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Merge branch 'js/maint-receive-pack-symref-alias'
* js/maint-receive-pack-symref-alias: t5516-fetch-push.sh: style cleanup receive-pack: detect aliased updates which can occur with symrefs receive-pack: switch global variable 'commands' to a parameter Conflicts: t/t5516-fetch-push.sh
2 parents 035bf8d + d4785cd commit 9215f76

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2 files changed

+186
-60
lines changed

2 files changed

+186
-60
lines changed

‎builtin/receive-pack.c‎

Lines changed: 91 additions & 37 deletions
Original file line numberDiff line numberDiff line change
@@ -9,6 +9,7 @@
99
#include "object.h"
1010
#include "remote.h"
1111
#include "transport.h"
12+
#include "string-list.h"
1213

1314
static const char receive_pack_usage[] = "git receive-pack <git-dir>";
1415

@@ -129,13 +130,12 @@ static void write_head_info(void)
129130
struct command {
130131
struct command *next;
131132
const char *error_string;
133+
unsigned int skip_update;
132134
unsigned char old_sha1[20];
133135
unsigned char new_sha1[20];
134136
char ref_name[FLEX_ARRAY]; /* more */
135137
};
136138

137-
static struct command *commands;
138-
139139
static const char pre_receive_hook[] = "hooks/pre-receive";
140140
static const char post_receive_hook[] = "hooks/post-receive";
141141

@@ -188,7 +188,7 @@ static int copy_to_sideband(int in, int out, void *arg)
188188
return 0;
189189
}
190190

191-
static int run_receive_hook(const char *hook_name)
191+
static int run_receive_hook(struct command *commands, const char *hook_name)
192192
{
193193
static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
194194
struct command *cmd;
@@ -447,15 +447,15 @@ static const char *update(struct command *cmd)
447447

448448
static char update_post_hook[] = "hooks/post-update";
449449

450-
static void run_update_post_hook(struct command *cmd)
450+
static void run_update_post_hook(struct command *commands)
451451
{
452-
struct command *cmd_p;
452+
struct command *cmd;
453453
int argc;
454454
const char **argv;
455455
struct child_process proc;
456456

457-
for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
458-
if (cmd_p->error_string)
457+
for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
458+
if (cmd->error_string)
459459
continue;
460460
argc++;
461461
}
@@ -464,12 +464,12 @@ static void run_update_post_hook(struct command *cmd)
464464
argv = xmalloc(sizeof(*argv) * (2 + argc));
465465
argv[0] = update_post_hook;
466466

467-
for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
467+
for (argc = 1, cmd = commands; cmd; cmd = cmd->next) {
468468
char *p;
469-
if (cmd_p->error_string)
469+
if (cmd->error_string)
470470
continue;
471-
p = xmalloc(strlen(cmd_p->ref_name) + 1);
472-
strcpy(p, cmd_p->ref_name);
471+
p = xmalloc(strlen(cmd->ref_name) + 1);
472+
strcpy(p, cmd->ref_name);
473473
argv[argc] = p;
474474
argc++;
475475
}
@@ -488,37 +488,92 @@ static void run_update_post_hook(struct command *cmd)
488488
}
489489
}
490490

491-
static void execute_commands(const char *unpacker_error)
491+
static void check_aliased_update(struct command *cmd, struct string_list *list)
492+
{
493+
struct string_list_item *item;
494+
struct command *dst_cmd;
495+
unsigned char sha1[20];
496+
char cmd_oldh[41], cmd_newh[41], dst_oldh[41], dst_newh[41];
497+
int flag;
498+
499+
const char *dst_name = resolve_ref(cmd->ref_name, sha1, 0, &flag);
500+
501+
if (!(flag & REF_ISSYMREF))
502+
return;
503+
504+
if ((item = string_list_lookup(dst_name, list)) == NULL)
505+
return;
506+
507+
cmd->skip_update = 1;
508+
509+
dst_cmd = (struct command *) item->util;
510+
511+
if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
512+
!hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
513+
return;
514+
515+
dst_cmd->skip_update = 1;
516+
517+
strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
518+
strcat(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
519+
strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
520+
strcat(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
521+
rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
522+
" its target '%s' (%s..%s)",
523+
cmd->ref_name, cmd_oldh, cmd_newh,
524+
dst_cmd->ref_name, dst_oldh, dst_newh);
525+
526+
cmd->error_string = dst_cmd->error_string =
527+
"inconsistent aliased update";
528+
}
529+
530+
static void check_aliased_updates(struct command *commands)
531+
{
532+
struct command *cmd;
533+
struct string_list ref_list = { NULL, 0, 0, 0 };
534+
535+
for (cmd = commands; cmd; cmd = cmd->next) {
536+
struct string_list_item *item =
537+
string_list_append(cmd->ref_name, &ref_list);
538+
item->util = (void *)cmd;
539+
}
540+
sort_string_list(&ref_list);
541+
542+
for (cmd = commands; cmd; cmd = cmd->next)
543+
check_aliased_update(cmd, &ref_list);
544+
545+
string_list_clear(&ref_list, 0);
546+
}
547+
548+
static void execute_commands(struct command *commands, const char *unpacker_error)
492549
{
493-
struct command *cmd = commands;
550+
struct command *cmd;
494551
unsigned char sha1[20];
495552

496553
if (unpacker_error) {
497-
while (cmd) {
554+
for (cmd = commands; cmd; cmd = cmd->next)
498555
cmd->error_string = "n/a (unpacker error)";
499-
cmd = cmd->next;
500-
}
501556
return;
502557
}
503558

504-
if (run_receive_hook(pre_receive_hook)) {
505-
while (cmd) {
559+
if (run_receive_hook(commands, pre_receive_hook)) {
560+
for (cmd = commands; cmd; cmd = cmd->next)
506561
cmd->error_string = "pre-receive hook declined";
507-
cmd = cmd->next;
508-
}
509562
return;
510563
}
511564

565+
check_aliased_updates(commands);
566+
512567
head_name = resolve_ref("HEAD", sha1, 0, NULL);
513568

514-
while (cmd) {
515-
cmd->error_string = update(cmd);
516-
cmd = cmd->next;
517-
}
569+
for (cmd = commands; cmd; cmd = cmd->next)
570+
if (!cmd->skip_update)
571+
cmd->error_string = update(cmd);
518572
}
519573

520-
static void read_head_info(void)
574+
static struct command *read_head_info(void)
521575
{
576+
struct command *commands = NULL;
522577
struct command **p = &commands;
523578
for (;;) {
524579
static char line[1000];
@@ -548,15 +603,14 @@ static void read_head_info(void)
548603
if (strstr(refname + reflen + 1, "side-band-64k"))
549604
use_sideband = LARGE_PACKET_MAX;
550605
}
551-
cmd = xmalloc(sizeof(struct command) + len - 80);
606+
cmd = xcalloc(1, sizeof(struct command) + len - 80);
552607
hashcpy(cmd->old_sha1, old_sha1);
553608
hashcpy(cmd->new_sha1, new_sha1);
554609
memcpy(cmd->ref_name, line + 82, len - 81);
555-
cmd->error_string = NULL;
556-
cmd->next = NULL;
557610
*p = cmd;
558611
p = &cmd->next;
559612
}
613+
return commands;
560614
}
561615

562616
static const char *parse_pack_header(struct pack_header *hdr)
@@ -643,7 +697,7 @@ static const char *unpack(void)
643697
}
644698
}
645699

646-
static void report(const char *unpack_status)
700+
static void report(struct command *commands, const char *unpack_status)
647701
{
648702
struct command *cmd;
649703
struct strbuf buf = STRBUF_INIT;
@@ -667,12 +721,12 @@ static void report(const char *unpack_status)
667721
strbuf_release(&buf);
668722
}
669723

670-
static int delete_only(struct command *cmd)
724+
static int delete_only(struct command *commands)
671725
{
672-
while (cmd) {
726+
struct command *cmd;
727+
for (cmd = commands; cmd; cmd = cmd->next) {
673728
if (!is_null_sha1(cmd->new_sha1))
674729
return 0;
675-
cmd = cmd->next;
676730
}
677731
return 1;
678732
}
@@ -722,6 +776,7 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
722776
int stateless_rpc = 0;
723777
int i;
724778
char *dir = NULL;
779+
struct command *commands;
725780

726781
argv++;
727782
for (i = 1; i < argc; i++) {
@@ -772,18 +827,17 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
772827
if (advertise_refs)
773828
return 0;
774829

775-
read_head_info();
776-
if (commands) {
830+
if ((commands = read_head_info()) != NULL) {
777831
const char *unpack_status = NULL;
778832

779833
if (!delete_only(commands))
780834
unpack_status = unpack();
781-
execute_commands(unpack_status);
835+
execute_commands(commands, unpack_status);
782836
if (pack_lockfile)
783837
unlink_or_warn(pack_lockfile);
784838
if (report_status)
785-
report(unpack_status);
786-
run_receive_hook(post_receive_hook);
839+
report(commands, unpack_status);
840+
run_receive_hook(commands, post_receive_hook);
787841
run_update_post_hook(commands);
788842
if (auto_gc) {
789843
const char *argv_gc_auto[] = {

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