Commit Graph

61816 Commits

Author SHA1 Message Date
Junio C Hamano
16a8055dae Merge branch 'ma/doc-pack-format-varint-for-sizes'
Doc update.

* ma/doc-pack-format-varint-for-sizes:
  pack-format.txt: document sizes at start of delta data
2021-01-15 15:20:29 -08:00
Junio C Hamano
a11571bb7f Merge branch 'ma/t1300-cleanup'
Code clean-up.

* ma/t1300-cleanup:
  t1300: don't needlessly work with `core.foo` configs
  t1300: remove duplicate test for `--file no-such-file`
  t1300: remove duplicate test for `--file ../foo`
2021-01-15 15:20:28 -08:00
Junio C Hamano
40876260ef Merge branch 'pb/doc-modules-git-work-tree-typofix'
Doc fix.

* pb/doc-modules-git-work-tree-typofix:
  gitmodules.txt: fix 'GIT_WORK_TREE' variable name
2021-01-15 15:20:28 -08:00
Junio C Hamano
b17eb5b4e4 Merge branch 'ta/doc-typofix'
Doc fix.

* ta/doc-typofix:
  doc: fix some typos
2021-01-15 15:20:28 -08:00
Junio C Hamano
9ba366f12b Merge branch 'bc/rev-parse-path-format'
"git rev-parse" can be explicitly told to give output as absolute
or relative path with the `--path-format=(absolute|relative)` option.

* bc/rev-parse-path-format:
  rev-parse: add option for absolute or relative path formatting
  abspath: add a function to resolve paths with missing components
2021-01-15 15:20:28 -08:00
Junio C Hamano
6dbbae17d9 Merge branch 'ew/decline-core-abbrev'
The configuration variable 'core.abbrev' can be set to 'no' to
force no abbreviation regardless of the hash algorithm.

* ew/decline-core-abbrev:
  core.abbrev=no disables abbreviations
2021-01-15 15:20:28 -08:00
Patrick Steinhardt
d8d77153ea config: allow specifying config entries via envvar pairs
While we currently have the `GIT_CONFIG_PARAMETERS` environment variable
which can be used to pass runtime configuration data to git processes,
it's an internal implementation detail and not supposed to be used by
end users.

Next to being for internal use only, this way of passing config entries
has a major downside: the config keys need to be parsed as they contain
both key and value in a single variable. As such, it is left to the user
to escape any potentially harmful characters in the value, which is
quite hard to do if values are controlled by a third party.

This commit thus adds a new way of adding config entries via the
environment which gets rid of this shortcoming. If the user passes the
`GIT_CONFIG_COUNT=$n` environment variable, Git will parse environment
variable pairs `GIT_CONFIG_KEY_$i` and `GIT_CONFIG_VALUE_$i` for each
`i` in `[0,n)`.

While the same can be achieved with `git -c <name>=<value>`, one may
wish to not do so for potentially sensitive information. E.g. if one
wants to set `http.extraHeader` to contain an authentication token,
doing so via `-c` would trivially leak those credentials via e.g. ps(1),
which typically also shows command arguments.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-15 13:03:45 -08:00
Patrick Steinhardt
b9d147fb15 environment: make getenv_safe() a public function
The `getenv_safe()` helper function helps to safely retrieve multiple
environment values without the need to depend on platform-specific
behaviour for the return value's lifetime. We'll make use of this
function in a following patch, so let's make it available by making it
non-static and adding a declaration.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-15 13:03:45 -08:00
Patrick Steinhardt
1ff21c05ba config: store "git -c" variables using more robust format
The previous commit added a new format for $GIT_CONFIG_PARAMETERS which
is able to robustly handle subsections with "=" in them. Let's start
writing the new format. Unfortunately, this does much less than you'd
hope, because "git -c" itself has the same ambiguity problem! But it's
still worth doing:

  - we've now pushed the problem from the inter-process communication
    into the "-c" command-line parser. This would free us up to later
    add an unambiguous format there (e.g., separate arguments like "git
    --config key value", etc).

  - for --config-env, the parser already disallows "=" in the
    environment variable name. So:

      git --config-env section.with=equals.key=ENVVAR

    will robustly set section.with=equals.key to the contents of
    $ENVVAR.

The new test shows the improvement for --config-env.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-15 13:03:18 -08:00
Jeff King
f9dbb64fad config: parse more robust format in GIT_CONFIG_PARAMETERS
When we stuff config options into GIT_CONFIG_PARAMETERS, we shell-quote
each one as a single unit, like:

  'section.one=value1' 'section.two=value2'

On the reading side, we de-quote to get the individual strings, and then
parse them by splitting on the first "=" we find. This format is
ambiguous, because an "=" may appear in a subsection. So the config
represented in a file by both:

  [section "subsection=with=equals"]
  key = value

and:

  [section]
  subsection = with=equals.key=value

ends up in this flattened format like:

  'section.subsection=with=equals.key=value'

and we can't tell which was desired. We have traditionally resolved this
by taking the first "=" we see starting from the left, meaning that we
allowed arbitrary content in the value, but not in the subsection.

Let's make our environment format a bit more robust by separately
quoting the key and value. That turns those examples into:

  'section.subsection=with=equals.key'='value'

and:

  'section.subsection'='with=equals.key=value'

respectively, and we can tell the difference between them. We can detect
which format is in use for any given element of the list based on the
presence of the unquoted "=". That means we can continue to allow the
old format to work to support any callers which manually used the old
format, and we can even intermingle the two formats. The old format
wasn't documented, and nobody was supposed to be using it. But it's
likely that such callers exist in the wild, so it's nice if we can avoid
breaking them. Likewise, it may be possible to trigger an older version
of "git -c" that runs a script that calls into a newer version of "git
-c"; that new version would see the intermingled format.

This does create one complication, which is that the obvious format in
the new scheme for

  [section]
  some-bool

is:

  'section.some-bool'

with no equals. We'd mistake that for an old-style variable. And it even
has the same meaning in the old style, but:

  [section "with=equals"]
  some-bool

does not. It would be:

  'section.with=equals=some-bool'

which we'd take to mean:

  [section]
  with = equals=some-bool

in the old, ambiguous style. Likewise, we can't use:

  'section.some-bool'=''

because that's ambiguous with an actual empty string. Instead, we'll
again use the shell-quoting to give us a hint, and use:

  'section.some-bool'=

to show that we have no value.

Note that this commit just expands the reading side. We'll start writing
the new format via "git -c" in a future patch. In the meantime, the
existing "git -c" tests will make sure we didn't break reading the old
format. But we'll also add some explicit coverage of the two formats to
make sure we continue to handle the old one after we move the writing
side over.

And one final note: since we're now using the shell-quoting as a
semantically meaningful hint, this closes the door to us ever allowing
arbitrary shell quoting, like:

  'a'shell'would'be'ok'with'this'.key=value

But we have never supported that (only what sq_quote() would produce),
and we are probably better off keeping things simple, robust, and
backwards-compatible, than trying to make it easier for humans. We'll
continue not to advertise the format of the variable to users, and
instead keep "git -c" as the recommended mechanism for setting config
(even if we are trying to be kind not to break users who may be relying
on the current undocumented format).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-15 13:03:18 -08:00
Junio C Hamano
2d02bc91c0 t4203: make blame output massaging more robust
In the "git blame --porcelain" output, lines that ends with three
integers may not be the line that shows a commit object with line
numbers and block length (the contents from the blamed file or the
summary field can have a line that happens to match).  Also, the
names of the author may have more than three SP separated tokens
("git blame -L242,+1 cf6de18aab Documentation/SubmittingPatches"
gives an example).  The existing "grep -E | cut" pipeline is a bit
too loose on these two points.

While they can be assumed on the test data, it is not so hard to
use the right pattern from the documented format, so let's do so.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-14 21:54:52 -08:00
Philippe Blain
97f4b4c4e7 mailmap doc: use correct environment variable 'GIT_WORK_TREE'
gitmailmap(5) uses 'GIT_WORK_DIR' to refer to the root of the
repository, but this environment variable does not exist.

Use the correct spelling for that variable, 'GIT_WORK_TREE'.

Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-14 21:54:06 -08:00
Junio C Hamano
3831132ace ci/install-depends: attempt to fix "brew cask" stuff
We run "git pull" against "$cask_repo"; clarify that we are
expecting not to have any of our own modifications and running "git
pull" to merely update, by passing "--ff-only" on the command line.

Also, the "brew cask install" command line triggers an error message
that says:

    Error: Calling brew cask install is disabled! Use brew install
    [--cask] instead.

In addition, "brew install caskroom/cask/perforce" step triggers an
error that says:

    Error: caskroom/cask was moved. Tap homebrew/cask instead.

Attempt to see if blindly following the suggestion in these error
messages gets us into a better shape.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-14 19:08:56 -08:00
Jeff King
779412b9d9 for_each_object_in_pack(): clarify pack vs index ordering
We may return objects in one of two orders: how they appear in the .idx
(sorted by object id) or how they appear in the packfile itself. To
further complicate matters, we have two ordering variables, "i" and
"pos", and it is not clear to which order they apply.

Let's clarify this by using an unambiguous name where possible, and
leaving a comment for the variable that does double-duty.

Signed-off-by: Jeff King <peff@peff.net>
Acked-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-14 18:22:27 -08:00
Denton Liu
afa80f534b t4203: stop losing return codes of git commands
In a pipe, only the return code of the last command is used. Thus, all
other commands will have their return codes masked. Rewrite pipes so
that there are no git commands upstream so that their failure is
reported.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Acked-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-14 18:21:21 -08:00
Denton Liu
f9f30a0310 test-lib-functions.sh: fix usage for test_commit()
The usage comment for test_commit() shows that the --author option
should be given as `--author=<author>`. However, this is incorrect as it
only works when given as `--author <author>`. Correct this erroneous
text.

Also, for the sake of correctness, fix the description as well since we
invoke `git commit` with `--author <author>`, not `--author=<author>`.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Acked-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-14 18:21:03 -08:00
Christian Couder
7c99bc23fc pack-write: die on error in write_promisor_file()
write_promisor_file() already uses xfopen(), so it would die
if the file cannot be opened for writing. To be consistent
with this behavior and not overlook issues, let's also die if
there are errors when we are actually writing to the file.

Suggested-by: Jeff King <peff@peff.net>
Suggested-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-14 17:02:22 -08:00
Taylor Blau
e5dcd78418 pack-revindex.c: avoid direct revindex access in 'offset_to_pack_pos()'
To prepare for on-disk reverse indexes, remove a spot in
'offset_to_pack_pos()' that looks at the 'revindex' array in 'struct
packed_git'.

Even though this use of the revindex pointer is within pack-revindex.c,
this clean up is still worth doing. Since the 'revindex' pointer will be
NULL when reading from an on-disk reverse index (instead the
'revindex_data' pointer will be mmaped to the 'pack-*.rev' file), this
call-site would have to include a conditional to lookup the offset for
position 'mi' each iteration through the search.

So instead of open-coding 'pack_pos_to_offset()', call it directly from
within 'offset_to_pack_pos()'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:48 -08:00
Taylor Blau
d5bc7c60c7 pack-revindex: hide the definition of 'revindex_entry'
Now that all spots outside of pack-revindex.c that reference 'struct
revindex_entry' directly have been removed, it is safe to hide the
implementation by moving it from pack-revindex.h to pack-revindex.c.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:48 -08:00
Taylor Blau
8389855a9b pack-revindex: remove unused 'find_revindex_position()'
Now that all 'find_revindex_position()' callers have been removed (and
converted to the more descriptive 'offset_to_pack_pos()'), it is almost
safe to get rid of 'find_revindex_position()' entirely. Almost, except
for the fact that 'offset_to_pack_pos()' calls
'find_revindex_position()'.

Inline 'find_revindex_position()' into 'offset_to_pack_pos()', and
then remove 'find_revindex_position()' entirely.

This is a straightforward refactoring with one minor snag.
'offset_to_pack_pos()' used to load the index before calling
'find_revindex_position()'. That means that by the time
'find_revindex_position()' starts executing, 'p->num_objects' can be
safely read. After inlining, be careful to not read 'p->num_objects'
until _after_ 'load_pack_revindex()' (which loads the index as a
side-effect) has been called.

Another small fix that is included is converting the upper- and
lower-bounds to be unsigned's instead of ints. This dates back to
92e5c77c37 (revindex: export new APIs, 2013-10-24)--ironically, the last
time we introduced new APIs here--but this unifies the types.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:48 -08:00
Taylor Blau
1c3855f33b pack-revindex: remove unused 'find_pack_revindex()'
Now that no callers of 'find_pack_revindex()' remain, remove the
function's declaration and implementation entirely.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:47 -08:00
Taylor Blau
2891b434ac builtin/gc.c: guess the size of the revindex
'estimate_repack_memory()' takes into account the amount of memory
required to load the reverse index in memory by multiplying the assumed
number of objects by the size of the 'revindex_entry' struct.

Prepare for hiding the definition of 'struct revindex_entry' by removing
a 'sizeof()' of that type from outside of pack-revindex.c. Instead,
guess that one off_t and one uint32_t are required per object. Strictly
speaking, this is a worse guess than asking for 'sizeof(struct
revindex_entry)' directly, since the true size of this struct is 16
bytes with padding on the end of the struct in order to align the offset
field.

But, this is an approximation anyway, and it does remove a use of the
'struct revindex_entry' from outside of pack-revindex internals.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:47 -08:00
Taylor Blau
b130aef65e for_each_object_in_pack(): convert to new revindex API
Avoid looking at the 'revindex' pointer directly and instead call
'pack_pos_to_index()'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:47 -08:00
Taylor Blau
0a7e3642bc unpack_entry(): convert to new revindex API
Remove direct manipulation of the 'struct revindex_entry' type as well
as calls to the deprecated API in 'packfile.c:unpack_entry()'. Usual
clean-up is performed (replacing '->nr' with calls to
'pack_pos_to_index()' and so on).

Add an additional check to make sure that 'obj_offset()' points at a
valid object. In the case this check is violated, we cannot call
'mark_bad_packed_object()' because we don't know the OID. At the top of
the call stack is do_oid_object_info_extended() (via
packed_object_info()), which does mark the object.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:47 -08:00
Taylor Blau
fc150caf67 packed_object_info(): convert to new revindex API
Convert another call of 'find_pack_revindex()' to its replacement
'pack_pos_to_offset()'. Likewise:

  - Avoid manipulating `struct packed_git`'s `revindex` pointer directly
    by removing the pointer-as-array indexing.

  - Add an additional guard to check that the offset 'obj_offset()'
    points to a real object. This should be the case with well-behaved
    callers to 'packed_object_info()', but isn't guarenteed.

    Other blocks that fill in various other values from the 'struct
    object_info' request handle bad inputs by setting the type to
    'OBJ_BAD' and jumping to 'out'. Do the same when given a bad offset
    here.

    The previous code would have segfaulted when given a bad
    'obj_offset' value, since 'find_pack_revindex()' would return
    'NULL', and then the line that fills 'oi->disk_sizep' would try to
    access 'NULL[1]' with a stride of 16 bytes (the width of 'struct
    revindex_entry)'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:47 -08:00
Taylor Blau
3a3f54dd0a retry_bad_packed_offset(): convert to new revindex API
Perform exactly the same conversion as in the previous commit to another
caller within 'packfile.c'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:47 -08:00
Taylor Blau
45bef5c064 get_delta_base_oid(): convert to new revindex API
Replace direct accesses to the 'struct revindex' type with a call to
'pack_pos_to_index()'.

Likewise drop the old-style 'find_pack_revindex()' with its replacement
'offset_to_pack_pos()' (while continuing to perform the same error
checking).

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:46 -08:00
Taylor Blau
78232bf65d rebuild_existing_bitmaps(): convert to new revindex API
Remove another instance of looking at the revindex directly by instead
calling 'pack_pos_to_index()'. Unlike other patches, this caller only
cares about the index position of each object in the loop.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:46 -08:00
Taylor Blau
011f3fd5cd try_partial_reuse(): convert to new revindex API
Remove another instance of direct revindex manipulation by calling
'pack_pos_to_offset()' instead (the caller here does not care about the
index position of the object at position 'pos').

Note that we cannot just use the existing "offset" variable to store the
value we get from pack_pos_to_offset(). It is incremented by
unpack_object_header(), but we later need the original value. Since
we'll no longer have revindex->offset to read it from, we'll store that
in a separate variable ("header" since it points to the entry's header
bytes).

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:46 -08:00
Taylor Blau
a78a90324d get_size_by_pos(): convert to new revindex API
Remove another caller that holds onto a 'struct revindex_entry' by
replacing the direct indexing with calls to 'pack_pos_to_offset()' and
'pack_pos_to_index()'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:46 -08:00
Taylor Blau
cf98f2e8e0 show_objects_for_type(): convert to new revindex API
Avoid storing the revindex entry directly, since this structure will
soon be removed from the public interface. Instead, store the offset and
index position by calling 'pack_pos_to_offset()' and
'pack_pos_to_index()', respectively.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:46 -08:00
Taylor Blau
57665086af bitmap_position_packfile(): convert to new revindex API
Replace find_revindex_position() with its counterpart in the new API,
offset_to_pack_pos().

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:45 -08:00
Taylor Blau
eb3fd99efd check_object(): convert to new revindex API
Replace direct accesses to the revindex with calls to
'offset_to_pack_pos()' and 'pack_pos_to_index()'.

Since this caller already had some error checking (it can jump to the
'give_up' label if it encounters an error), we can easily check whether
or not the provided offset points to an object in the given pack. This
error checking existed prior to this patch, too, since the caller checks
whether the return value from 'find_pack_revindex()' was NULL or not.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:45 -08:00
Taylor Blau
6a5c10c45f write_reused_pack_verbatim(): convert to new revindex API
Replace a direct access to the revindex array with
'pack_pos_to_offset()'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:45 -08:00
Taylor Blau
66cbd3e2fb write_reused_pack_one(): convert to new revindex API
Replace direct revindex accesses with calls to 'pack_pos_to_offset()'
and 'pack_pos_to_index()'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:45 -08:00
Taylor Blau
952fc6870d write_reuse_object(): convert to new revindex API
First replace 'find_pack_revindex()' with its replacement
'offset_to_pack_pos()'. This prevents any bogus OFS_DELTA that may make
its way through until 'write_reuse_object()' from causing a bad memory
read (if 'revidx' is 'NULL')

Next, replace a direct access of '->nr' with the wrapper function
'pack_pos_to_index()'.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:45 -08:00
Taylor Blau
f33fb6e419 pack-revindex: introduce a new API
In the next several patches, we will prepare for loading a reverse index
either in memory (mapping the inverse of the .idx's contents in-core),
or directly from a yet-to-be-introduced on-disk format. To prepare for
that, we'll introduce an API that avoids the caller explicitly indexing
the revindex pointer in the packed_git structure.

There are four ways to interact with the reverse index. Accordingly,
four functions will be exported from 'pack-revindex.h' by the time that
the existing API is removed. A caller may:

 1. Load the pack's reverse index. This involves opening up the index,
    generating an array, and then sorting it. Since opening the index
    can fail, this function ('load_pack_revindex()') returns an int.
    Accordingly, it takes only a single argument: the 'struct
    packed_git' the caller wants to build a reverse index for.

    This function is well-suited for both the current and new API.
    Callers will have to continue to open the reverse index explicitly,
    but this function will eventually learn how to detect and load a
    reverse index from the on-disk format, if one exists. Otherwise, it
    will fallback to generating one in memory from scratch.

 2. Convert a pack position into an offset. This operation is now
    called `pack_pos_to_offset()`. It takes a pack and a position, and
    returns the corresponding off_t.

    Any error simply calls BUG(), since the callers are not well-suited
    to handle a failure and keep going.

 3. Convert a pack position into an index position. Same as above; this
    takes a pack and a position, and returns a uint32_t. This operation
    is known as `pack_pos_to_index()`. The same thinking about error
    conditions applies here as well.

 4. Find the pack position for a given offset. This operation is now
    known as `offset_to_pack_pos()`. It takes a pack, an offset, and a
    pointer to a uint32_t where the position is written, if an object
    exists at that offset. Otherwise, -1 is returned to indicate
    failure.

    Unlike some of the callers that used to access '->offset' and '->nr'
    directly, the error checking around this call is somewhat more
    robust. This is important since callers should always pass an offset
    which points at the boundary of two objects. The API, unlike direct
    access, enforces that that is the case.

    This will become important in a subsequent patch where a caller
    which does not but could check the return value treats the signed
    `-1` from `find_revindex_position()` as an index into the 'revindex'
    array.

Two design warts are carried over into the new API:

  - Asking for the index position of an out-of-bounds object will result
    in a BUG() (since no such object exists), but asking for the offset
    of the non-existent object at the end of the pack returns the total
    size of the pack.

    This makes it convenient for callers who always want to take the
    difference of two adjacent object's offsets (to compute the on-disk
    size) but don't want to worry about boundaries at the end of the
    pack.

  - offset_to_pack_pos() lazily loads the reverse index, but
    pack_pos_to_index() doesn't (callers of the former are well-suited
    to handle errors, but callers of the latter are not).

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 21:53:44 -08:00
Ævar Arnfjörð Bjarmason
0d28d3cf33 CoC: update to version 2.0 + local changes
Update the CoC added in 5cdf2301 (add a Code of Conduct document,
2019-09-24 from version 1.4 to version 2.0. This is the version found
at [1] with the following minor changes:

 - We preserve the change to the CoC in 3f9ef874a7 (CODE_OF_CONDUCT:
   mention individual project-leader emails, 2019-09-26)

 - We preserve the custom intro added in 5cdf2301d4 (add a Code of
   Conduct document, 2019-09-24)

This change intentionally preserves a warning emitted on "git diff
--check". It's better to make it easily diff-able with upstream than
to fix whitespace changes in our version while we're at it.

1. https://www.contributor-covenant.org/version/2/0/code_of_conduct/code_of_conduct.md

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Acked-by: Christian Couder <chriscool@tuxfamily.org>
Acked-by: Derrick Stolee <dstolee@microsoft.com>
Acked-by: Elijah Newren <newren@gmail.com>
Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Acked-by: Jonathan Nieder <jrnieder@gmail.com>
Acked-by: brian m. carlson <sandals@crustytoothpaste.net>
Acked-by: Jeff King <peff@peff.net>
Acked-by: Taylor Blau <me@ttaylor.com>
Acked-by: Jonathan Tan <jonathantanmy@google.com>
Acked-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-13 17:45:04 -08:00
Christian Couder
33add2ad7d fetch-pack: refactor writing promisor file
Let's replace the 2 different pieces of code that write a
promisor file in 'builtin/repack.c' and 'fetch-pack.c'
with a new function called 'write_promisor_file()' in
'pack-write.c' and 'pack.h'.

This might also help us in the future, if we want to put
back the ref names and associated hashes that were in
the promisor files we are repacking in 'builtin/repack.c'
as suggested by a NEEDSWORK comment just above the code
we are refactoring.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 16:01:07 -08:00
Christian Couder
9d7fa3be31 fetch-pack: rename helper to create_promisor_file()
As we are going to refactor the code that actually writes
the promisor file into a separate function in a following
commit, let's rename the current write_promisor_file()
function to create_promisor_file().

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 16:01:07 -08:00
Ævar Arnfjörð Bjarmason
4e168333a8 shortlog: remove unused(?) "repo-abbrev" feature
Remove support for the magical "repo-abbrev" comment in .mailmap
files. This was added to .mailmap parsing in [1], as a generalized
feature of the git-shortlog Perl script added earlier in [2].

There was no documentation or tests for this feature, and I don't
think it's used in practice anymore.

What it did was to allow you to specify a single string to be
search-replaced with "/.../" in the .mailmap file. E.g. for
linux.git's current .mailmap:

    git archive --remote=git@gitlab.com:linux-kernel/linux.git \
        HEAD -- .mailmap | grep -a repo-abbrev
    # repo-abbrev: /pub/scm/linux/kernel/git/

Then when running e.g.:

    git shortlog --merges --author=Linus -1 v5.10-rc7..v5.10 | grep Merge

We'd emit (the [...] is mine):

      Merge tag [...]git://git.kernel.org/.../tip/tip

But will now emit:

      Merge tag [...]git.kernel.org/pub/scm/linux/kernel/git/tip/tip

I think at this point this is just a historical artifact we can get
rid of. It was initially meant for Linus's own use when we integrated
the Perl script[2], but since then it seems he's stopped using it.

Digging through Linus's release announcements on the LKML[3] the last
release I can find that made use of this output is Linux 2.6.25-rc6
back in March 2008[4]. Later on Linus started using --no-merges[5],
and nowadays seems to prefer some custom not-quite-shortlog format of
merges from lieutenants[6].

You will still see it on linux.git if you run "git shortlog" manually
yourself with --merges, with this removed you can still get the same
output with:

    git log --pretty=fuller v5.10-rc7..v5.10 |
    sed 's!/pub/scm/linux/kernel/git/!/.../!g' |
    git shortlog

Arguably we should do the same for the search-replacing of "[PATCH]"
at the beginning with "". That seems to be another relic of a bygone
era when linux.git patches would have their E-Mail subject lines
applied as-is by "git am" or whatever. But we documented that feature
in "git-shortlog(1)", and it seems more widely applicable than
something purely kernel-specific.

1. 7595e2ee6e (git-shortlog: make common repository prefix
   configurable with .mailmap, 2006-11-25)
2. fa375c7f1b (Add git-shortlog perl script, 2005-06-04)
3. https://lore.kernel.org/lkml/
4. https://lore.kernel.org/lkml/alpine.LFD.1.00.0803161651350.3020@woody.linux-foundation.org/
5. https://lore.kernel.org/lkml/BANLkTinrbh7Xi27an3uY7pDWrNKhJRYmEA@mail.gmail.com/
6. https://lore.kernel.org/lkml/CAHk-=wg1+kf1AVzXA-RQX0zjM6t9J2Kay9xyuNqcFHWV-y5ZYw@mail.gmail.com/

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:42 -08:00
Ævar Arnfjörð Bjarmason
238803cb40 mailmap doc + tests: document and test for case-insensitivity
Add documentation and more tests for case-insensitivity. The existing
test only matched on the E-Mail part, but as shown here we also match
the name with strcasecmp().

This behavior was last discussed on the mailing list in the thread
starting at [1]. It seems we're keeping it like this, so let's
document it.

1. https://lore.kernel.org/git/87czykvg19.fsf@evledraar.gmail.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:42 -08:00
Ævar Arnfjörð Bjarmason
34986b773a mailmap tests: add tests for empty "<>" syntax
Add tests for mailmap's handling of "<>", which is allowed on the RHS,
but not the LHS of a "<LHS> <RHS>" pair.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:42 -08:00
Ævar Arnfjörð Bjarmason
9e2a14a889 mailmap tests: add tests for whitespace syntax
Add tests for mailmap's handling of whitespace, i.e. how it trims
space within "<>" and around author names.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:42 -08:00
Ævar Arnfjörð Bjarmason
9b391b09a0 mailmap tests: add a test for comment syntax
Add a test for mailmap comment syntax. As noted in [1] there was no
test coverage for this. Let's make sure a future change doesn't break
it.

1. https://lore.kernel.org/git/CAN0heSoKYWXqskCR=GPreSHc6twCSo1345WTmiPdrR57XSShhA@mail.gmail.com/

Reported-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:42 -08:00
Ævar Arnfjörð Bjarmason
05b5ff219c mailmap doc + tests: add better examples & test them
Change the mailmap documentation added in 0925ce4d49 (Add map_user()
and clear_mailmap() to mailmap, 2009-02-08) to continue discussing the
Jane/Joe example. I think this makes things a lot less confusing as
we're building up more complex examples using one set of data which
covers all the things we'd like to discuss.

Also add tests to assert that what our documentation says is what's
actually happening. This is mostly (or entirely) covered by existing
tests which I'm not deleting, but having these tests for the synopsis
makes it easier to follow-along while reading the tests & docs.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:42 -08:00
Ævar Arnfjörð Bjarmason
f5d79bf7dd tests: refactor a few tests to use "test_commit --append"
Refactor a few more tests to use the new "--append" option to
"test_commit". I added it for use in the mailmap tests, but this
demonstrates how useful it is in general.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:41 -08:00
Ævar Arnfjörð Bjarmason
3373518cc8 test-lib functions: add an --append option to test_commit
Add an --append option to test_commit to append <contents> to the
<file> we're writing to. This simplifies a lot of test setup, as shown
in some of the tests being changed here.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:41 -08:00
Ævar Arnfjörð Bjarmason
999cfc4f45 test-lib functions: add --author support to test_commit
Add support for --author to "test_commit". This will simplify some
current and future tests, one of those is being changed here.

Let's also line-wrap the "git commit" command invocation to make diffs
that add subsequent options easier to add, as they'll only need to add
a new option line.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:41 -08:00
Ævar Arnfjörð Bjarmason
76b8b8d05c test-lib functions: document arguments to test_commit
The --notick argument was added in [1] and was followed by --signoff
in [2], but neither of these commits added any documentation for these
options. When -C was added in [3] a comment was added to document it,
but not the other options. Let's document all of these options.

1. 44b85e89d7 (t7003: add test to filter a branch with a commit at
   epoch, 2012-07-12),
2. 5ed75e2a3f (cherry-pick: don't forget -s on failure, 2012-09-14).
3. 6f94351b0a (test-lib-functions.sh: teach test_commit -C <dir>,
   2016-12-08)

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-01-12 14:04:41 -08:00