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chriscool and others added 18 commits September 8, 2025 10:30
In a following commit, we will use the new 'promisor-remote' protocol
capability introduced by d460267 (Add 'promisor-remote' capability
to protocol v2, 2025-02-18) to pass and process more information
about promisor remotes than just their name and url.

For that purpose, we will need to store information about other
fields, especially information that might or might not be available
for different promisor remotes. Unfortunately using 'struct strvec',
as we currently do, to store information about the promisor remotes
with one 'struct strvec' for each field like "name" or "url" does not
scale easily in that case. We would need one 'struct strvec' for each
new field, and then we would have to pass all these 'struct strvec'
around.

Let's refactor this and introduce a new 'struct promisor_info'.

It will only store promisor remote information in its members. For now
it has only a 'name' member for the promisor remote name and an 'url'
member for its URL. We will use a 'struct string_list' to store the
instances of 'struct promisor_info'. For each 'item' in the
string_list, 'item->string' will point to the promisor remote name and
'item->util' will point to the corresponding 'struct promisor_info'
instance.

Explicit members are used within 'struct promisor_info' for type
safety and clarity regarding the specific information being handled,
rather than a generic key-value store. We want to specify and document
each field and its content, so adding new members to the struct as
more fields are supported is fine.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
For now the "promisor-remote" protocol capability can only pass "name"
and "url" information from a server to a client in the form
"name=<remote_name>,url=<remote_url>".

To allow clients to make more informed decisions about which promisor
remotes they accept, let's make it possible to pass more information
by introducing a new "promisor.sendFields" configuration variable.

On the server side, information about a remote `foo` is stored in
configuration variables named `remote.foo.<variable-name>`. To make
it clearer and simpler, we use `field` and `field name` like this:

  * `field name` refers to the <variable-name> part of such a
    configuration variable, and

  * `field` refers to both the `field name` and the value of such a
    configuration variable.

The "promisor.sendFields" configuration variable should contain a
comma or space separated list of field names that will be looked up
in the configuration of the remote on the server to find the values
that will be passed to the client.

Only a set of predefined field names are allowed. The only field
names in this set are "partialCloneFilter" and "token". The
"partialCloneFilter" field name specifies the filter definition used
by the promisor remote, and the "token" field name can provide an
authentication credential for accessing it.

For example, if "promisor.sendFields" is set to "partialCloneFilter",
and the server has the "remote.foo.partialCloneFilter" config
variable set to a value, then that value will be passed in the
"partialCloneFilter" field in the form "partialCloneFilter=<value>"
after the "name" and "url" fields.

A following commit will allow the client to use the information to
decide if it accepts the remote or not. For now the client doesn't do
anything with the additional information it receives.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
A previous commit started to define `promisor_field_filter` and
`promisor_field_token`, and used them instead of the
"partialCloneFilter" and "token" string literals.

Let's do the same for "name" and "url" to avoid repeating them
several times and for consistency with the other fields.

For skipping "name=" or "url=" in advertisements, let's introduce
a skip_field_name_prefix() helper function to keep parsing clean
and easy to understand.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In a follow up commit we are going to parse more fields, like a filter
and a token, coming from the server when it advertises promisor remotes
using the "promisor-remote" capability.

To prepare for this, let's refactor the code that parses the advertised
fields coming from the server into a new parse_one_advertised_remote()
function that will populate a `struct promisor_info` with the content
of the fields it parsed.

While at it, let's also pass this `struct promisor_info` to the
should_accept_remote() function, instead of passing it the parsed name
and url.

These changes will make it simpler to both parse more fields and access
the content of these parsed fields in follow up commits.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
A previous commit introduced a new parse_one_advertised_remote()
function that takes a `const char *` argument. This function is called
from filter_promisor_remote() and parses all the fields for one remote.

This means that in filter_promisor_remote() we no longer need to split
the remote information that will be passed to
parse_one_advertised_remote() into an array of relatively heavy and
complex `struct strbuf`.

To use something lighter, let's then replace strbuf_split_str() with
string_list_split() in filter_promisor_remote() to parse the remote
information that is passed to parse_one_advertised_remote().

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
A previous commit allowed a server to pass additional fields through
the "promisor-remote" protocol capability after the "name" and "url"
fields, specifically the "partialCloneFilter" and "token" fields.

Let's make it possible for a client to check if these fields match
what it expects before accepting a promisor remote.

We allow this by introducing a new "promisor.checkFields"
configuration variable. It should contain a comma or space separated
list of fields that will be checked.

By limiting the protocol to specific well-defined fields, we ensure
both server and client have a shared understanding of field
semantics and usage.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Previous commits replaced some strbuf_split*() calls with calls to
string_list_split*() in "promisor-remote.c".

For consistency, let's also replace the strbuf_split_str() call in
mark_remotes_as_accepted() with a call to string_list_split(), as we
don't need the splitted strings to be managed by a `struct strbuf`.
Using the lighter-weight `string_list` API is enough for our needs.

While at it let's remove a useless call to `strbuf_strip_suffix()`.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
After a partial stash, we may clear out the working tree by capturing
the output of diff-tree and piping it into git-apply (and likewise we
may use diff-index to restore the index). So we most definitely do not
want color diff output from that diff-tree process.  And it normally
would not produce any, since its stdout is not going to a tty, and the
default value of color.ui is "auto".

However, if GIT_PAGER_IN_USE is set in the environment, that overrides
the tty check, and we'll produce a colorized diff that chokes git-apply:

  $ echo y | GIT_PAGER_IN_USE=1 git stash -p
  [...]
  Saved working directory and index state WIP on main: 4f2e2bb foo
  error: No valid patches in input (allow with "--allow-empty")
  Cannot remove worktree changes

Setting this variable is a relatively silly thing to do, and not
something most users would run into. But we sometimes do it in our tests
to stimulate color. And it is a user-visible bug, so let's fix it rather
than work around it in the tests.

The root issue here is that diff-tree (and other diff plumbing) should
probably not ever produce color by default. It does so not by parsing
color.ui, but because of the baked-in "auto" default from 4c7f181
(make color.ui default to 'auto', 2013-06-10). But changing that is
risky; we've had discussions back and forth on the topic over the years.
E.g.:

  https://lore.kernel.org/git/86D0A377-8AFD-460D-A90E-6327C6934DFC@gmail.com/.

So let's accept that as the status quo for now and protect ourselves by
passing --no-color to the child processes. This is the same thing we did
for add-interactive itself in 1c6ffb5 (add--interactive.perl: specify
--no-color explicitly, 2020-09-07).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The old perl git-add--interactive.perl script used the color.diff config
option to decide whether to color diffs (and if not set, it fell back to
the value of color.ui via git-config's --get-colorbool option). When we
switched to the builtin version, this was lost: we respect only
color.ui. So for example:

  git -c color.diff=false add -p

would color the diff, even when it should not.

The culprit is this line in add-interactive.c's parse_diff():

  if (want_color_fd(1, -1))

That "-1" means "no config has been set", which causes it to fall back
to the color.ui setting. We should instead be passing the value of
color.diff. But the problem is that we never even parse that config
option!

Instead the builtin interactive code parses only the value of
color.interactive, which is used for prompts and other messages. One
could perhaps argue that this should cover interactive diff coloring,
too, but historically it did not. The perl script treated
color.interactive and color.diff separately. So we should grab the
values for both, keeping separate fields in our add_i_state variable,
rather than a single use_color field.

We also load individual color slots (e.g., color.interactive.prompt),
leaving them as the empty string when color is disabled. This happens
via the init_color() helper in add-interactive, which checks that
use_color field. Now that there are two such fields, we need to pass the
appropriate one for each color.

The colors are mostly easy to divide up; color.interactive.* follows
color.interactive, and color.diff.* follows color.diff. But the "reset"
color is tricky. It is used for both types of coloring, but the two can
be configured independently. So we introduce two separate reset colors,
and use each in the appropriate spot.

There are two new tests. The first enables interactive prompt colors but
disables color.diff. We should see a colored prompt but not a colored
diff, showing that we are now respecting color.diff (and not
color.interactive or color.ui).

The second does the opposite. We disable color.interactive but turn on
color.diff with a custom fragment color. When we split a hunk, the
interactive code has to re-color the hunk header, which lets us check
that we correctly loaded the color.diff.frag config based on color.diff,
not color.interactive.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Color options like color.interactive and color.diff should fall back to
the value of color.ui if they aren't set. In add-interactive, we check
the specific options (e.g., color.diff) via repo_config_get_value(),
which does not depend on the main command having loaded any color config
via the git_config() callback mechanism.

But then we call want_color() on the result; if our specific config is
unset then that function uses the value of git_use_color_default. That
variable is typically set from color.ui by the git_color_config()
callback, which is called by the main command in its own git_config()
callback function.

This works fine for "add -p", whose add_config() callback calls into
git_color_config(). But it doesn't work for other commands like
"checkout -p", which is otherwise unaware of color at all. People tend
not to notice because the default is "auto", and that's what they'd set
color.ui to as well. But something like:

  git -c color.ui=false checkout -p

should disable color, and it doesn't.

This regression goes back to 0527ccb (add -i: default to the built-in
implementation, 2021-11-30). In the perl version we got the color config
from "git config --get-colorbool", which did the full lookup for us.

The obvious fix is for git-checkout to add a call to git_color_config()
to its own config callback. But we'd have to do so for every command
with this problem, which is error-prone. Let's see if we can fix it more
centrally.

It is tempting to teach want_color() to look up the value of
repo_config_get_value("color.ui") itself. But I think that would have
disastrous consequences. Plumbing commands, especially older ones, avoid
porcelain config like "color.*" by simply not parsing it in their config
callbacks. Looking up the value of color.ui under the hood would
undermine that.

Instead, let's do that lookup in the add-interactive setup code. We're
already demand-loading other color config there, which is probably fine
(even in a plumbing command like "git reset", the interactive mode is
inherently porcelain-ish). That catches all commands that use the
interactive code, whether they were calling git_color_config()
themselves or not.

Reported-by: Isaac Oscar Gariano <isaacoscar@live.com.au>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When the README for diff-highlight was written, there was no way to
trigger it for the `add -p` interactive patch mode. We've since grown a
feature to support that, but it was documented only on the Git side.
Let's also let people coming the other direction, from diff-highlight,
know that it's an option.

Suggested-by: Isaac Oscar Gariano <IsaacOscar@live.com.au>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
get_oid_with_context() allows specifying flags and reports object
details via a passed-in struct object_context.  Some callers just want
to specify flags, but don't need any details back.  Convert them to
repo_get_oid_with_flags(), which provides just that and frees them from
dealing with the context structure.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
98ba49c (subtree: fix split processing with multiple subtrees
present, 2023-12-01) increases the performance of

    git subtree split --prefix=subA

by ignoring subtree merges which are outside of `subA/`. It also
introduces a regression. Subtree merges that should be retained
are incorrectly ignored if they:

1. are nested under `subA/`; and
2. are merged with `--squash`.

For example, a subtree merged like:

    git subtree merge --squash --prefix=subA/subB "$rev"
    #                 ^^^^^^^^          ^^^^

is erroneously ignored during a split of `subA`. This causes
missing tree files and different commit hashes starting in
git v2.44.0-rc0.

The method:

    should_ignore_subtree_split_commit REV

should test only a single commit REV, but the combination of

    git log -1 --grep=...

actually searches all *parent* commits until a `--grep` match is
discovered.

Rewrite this method to test only one REV at a time. Extract commit
information with a single `git` call as opposed to three. The
`test` conditions for rejecting a commit remain unchanged.

Unit tests now cover nested subtrees.

Signed-off-by: Colin Stagner <ask+git@howdoi.land>
Acked-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The "promisor-remote" capability mechanism has been updated to
allow the "partialCloneFilter" settings and the "token" value to be
communicated from the server side.

* cc/promisor-remote-capability:
  promisor-remote: use string_list_split() in mark_remotes_as_accepted()
  promisor-remote: allow a client to check fields
  promisor-remote: use string_list_split() in filter_promisor_remote()
  promisor-remote: refactor how we parse advertised fields
  promisor-remote: use string constants for 'name' and 'url' too
  promisor-remote: allow a server to advertise more fields
  promisor-remote: refactor to get rid of 'struct strvec'
Some among "git add -p" and friends ignored color.diff and/or
color.ui configuration variables, which is an old regression, which
has been corrected.

* jk/add-i-color:
  contrib/diff-highlight: mention interactive.diffFilter
  add-interactive: manually fall back color config to color.ui
  add-interactive: respect color.diff for diff coloring
  stash: pass --no-color to diff plumbing child processes
Code clean-up.

* rs/get-oid-with-flags-cleanup:
  use repo_get_oid_with_flags()
"git subtree" (in contrib/) did not work correctly when splitting
squashed subtrees, which has been improved.

* cs/subtree-squash-split-fix:
  contrib/subtree: fix split with squashed subtrees
Signed-off-by: Junio C Hamano <gitster@pobox.com>
@pull pull bot locked and limited conversation to collaborators Sep 24, 2025
@pull pull bot added the ⤵️ pull label Sep 24, 2025
@pull pull bot merged commit bb69721 into turkdevops:master Sep 24, 2025
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4 participants