NONFASTFORWARD:
case REF_STATUS_REJECT_ALREADY_EXISTS:
case REF_STATUS_REJECT_FETCH_FIRST:
case REF_STATUS_REJECT_NEEDS_FORCE:
case REF_STATUS_UPTODATE:
continue;
default:

10
transport-helper.c
View File

@ -666,6 +666,16 @@ static void push_update_ref_status(struct strbuf *buf,
free(msg);
msg = NULL;
}
else if (!strcmp(msg, "fetch first")) {
status = REF_STATUS_REJECT_FETCH_FIRST;
free(msg);
msg = NULL;
}
else if (!strcmp(msg, "needs force")) {
status = REF_STATUS_REJECT_NEEDS_FORCE;
free(msg);
msg = NULL;
}
}
if (*ref)

12
transport.c
View File

@ -699,6 +699,14 @@ static int print_one_push_status(struct ref *ref, const char *dest, int count, i
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"already exists", porcelain);
break;
case REF_STATUS_REJECT_FETCH_FIRST:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"fetch first", porcelain);
break;
case REF_STATUS_REJECT_NEEDS_FORCE:
print_ref_status('!', "[rejected]", ref, ref->peer_ref,
"needs force", porcelain);
break;
case REF_STATUS_REMOTE_REJECT:
print_ref_status('!', "[remote rejected]", ref,
ref->deletion ? NULL : ref->peer_ref,
@ -750,6 +758,10 @@ void transport_print_push_status(const char *dest, struct ref *refs,
*reject_reasons |= REJECT_NON_FF_OTHER;
} else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
*reject_reasons |= REJECT_ALREADY_EXISTS;
} else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
*reject_reasons |= REJECT_FETCH_FIRST;
} else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
*reject_reasons |= REJECT_NEEDS_FORCE;
}
}
}

2
transport.h
View File

@ -143,6 +143,8 @@ void transport_set_verbosity(struct transport *transport, int verbosity,
#define REJECT_NON_FF_HEAD 0x01
#define REJECT_NON_FF_OTHER 0x02
#define REJECT_ALREADY_EXISTS 0x04
#define REJECT_FETCH_FIRST 0x08
#define REJECT_NEEDS_FORCE 0x10
int transport_push(struct transport *connection,
int refspec_nr, const char **refspec, int flags,