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Author SHA1 Message Date
Junio C Hamano b75dc16ae3 Merge branch 'dl/push-recurse-submodules-fix'
Code cleanup.

* dl/push-recurse-submodules-fix:
  push: unset PARSE_OPT_OPTARG for --recurse-submodules
2020-05-05 14:54:28 -07:00
Junio C Hamano 6652716200 Merge branch 'dl/opt-callback-cleanup'
Code cleanup.

* dl/opt-callback-cleanup:
  Use OPT_CALLBACK and OPT_CALLBACK_F
2020-05-05 14:54:27 -07:00
Junio C Hamano 2c42fb7653 Merge branch 'js/anonymise-push-url-in-errors'
Error and verbose trace messages from "git push" did not redact
credential material embedded in URLs.

* js/anonymise-push-url-in-errors:
  push: anonymize URLs in error messages and warnings
2020-05-01 13:39:59 -07:00
Junio C Hamano dd094c2b75 Merge branch 'es/bugreport'
The "bugreport" tool.

* es/bugreport:
  bugreport: drop extraneous includes
  bugreport: add compiler info
  bugreport: add uname info
  bugreport: gather git version and build info
  bugreport: add tool to generate debugging info
  help: move list_config_help to builtin/help
2020-05-01 13:39:59 -07:00
Junio C Hamano 6d6b412da3 Merge branch 'en/rebase-root-and-fork-point-are-incompatible'
Incompatible options "--root" and "--fork-point" of "git rebase"
have been marked and documented as being incompatible.

* en/rebase-root-and-fork-point-are-incompatible:
  rebase: display an error if --root and --fork-point are both provided
2020-05-01 13:39:58 -07:00
Junio C Hamano 6d56d4c7dc Merge branch 'ds/blame-on-bloom'
"git blame" learns to take advantage of the "changed-paths" Bloom
filter stored in the commit-graph file.

* ds/blame-on-bloom:
  test-bloom: check that we have expected arguments
  test-bloom: fix some whitespace issues
  blame: drop unused parameter from maybe_changed_path
  blame: use changed-path Bloom filters
  tests: write commit-graph with Bloom filters
  revision: complicated pathspecs disable filters
2020-05-01 13:39:54 -07:00
Junio C Hamano 9b6606f43d Merge branch 'gs/commit-graph-path-filter'
Introduce an extension to the commit-graph to make it efficient to
check for the paths that were modified at each commit using Bloom
filters.

* gs/commit-graph-path-filter:
  bloom: ignore renames when computing changed paths
  commit-graph: add GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS test flag
  t4216: add end to end tests for git log with Bloom filters
  revision.c: add trace2 stats around Bloom filter usage
  revision.c: use Bloom filters to speed up path based revision walks
  commit-graph: add --changed-paths option to write subcommand
  commit-graph: reuse existing Bloom filters during write
  commit-graph: write Bloom filters to commit graph file
  commit-graph: examine commits by generation number
  commit-graph: examine changed-path objects in pack order
  commit-graph: compute Bloom filters for changed paths
  diff: halt tree-diff early after max_changes
  bloom.c: core Bloom filter implementation for changed paths.
  bloom.c: introduce core Bloom filter constructs
  bloom.c: add the murmur3 hash implementation
  commit-graph: define and use MAX_NUM_CHUNKS
2020-05-01 13:39:53 -07:00
Junio C Hamano 6a1c17d05b Merge branch 'tb/commit-graph-split-strategy'
"git commit-graph write" learned different ways to write out split
files.

* tb/commit-graph-split-strategy:
  Revert "commit-graph.c: introduce '--[no-]check-oids'"
  commit-graph.c: introduce '--[no-]check-oids'
  commit-graph.h: replace 'commit_hex' with 'commits'
  oidset: introduce 'oidset_size'
  builtin/commit-graph.c: introduce split strategy 'replace'
  builtin/commit-graph.c: introduce split strategy 'no-merge'
  builtin/commit-graph.c: support for '--split[=<strategy>]'
  t/helper/test-read-graph.c: support commit-graph chains
2020-05-01 13:39:52 -07:00
Junio C Hamano 2b4ff3d3dc Merge branch 'tb/reset-shallow'
Fix in-core inconsistency after fetching into a shallow repository
that broke the code to write out commit-graph.

* tb/reset-shallow:
  shallow.c: use '{commit,rollback}_shallow_file'
  t5537: use test_write_lines and indented heredocs for readability
2020-05-01 13:39:51 -07:00
Junio C Hamano d2ea03ddee Merge branch 'ps/transactional-update-ref-stdin'
"git update-ref --stdin" learned a handful of new verbs to let the
user control ref update transactions more explicitly, which helps
as an ingredient to implement two-phase commit-style atomic
ref-updates across multiple repositories.

* ps/transactional-update-ref-stdin:
  update-ref: implement interactive transaction handling
  update-ref: read commands in a line-wise fashion
  update-ref: move transaction handling into `update_refs_stdin()`
  update-ref: pass end pointer instead of strbuf
  update-ref: drop unused argument for `parse_refname`
  update-ref: organize commands in an array
  strbuf: provide function to append whole lines
  git-update-ref.txt: add missing word
  refs: fix segfault when aborting empty transaction
2020-04-29 16:15:31 -07:00
Junio C Hamano 6eacc39b6d Merge branch 'en/fill-directory-exponential'
The directory traversal code had redundant recursive calls which
made its performance characteristics exponential with respect to
the depth of the tree, which was corrected.

* en/fill-directory-exponential:
  completion: fix 'git add' on paths under an untracked directory
  Fix error-prone fill_directory() API; make it only return matches
  dir: replace double pathspec matching with single in treat_directory()
  dir: include DIR_KEEP_UNTRACKED_CONTENTS handling in treat_directory()
  dir: replace exponential algorithm with a linear one
  dir: refactor treat_directory to clarify control flow
  dir: fix confusion based on variable tense
  dir: fix broken comment
  dir: consolidate treat_path() and treat_one_path()
  dir: fix simple typo in comment
  t3000: add more testcases testing a variety of ls-files issues
  t7063: more thorough status checking
2020-04-29 16:15:31 -07:00
Junio C Hamano 48eee46d6a Merge branch 'en/sparse-checkout'
"sparse-checkout" UI improvements.

* en/sparse-checkout:
  sparse-checkout: provide a new reapply subcommand
  unpack-trees: failure to set SKIP_WORKTREE bits always just a warning
  unpack-trees: provide warnings on sparse updates for unmerged paths too
  unpack-trees: make sparse path messages sound like warnings
  unpack-trees: split display_error_msgs() into two
  unpack-trees: rename ERROR_* fields meant for warnings to WARNING_*
  unpack-trees: move ERROR_WOULD_LOSE_SUBMODULE earlier
  sparse-checkout: use improved unpack_trees porcelain messages
  sparse-checkout: use new update_sparsity() function
  unpack-trees: add a new update_sparsity() function
  unpack-trees: pull sparse-checkout pattern reading into a new function
  unpack-trees: do not mark a dirty path with SKIP_WORKTREE
  unpack-trees: allow check_updates() to work on a different index
  t1091: make some tests a little more defensive against failures
  unpack-trees: simplify pattern_list freeing
  unpack-trees: simplify verify_absent_sparse()
  unpack-trees: remove unused error type
  unpack-trees: fix minor typo in comment
2020-04-29 16:15:30 -07:00
Junio C Hamano 3afdeef33e Merge branch 'dl/merge-autostash-rebase-quit-fix'
The stash entry created by "git rebase --autosquash" to keep the
initial dirty state were discarded by mistake upon "git rebase
--quit", which has been corrected.

* dl/merge-autostash-rebase-quit-fix:
  rebase: save autostash entry into stash reflog on --quit
2020-04-29 16:15:27 -07:00
Junio C Hamano bf10200871 Merge branch 'dl/merge-autostash'
"git merge" learns the "--autostash" option.

* dl/merge-autostash: (22 commits)
  pull: pass --autostash to merge
  t5520: make test_pull_autostash() accept expect_parent_num
  merge: teach --autostash option
  sequencer: implement apply_autostash_oid()
  sequencer: implement save_autostash()
  sequencer: unlink autostash in apply_autostash()
  sequencer: extract perform_autostash() from rebase
  rebase: generify create_autostash()
  rebase: extract create_autostash()
  reset: extract reset_head() from rebase
  rebase: generify reset_head()
  rebase: use apply_autostash() from sequencer.c
  sequencer: rename stash_sha1 to stash_oid
  sequencer: make apply_autostash() accept a path
  rebase: use read_oneliner()
  sequencer: make read_oneliner() extern
  sequencer: configurably warn on non-existent files
  sequencer: make read_oneliner() accept flags
  sequencer: make file exists check more efficient
  sequencer: stop leaking buf
  ...
2020-04-29 16:15:27 -07:00
Junio C Hamano dbd5e0a186 Revert "commit-graph.c: introduce '--[no-]check-oids'"
This reverts commit 7a9ce0269b,
which has not yet gained consensus.
2020-04-29 12:44:40 -07:00
Junio C Hamano 33a1060988 Merge branch 'mt/grep-cquote-path'
"git grep" did not quote a path with unusual character like other
commands (like "git diff", "git status") do, but did quote when run
from a subdirectory, both of which has been corrected.

* mt/grep-cquote-path:
  grep: follow conventions for printing paths w/ unusual chars
2020-04-28 15:50:09 -07:00
Junio C Hamano d3fc8dc53a Merge branch 'ds/log-exclude-decoration-config'
The "--decorate-refs" and "--decorate-refs-exclude" options "git
log" takes have learned a companion configuration variable
log.excludeDecoration that sits at the lowest priority in the
family.

* ds/log-exclude-decoration-config:
  log: add log.excludeDecoration config option
  log-tree: make ref_filter_match() a helper method
2020-04-28 15:50:08 -07:00
Junio C Hamano 5a96715eb7 Merge branch 'tb/diff-tree-with-notes'
"git diff-tree --pretty --notes" used to hit an assertion failure,
as it forgot to initialize the notes subsystem.

* tb/diff-tree-with-notes:
  diff-tree.c: load notes machinery when required
2020-04-28 15:50:07 -07:00
Junio C Hamano e81ecff10a Merge branch 'js/stash-p-fix'
Allowing the user to split a patch hunk while "git stash -p" does
not work well; a band-aid has been added to make this (partially)
work better.

* js/stash-p-fix:
  stash -p: (partially) fix bug concerning split hunks
  t3904: fix incorrect demonstration of a bug
2020-04-28 15:50:06 -07:00
Junio C Hamano 56a1d9ca6b Merge branch 'dl/libify-a-few'
Code in builtin/*, i.e. those can only be called from within
built-in subcommands, that implements bulk of a couple of
subcommands have been moved to libgit.a so that they could be used
by others.

* dl/libify-a-few:
  Lib-ify prune-packed
  Lib-ify fmt-merge-msg
2020-04-28 15:50:05 -07:00
Junio C Hamano 8f5dc5a4af Merge branch 'jt/avoid-prefetch-when-able-in-diff'
"git diff" in a partial clone learned to avoid lazy loading blob
objects in more casese when they are not needed.

* jt/avoid-prefetch-when-able-in-diff:
  diff: restrict when prefetching occurs
  diff: refactor object read
  diff: make diff_populate_filespec_options struct
  promisor-remote: accept 0 as oid_nr in function
2020-04-28 15:50:04 -07:00
Junio C Hamano 25b336421f Merge branch 'ds/commit-graph-expiry-fix'
"git commit-graph write --expire-time=<timestamp>" did not use the
given timestamp correctly, which has been corrected.

* ds/commit-graph-expiry-fix:
  commit-graph: fix buggy --expire-time option
2020-04-28 15:50:02 -07:00
Junio C Hamano 9404128b34 Merge branch 'jc/log-no-mailmap'
"git log" learns "--[no-]mailmap" as a synonym to "--[no-]use-mailmap"

* jc/log-no-mailmap:
  log: give --[no-]use-mailmap a more sensible synonym --[no-]mailmap
  clone: reorder --recursive/--recurse-submodules
  parse-options: teach "git cmd -h" to show alias as alias
2020-04-28 15:50:00 -07:00
Junio C Hamano 342bc9e29f Merge branch 'jk/config-use-size-t'
The config API made mixed uses of int and size_t types to represent
length of various pieces of text it parsed, which has been updated
to use the correct type (i.e. size_t) throughout.

* jk/config-use-size-t:
  config: reject parsing of files over INT_MAX
  config: use size_t to store parsed variable baselen
  git_config_parse_key(): return baselen as size_t
  config: drop useless length variable in write_pair()
  parse_config_key(): return subsection len as size_t
  remote: drop auto-strlen behavior of make_branch() and make_rewrite()
2020-04-28 15:49:58 -07:00
Junio C Hamano 2abd648b17 Merge branch 'bc/constant-memequal'
Validation of push certificate has been made more robust against
timing attacks.

* bc/constant-memequal:
  receive-pack: compilation fix
  builtin/receive-pack: use constant-time comparison for HMAC value
2020-04-28 15:49:57 -07:00
Johannes Schindelin d192fa5006 push: anonymize URLs in error messages and warnings
Just like 47abd85ba0 (fetch: Strip usernames from url's before storing
them, 2009-04-17) and later 882d49ca5c (push: anonymize URL in status
output, 2016-07-13), and even later c1284b21f2 (curl: anonymize URLs
in error messages and warnings, 2019-03-04) this change anonymizes URLs
(read: strips them of user names and especially passwords) in
user-facing error messages and warnings.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Reviewed-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-28 15:17:45 -07:00
Denton Liu 9b2df3e8d0 rebase: save autostash entry into stash reflog on --quit
In a03b55530a (merge: teach --autostash option, 2020-04-07), the
--autostash option was introduced for `git merge`. Notably, when
`git merge --quit` is run with an autostash entry present, it is saved
into the stash reflog. This is contrasted with the current behaviour of
`git rebase --quit` where the autostash entry is simply just dropped out
of existence.

Adopt the behaviour of `git merge --quit` in `git rebase --quit` and
save the autostash entry into the stash reflog instead of just deleting
it.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-28 12:35:38 -07:00
Denton Liu ce9baf234f push: unset PARSE_OPT_OPTARG for --recurse-submodules
When the usage for `git push` is shown, it includes the following
lines

	--recurse-submodules[=(check|on-demand|no)]
			      control recursive pushing of submodules

which seem to indicate that the argument for --recurse-submodules is
optional. However, we cannot actually run that optiion without an
argument:

	$ git push --recurse-submodules
	fatal: recurse-submodules missing parameter

Unset PARSE_OPT_OPTARG so that it is clear that this option requires an
argument. Since the parse-options machinery guarantees that an argument
is present now, assume that `arg` is set in the else of
option_parse_recurse_submodules().

Reported-by: Andrew White <andrew.white@audinate.com>
Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-28 10:47:42 -07:00
Denton Liu 203c85339f Use OPT_CALLBACK and OPT_CALLBACK_F
In the codebase, there are many options which use OPTION_CALLBACK in a
plain ol' struct definition. However, we have the OPT_CALLBACK and
OPT_CALLBACK_F macros which are meant to abstract these plain struct
definitions away. These macros are useful as they semantically signal to
developers that these are just normal callback option with nothing fancy
happening.

Replace plain struct definitions of OPTION_CALLBACK with OPT_CALLBACK or
OPT_CALLBACK_F where applicable. The heavy lifting was done using the
following (disgusting) shell script:

	#!/bin/sh

	do_replacement () {
		tr '\n' '\r' |
			sed -e 's/{\s*OPTION_CALLBACK,\s*\([^,]*\),\([^,]*\),\([^,]*\),\([^,]*\),\([^,]*\),\s*0,\(\s*[^[:space:]}]*\)\s*}/OPT_CALLBACK(\1,\2,\3,\4,\5,\6)/g' |
			sed -e 's/{\s*OPTION_CALLBACK,\s*\([^,]*\),\([^,]*\),\([^,]*\),\([^,]*\),\([^,]*\),\([^,]*\),\(\s*[^[:space:]}]*\)\s*}/OPT_CALLBACK_F(\1,\2,\3,\4,\5,\6,\7)/g' |
			tr '\r' '\n'
	}

	for f in $(git ls-files \*.c)
	do
		do_replacement <"$f" >"$f.tmp"
		mv "$f.tmp" "$f"
	done

The result was manually inspected and then reformatted to match the
style of the surrounding code. Finally, using
`git grep OPTION_CALLBACK \*.c`, leftover results which were not handled
by the script were manually transformed.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-28 10:47:10 -07:00
Elijah Newren a35413c378 rebase: display an error if --root and --fork-point are both provided
--root implies we want to rebase all commits since the beginning of
history.  --fork-point means we want to use the reflog of the specified
upstream to find the best common ancestor between <upstream> and
<branch> and only rebase commits since that common ancestor.  These
options are clearly contradictory, so throw an error (instead of
segfaulting on a NULL pointer) if both are specified.

Reported-by: Alexander Berg <alexander.berg@atos.net>
Documentation-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-27 11:51:26 -07:00
Taylor Blau 37b9dcabfc shallow.c: use '{commit,rollback}_shallow_file'
In bd0b42aed3 (fetch-pack: do not take shallow lock unnecessarily,
2019-01-10), the author noted that 'is_repository_shallow' produces
visible side-effect(s) by setting 'is_shallow' and 'shallow_stat'.

This is a problem for e.g., fetching with '--update-shallow' in a
shallow repository with 'fetch.writeCommitGraph' enabled, since the
update to '.git/shallow' will cause Git to think that the repository
isn't shallow when it is, thereby circumventing the commit-graph
compatibility check.

This causes problems in shallow repositories with at least shallow refs
that have at least one ancestor (since the client won't have those
objects, and therefore can't take the reachability closure over commits
when writing a commit-graph).

Address this by introducing thin wrappers over 'commit_lock_file' and
'rollback_lock_file' for use specifically when the lock is held over
'.git/shallow'. These wrappers (appropriately called
'commit_shallow_file' and 'rollback_shallow_file') call into their
respective functions in 'lockfile.h', but additionally reset validity
checks used by the shallow machinery.

Replace each instance of 'commit_lock_file' and 'rollback_lock_file'
with 'commit_shallow_file' and 'rollback_shallow_file' when the lock
being held is over the '.git/shallow' file.

As a result, 'prune_shallow' can now only be called once (since
'check_shallow_file_for_update' will die after calling
'reset_repository_shallow'). But, this is OK since we only call
'prune_shallow' at most once per process.

Helped-by: Jonathan Tan <jonathantanmy@google.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Reviewed-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-24 13:56:39 -07:00
Junio C Hamano d6d561db1c Merge branch 'jt/rebase-allow-duplicate'
Allow "git rebase" to reapply all local commits, even if the may be
already in the upstream, without checking first.

* jt/rebase-allow-duplicate:
  rebase --merge: optionally skip upstreamed commits
2020-04-22 13:43:00 -07:00
Junio C Hamano c7d8f69da5 Merge branch 'en/rebase-no-keep-empty'
"git rebase" (again) learns to honor "--no-keep-empty", which lets
the user to discard commits that are empty from the beginning (as
opposed to the ones that become empty because of rebasing).  The
interactive rebase also marks commits that are empty in the todo.

* en/rebase-no-keep-empty:
  rebase: fix an incompatible-options error message
  rebase: reinstate --no-keep-empty
  rebase -i: mark commits that begin empty in todo editor
2020-04-22 13:43:00 -07:00
Junio C Hamano 33feaca6bf Merge branch 'js/flush-prompt-before-interative-input'
The interactive input from various codepaths are consolidated and
any prompt possibly issued earlier are fflush()ed before we read.

* js/flush-prompt-before-interative-input:
  interactive: explicitly `fflush` stdout before expecting input
  interactive: refactor code asking the user for interactive input
2020-04-22 13:42:58 -07:00
Junio C Hamano 82fa169d55 Merge branch 'ma/simplify-merge-config-parsing'
Code simplification.

* ma/simplify-merge-config-parsing:
  merge: use skip_prefix to parse config key
2020-04-22 13:42:56 -07:00
Junio C Hamano f4216e5968 Merge branch 'eb/format-patch-no-encode-headers'
The output from "git format-patch" uses RFC 2047 encoding for
non-ASCII letters on From: and Subject: headers, so that it can
directly be fed to e-mail programs.  A new option has been added
to produce these headers in raw.

* eb/format-patch-no-encode-headers:
  format-patch: teach --no-encode-email-headers
2020-04-22 13:42:54 -07:00
Junio C Hamano fc3f6fd7be Merge branch 'dd/no-gpg-sign'
"git rebase" learned the "--no-gpg-sign" option to countermand
commit.gpgSign the user may have.

* dd/no-gpg-sign:
  Documentation: document merge option --no-gpg-sign
  Documentation: merge commit-tree --[no-]gpg-sign
  Documentation: reword commit --no-gpg-sign
  Documentation: document am --no-gpg-sign
  cherry-pick/revert: honour --no-gpg-sign in all case
  rebase.c: honour --no-gpg-sign
2020-04-22 13:42:53 -07:00
Junio C Hamano 3ea2b46628 Merge branch 'jk/use-quick-lookup-in-clone-for-tag-following'
The logic to auto-follow tags by "git clone --single-branch" was
not careful to avoid lazy-fetching unnecessary tags, which has been
corrected.

* jk/use-quick-lookup-in-clone-for-tag-following:
  clone: use "quick" lookup while following tags
2020-04-22 13:42:51 -07:00
Junio C Hamano a768f866e9 Merge branch 'jk/oid-array-cleanups'
Code cleanup.

* jk/oid-array-cleanups:
  oidset: stop referring to sha1-array
  ref-filter: stop referring to "sha1 array"
  bisect: stop referring to sha1_array
  test-tool: rename sha1-array to oid-array
  oid_array: rename source file from sha1-array
  oid_array: use size_t for iteration
  oid_array: use size_t for count and allocation
2020-04-22 13:42:49 -07:00
Junio C Hamano dfdce31ce6 Merge branch 'en/pull-do-not-rebase-after-fast-forwarding'
"git pull --rebase" tried to run a rebase even after noticing that
the pull results in a fast-forward and no rebase is needed nor
sensible, for the past few years due to a mistake nobody noticed.

* en/pull-do-not-rebase-after-fast-forwarding:
  pull: avoid running both merge and rebase
2020-04-22 13:42:47 -07:00
Junio C Hamano 9f471e4b95 Merge branch 'rs/pull-options-sync-code-and-doc'
"git pull" shares many options with underlying "git fetch", but
some of them were not documented and some of those that would make
sense to pass down were not passed down.

* rs/pull-options-sync-code-and-doc:
  pull: pass documented fetch options on
  pull: remove --update-head-ok from documentation
2020-04-22 13:42:45 -07:00
Junio C Hamano 0c601052a5 Merge branch 'jt/connectivity-check-optim-in-partial-clone'
Simplify the commit ancestry connectedness check in a partial clone
repository in which "promised" objects are assumed to be obtainable
lazily on-demand from promisor remote repositories.

* jt/connectivity-check-optim-in-partial-clone:
  connected: always use partial clone optimization
2020-04-22 13:42:43 -07:00
Junio C Hamano 719483e547 receive-pack: compilation fix
We do not use C99 "for loop initial declaration" in our codebase
(yet), but one snuck in.

Reported-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-22 08:55:11 -07:00
Taylor Blau 5778b22b3d diff-tree.c: load notes machinery when required
Since its introduction in 7249e91 (revision.c: support --notes
command-line option, 2011-03-29), combining '--notes' with any option
that causes us to format notes (e.g., '--pretty', '--format="%N"', etc)
results in a failed assertion at runtime.

  $ git rev-list HEAD | git diff-tree --stdin --pretty=medium --notes
  commit 8f3d9f354286745c751374f5f1fcafee6b3f3136
  git: notes.c:1308: format_display_notes: Assertion `display_notes_trees' failed.
  Aborted

This failure is due to diff-tree not calling 'load_display_notes' to
initialize the notes machinery.

Ordinarily, this failure isn't triggered, because it requires passing
both '--notes' and another of the above mentioned options. In the case
of '--pretty', for example, we set 'opt->verbose_header', causing
'show_log()' to eventually call 'format_display_notes()', which expects
a non-NULL 'display_note_trees'.

Without initializing the notes machinery, 'display_note_trees' remains
NULL, and thus triggers an assertion failure.

Fix this by initializing the notes machinery after parsing our options,
and harden this behavior against regression with a test in t4013. (Note
that the added ref in this test requires updating two unrelated tests
which use 'log --all', and thus need to learn about the new refs).

Reported-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-20 18:22:54 -07:00
Matheus Tavares 45115d8490 grep: follow conventions for printing paths w/ unusual chars
grep does not follow the conventions used by other Git commands when
printing paths that contain unusual characters (as double-quotes or
newlines). Commands such as ls-files, commit, status and diff will:

- Quote and escape unusual pathnames, by default.
- Print names verbatim and unquoted when "-z" is used.

But grep *never* quotes/escapes absolute paths with unusual chars and
*always* quotes/escapes relative ones, even with "-z". Besides being
inconsistent in its own output, the deviation from other Git commands
can be confusing. So let's make it follow the two rules above and add
some tests for this new behavior. Note that, making grep quote/escape
all unusual paths by default, also make it fully compliant with the
core.quotePath configuration, which is currently ignored for absolute
paths.

Reported-by: Greg Hurrell <greg@hurrell.net>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-20 13:01:43 -07:00
Derrick Stolee 0906ac2b54 blame: use changed-path Bloom filters
The changed-path Bloom filters help reduce the amount of tree
parsing required during history queries. Before calculating a
diff, we can ask the filter if a path changed between a commit
and its first parent. If the filter says "no" then we can move
on without parsing trees. If the filter says "maybe" then we
parse trees to discover if the answer is actually "yes" or "no".

When computing a blame, there is a section in find_origin() that
computes a diff between a commit and one of its parents. When this
is the first parent, we can check the Bloom filters before calling
diff_tree_oid().

In order to make this work with the blame machinery, we need to
initialize a struct bloom_key with the initial path. But also, we
need to add more keys to a list if a rename is detected. We then
check to see if _any_ of these keys answer "maybe" in the diff.

During development, I purposefully left out this "add a new key
when a rename is detected" to see if the test suite would catch
my error. That is how I discovered the issues with
GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS from the previous change.
With that change, we can feel some confidence in the coverage of
this change.

If a user requests copy detection using "git blame -C", then there
are more places where the set of "important" files can expand. I
do not know enough about how this happens in the blame machinery.
Thus, the Bloom filter integration is explicitly disabled in this
mode. A later change could expand the bloom_key data with an
appropriate call (or calls) to add_bloom_key().

If we did not disable this mode, then the following tests would
fail:

	t8003-blame-corner-cases.sh
	t8011-blame-split-file.sh

Generally, this is a performance enhancement and should not
change the behavior of 'git blame' in any way. If a repo has a
commit-graph file with computed changed-path Bloom filters, then
they should notice improved performance for their 'git blame'
commands.

Here are some example timings that I found by blaming some paths
in the Linux kernel repository:

 git blame arch/x86/kernel/topology.c >/dev/null

 Before: 0.83s
  After: 0.24s

 git blame kernel/time/time.c >/dev/null

 Before: 0.72s
  After: 0.24s

 git blame tools/perf/ui/stdio/hist.c >/dev/null

 Before: 0.27s
  After: 0.11s

I specifically looked for "deep" paths that were also edited many
times. As a counterpoint, the MAINTAINERS file was edited many
times but is located in the root tree. This means that the cost of
computing a diff relative to the pathspec is very small. Here are
the timings for that command:

 git blame MAINTAINERS >/dev/null

 Before: 20.1s
  After: 18.0s

These timings are the best of five. The worst-case runs were on the
order of 2.5 minutes for both cases. Note that the MAINTAINERS file
has 18,740 lines across 17,000+ commits. This happens to be one of
the cases where this change provides the least improvement.

The lack of improvement for the MAINTAINERS file and the relatively
modest improvement for the other examples can be easily explained.
The blame machinery needs to compute line-level diffs to determine
which lines were changed by each commit. That makes up a large
proportion of the computation time, and this change does not
attempt to improve on that section of the algorithm. The
MAINTAINERS file is large and changed often, so it takes time to
determine which lines were updated by which commit. In contrast,
the code files are much smaller, and it takes longer to comute
the line-by-line diff for a single patch on the Linux mailing
lists.

Outside of the "-C" integration, I believe there is little more to
gain from the changed-path Bloom filters for 'git blame' after this
patch.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-16 15:38:06 -07:00
Derrick Stolee b23ea9790d tests: write commit-graph with Bloom filters
The GIT_TEST_COMMIT_GRAPH environment variable updates the commit-
graph file whenever "git commit" is run, ensuring that we always
have an updated commit-graph throughout the test suite. The
GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS environment variable was
introduced to write the changed-path Bloom filters whenever "git
commit-graph write" is run. However, the GIT_TEST_COMMIT_GRAPH
trick doesn't launch a separate process and instead writes it
directly.

To expand the number of tests that have commits in the commit-graph
file, add a helper method that computes the commit-graph and place
that helper inside "git commit" and "git merge".

In the helper method, check GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS
to ensure we are writing changed-path Bloom filters whenever
possible.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-16 15:38:04 -07:00
Emily Shaffer 709df95b78 help: move list_config_help to builtin/help
Starting in 3ac68a93fd, help.o began to depend on builtin/branch.o,
builtin/clean.o, and builtin/config.o. This meant that help.o was
unusable outside of the context of the main Git executable.

To make help.o usable by other commands again, move list_config_help()
into builtin/help.c (where it makes sense to assume other builtin libraries
are present).

When command-list.h is included but a member is not used, we start to
hear a compiler warning. Since the config list is generated in a fairly
different way than the command list, and since commands and config
options are semantically different, move the config list into its own
header and move the generator into its own script and build rule.

For reasons explained in 976aaedc (msvc: add a Makefile target to
pre-generate the Visual Studio solution, 2019-07-29), some build
artifacts we consider non-source files cannot be generated in the
Visual Studio environment, and we already have some Makefile tweaks
to help Visual Studio to use generated command-list.h header file.
Do the same to a new generated file, config-list.h, introduced by
this change.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
2020-04-16 15:22:16 -07:00
Derrick Stolee a6be5e6764 log: add log.excludeDecoration config option
In 'git log', the --decorate-refs-exclude option appends a pattern
to a string_list. This list is used to prevent showing some refs
in the decoration output, or even by --simplify-by-decoration.

Users may want to use their refs space to store utility refs that
should not appear in the decoration output. For example, Scalar [1]
runs a background fetch but places the "new" refs inside the
refs/scalar/hidden/<remote>/* refspace instead of refs/<remote>/*
to avoid updating remote refs when the user is not looking. However,
these "hidden" refs appear during regular 'git log' queries.

A similar idea to use "hidden" refs is under consideration for core
Git [2].

Add the 'log.excludeDecoration' config option so users can exclude
some refs from decorations by default instead of needing to use
--decorate-refs-exclude manually. The config value is multi-valued
much like the command-line option. The documentation is careful to
point out that the config value can be overridden by the
--decorate-refs option, even though --decorate-refs-exclude would
always "win" over --decorate-refs.

Since the 'log.excludeDecoration' takes lower precedence to
--decorate-refs, and --decorate-refs-exclude takes higher
precedence, the struct decoration_filter needed another field.
This led also to new logic in load_ref_decorations() and
ref_filter_match().

There are several tests in t4202-log.sh that test the
--decorate-refs-(include|exclude) options, so these are extended.
Since the expected output is already stored as a file, most tests
could simply replace a "--decorate-refs-exclude" option with an
in-line config setting. Other tests involve the precedence of
the config option compared to command-line options and needed more
modification.

[1] https://github.com/microsoft/scalar
[2] https://lore.kernel.org/git/77b1da5d3063a2404cd750adfe3bb8be9b6c497d.1585946894.git.gitgitgadget@gmail.com/

Helped-by: Junio C Hamano <gister@pobox.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-16 11:05:48 -07:00
Taylor Blau 7a9ce0269b commit-graph.c: introduce '--[no-]check-oids'
When operating on a stream of commit OIDs on stdin, 'git commit-graph
write' checks that each OID refers to an object that is indeed a commit.
This is convenient to make sure that the given input is well-formed, but
can sometimes be undesirable.

For example, server operators may wish to feed the refnames that were
updated during a push to 'git commit-graph write --input=stdin-commits',
and silently discard refs that don't point at commits. This can be done
by combing the output of 'git for-each-ref' with '--format
%(*objecttype)', but this requires opening up a potentially large number
of objects.  Instead, it is more convenient to feed the updated refs to
the commit-graph machinery, and let it throw out refs that don't point
to commits.

Introduce '--[no-]check-oids' to make such a behavior possible. With
'--check-oids' (the default behavior to retain backwards compatibility),
'git commit-graph write' will barf on a non-commit line in its input.
With 'no-check-oids', such lines will be silently ignored, making the
above possible by specifying this option.

No matter which is supplied, 'git commit-graph write' retains the
behavior from the previous commit of rejecting non-OID inputs like
"HEAD" and "refs/heads/foo" as before.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-15 09:20:34 -07:00