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receive-pack.c: add execute_commands_atomic function

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This introduces the new function execute_commands_atomic which will use
one atomic transaction for all updates. The default behavior is still
the old non atomic way, one ref at a time. This is to cause as little
disruption as possible to existing clients. It is unknown if there are
client scripts that depend on the old non-atomic behavior so we make it
opt-in for now.

A later patch will add the possibility to actually use the functionality
added by this patch. For now use_atomic is always 0.

Inspired-by: Ronnie Sahlberg <sahlberg@google.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Stefan Beller 2015-01-07 19:23:19 -08:00 committed by Junio C Hamano
parent 222368c645
commit 68deed298a
1 changed files with 46 additions and 1 deletions
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47
builtin/receive-pack.c
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@ -40,6 +40,7 @@ static int transfer_unpack_limit = -1;
static int unpack_limit = 100;
static int report_status;
static int use_sideband;
static int use_atomic;
static int quiet;
static int prefer_ofs_delta = 1;
static int auto_update_server_info;
@ -1095,7 +1096,48 @@ static void execute_commands_non_atomic(struct command *commands,
}
ref_transaction_free(transaction);
}
strbuf_release(&err);
}
static void execute_commands_atomic(struct command *commands,
struct shallow_info *si)
{
struct command *cmd;
struct strbuf err = STRBUF_INIT;
const char *reported_error = "atomic push failure";
transaction = ref_transaction_begin(&err);
if (!transaction) {
rp_error("%s", err.buf);
strbuf_reset(&err);
reported_error = "transaction failed to start";
goto failure;
}
for (cmd = commands; cmd; cmd = cmd->next) {
if (!should_process_cmd(cmd))
continue;
cmd->error_string = update(cmd, si);
if (cmd->error_string)
goto failure;
}
if (ref_transaction_commit(transaction, &err)) {
rp_error("%s", err.buf);
reported_error = "atomic transaction failed";
goto failure;
}
goto cleanup;
failure:
for (cmd = commands; cmd; cmd = cmd->next)
if (!cmd->error_string)
cmd->error_string = reported_error;
cleanup:
ref_transaction_free(transaction);
strbuf_release(&err);
}
@ -1133,7 +1175,10 @@ static void execute_commands(struct command *commands,
free(head_name_to_free);
head_name = head_name_to_free = resolve_refdup("HEAD", 0, sha1, NULL);
execute_commands_non_atomic(commands, si);
if (use_atomic)
execute_commands_atomic(commands, si);
else
execute_commands_non_atomic(commands, si);
if (shallow_update)
warn_if_skipped_connectivity_check(commands, si);