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receive-pack: allow pushes that update .git/shallow 

The basic 8 steps to update .git/shallow does not fully apply here
because the user may choose to accept just a few refs (while fetch
always accepts all refs). The steps are modified a bit.

1-6. same as before. After calling assign_shallow_commits_to_refs at
   step 6, each shallow commit has a bitmap that marks all refs that
   require it.

7. mark all "ours" shallow commits that are reachable from any
   refs. We will need to do the original step 7 on them later.

8. go over all shallow commit bitmaps, mark refs that require new
   shallow commits.

9. setup a strict temporary shallow file to plug all the holes, even
   if it may cut some of our history short. This file is used by all
   hooks. The hooks could use --shallow-file=$GIT_DIR/shallow to
   overcome this and reach everything in current repo.

10. go over the new refs one by one. For each ref, do the reachability
   test if it needs a shallow commit on the list from step 7. Remove
   it if it's reachable from our refs. Gather all required shallow
   commits, run check_everything_connected() with the new ref, then
   install them to .git/shallow.

This mode is disabled by default and can be turned on with
receive.shallowupdate

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2013-12-05 20:02:47 +07:00 committed by Junio C Hamano
parent 614db3e292
commit 0a1bc12b6e
5 changed files with 201 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/config.txt
View File

@ -2026,6 +2026,10 @@ receive.updateserverinfo::
If set to true, git-receive-pack will run git-update-server-info
after receiving data from git-push and updating refs.
receive.shallowupdate::
If set to true, .git/shallow can be updated when new refs
require new shallow roots. Otherwise those refs are rejected.
remote.pushdefault::
The remote to push to by default. Overrides
`branch.<name>.remote` for all branches, and is overridden by

163
builtin/receive-pack.c
View File

@ -44,6 +44,7 @@ static int fix_thin = 1;
static const char *head_name;
static void *head_name_to_free;
static int sent_capabilities;
static int shallow_update;
static const char *alt_shallow_file;
static enum deny_action parse_deny_action(const char *var, const char *value)
@ -123,6 +124,11 @@ static int receive_pack_config(const char *var, const char *value, void *cb)
return 0;
}
if (strcmp(var, "receive.shallowupdate") == 0) {
shallow_update = git_config_bool(var, value);
return 0;
}
return git_default_config(var, value, cb);
}
@ -423,7 +429,46 @@ static void refuse_unconfigured_deny_delete_current(void)
rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]);
}
static const char *update(struct command *cmd)
static int command_singleton_iterator(void *cb_data, unsigned char sha1[20]);
static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
{
static struct lock_file shallow_lock;
struct sha1_array extra = SHA1_ARRAY_INIT;
const char *alt_file;
uint32_t mask = 1 << (cmd->index % 32);
int i;
trace_printf_key("GIT_TRACE_SHALLOW",
"shallow: update_shallow_ref %s\n", cmd->ref_name);
for (i = 0; i < si->shallow->nr; i++)
if (si->used_shallow[i] &&
(si->used_shallow[i][cmd->index / 32] & mask) &&
!delayed_reachability_test(si, i))
sha1_array_append(&extra, si->shallow->sha1[i]);
setup_alternate_shallow(&shallow_lock, &alt_file, &extra);
if (check_shallow_connected(command_singleton_iterator,
0, cmd, alt_file)) {
rollback_lock_file(&shallow_lock);
sha1_array_clear(&extra);
return -1;
}
commit_lock_file(&shallow_lock);
/*
* Make sure setup_alternate_shallow() for the next ref does
* not lose these new roots..
*/
for (i = 0; i < extra.nr; i++)
register_shallow(extra.sha1[i]);
si->shallow_ref[cmd->index] = 0;
sha1_array_clear(&extra);
return 0;
}
static const char *update(struct command *cmd, struct shallow_info *si)
{
const char *name = cmd->ref_name;
struct strbuf namespaced_name_buf = STRBUF_INIT;
@ -531,6 +576,10 @@ static const char *update(struct command *cmd)
return NULL; /* good */
}
else {
if (shallow_update && si->shallow_ref[cmd->index] &&
update_shallow_ref(cmd, si))
return "shallow error";
lock = lock_any_ref_for_update(namespaced_name, old_sha1,
0, NULL);
if (!lock) {
@ -671,12 +720,16 @@ static int command_singleton_iterator(void *cb_data, unsigned char sha1[20])
return 0;
}
static void set_connectivity_errors(struct command *commands)
static void set_connectivity_errors(struct command *commands,
struct shallow_info *si)
{
struct command *cmd;
for (cmd = commands; cmd; cmd = cmd->next) {
struct command *singleton = cmd;
if (shallow_update && si->shallow_ref[cmd->index])
/* to be checked in update_shallow_ref() */
continue;
if (!check_everything_connected(command_singleton_iterator,
0, &singleton))
continue;
@ -684,18 +737,26 @@ static void set_connectivity_errors(struct command *commands)
}
}
struct iterate_data {
struct command *cmds;
struct shallow_info *si;
};
static int iterate_receive_command_list(void *cb_data, unsigned char sha1[20])
{
struct command **cmd_list = cb_data;
struct iterate_data *data = cb_data;
struct command **cmd_list = &data->cmds;
struct command *cmd = *cmd_list;
while (cmd) {
for (; cmd; cmd = cmd->next) {
if (shallow_update && data->si->shallow_ref[cmd->index])
/* to be checked in update_shallow_ref() */
continue;
if (!is_null_sha1(cmd->new_sha1) && !cmd->skip_update) {
hashcpy(sha1, cmd->new_sha1);
*cmd_list = cmd->next;
return 0;
}
cmd = cmd->next;
}
*cmd_list = NULL;
return -1; /* end of list */
@ -715,10 +776,14 @@ static void reject_updates_to_hidden(struct command *commands)
}
}
static void execute_commands(struct command *commands, const char *unpacker_error)
static void execute_commands(struct command *commands,
const char *unpacker_error,
struct shallow_info *si)
{
int checked_connectivity;
struct command *cmd;
unsigned char sha1[20];
struct iterate_data data;
if (unpacker_error) {
for (cmd = commands; cmd; cmd = cmd->next)
@ -726,10 +791,10 @@ static void execute_commands(struct command *commands, const char *unpacker_erro
return;
}
cmd = commands;
if (check_everything_connected(iterate_receive_command_list,
0, &cmd))
set_connectivity_errors(commands);
data.cmds = commands;
data.si = si;
if (check_everything_connected(iterate_receive_command_list, 0, &data))
set_connectivity_errors(commands, si);
reject_updates_to_hidden(commands);
@ -746,6 +811,7 @@ static void execute_commands(struct command *commands, const char *unpacker_erro
free(head_name_to_free);
head_name = head_name_to_free = resolve_refdup("HEAD", sha1, 0, NULL);
checked_connectivity = 1;
for (cmd = commands; cmd; cmd = cmd->next) {
if (cmd->error_string)
continue;
@ -753,7 +819,22 @@ static void execute_commands(struct command *commands, const char *unpacker_erro
if (cmd->skip_update)
continue;
cmd->error_string = update(cmd);
cmd->error_string = update(cmd, si);
if (shallow_update && !cmd->error_string &&
si->shallow_ref[cmd->index]) {
error("BUG: connectivity check has not been run on ref %s",
cmd->ref_name);
checked_connectivity = 0;
}
}
if (shallow_update) {
if (!checked_connectivity)
error("BUG: run 'git fsck' for safety.\n"
"If there are errors, try to remove "
"the reported refs above");
if (alt_shallow_file && *alt_shallow_file)
unlink(alt_shallow_file);
}
}
@ -924,6 +1005,53 @@ static const char *unpack_with_sideband(struct shallow_info *si)
return ret;
}
static void prepare_shallow_update(struct command *commands,
struct shallow_info *si)
{
int i, j, k, bitmap_size = (si->ref->nr + 31) / 32;
si->used_shallow = xmalloc(sizeof(*si->used_shallow) *
si->shallow->nr);
assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
si->need_reachability_test =
xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
si->reachable =
xcalloc(si->shallow->nr, sizeof(*si->reachable));
si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
for (i = 0; i < si->nr_ours; i++)
si->need_reachability_test[si->ours[i]] = 1;
for (i = 0; i < si->shallow->nr; i++) {
if (!si->used_shallow[i])
continue;
for (j = 0; j < bitmap_size; j++) {
if (!si->used_shallow[i][j])
continue;
si->need_reachability_test[i]++;
for (k = 0; k < 32; k++)
if (si->used_shallow[i][j] & (1 << k))
si->shallow_ref[j * 32 + k]++;
}
/*
* true for those associated with some refs and belong
* in "ours" list aka "step 7 not done yet"
*/
si->need_reachability_test[i] =
si->need_reachability_test[i] > 1;
}
/*
* keep hooks happy by forcing a temporary shallow file via
* env variable because we can't add --shallow-file to every
* command. check_everything_connected() will be done with
* true .git/shallow though.
*/
setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
}
static void update_shallow_info(struct command *commands,
struct shallow_info *si,
struct sha1_array *ref)
@ -932,8 +1060,10 @@ static void update_shallow_info(struct command *commands,
int *ref_status;
remove_nonexistent_theirs_shallow(si);
/* XXX remove_nonexistent_ours_in_pack() */
if (!si->nr_ours && !si->nr_theirs)
if (!si->nr_ours && !si->nr_theirs) {
shallow_update = 0;
return;
}
for (cmd = commands; cmd; cmd = cmd->next) {
if (is_null_sha1(cmd->new_sha1))
@ -943,6 +1073,11 @@ static void update_shallow_info(struct command *commands,
}
si->ref = ref;
if (shallow_update) {
prepare_shallow_update(commands, si);
return;
}
ref_status = xmalloc(sizeof(*ref_status) * ref->nr);
assign_shallow_commits_to_refs(si, NULL, ref_status);
for (cmd = commands; cmd; cmd = cmd->next) {
@ -1064,11 +1199,13 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
const char *unpack_status = NULL;
prepare_shallow_info(&si, &shallow);
if (!si.nr_ours && !si.nr_theirs)
shallow_update = 0;
if (!delete_only(commands)) {
unpack_status = unpack_with_sideband(&si);
update_shallow_info(commands, &si, &ref);
}
execute_commands(commands, unpack_status);
execute_commands(commands, unpack_status, &si);
if (pack_lockfile)
unlink_or_warn(pack_lockfile);
if (report_status)

9
commit.h
View File

@ -216,6 +216,14 @@ struct shallow_info {
int *ours, nr_ours;
int *theirs, nr_theirs;
struct sha1_array *ref;
/* for receive-pack */
uint32_t **used_shallow;
int *need_reachability_test;
int *reachable;
int *shallow_ref;
struct commit **commits;
int nr_commits;
};
extern void prepare_shallow_info(struct shallow_info *, struct sha1_array *);
@ -226,6 +234,7 @@ extern void remove_nonexistent_ours_in_pack(struct shallow_info *,
extern void assign_shallow_commits_to_refs(struct shallow_info *info,
uint32_t **used,
int *ref_status);
extern int delayed_reachability_test(struct shallow_info *si, int c);
int is_descendant_of(struct commit *, struct commit_list *);
int in_merge_bases(struct commit *, struct commit *);

23
shallow.c
View File

@ -617,3 +617,26 @@ static void post_assign_shallow(struct shallow_info *info,
free(ca.commits);
}
/* (Delayed) step 7, reachability test at commit level */
int delayed_reachability_test(struct shallow_info *si, int c)
{
if (si->need_reachability_test[c]) {
struct commit *commit = lookup_commit(si->shallow->sha1[c]);
if (!si->commits) {
struct commit_array ca;
memset(&ca, 0, sizeof(ca));
head_ref(add_ref, &ca);
for_each_ref(add_ref, &ca);
si->commits = ca.commits;
si->nr_commits = ca.nr;
}
si->reachable[c] = in_merge_bases_many(commit,
si->nr_commits,
si->commits);
si->need_reachability_test[c] = 0;
}
return si->reachable[c];
}

15
t/t5538-push-shallow.sh
View File

@ -67,4 +67,19 @@ test_expect_success 'push from shallow clone, with grafted roots' '
git fsck
'
test_expect_success 'add new shallow root with receive.updateshallow on' '
test_config receive.shallowupdate true &&
(
cd shallow2 &&
git push ../.git +master:refs/remotes/shallow2/master
) &&
git log --format=%s shallow2/master >actual &&
git fsck &&
cat <<EOF >expect &&
c
b
EOF
test_cmp expect actual
'
test_done