Use gettimeofday instead of time(NULL) to get current time.
This avoids clock skew on glibc 2.31+ on Linux, where in the
first 1 to 2.5 ms of every second, time(NULL) returns a
value that is one less than the tv_sec part of
higher-resolution timestamps such as those returned by
gettimeofday or timespec_get, or those in the file system.
There are similar clock skew problems on AIX and MS-Windows,
which have problems in the first 5 ms of every second.
Without this patch, users can observe Git issuing a
timestamp T+1 before it issues timestamp T, because Git
sometimes uses time(NULL) or time(&t) and sometimes uses
higher-res methods like gettimeofday. Although strictly
speaking users should tolerate this behavior because a
superuser can always change the clock back, this is a
quality of implementation issue and users naturally expect
Git to issue timestamps in increasing order unless the
superuser has fiddled with the system clock.
This patch always uses gettimeofday(...) instead of time(...),
and I have verified that the resulting .o files never refer
to the name 'time'. A trickier patch would change only
those calls for which timestamp monotonicity is user-visible.
Such a patch would require more expertise about Git internals,
though, and would be harder to maintain later.
Another possibility would be to change Git's documentation
to warn users that Git does not always issue timestamps in
increasing order. However, Git users would likely be either
dismayed by this possibility, or confused by the level of
detail that any such documentation would require.
Yet another possibility would be to fix the Linux kernel so
that the time syscall is consistent with the other timestamp
syscalls. I suppose this has not been done due to
performance implications. (Git's use of timestamps is rare
enough that performance is not a significant consideration
for git.) However, this wouldn't fix Git's problem on older
Linux kernels, or on AIX or MS-Windows.
Signed-off-by: Paul Eggert <eggert@cs.ucla.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Use designated initializers in the expansions of the OPT_* macros to
make it more readable which one-letter macro parameter initializes
which field in the resulting 'struct option'.
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Rename the 'help' parameter as it matches one of the fields in 'struct
option', and, while at it, rename all other parameters to the usual
one-letter name used in similar macro definitions.
Furthermore, put all parameters in the replacement list between
parentheses, like all other OPT_* macros do.
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
In the various OPT_* macros the 'f' parameter is usually used to
specify flags, while the 'cb' parameter is used to specify a callback
function. OPT_CALLBACK and OPT_NUMBER_CALLBACKS, however, are
inconsistent with the rest, as they use 'f' to specify their callback
function.
Rename their callback macro parameters to 'cb' to avoid the
inconsistency.
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The headers 'diagnose.h', 'list-objects-filter-options.h',
'ref-filter.h' and 'remote.h' declare option parsing callback
functions with a 'struct option*' parameter, and 'revision.h' declares
an option parsing helper function taking 'struct parse_opt_ctx_t*' and
'struct option*' parameters. These headers all include
'parse-options.h', although they don't need any of the type
definitions from that header file. Furthermore,
'list-objects-filter-options.h' and 'ref-filter.h' also define some
OPT_* macros to initialize a 'struct option', but these don't
necessitate the inclusion of parse-options.h in these headers either,
because these macros are only expanded in source files.
Remove these unnecessary inclusions of parse-options.h and use forward
declarations to declare the necessary types.
After this patch none of the header files include parse-options.h
anymore.
With these changes, the build time after modifying only
parse-options.h is reduced by about 30%, and the number of targets
built is almost 20% less:
Before:
$ touch parse-options.h && time make -j4 |wc -l
353
real 1m1.527s
user 3m32.205s
sys 0m15.903s
After:
289
real 0m39.285s
user 2m12.540s
sys 0m11.164s
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The builtins 'ls-remote', 'pack-objects', 'receive-pack', 'reflog' and
'send-pack' use parse_options(), but their source files don't directly
include 'parse-options.h'. Furthermore, the source files
'diagnose.c', 'list-objects-filter-options.c', 'remote.c' and
'send-pack.c' define option parsing callback functions, while
'revision.c' defines an option parsing helper function, and thus need
access to various fields in 'struct option' and 'struct
parse_opt_ctx_t', but they don't directly include 'parse-options.h'
either. They all can still be built, of course, because they include
one of the header files that does include 'parse-options.h' (though
unnecessarily, see the next commit).
Add those missing includes to these files, as our general rule is that
"a C file must directly include the header files that declare the
functions and the types it uses".
Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
WM_ABORT_ALL and WM_ABORT_TO_STARSTAR are used internally to limit
backtracking when a match fails, they are not of interest to the caller
and so should not be public.
Suggested-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The code changed in this commit is designed to check if the pattern
starts with "**/" or contains "/**/" (see 3a078dec33 (wildmatch: fix
"**" special case, 2013-01-01)). Unfortunately when the pattern begins
with "**/" `prev_p = p - 2` is evaluated when `p` points to the second
"*" and so the subtraction is undefined according to section 6.5.6 of
the C standard because the result does not point within the same object
as `p`. Fix this by avoiding the subtraction unless it is well defined.
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When dowild() cannot match a '*' or '/**/' wildcard then it must return
WM_ABORT_TO_STARSTAR or WM_ABORT_ALL respectively. Failure to observe
this results in unnecessary backtracking and the time taken for a failed
match increases exponentially with the number of wildcards in the
pattern [1]. Unfortunately in some instances dowild() returns WM_NOMATCH
for a failed match resulting in long match times for patterns containing
multiple wildcards as can be seen in the following benchmark.
(Note that the timings in the Benchmark 1 are really measuring the time
to execute test-tool rather than the time to match the pattern)
Benchmark 1: t/helper/test-tool wildmatch wildmatch aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab "*a"
Time (mean ± σ): 22.8 ms ± 1.7 ms [User: 12.1 ms, System: 10.6 ms]
Range (min … max): 19.4 ms … 26.9 ms 113 runs
Warning: Ignoring non-zero exit code.
Benchmark 2: t/helper/test-tool wildmatch wildmatch aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab "*a*a*a*a*a*a*a*a*a"
Time (mean ± σ): 5.244 s ± 0.228 s [User: 5.229 s, System: 0.010 s]
Range (min … max): 4.969 s … 5.707 s 10 runs
Warning: Ignoring non-zero exit code.
Summary
't/helper/test-tool wildmatch wildmatch aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab "*a"' ran
230.37 ± 20.04 times faster than 't/helper/test-tool wildmatch wildmatch aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab "*a*a*a*a*a*a*a*a*a"'
The security implications are limited as it only affects operations that
are potentially DoS vectors. For example by creating a blob containing
such a pattern a malicious user can exploit this behavior to use large
amounts of CPU time on a remote server by pushing the blob and then
creating a new clone with --filter=sparse:oid. However this filter type
is usually disabled as it is known to consume large amounts of CPU time
even without this bug.
The WM_MATCH changed in the first hunk of this patch comes from the
original implementation imported from rsync in 5230f605e1 (Import
wildmatch from rsync, 2012-10-15). Compared to the others converted here
it is fairly harmless as it only triggers at the end of the pattern and
so will only cause a single unnecessary backtrack. The others introduced
by 6f1a31f0aa (wildmatch: advance faster in <asterisk> + <literal>
patterns, 2013-01-01) and 46983441ae (wildmatch: make a special case for
"*/" with FNM_PATHNAME, 2013-01-01) are more pernicious and will cause
exponential behavior.
A new test is added to protect against future regressions.
[1] https://research.swtch.com/glob
Helped-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"git add -p" while the index is unmerged sometimes failed to parse
the diff output it internally produces and died, which has been
corrected.
* jk/add-p-unmerged-fix:
add-patch: handle "* Unmerged path" lines
After "git pull" that is configured with pull.rebase=false
merge.ff=only fails due to our end having our own development, give
advice messages to get out of the "Not possible to fast-forward"
state.
* fc/advice-diverged-history:
advice: add diverging advice for novices
The code to parse "git rebase -X<opt>" was not prepared to see an
unparsable option string, which has been corrected.
* ab/fix-strategy-opts-parsing:
sequencer.c: fix overflow & segfault in parse_strategy_opts()
Once we start running, we assumed that the list of alternate object
databases would never change. Hook into the machinery used to
update the list of packfiles during runtime to update this list as
well.
* ds/reprepare-alternates-when-repreparing-packfiles:
object-file: reprepare alternates when necessary
"git format-patch" learned to write a log-message only output file
for empty commits.
* jk/format-patch-change-format-for-empty-commits:
format-patch: output header for empty commits
"git bundle" learned that "-" is a common way to say that the input
comes from the standard input and/or the output goes to the
standard output. It used to work only for output and only from the
root level of the working tree.
* jk/bundle-use-dash-for-stdfiles:
parse-options: use prefix_filename_except_for_dash() helper
parse-options: consistently allocate memory in fix_filename()
bundle: don't blindly apply prefix_filename() to "-"
bundle: document handling of "-" as stdin
bundle: let "-" mean stdin for reading operations
A few subcommands have been taught to stop users from working on a
branch that is being used in another worktree linked to the same
repository.
* rj/avoid-switching-to-already-used-branch:
switch: reject if the branch is already checked out elsewhere (test)
rebase: refuse to switch to a branch already checked out elsewhere (test)
branch: fix die_if_checked_out() when ignore_current_worktree
worktree: introduce is_shared_symref()
Allow "git bisect reset" to check out the original branch when the
branch is already checked out in a different worktree linked to the
same repository.
* rj/bisect-already-used-branch:
bisect: fix "reset" when branch is checked out elsewhere
"git push" has been taught to allow deletion of refs with one-level
names to help repairing a repository who acquired such a ref by
mistake. In general, we don't encourage use of such a ref, and
creation or update to such a ref is rejected as before.
* zh/push-to-delete-onelevel-ref:
push: allow delete single-level ref
receive-pack: fix funny ref error messsage
"git restore" supports options like "--ours" that are only
meaningful during a conflicted merge, but these options are only
meaningful when updating the working tree files. These options are
marked to be incompatible when both "--staged" and "--worktree" are
in effect.
* ak/restore-both-incompatible-with-conflicts:
restore: fault --staged --worktree with merge opts
Fix a segfaulting loop. The function and its caller may need
further clean-up.
* ew/commit-reach-clean-up-flags-fix:
commit-reach: avoid NULL dereference
There's code in git_connect() that checks whether we are doing a push
with protocol_v2, and if so, drops us to protocol_v0 (since we know
how to do v2 only for fetches). But it misses some corner cases:
1. it checks the "prog" variable, which is actually the path to
receive-pack on the remote side. By default this is just
"git-receive-pack", but it could be an arbitrary string (like
"/path/to/git receive-pack", etc). We'd accidentally stay in v2
mode in this case.
2. besides "receive-pack" and "upload-pack", there's one other value
we'd expect: "upload-archive" for handling "git archive --remote".
Like receive-pack, this doesn't understand v2, and should use the
v0 protocol.
In practice, neither of these causes bugs in the real world so far. We
do send a "we understand v2" probe to the server, but since no server
implements v2 for anything but upload-pack, it's simply ignored. But
this would eventually become a problem if we do implement v2 for those
endpoints, as older clients would falsely claim to understand it,
leading to a server response they can't parse.
We can fix (1) by passing in both the program path and the "name" of the
operation. I treat the name as a string here, because that's the pattern
set in transport_connect(), which is one of our callers (we were simply
throwing away the "name" value there before).
We can fix (2) by allowing only known-v2 protocols ("upload-pack"),
rather than blocking unknown ones ("receive-pack" and "upload-archive").
That will mean whoever eventually implements v2 push will have to adjust
this list, but that's reasonable. We'll do the safe, conservative thing
(sticking to v0) by default, and anybody working on v2 will quickly
realize this spot needs to be updated.
The new tests cover the receive-pack and upload-archive cases above, and
re-confirm that we allow v2 with an arbitrary "--upload-pack" path (that
already worked before this patch, of course, but it would be an easy
thing to break if we flipped the allow/block logic without also handling
"name" separately).
Here are a few miscellaneous implementation notes, since I had to do a
little head-scratching to understand who calls what:
- transport_connect() is called only for git-upload-archive. For
non-http git remotes, that resolves to the virtual connect_git()
function (which then calls git_connect(); confused yet?). So
plumbing through "name" in connect_git() covers that.
- for regular fetches and pushes, callers use higher-level functions
like transport_fetch_refs(). For non-http git remotes, that means
calling git_connect() under the hood via connect_setup(). And that
uses the "for_push" flag to decide which name to use.
- likewise, plumbing like fetch-pack and send-pack may call
git_connect() directly; they each know which name to use.
- for remote helpers (including http), we already have separate
parameters for "name" and "exec" (another name for "prog"). In
process_connect_service(), we feed the "name" to the helper via
"connect" or "stateless-connect" directives.
There's also a "servpath" option, which can be used to tell the
helper about the "exec" path. But no helpers we implement support
it! For http it would be useless anyway (no reasonable server
implementation will allow you to send a shell command to run the
server). In theory it would be useful for more obscure helpers like
remote-ext, but even there it is not implemented.
It's tempting to get rid of it simply to reduce confusion, but we
have publicly documented it since it was added in fa8c097cc9
(Support remote helpers implementing smart transports, 2009-12-09),
so it's possible some helper in the wild is using it.
- So for v2, helpers (again, including http) are mainly used via
stateless-connect, driven by the main program. But they do still
need to decide whether to do a v2 probe. And so there's similar
logic in remote-curl.c's discover_refs() that looks for
"git-receive-pack". But it's not buggy in the same way. Since it
doesn't support servpath, it is always dealing with a "service"
string like "git-receive-pack". And since it doesn't support
straight "connect", it can't be used for "upload-archive".
So we could leave that spot alone. But I've updated it here to match
the logic we're changing in connect_git(). That seems like the least
confusing thing for somebody who has to touch both of these spots
later (say, to add v2 push support). I didn't add a new test to make
sure this doesn't break anything; we already have several tests (in
t5551 and elsewhere) that make sure we are using v2 over http.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
A new "fetch.hideRefs" option can be used to exclude specified refs
from "rev-list --objects --stdin --not --all" traversal for
checking object connectivity, most useful when there are many
unrelated histories in a single repository.
* ew/fetch-hiderefs:
fetch: support hideRefs to speed up connectivity checks
Allow information carried on the WWW-AUthenticate header to be
passed to the credential helpers.
* mc/credential-helper-www-authenticate:
credential: add WWW-Authenticate header to cred requests
http: read HTTP WWW-Authenticate response headers
t5563: add tests for basic and anoymous HTTP access
Instead of forcing each command to choose to honor GPG related
configuration variables, make the subsystem lazily initialize
itself.
* jc/gpg-lazy-init:
drop pure pass-through config callbacks
gpg-interface: lazily initialize and read the configuration
More work towards -Wunused.
* jk/unused-post-2.39-part2: (21 commits)
help: mark unused parameter in git_unknown_cmd_config()
run_processes_parallel: mark unused callback parameters
userformat_want_item(): mark unused parameter
for_each_commit_graft(): mark unused callback parameter
rewrite_parents(): mark unused callback parameter
fetch-pack: mark unused parameter in callback function
notes: mark unused callback parameters
prio-queue: mark unused parameters in comparison functions
for_each_object: mark unused callback parameters
list-objects: mark unused callback parameters
mark unused parameters in signal handlers
run-command: mark error routine parameters as unused
mark "pointless" data pointers in callbacks
ref-filter: mark unused callback parameters
http-backend: mark unused parameters in virtual functions
http-backend: mark argc/argv unused
object-name: mark unused parameters in disambiguate callbacks
serve: mark unused parameters in virtual functions
serve: use repository pointer to get config
ls-refs: drop config caching
...
Code clean-up to clarify the rule that "git-compat-util.h" must be
the first to be included.
* en/header-cleanup:
diff.h: remove unnecessary include of object.h
Remove unnecessary includes of builtin.h
treewide: replace cache.h with more direct headers, where possible
replace-object.h: move read_replace_refs declaration from cache.h to here
object-store.h: move struct object_info from cache.h
dir.h: refactor to no longer need to include cache.h
object.h: stop depending on cache.h; make cache.h depend on object.h
ident.h: move ident-related declarations out of cache.h
pretty.h: move has_non_ascii() declaration from commit.h
cache.h: remove dependence on hex.h; make other files include it explicitly
hex.h: move some hex-related declarations from cache.h
hash.h: move some oid-related declarations from cache.h
alloc.h: move ALLOC_GROW() functions from cache.h
treewide: remove unnecessary cache.h includes in source files
treewide: remove unnecessary cache.h includes
treewide: remove unnecessary git-compat-util.h includes in headers
treewide: ensure one of the appropriate headers is sourced first
Code clean-up to clarify directory traversal API.
* en/dir-api-cleanup:
unpack-trees: add usage notices around df_conflict_entry
unpack-trees: special case read-tree debugging as internal usage
unpack-trees: rewrap a few overlong lines from previous patch
unpack-trees: mark fields only used internally as internal
unpack_trees: start splitting internal fields from public API
sparse-checkout: avoid using internal API of unpack-trees, take 2
sparse-checkout: avoid using internal API of unpack-trees
unpack-trees: clean up some flow control
dir: mark output only fields of dir_struct as such
dir: add a usage note to exclude_per_dir
dir: separate public from internal portion of dir_struct
unpack-trees: heed requests to overwrite ignored files
t2021: fix platform-specific leftover cruft
"git fsck" learned to check the index files in other worktrees,
just like "git gc" honors them as anchoring points.
* jk/fsck-indices-in-worktrees:
fsck: check even zero-entry index files
fsck: mention file path for index errors
fsck: check index files in all worktrees
fsck: factor out index fsck
When the prompt command mode was introduced in 1bfc51ac81 (Allow
__git_ps1 to be used in PROMPT_COMMAND, 2012-10-10), the assumption was
that it was necessary in order to properly add colors to PS1 in bash,
but this wasn't true.
It's true that the \[ \] markers add the information needed to properly
calculate the width of the prompt, and they have to be added directly to
PS1, a function returning them doesn't work.
But that is because bash coverts the \[ \] markers in PS1 to \001 \002,
which is what readline ultimately needs in order to calculate the width.
We don't need bash to do this conversion, we can use \001 \002
ourselves, and then the prompt command mode is not necessary to display
colors.
This is what functions returning colors are supposed to do [1].
[1] http://mywiki.wooledge.org/BashFAQ/053
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Tested-by: Joakim Petersen <joak-pet@online.no>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Currently `git rev-parse --quiet @{u}` is not actually quiet when
upstream isn't configured:
fatal: no upstream configured for branch 'foo'
Make it so.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When git-rebase invokes format-patch, it wants to make sure we use the
normal prefixes, and are not confused by diff.noprefix or similar. When
this was added in 5b220a6876 (Add --src/dst-prefix to git-formt-patch
in git-rebase.sh, 2010-09-09), we only had --src-prefix and --dst-prefix
to do so, which requires re-specifying the prefixes we expect to see.
These days we can say what we want more directly: just use the defaults.
This is a minor cleanup that should have no behavior change, but
hopefully the result expresses more clearly what the code is trying to
accomplish.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Fix a bug introduced with the "--format" option in
ce74de93 (ls-files: introduce "--format" option, 2022-07-23),
where relative paths were computed using the output buffer,
which could lead to random garbage data in the output.
Signed-off-by: Adam Johnson <me@adamj.eu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When accepting a packfile in git-receive-pack(1), we feed that packfile
into git-index-pack(1) to generate the packfile index. As the packfile
would often only contain unreachable objects until the references have
been updated, concurrently running garbage collection might be tempted
to delete the packfile right away and thus cause corruption. To fix
this, we ask git-index-pack(1) to create a `.keep` file before moving
the packfile into place, which is getting deleted again once all of the
reference updates have been processed.
Now in production systems we have observed that those `.keep` files are
sometimes not getting deleted as expected, where the result is that
repositories tend to grow packfiles that are never deleted over time.
This seems to be caused by a race when git-receive-pack(1) is killed
after we have migrated the kept packfile from the quarantine directory
into the main object database. While this race window is typically small
it can be extended for example by installing a `proc-receive` hook.
Fix this race by registering the lockfile as a tempfile so that it will
automatically be removed at exit or when receiving a signal.
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When the list of files as input was implemented in 6508eedf67
(t/aggregate-results: accomodate systems with small max argument list
length, 2010-06-01), a much simpler solution wasn't considered.
Let's just pass the directory as an argument.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When an object is not found in a repository's object store, we sometimes
call reprepare_packed_git() to see if the object was temporarily moved
into a new pack-file (and its old pack-file or loose object was
deleted). This process does a scan of each pack directory within each
odb, but does not reevaluate if the odb list needs updating.
Extend reprepare_packed_git() to also reprepare the alternate odb list
by setting loaded_alternates to zero and calling prepare_alt_odb(). This
will add newly-discoverd odbs to the linked list, but will not duplicate
existing ones nor will it remove existing ones that are no longer listed
in the alternates file. Do this under the object read lock to avoid
readers from interacting with a potentially incomplete odb being added
to the odb list.
If the alternates file was edited to _remove_ some alternates during the
course of the Git process, Git will continue to see alternates that were
ever valid for that repository. ODBs are not removed from the list, the
same as the existing behavior before this change. Git already has
protections against an alternate directory disappearing from the
filesystem during the lifetime of a process, and those are still in
effect.
This change is specifically for concurrent changes to the repository, so
it is difficult to create a test that guarantees this behavior is
correct. I manually verified by introducing a reprepare_packed_git() call
into get_revision() and stepped into that call in a debugger with a
parent 'git log' process. Multiple runs of prepare_alt_odb() kept
the_repository->objects->odb as a single-item chain until I added a
.git/objects/info/alternates file in a different process. The next run
added the new odb to the chain and subsequent runs did not add to the
chain.
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
It seems a user would expect this option would work regardless
of whether it's fetching from a single remote, many remotes,
or recursing into submodules.
Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When we generate a diff with --cached, unmerged entries have no oid for
their index entry:
$ git diff-index --abbrev --cached HEAD
:100644 000000 f719efd 0000000 U my-conflict
So when we are asked to produce a patch, since we only have one side, we
just emit a special message:
$ git diff-index --cached -p HEAD
* Unmerged path my-conflict
This confuses interactive-patch modes that look at cached diffs. For
example:
$ git reset -p
BUG: add-patch.c:498: diff starts with unexpected line:
* Unmerged path my-conflict
Making things even more confusing, you'll get that error only if the
unmerged entry is alphabetically the first changed file. Otherwise, we
simply stick the unrecognized line to the end of the previous hunk.
There it's mostly harmless, as it eventually gets fed back to "git
apply", which happily ignores it. But it's still shown to the user
attached to the hunk, which is wrong.
So let's handle these lines as a noop. There's not really anything
useful to do with a conflicted merge in this case, and that's what we do
for other cases like "add -p". There we get a "diff --cc" line, which we
accept as starting a new file, but we refuse to use any of its hunks
(their headers start with "@@@" and not "@@ ", so we silently ignore
them).
It seems like simply recognizing the line and continuing in our parsing
loop would work. But we actually need to run the rest of the loop body
to handle matching up our colored/filtered output. But that code assumes
that we have some active file_diff we're working on. So instead, we'll
just insert a dummy entry into our array. This ends up the same as if we
saw a "diff --cc" line (a file with no hunks).
Reported-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The previous commit dropped support for diff.noprefix in format-patch.
While this will do the right thing in most cases (where sending patches
without a prefix was an accidental side effect of the sender preferring
to see their local patches without prefixes), it left no good option for
a project or workflow where you really do want to send patches without
prefixes. You'd be stuck using "--no-prefix" for every invocation.
So let's add a config option specific to format-patch that enables this
behavior. That gives people who have such a workflow a way to get what
they want, but makes it hard to accidentally trigger it.
A more backwards-compatible way of doing the transition would be to have
format.noprefix default to diff.noprefix when it's not set. But that
doesn't really help the "accidental" problem; people would have to
manually set format.noprefix=false. And it's unlikely that anybody
really wants format.noprefix=true in the first place. I'm adding it here
mostly as an escape hatch, not because anybody has expressed any
interest in it.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The output of format-patch respects diff.noprefix, but this usually ends
up being a hassle for people receiving the patch, as they have to
manually specify "-p0" in order to apply it.
I don't think there was any specific intention for it to behave this
way. The noprefix option is handled by git_diff_ui_config(), and
format-patch exists in a gray area between plumbing and porcelain.
People do look at the output, and we'd expect it to colorize things,
respect their choice of algorithm, and so on. But this particular option
creates problems for the receiver (in theory so does diff.mnemonicprefix,
but since we are always formatting commits, the mnemonic prefixes will
always be "a/" and "b/").
So let's disable it. The slight downsides are:
- people who have set diff.noprefix presumably like to see their
patches without prefixes. If they use format-patch to review their
series, they'll see prefixes. On the other hand, it is probably a
good idea for them to look at what will actually get sent out.
We could try to play games here with "is stdout a tty", as we do for
color. But that's not a completely reliable signal, and it's
probably not worth the trouble. If you want to see the patch with
the usual bells and whistles, then you are better off using "git
log" or "git show".
- if a project really does have a workflow that likes prefix-less
patches, and the receiver is prepared to use "-p0", then the sender
now has to manually say "--no-prefix" for each format-patch
invocation. That doesn't seem _too_ terrible given that the receiver
has to manually say "-p0" for each git-am invocation.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
