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receive-pack: detect aliased updates which can occur with symrefs
When pushing to a remote repo the sending side filters out aliased
updates (e.g., foo:baz bar:baz). However, it is not possible for the
sender to know if two refs are aliased on the receiving side via
symrefs. Here is one such scenario:
$ git init origin
$ (cd origin && touch file && git add file && git commit -a -m intial)
$ git clone --bare origin origin.git
$ rm -rf origin
$ git clone origin.git client
$ git clone --mirror client backup.git &&
$ (cd backup.git && git remote set-head origin --auto)
$ (cd client &&
git remote add --mirror backup ../backup.git &&
echo change1 > file && git commit -a -m change1 &&
git push origin &&
git push backup
)
The push to backup fails with:
Counting objects: 5, done.
Writing objects: 100% (3/3), 244 bytes, done.
Total 3 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
error: Ref refs/remotes/origin/master is at ef3... but expected 262...
remote: error: failed to lock refs/remotes/origin/master
To ../backup.git
262cd57..ef307ff master -> master
262cd57..ef307ff origin/HEAD -> origin/HEAD
! [remote rejected] origin/master -> origin/master (failed to lock)
error: failed to push some refs to '../backup.git'
The reason is that refs/remotes/origin/HEAD is a symref to
refs/remotes/origin/master, but it is not possible for the sending side
to unambiguously know this.
This commit fixes the issue by having receive-pack ignore any update to
a symref whose target is being identically updated. If a symref and its
target are being updated inconsistently, then the update for both fails
with an error message ("refusing inconsistent update...") to help
diagnose the situation.
Signed-off-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jay Soffian
Junio C Hamano
parent
5e1c71fd14
commit
da3efdb17b
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@ -9,6 +9,7 @@
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#include "object.h"
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#include "remote.h"
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#include "transport.h"
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#include "string-list.h"
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static const char receive_pack_usage[] = "git receive-pack <git-dir>";
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@ -129,6 +130,7 @@ static void write_head_info(void)
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struct command {
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struct command *next;
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const char *error_string;
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unsigned int skip_update;
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unsigned char old_sha1[20];
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unsigned char new_sha1[20];
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char ref_name[FLEX_ARRAY]; /* more */
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@ -486,6 +488,63 @@ static void run_update_post_hook(struct command *commands)
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}
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}
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static void check_aliased_update(struct command *cmd, struct string_list *list)
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{
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struct string_list_item *item;
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struct command *dst_cmd;
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unsigned char sha1[20];
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char cmd_oldh[41], cmd_newh[41], dst_oldh[41], dst_newh[41];
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int flag;
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const char *dst_name = resolve_ref(cmd->ref_name, sha1, 0, &flag);
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if (!(flag & REF_ISSYMREF))
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return;
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if ((item = string_list_lookup(dst_name, list)) == NULL)
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return;
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cmd->skip_update = 1;
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dst_cmd = (struct command *) item->util;
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if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
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!hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
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return;
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dst_cmd->skip_update = 1;
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strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
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strcat(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
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strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
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strcat(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
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rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
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" its target '%s' (%s..%s)",
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cmd->ref_name, cmd_oldh, cmd_newh,
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dst_cmd->ref_name, dst_oldh, dst_newh);
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cmd->error_string = dst_cmd->error_string =
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"inconsistent aliased update";
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}
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static void check_aliased_updates(struct command *commands)
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{
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struct command *cmd;
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struct string_list ref_list = { NULL, 0, 0, 0 };
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for (cmd = commands; cmd; cmd = cmd->next) {
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struct string_list_item *item =
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string_list_append(cmd->ref_name, &ref_list);
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item->util = (void *)cmd;
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}
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sort_string_list(&ref_list);
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for (cmd = commands; cmd; cmd = cmd->next)
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check_aliased_update(cmd, &ref_list);
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string_list_clear(&ref_list, 0);
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}
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static void execute_commands(struct command *commands, const char *unpacker_error)
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{
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struct command *cmd;
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@ -503,10 +562,13 @@ static void execute_commands(struct command *commands, const char *unpacker_erro
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return;
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}
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check_aliased_updates(commands);
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head_name = resolve_ref("HEAD", sha1, 0, NULL);
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for (cmd = commands; cmd; cmd = cmd->next)
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cmd->error_string = update(cmd);
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if (!cmd->skip_update)
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cmd->error_string = update(cmd);
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}
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static struct command *read_head_info(void)
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@ -541,12 +603,10 @@ static struct command *read_head_info(void)
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if (strstr(refname + reflen + 1, "side-band-64k"))
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use_sideband = LARGE_PACKET_MAX;
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}
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cmd = xmalloc(sizeof(struct command) + len - 80);
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cmd = xcalloc(1, sizeof(struct command) + len - 80);
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hashcpy(cmd->old_sha1, old_sha1);
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hashcpy(cmd->new_sha1, new_sha1);
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memcpy(cmd->ref_name, line + 82, len - 81);
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cmd->error_string = NULL;
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cmd->next = NULL;
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*p = cmd;
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p = &cmd->next;
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}
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@ -660,4 +660,53 @@ test_expect_success 'push with branches containing #' '
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git checkout master
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'
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test_expect_success 'push into aliased refs (consistent)' '
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mk_test heads/master &&
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mk_child child1 &&
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mk_child child2 &&
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(
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cd child1 &&
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git branch foo &&
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git symbolic-ref refs/heads/bar refs/heads/foo
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git config receive.denyCurrentBranch false
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) &&
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(
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cd child2 &&
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>path2 &&
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git add path2 &&
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test_tick &&
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git commit -a -m child2 &&
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git branch foo &&
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git branch bar &&
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git push ../child1 foo bar
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)
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'
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test_expect_success 'push into aliased refs (inconsistent)' '
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mk_test heads/master &&
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mk_child child1 &&
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mk_child child2 &&
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(
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cd child1 &&
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git branch foo &&
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git symbolic-ref refs/heads/bar refs/heads/foo
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git config receive.denyCurrentBranch false
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) &&
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(
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cd child2 &&
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>path2 &&
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git add path2 &&
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test_tick &&
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git commit -a -m child2 &&
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git branch foo &&
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>path3 &&
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git add path3 &&
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test_tick &&
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git commit -a -m child2 &&
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git branch bar &&
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test_must_fail git push ../child1 foo bar 2>stderr &&
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grep "refusing inconsistent update" stderr
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)
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'
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test_done
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