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-rw-r--r--builtin/receive-pack.c329
1 files changed, 261 insertions, 68 deletions
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index e3eb5fc..85bba35 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -8,10 +8,12 @@
#include "commit.h"
#include "object.h"
#include "remote.h"
+#include "connect.h"
#include "transport.h"
#include "string-list.h"
#include "sha1-array.h"
#include "connected.h"
+#include "argv-array.h"
#include "version.h"
static const char receive_pack_usage[] = "git receive-pack <git-dir>";
@@ -38,9 +40,12 @@ static int quiet;
static int prefer_ofs_delta = 1;
static int auto_update_server_info;
static int auto_gc = 1;
+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)
{
@@ -119,6 +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);
}
@@ -176,6 +186,8 @@ static void write_head_info(void)
if (!sent_capabilities)
show_ref("capabilities^{}", null_sha1);
+ advertise_shallow_grafts(1);
+
/* EOF */
packet_flush(1);
}
@@ -185,6 +197,7 @@ struct command {
const char *error_string;
unsigned int skip_update:1,
did_not_exist:1;
+ int index;
unsigned char old_sha1[20];
unsigned char new_sha1[20];
char ref_name[FLEX_ARRAY]; /* more */
@@ -416,7 +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;
@@ -426,7 +478,7 @@ static const char *update(struct command *cmd)
struct ref_lock *lock;
/* only refs/... are allowed */
- if (prefixcmp(name, "refs/") || check_refname_format(name + 5, 0)) {
+ if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
rp_error("refusing to create funny ref '%s' remotely", name);
return "funny refname";
}
@@ -457,7 +509,7 @@ static const char *update(struct command *cmd)
}
if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
- if (deny_deletes && !prefixcmp(name, "refs/heads/")) {
+ if (deny_deletes && starts_with(name, "refs/heads/")) {
rp_error("denying ref deletion for %s", name);
return "deletion prohibited";
}
@@ -481,7 +533,7 @@ static const char *update(struct command *cmd)
if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
!is_null_sha1(old_sha1) &&
- !prefixcmp(name, "refs/heads/")) {
+ starts_with(name, "refs/heads/")) {
struct object *old_object, *new_object;
struct commit *old_commit, *new_commit;
@@ -524,7 +576,12 @@ static const char *update(struct command *cmd)
return NULL; /* good */
}
else {
- lock = lock_any_ref_for_update(namespaced_name, old_sha1, 0);
+ 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) {
rp_error("failed to lock %s", name);
return "failed to lock";
@@ -663,12 +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;
@@ -676,18 +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) {
- if (!is_null_sha1(cmd->new_sha1)) {
+ 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 */
@@ -707,10 +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)
@@ -718,10 +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);
@@ -738,6 +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;
@@ -745,11 +819,26 @@ 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);
}
}
-static struct command *read_head_info(void)
+static struct command *read_head_info(struct sha1_array *shallow)
{
struct command *commands = NULL;
struct command **p = &commands;
@@ -763,6 +852,14 @@ static struct command *read_head_info(void)
line = packet_read_line(0, &len);
if (!line)
break;
+
+ if (len == 48 && starts_with(line, "shallow ")) {
+ if (get_sha1_hex(line + 8, old_sha1))
+ die("protocol error: expected shallow sha, got '%s'", line + 8);
+ sha1_array_append(shallow, old_sha1);
+ continue;
+ }
+
if (len < 83 ||
line[40] != ' ' ||
line[81] != ' ' ||
@@ -814,11 +911,14 @@ static const char *parse_pack_header(struct pack_header *hdr)
static const char *pack_lockfile;
-static const char *unpack(int err_fd)
+static const char *unpack(int err_fd, struct shallow_info *si)
{
struct pack_header hdr;
+ struct argv_array av = ARGV_ARRAY_INIT;
const char *hdr_err;
+ int status;
char hdr_arg[38];
+ struct child_process child;
int fsck_objects = (receive_fsck_objects >= 0
? receive_fsck_objects
: transfer_fsck_objects >= 0
@@ -835,71 +935,63 @@ static const char *unpack(int err_fd)
"--pack_header=%"PRIu32",%"PRIu32,
ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
+ if (si->nr_ours || si->nr_theirs) {
+ alt_shallow_file = setup_temporary_shallow(si->shallow);
+ argv_array_pushl(&av, "--shallow-file", alt_shallow_file, NULL);
+ }
+
+ memset(&child, 0, sizeof(child));
if (ntohl(hdr.hdr_entries) < unpack_limit) {
- int code, i = 0;
- struct child_process child;
- const char *unpacker[5];
- unpacker[i++] = "unpack-objects";
+ argv_array_pushl(&av, "unpack-objects", hdr_arg, NULL);
if (quiet)
- unpacker[i++] = "-q";
+ argv_array_push(&av, "-q");
if (fsck_objects)
- unpacker[i++] = "--strict";
- unpacker[i++] = hdr_arg;
- unpacker[i++] = NULL;
- memset(&child, 0, sizeof(child));
- child.argv = unpacker;
+ argv_array_push(&av, "--strict");
+ child.argv = av.argv;
child.no_stdout = 1;
child.err = err_fd;
child.git_cmd = 1;
- code = run_command(&child);
- if (!code)
- return NULL;
- return "unpack-objects abnormal exit";
+ status = run_command(&child);
+ if (status)
+ return "unpack-objects abnormal exit";
} else {
- const char *keeper[7];
- int s, status, i = 0;
+ int s;
char keep_arg[256];
- struct child_process ip;
s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
strcpy(keep_arg + s, "localhost");
- keeper[i++] = "index-pack";
- keeper[i++] = "--stdin";
+ argv_array_pushl(&av, "index-pack",
+ "--stdin", hdr_arg, keep_arg, NULL);
if (fsck_objects)
- keeper[i++] = "--strict";
- keeper[i++] = "--fix-thin";
- keeper[i++] = hdr_arg;
- keeper[i++] = keep_arg;
- keeper[i++] = NULL;
- memset(&ip, 0, sizeof(ip));
- ip.argv = keeper;
- ip.out = -1;
- ip.err = err_fd;
- ip.git_cmd = 1;
- status = start_command(&ip);
- if (status) {
+ argv_array_push(&av, "--strict");
+ if (fix_thin)
+ argv_array_push(&av, "--fix-thin");
+ child.argv = av.argv;
+ child.out = -1;
+ child.err = err_fd;
+ child.git_cmd = 1;
+ status = start_command(&child);
+ if (status)
return "index-pack fork failed";
- }
- pack_lockfile = index_pack_lockfile(ip.out);
- close(ip.out);
- status = finish_command(&ip);
- if (!status) {
- reprepare_packed_git();
- return NULL;
- }
- return "index-pack abnormal exit";
+ pack_lockfile = index_pack_lockfile(child.out);
+ close(child.out);
+ status = finish_command(&child);
+ if (status)
+ return "index-pack abnormal exit";
+ reprepare_packed_git();
}
+ return NULL;
}
-static const char *unpack_with_sideband(void)
+static const char *unpack_with_sideband(struct shallow_info *si)
{
struct async muxer;
const char *ret;
if (!use_sideband)
- return unpack(0);
+ return unpack(0, si);
memset(&muxer, 0, sizeof(muxer));
muxer.proc = copy_to_sideband;
@@ -907,12 +999,101 @@ static const char *unpack_with_sideband(void)
if (start_async(&muxer))
return NULL;
- ret = unpack(muxer.in);
+ ret = unpack(muxer.in, si);
finish_async(&muxer);
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)
+{
+ struct command *cmd;
+ int *ref_status;
+ remove_nonexistent_theirs_shallow(si);
+ 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))
+ continue;
+ sha1_array_append(ref, cmd->new_sha1);
+ cmd->index = ref->nr - 1;
+ }
+ 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) {
+ if (is_null_sha1(cmd->new_sha1))
+ continue;
+ if (ref_status[cmd->index]) {
+ cmd->error_string = "shallow update not allowed";
+ cmd->skip_update = 1;
+ }
+ }
+ if (alt_shallow_file && *alt_shallow_file) {
+ unlink(alt_shallow_file);
+ alt_shallow_file = NULL;
+ }
+ free(ref_status);
+}
+
static void report(struct command *commands, const char *unpack_status)
{
struct command *cmd;
@@ -954,6 +1135,9 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
int i;
char *dir = NULL;
struct command *commands;
+ struct sha1_array shallow = SHA1_ARRAY_INIT;
+ struct sha1_array ref = SHA1_ARRAY_INIT;
+ struct shallow_info si;
packet_trace_identity("receive-pack");
@@ -975,6 +1159,10 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
stateless_rpc = 1;
continue;
}
+ if (!strcmp(arg, "--reject-thin-pack-for-testing")) {
+ fix_thin = 0;
+ continue;
+ }
usage(receive_pack_usage);
}
@@ -990,9 +1178,6 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
if (!enter_repo(dir, 0))
die("'%s' does not appear to be a git repository", dir);
- if (is_repository_shallow())
- die("attempt to push into a shallow repository");
-
git_config(receive_pack_config, NULL);
if (0 <= transfer_unpack_limit)
@@ -1006,12 +1191,17 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
if (advertise_refs)
return 0;
- if ((commands = read_head_info()) != NULL) {
+ if ((commands = read_head_info(&shallow)) != NULL) {
const char *unpack_status = NULL;
- if (!delete_only(commands))
- unpack_status = unpack_with_sideband();
- execute_commands(commands, unpack_status);
+ 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, &si);
if (pack_lockfile)
unlink_or_warn(pack_lockfile);
if (report_status)
@@ -1027,8 +1217,11 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
}
if (auto_update_server_info)
update_server_info(0);
+ clear_shallow_info(&si);
}
if (use_sideband)
packet_flush(1);
+ sha1_array_clear(&shallow);
+ sha1_array_clear(&ref);
return 0;
}
generated by cgit v0.10.2-6-g49f6 at 2024-04-19 00:11:53 (GMT)