From: "Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: vdye@github.com, me@ttaylorr.com, newren@gmail.com,
gitster@pobox.com, Derrick Stolee <derrickstolee@github.com>
Subject: [PATCH 0/3] Create stronger guard rails on replace refs
Date: Fri, 26 May 2023 18:43:34 +0000 [thread overview]
Message-ID: <pull.1537.git.1685126617.gitgitgadget@gmail.com> (raw)
(This series is based on tb/pack-bitmap-traversal-with-boundary due to
wanting to modify prepare_repo_settings() in a similar way.)
The replace-refs can be ignored via the core.useReplaceRefs=false config
setting. This setting is possible to miss in some Git commands if they do
not load default config at the appropriate time. See [1] for a recent
example of this.
[1]
https://lore.kernel.org/git/pull.1530.git.1683745654800.gitgitgadget@gmail.com/
This series aims to avoid this kind of error from happening in the future.
The idea is to encapsulate the setting in such a way that we can guarantee
that config has been checked before using the in-memory value.
Further, we must be careful that some Git commands want to disable replace
refs unconditionally, as if GIT_NO_REPLACE_REFS was enabled in the
environment.
The approach taken here is to split the global into two different sources.
First, read_replace_refs is kept (but moved to replace-objects.c scope) and
reflects whether or not the feature is permitted by the environment and the
current command. Second, a new value is added to repo-settings and this is
checked after using prepare_repo_settings() to guarantee the config has been
read.
This presents a potential behavior change, in that now core.useReplaceRefs
is specific to each in-memory repository instead of applying the
superproject value to all submodules. I could not find a Git command that
has multiple in-memory repositories and follows OIDs to object contents, so
I'm not sure how to demonstrate it in a test.
Here is the breakdown of the series:
* Patch 1 creates disable_replace_refs() to encapsulate the global
disabling of the feature.
* Patch 2 creates replace_refs_enabled() to check if the feature is enabled
(with respect to a given repository). This is a thin wrapper of the
global at this point, but does allow us to remove it from environment.h.
* Patch 3 creates the value in repo-settings as well as ensures that the
repo settings have been prepared before accessing the value within
replace_refs_enabled().
Thanks, -Stolee
Derrick Stolee (3):
repository: create disable_replace_refs()
replace-objects: create wrapper around setting
repository: create read_replace_refs setting
builtin/cat-file.c | 2 +-
builtin/commit-graph.c | 5 ++---
builtin/fsck.c | 2 +-
builtin/index-pack.c | 2 +-
builtin/pack-objects.c | 3 +--
builtin/prune.c | 3 ++-
builtin/replace.c | 3 ++-
builtin/unpack-objects.c | 3 +--
builtin/upload-pack.c | 3 ++-
commit-graph.c | 4 +---
config.c | 5 -----
environment.c | 3 +--
git.c | 2 +-
log-tree.c | 2 +-
replace-object.c | 23 ++++++++++++++++++++++-
replace-object.h | 31 ++++++++++++++++++++++---------
repo-settings.c | 2 ++
repository.h | 8 ++++++++
18 files changed, 71 insertions(+), 35 deletions(-)
base-commit: b0afdce5dab61f224fd66c13768facc36a7f8705
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1537%2Fderrickstolee%2Freplace-refs-safety-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1537/derrickstolee/replace-refs-safety-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/1537
--
gitgitgadget
next reply other threads:[~2023-05-26 18:44 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-26 18:43 Derrick Stolee via GitGitGadget [this message]
2023-05-26 18:43 ` [PATCH 1/3] repository: create disable_replace_refs() Derrick Stolee via GitGitGadget
2023-05-31 4:41 ` Elijah Newren
2023-05-31 13:37 ` Derrick Stolee
2023-06-01 17:47 ` Jeff King
2023-06-03 0:28 ` Junio C Hamano
2023-06-04 6:32 ` Jeff King
2023-06-01 5:23 ` Junio C Hamano
2023-06-01 16:35 ` Victoria Dye
2023-05-26 18:43 ` [PATCH 2/3] replace-objects: create wrapper around setting Derrick Stolee via GitGitGadget
2023-06-01 16:35 ` Victoria Dye
2023-06-01 19:50 ` Derrick Stolee
2023-06-03 1:47 ` Elijah Newren
2023-06-05 15:44 ` Derrick Stolee
2023-05-26 18:43 ` [PATCH 3/3] repository: create read_replace_refs setting Derrick Stolee via GitGitGadget
2023-06-01 16:36 ` Victoria Dye
2023-06-01 19:52 ` Derrick Stolee
2023-05-31 5:11 ` [PATCH 0/3] Create stronger guard rails on replace refs Elijah Newren
2023-06-02 14:29 ` [PATCH v2 " Derrick Stolee via GitGitGadget
2023-06-02 14:29 ` [PATCH v2 1/3] repository: create disable_replace_refs() Derrick Stolee via GitGitGadget
2023-06-02 14:29 ` [PATCH v2 2/3] replace-objects: create wrapper around setting Derrick Stolee via GitGitGadget
2023-06-03 6:22 ` René Scharfe
2023-06-05 13:22 ` Derrick Stolee
2023-06-02 14:29 ` [PATCH v2 3/3] repository: create read_replace_refs setting Derrick Stolee via GitGitGadget
2023-06-05 19:32 ` Victoria Dye
2023-06-03 1:52 ` [PATCH v2 0/3] Create stronger guard rails on replace refs Elijah Newren
2023-06-06 13:24 ` [PATCH v3 " Derrick Stolee via GitGitGadget
2023-06-06 13:24 ` [PATCH v3 1/3] repository: create disable_replace_refs() Derrick Stolee via GitGitGadget
2023-06-06 13:24 ` [PATCH v3 2/3] replace-objects: create wrapper around setting Derrick Stolee via GitGitGadget
2023-06-06 13:24 ` [PATCH v3 3/3] repository: create read_replace_refs setting Derrick Stolee via GitGitGadget
2023-06-06 16:15 ` [PATCH v3 0/3] Create stronger guard rails on replace refs Victoria Dye
2023-06-12 20:45 ` Junio C Hamano
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