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2017-12-13Merge branch 'pc/submodule-helper'Libravatar Junio C Hamano1-1/+1
A message fix. * pc/submodule-helper: submodule--helper.c: i18n: add a missing space in message
2017-12-13Merge branch 'ra/decorate-limit-refs'Libravatar Junio C Hamano1-1/+9
The tagnames "git log --decorate" uses to annotate the commits can now be limited to subset of available refs with the two additional options, --decorate-refs[-exclude]=<pattern>. * ra/decorate-limit-refs: log: add option to choose which refs to decorate
2017-12-13Merge branch 'bc/hash-algo'Libravatar Junio C Hamano4-4/+4
An infrastructure to define what hash function is used in Git is introduced, and an effort to plumb that throughout various codepaths has been started. * bc/hash-algo: repository: fix a sparse 'using integer as NULL pointer' warning Switch empty tree and blob lookups to use hash abstraction Integrate hash algorithm support with repo setup Add structure representing hash algorithm setup: expose enumerated repo info
2017-12-06Merge branch 'bw/protocol-v1'Libravatar Junio C Hamano1-0/+17
A new mechanism to upgrade the wire protocol in place is proposed and demonstrated that it works with the older versions of Git without harming them. * bw/protocol-v1: Documentation: document Extra Parameters ssh: introduce a 'simple' ssh variant i5700: add interop test for protocol transition http: tell server that the client understands v1 connect: tell server that the client understands v1 connect: teach client to recognize v1 server response upload-pack, receive-pack: introduce protocol version 1 daemon: recognize hidden request arguments protocol: introduce protocol extension mechanisms pkt-line: add packet_write function connect: in ref advertisement, shallows are last
2017-12-06Merge branch 'rd/doc-notes-prune-fix'Libravatar Junio C Hamano1-1/+1
Doc update. * rd/doc-notes-prune-fix: notes: correct 'git notes prune' options to '[-n] [-v]'
2017-12-06Merge branch 'rd/man-prune-progress'Libravatar Junio C Hamano1-1/+1
Doc update. * rd/man-prune-progress: prune: add "--progress" to man page and usage msg
2017-12-06Merge branch 'hm/config-parse-expiry-date'Libravatar Junio C Hamano2-13/+11
"git config --expiry-date gc.reflogexpire" can read "2.weeks" from the configuration and report it as a timestamp, just like "--int" would read "1k" and report 1024, to help consumption by scripts. * hm/config-parse-expiry-date: config: add --expiry-date
2017-11-28Merge branch 'ma/branch-list-paginate'Libravatar Junio C Hamano1-0/+3
"git branch --list" learned to show its output through the pager by default when the output is going to a terminal, which is controlled by the pager.branch configuration variable. This is similar to a recent change to "git tag --list". * ma/branch-list-paginate: branch: change default of `pager.branch` to "on" branch: respect `pager.branch` in list-mode only t7006: add tests for how git branch paginates
2017-11-28Merge branch 'jc/branch-name-sanity'Libravatar Junio C Hamano2-12/+9
"git branch" and "git checkout -b" are now forbidden from creating a branch whose name is "HEAD". * jc/branch-name-sanity: builtin/branch: remove redundant check for HEAD branch: correctly reject refs/heads/{-dash,HEAD} branch: split validate_new_branchname() into two branch: streamline "attr_only" handling in validate_new_branchname()
2017-11-27Merge branch 'sw/pull-ipv46-passthru'Libravatar Junio C Hamano1-0/+12
Contrary to the documentation, "git pull -4/-6 other-args" did not ask the underlying "git fetch" to go over IPv4/IPv6, which has been corrected. * sw/pull-ipv46-passthru: pull: pass -4/-6 option to 'git fetch'
2017-11-27Merge branch 'tb/add-renormalize'Libravatar Junio C Hamano1-2/+26
"git add --renormalize ." is a new and safer way to record the fact that you are correcting the end-of-line convention and other "convert_to_git()" glitches in the in-repository data. * tb/add-renormalize: add: introduce "--renormalize"
2017-11-27Merge branch 'tz/notes-error-to-stderr'Libravatar Junio C Hamano1-4/+4
"git notes" sent its error message to its standard output stream, which was corrected. * tz/notes-error-to-stderr: notes: send "Automatic notes merge failed" messages to stderr
2017-11-26submodule--helper.c: i18n: add a missing space in messageLibravatar Jean-Noel Avila1-1/+1
The message spans over 2 lines but the C concatenation does not add the needed space between the two lines. Signed-off-by: Jean-Noel Avila <jn.avila@free.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-22log: add option to choose which refs to decorateLibravatar Rafael Ascensão1-1/+9
When `log --decorate` is used, git will decorate commits with all available refs. While in most cases this may give the desired effect, under some conditions it can lead to excessively verbose output. Introduce two command line options, `--decorate-refs=<pattern>` and `--decorate-refs-exclude=<pattern>` to allow the user to select which refs are used in decoration. When "--decorate-refs=<pattern>" is given, only the refs that match the pattern are used in decoration. The refs that match the pattern when "--decorate-refs-exclude=<pattern>" is given, are never used in decoration. These options follow the same convention for mixing negative and positive patterns across the system, assuming that the inclusive default is to match all refs available. (1) if there is no positive pattern given, pretend as if an inclusive default positive pattern was given; (2) for each candidate, reject it if it matches no positive pattern, or if it matches any one of the negative patterns. The rules for what is considered a match are slightly different from the rules used elsewhere. Commands like `log --glob` assume a trailing '/*' when glob chars are not present in the pattern. This makes it difficult to specify a single ref. On the other hand, commands like `describe --match --all` allow specifying exact refs, but do not have the convenience of allowing "shorthand refs" like 'refs/heads' or 'heads' to refer to 'refs/heads/*'. The commands introduced in this patch consider a match if: (a) the pattern contains globs chars, and regular pattern matching returns a match. (b) the pattern does not contain glob chars, and ref '<pattern>' exists, or if ref exists under '<pattern>/' This allows both behaviours (allowing single refs and shorthand refs) yet remaining compatible with existent commands. Helped-by: Kevin Daudt <me@ikke.info> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Rafael Ascensão <rafa.almas@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-22notes: correct 'git notes prune' options to '[-n] [-v]'Libravatar Robert P. J. Day1-1/+1
Currently, 'git notes prune' in man page and usage message incorrectly lists options as '[-n | -v]', rather than '[-n] [-v]'. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-22prune: add "--progress" to man page and usage msgLibravatar Robert P. J. Day1-1/+1
Add mention of git prune's "--progress" option to the SYNOPSIS and DESCRIPTION sections of the man page, and to the usage message of "git prune" itself. While we're here, move the explanation of "--" toward the end of the DESCRIPTION section, where it belongs. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-21Merge branch 'bp/fsmonitor'Libravatar Junio C Hamano2-3/+43
We learned to talk to watchman to speed up "git status" and other operations that need to see which paths have been modified. * bp/fsmonitor: fsmonitor: preserve utf8 filenames in fsmonitor-watchman log fsmonitor: read entirety of watchman output fsmonitor: MINGW support for watchman integration fsmonitor: add a performance test fsmonitor: add a sample integration script for Watchman fsmonitor: add test cases for fsmonitor extension split-index: disable the fsmonitor extension when running the split index test fsmonitor: add a test tool to dump the index extension update-index: add fsmonitor support to update-index ls-files: Add support in ls-files to display the fsmonitor valid bit fsmonitor: add documentation for the fsmonitor extension. fsmonitor: teach git to optionally utilize a file system monitor to speed up detecting new or changed files. update-index: add a new --force-write-index option preload-index: add override to enable testing preload-index bswap: add 64 bit endianness helper get_be64
2017-11-21pull: pass -4/-6 option to 'git fetch'Libravatar Shuyu Wei1-0/+12
The -4/-6 option should be passed through to 'git fetch' to be consistent with the man page. Signed-off-by: Wei Shuyu <wsy@dogben.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-20branch: change default of `pager.branch` to "on"Libravatar Martin Ågren1-1/+1
This is similar to ff1e72483 (tag: change default of `pager.tag` to "on", 2017-08-02) and is safe now that we do not consider `pager.branch` at all when we are not listing branches. This change will help with listing many branches, but will not hurt users of `git branch --edit-description` as it would have before the previous commit. Signed-off-by: Martin Ågren <martin.agren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-20branch: respect `pager.branch` in list-mode onlyLibravatar Martin Ågren1-0/+3
Similar to de121ffe5 (tag: respect `pager.tag` in list-mode only, 2017-08-02), use the DELAY_PAGER_CONFIG-mechanism to only respect `pager.branch` when we are listing branches. We have two possibilities of generalizing what that earlier commit made to `git tag`. One is to interpret, e.g., --set-upstream-to as "it does not use an editor, so we should page". Another, the one taken by this commit, is to say "it does not list, so let's not page". That is in line with the approach of the series on `pager.tag` and in particular the wording in Documentation/git-tag.txt, which this commit reuses for git-branch.txt. This fixes the failing test added in the previous commit. Also adapt the test for whether `git branch --set-upstream-to` respects `pager.branch`. Signed-off-by: Martin Ågren <martin.agren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-18config: add --expiry-dateLibravatar Haaris Mehmood2-13/+11
Add --expiry-date as a data-type for config files when 'git config --get' is used. This will return any relative or fixed dates from config files as timestamps. This is useful for scripts (e.g. gc.reflogexpire) that work with timestamps so that '2.weeks' can be converted to a format acceptable by those scripts/functions. Following the convention of git_config_pathname(), move the helper function required for this feature from builtin/reflog.c to builtin/config.c where other similar functions exist (e.g. for --bool or --path), and match the order of parameters with other functions (i.e. output pointer as first parameter). Signed-off-by: Haaris Mehmood <hsed@unimetic.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-17add: introduce "--renormalize"Libravatar Torsten Bögershausen1-2/+26
Make it safer to normalize the line endings in a repository. Files that had been commited with CRLF will be commited with LF. The old way to normalize a repo was like this: # Make sure that there are not untracked files $ echo "* text=auto" >.gitattributes $ git read-tree --empty $ git add . $ git commit -m "Introduce end-of-line normalization" The user must make sure that there are no untracked files, otherwise they would have been added and tracked from now on. The new "add --renormalize" does not add untracked files: $ echo "* text=auto" >.gitattributes $ git add --renormalize . $ git commit -m "Introduce end-of-line normalization" Note that "git add --renormalize <pathspec>" is the short form for "git add -u --renormalize <pathspec>". While at it, document that the same renormalization may be needed, whenever a clean filter is added or changed. Helped-By: Junio C Hamano <gitster@pobox.com> Signed-off-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-15Merge branch 'bp/read-index-from-skip-verification'Libravatar Junio C Hamano1-0/+1
Drop (perhaps overly cautious) sanity check before using the index read from the filesystem at runtime. * bp/read-index-from-skip-verification: read_index_from(): speed index loading by skipping verification of the entry order
2017-11-15Merge branch 'rd/bisect-view-is-visualize'Libravatar Junio C Hamano1-1/+1
Doc and message updates to teach users "bisect view" is a synonym for "bisect visualize". * rd/bisect-view-is-visualize: bisect: mention "view" as an alternative to "visualize"
2017-11-15Merge branch 'ma/reduce-heads-leakfix'Libravatar Junio C Hamano5-22/+28
Leak fixes. * ma/reduce-heads-leakfix: reduce_heads: fix memory leaks builtin/merge-base: free commit lists
2017-11-15Merge branch 'mh/tidy-ref-update-flags'Libravatar Junio C Hamano8-12/+12
Code clean-up in refs API implementation. * mh/tidy-ref-update-flags: refs: update some more docs to use "oid" rather than "sha1" write_packed_entry(): take `object_id` arguments refs: rename constant `REF_ISPRUNING` to `REF_IS_PRUNING` refs: rename constant `REF_NODEREF` to `REF_NO_DEREF` refs: tidy up and adjust visibility of the `ref_update` flags ref_transaction_add_update(): remove a check ref_transaction_update(): die on disallowed flags prune_ref(): call `ref_transaction_add_update()` directly files_transaction_prepare(): don't leak flags to packed transaction
2017-11-15Merge branch 'ma/bisect-leakfix'Libravatar Junio C Hamano1-2/+1
Leak fixes. * ma/bisect-leakfix: bisect: fix memory leak when returning best element bisect: fix off-by-one error in `best_bisection_sorted()` bisect: fix memory leak in `find_bisection()` bisect: change calling-convention of `find_bisection()`
2017-11-15builtin/branch: remove redundant check for HEADLibravatar Kaartic Sivaraam1-3/+0
The lower level code has been made to handle this case for the sake of consistency. This has made this check redundant. So, remove the redundant check. Signed-off-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-15notes: send "Automatic notes merge failed" messages to stderrLibravatar Todd Zullinger1-4/+4
All other error messages from notes use stderr. Do the same when alerting users of an unresolved notes merge. Fix the output redirection in t3310 and t3320 as well. Previously, the tests directed output to a file, but stderr was either not captured or not sent to the file due to the order of the redirection operators. Signed-off-by: Todd Zullinger <tmz@pobox.com> Acked-by: Johan Herland <johan@herland.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-13Merge branch 'jm/status-ignored-files-list'Libravatar Junio C Hamano1-6/+25
The set of paths output from "git status --ignored" was tied closely with its "--untracked=<mode>" option, but now it can be controlled more flexibly. Most notably, a directory that is ignored because it is listed to be ignored in the ignore/exclude mechanism can be handled differently from a directory that ends up to be ignored only because all files in it are ignored. * jm/status-ignored-files-list: status: test ignored modes status: document options to show matching ignored files status: report matching ignored and normal untracked status: add option to show ignored files differently
2017-11-13Switch empty tree and blob lookups to use hash abstractionLibravatar brian m. carlson4-4/+4
Switch the uses of empty_tree_oid and empty_blob_oid to use the current_hash abstraction that represents the current hash algorithm in use. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-13bisect: mention "view" as an alternative to "visualize"Libravatar Robert P. J. Day1-1/+1
Tweak a small number of files to mention "view" as an alternative to "visualize". Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-09Merge branch 'bw/diff-opt-impl-to-bitfields'Libravatar Junio C Hamano10-37/+37
A single-word "unsigned flags" in the diff options is being split into a structure with many bitfields. * bw/diff-opt-impl-to-bitfields: diff: make struct diff_flags members lowercase diff: remove DIFF_OPT_CLR macro diff: remove DIFF_OPT_SET macro diff: remove DIFF_OPT_TST macro diff: remove touched flags diff: add flag to indicate textconv was set via cmdline diff: convert flags to be stored in bitfields add, reset: use DIFF_OPT_SET macro to set a diff flag
2017-11-08reduce_heads: fix memory leaksLibravatar Martin Ågren5-5/+11
We currently have seven callers of `reduce_heads(foo)`. Six of them do not use the original list `foo` again, and actually, all six of those end up leaking it. Introduce and use `reduce_heads_replace(&foo)` as a leak-free version of `foo = reduce_heads(foo)` to fix several of these. Fix the remaining leaks using `free_commit_list()`. While we're here, document `reduce_heads()` and mark it as `extern`. Signed-off-by: Martin Ågren <martin.agren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-08builtin/merge-base: free commit listsLibravatar Martin Ågren1-18/+18
In several functions, we iterate through a commit list by assigning `result = result->next`. As a consequence, we lose the original pointer and eventually leak the list. Rewrite the loops so that we keep the original pointers, then call `free_commit_list()`. Various alternatives were considered: 1) Use `UNLEAK(result)` before the loop. Simple change, but not very pretty. These would definitely be new lows among our usages of UNLEAK. 2) Use `pop_commit()` when looping. Slightly less simple change, but it feels slightly preferable to first display the list, then free it. 3) As in this patch, but with `UNLEAK()` instead of freeing. We'd still go through all the trouble of refactoring the loop, and because it's not super-obvious that we're about to exit, let's just free the lists -- it probably doesn't affect the runtime much. In `handle_independent()` we can drop `result` while we're here and reuse the `revs`-variable instead. That matches several other users of `reduce_heads()`. The memory-leak that this hides will be addressed in the next commit. Signed-off-by: Martin Ågren <martin.agren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-08read_index_from(): speed index loading by skipping verification of the entry ↵Libravatar Ben Peart1-0/+1
order There is code in post_read_index_from() to catch out of order entries when reading an index file. This order verification is ~13% of the cost of every call to read_index_from(). Update check_ce_order() so that it skips this verification unless the "verify_ce_order" global variable is set. Teach fsck to force this verification. The effect can be seen using t/perf/p0002-read-cache.sh: Test HEAD HEAD~1 -------------------------------------------------------------------------------------- 0002.1: read_cache/discard_cache 1000 times 0.41(0.04+0.04) 0.50(0.00+0.10) +22.0% Signed-off-by: Ben Peart <benpeart@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-06Merge branch 'mp/push-pushoption-config'Libravatar Junio C Hamano1-5/+21
The "--push-option=<string>" option to "git push" now defaults to a list of strings configured via push.pushOption variable. * mp/push-pushoption-config: builtin/push.c: add push.pushOption config
2017-11-06Merge branch 'jc/check-ref-format-oor'Libravatar Junio C Hamano1-2/+4
"git check-ref-format --branch @{-1}" bit a "BUG()" when run outside a repository for obvious reasons; clarify the documentation and make sure we do not even try to expand the at-mark magic in such a case, but still call the validation logic for branch names. * jc/check-ref-format-oor: check-ref-format doc: --branch validates and expands <branch> check-ref-format --branch: strip refs/heads/ using skip_prefix check-ref-format --branch: do not expand @{...} outside repository
2017-11-06Merge branch 'bc/object-id'Libravatar Junio C Hamano30-179/+179
Conversion from uchar[20] to struct object_id continues. * bc/object-id: (25 commits) refs/files-backend: convert static functions to object_id refs: convert read_raw_ref backends to struct object_id refs: convert peel_object to struct object_id refs: convert resolve_ref_unsafe to struct object_id worktree: convert struct worktree to object_id refs: convert resolve_gitlink_ref to struct object_id Convert remaining callers of resolve_gitlink_ref to object_id sha1_file: convert index_path and index_fd to struct object_id refs: convert reflog_expire parameter to struct object_id refs: convert read_ref_at to struct object_id refs: convert peel_ref to struct object_id builtin/pack-objects: convert to struct object_id pack-bitmap: convert traverse_bitmap_commit_list to object_id refs: convert dwim_log to struct object_id builtin/reflog: convert remaining unsigned char uses to object_id refs: convert dwim_ref and expand_ref to struct object_id refs: convert read_ref and read_ref_full to object_id refs: convert resolve_refdup and refs_resolve_refdup to struct object_id Convert check_connected to use struct object_id refs: update ref transactions to use struct object_id ...
2017-11-06Merge branch 'wk/pull-signoff'Libravatar Junio C Hamano1-0/+6
"git pull" has been taught to accept "--[no-]signoff" option and pass it down to "git merge". * wk/pull-signoff: pull: pass --signoff/--no-signoff to "git merge"
2017-11-06Merge branch 'pc/submodule-helper'Libravatar Junio C Hamano1-17/+256
GSoC. * pc/submodule-helper: submodule: port submodule subcommand 'status' from shell to C submodule--helper: introduce for_each_listed_submodule() submodule--helper: introduce get_submodule_displaypath()
2017-11-06Merge branch 'pb/bisect-helper'Libravatar Junio C Hamano1-6/+131
An early part of piece-by-piece rewrite of "git bisect". * pb/bisect-helper: bisect--helper: `is_expected_rev` & `check_expected_revs` shell function in C t6030: explicitly test for bisection cleanup bisect--helper: `bisect_clean_state` shell function in C bisect--helper: `write_terms` shell function in C bisect--helper: rewrite `check_term_format` shell function in C bisect--helper: use OPT_CMDMODE instead of OPT_BOOL
2017-11-06Merge branch 'bw/grep-recurse-submodules'Libravatar Junio C Hamano1-0/+2
A broken access to object databases in recent update to "git grep --recurse-submodules" has been fixed. * bw/grep-recurse-submodules: grep: take the read-lock when adding a submodule
2017-11-06Merge branch 'ao/check-resolve-ref-unsafe-result'Libravatar Junio C Hamano1-0/+2
"git commit", after making a commit, did not check for errors when asking on what branch it made the commit, which has been correted. * ao/check-resolve-ref-unsafe-result: commit: check result of resolve_ref_unsafe
2017-11-06Merge branch 'jk/misc-resolve-ref-unsafe-fixes'Libravatar Junio C Hamano1-1/+1
Some codepaths did not check for errors when asking what branch the HEAD points at, which have been fixed. * jk/misc-resolve-ref-unsafe-fixes: worktree: handle broken symrefs in find_shared_symref() log: handle broken HEAD in decoration check remote: handle broken symrefs test-ref-store: avoid passing NULL to printf
2017-11-06Merge branch 'jc/no-cmd-as-subroutine'Libravatar Junio C Hamano2-13/+18
Calling cmd_foo() as if it is a general purpose helper function is a no-no. Correct two instances of such to set an example. * jc/no-cmd-as-subroutine: merge-ours: do not use cmd_*() as a subroutine describe: do not use cmd_*() as a subroutine
2017-11-06Merge branch 'ma/lockfile-fixes'Libravatar Junio C Hamano8-45/+33
An earlier update made it possible to use an on-stack in-core lockfile structure (as opposed to having to deliberately leak an on-heap one). Many codepaths have been updated to take advantage of this new facility. * ma/lockfile-fixes: read_cache: roll back lock in `update_index_if_able()` read-cache: leave lock in right state in `write_locked_index()` read-cache: drop explicit `CLOSE_LOCK`-flag cache.h: document `write_locked_index()` apply: remove `newfd` from `struct apply_state` apply: move lockfile into `apply_state` cache-tree: simplify locking logic checkout-index: simplify locking logic tempfile: fix documentation on `delete_tempfile()` lockfile: fix documentation on `close_lock_file_gently()` treewide: prefer lockfiles on the stack sha1_file: do not leak `lock_file`
2017-11-06refs: rename constant `REF_NODEREF` to `REF_NO_DEREF`Libravatar Michael Haggerty8-12/+12
Even after working with this code for years, I still see this constant name as "ref node ref". Rename it to make it's meaning clearer. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-06bisect: change calling-convention of `find_bisection()`Libravatar Martin Ågren1-2/+1
This function takes a commit list and returns a commit list. The returned list is built by modifying the original list. Thus the caller should not use the original list again (and after the next commit fixes a memory leak, it must not). Change the function signature so that it takes a **list and has void return type. That should make it harder to misuse this function. While we're here, document this function. Signed-off-by: Martin Ågren <martin.agren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-11-02grep: take the read-lock when adding a submoduleLibravatar Martin Ågren1-0/+2
With --recurse-submodules, we add each submodule that we encounter to the list of alternate object databases. With threading, our changes to the list are not protected against races. Indeed, ThreadSanitizer reports a race when we call `add_to_alternates_memory()` around the same time that another thread is reading in the list through `read_sha1_file()`. Take the grep read-lock while adding the submodule. The lock is used to serialize uses of non-thread-safe parts of Git's API, including `read_sha1_file()`. Helped-by: Brandon Williams <bmwill@google.com> Signed-off-by: Martin Ågren <martin.agren@gmail.com> Acked-by: Brandon Williams <bmwill@google.com> Reviewed-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>