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Taylor Blau 9218c6a40c midx: allow marking a pack as preferred 
When multiple packs in the multi-pack index contain the same object, the
MIDX machinery must make a choice about which pack it associates with
that object. Prior to this patch, the lowest-ordered[1] pack was always
selected.

Pack selection for duplicate objects is relatively unimportant today,
but it will become important for multi-pack bitmaps. This is because we
can only invoke the pack-reuse mechanism when all of the bits for reused
objects come from the reuse pack (in order to ensure that all reused
deltas can find their base objects in the same pack).

To encourage the pack selection process to prefer one pack over another
(the pack to be preferred is the one a caller would like to later use as
a reuse pack), introduce the concept of a "preferred pack". When
provided, the MIDX code will always prefer an object found in a
preferred pack over any other.

No format changes are required to store the preferred pack, since it
will be able to be inferred with a corresponding MIDX bitmap, by looking
up the pack associated with the object in the first bit position (this
ordering is described in detail in a subsequent commit).

[1]: the ordering is specified by MIDX internals; for our purposes we
can consider the "lowest ordered" pack to be "the one with the
most-recent mtime.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-04-01 13:07:37 -07:00
..
add.c drop unused argc parameters 2020-09-30 12:53:47 -07:00
am.c builtin/*: update usage format 2021-01-06 15:10:49 -08:00
annotate.c strvec: rename struct fields 2020-07-30 19:18:06 -07:00
apply.c apply.c: make init_apply_state() take a struct repository 2018-08-13 14:14:44 -07:00
archive.c pack-protocol.txt: accept error packets in any context 2019-01-02 13:05:30 -08:00
bisect--helper.c bisect--helper: retire --check-and-set-terms subcommand 2021-02-03 14:52:09 -08:00
blame.c Merge branch 'ab/mailmap' 2021-01-25 14:19:19 -08:00
branch.c Merge branch 'ph/use-delete-refs' 2021-02-05 16:40:45 -08:00
bugreport.c builtin/bugreport.c: use thread-safe localtime_r() 2020-12-01 13:05:37 -08:00
bundle.c Merge branch 'bc/sha-256-part-3' 2020-08-11 18:04:11 -07:00
cat-file.c Merge branch 'cc/cat-file-usage-update' into master 2020-07-09 14:00:41 -07:00
check-attr.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
check-ignore.c dir: fix problematic API to avoid memory leaks 2020-08-18 17:17:31 -07:00
check-mailmap.c shortlog: remove unused(?) "repo-abbrev" feature 2021-01-12 14:04:42 -08:00
check-ref-format.c
checkout-index.c checkout-index: propagate errors to exit code 2020-10-27 12:41:56 -07:00
checkout.c cache-tree: clean up cache_tree_update() 2021-01-23 17:14:07 -08:00
clean.c quote_path: give flags parameter to quote_path() 2020-09-10 10:49:19 -07:00
clone.c Merge branch 'jt/clone-unborn-head' 2021-02-17 17:21:40 -08:00
column.c builtin: consistently pass cmd_* prefix to parse_options 2019-05-13 14:22:53 +09:00
commit-graph.c builtin/*: update usage format 2021-01-06 15:10:49 -08:00
commit-tree.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
commit.c shortlog: remove unused(?) "repo-abbrev" feature 2021-01-12 14:04:42 -08:00
config.c config: implement --fixed-value with --get* 2020-11-25 14:43:48 -08:00
count-objects.c rename "alternate_object_database" to "object_directory" 2018-11-13 14:22:02 +09:00
credential-cache--daemon.c make credential helpers builtins 2020-08-13 11:02:08 -07:00
credential-cache.c Merge branch 'jc/undash-in-tree-git-callers' 2020-09-03 12:37:03 -07:00
credential-store.c crendential-store: use timeout when locking file 2020-11-25 12:30:18 -08:00
credential.c credential: load default config 2020-10-16 12:30:45 -07:00
describe.c refs: switch peel_ref() to peel_iterated_oid() 2021-01-21 15:51:31 -08:00
diff-files.c Merge branch 'tb/precompose-prefix-too' 2021-02-12 14:21:04 -08:00
diff-index.c MacOS: precompose_argv_prefix() 2021-02-03 14:09:37 -08:00
diff-tree.c MacOS: precompose_argv_prefix() 2021-02-03 14:09:37 -08:00
diff.c Merge branch 'tb/precompose-prefix-too' 2021-02-12 14:21:04 -08:00
difftool.c Use new HASHMAP_INIT macro to simplify hashmap initialization 2020-11-11 12:55:27 -08:00
env--helper.c assert PARSE_OPT_NONEG in parse-options callbacks 2020-09-30 12:53:47 -07:00
fast-export.c builtin/*: update usage format 2021-01-06 15:10:49 -08:00
fast-import.c Merge branch 'jk/fast-import-marks-cleanup' 2020-11-02 13:17:40 -08:00
fetch-pack.c connect, transport: encapsulate arg in struct 2021-02-05 13:49:54 -08:00
fetch.c Merge branch 'jt/clone-unborn-head' 2021-02-17 17:21:40 -08:00
fmt-merge-msg.c Lib-ify fmt-merge-msg 2020-03-24 15:04:43 -07:00
for-each-ref.c ref-filter: move ref_sorting flags to a bitfield 2021-01-07 15:13:21 -08:00
for-each-repo.c for-each-repo: do nothing on empty config 2021-01-07 19:12:02 -08:00
fsck.c fsck: make fsck_config() re-usable 2021-01-05 14:58:29 -08:00
gc.c maintenance: incremental strategy runs pack-refs weekly 2021-02-09 23:09:29 -08:00
get-tar-commit-id.c builtin/get-tar-commit-id: make hash size independent 2019-04-01 11:57:39 +09:00
grep.c Merge branch 'mt/grep-cached-untracked' 2021-02-17 17:21:41 -08:00
hash-object.c builtin: consistently pass cmd_* prefix to parse_options 2019-05-13 14:22:53 +09:00
help.c help: drop usage of 'common' and 'useful' for guides 2020-08-04 18:34:01 -07:00
index-pack.c t: support GIT_TEST_WRITE_REV_INDEX 2021-01-25 18:32:44 -08:00
init-db.c get_default_branch_name(): prepare for showing some advice 2020-12-13 15:53:50 -08:00
interpret-trailers.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
log.c Merge branch 'ab/diff-deferred-free' 2021-02-22 16:12:43 -08:00
ls-files.c ls-files.c: add --deduplicate option 2021-01-23 11:48:20 -08:00
ls-remote.c connect, transport: encapsulate arg in struct 2021-02-05 13:49:54 -08:00
ls-tree.c Merge branch 'nd/attr-pathspec-in-tree-walk' 2019-01-14 15:29:28 -08:00
mailinfo.c
mailsplit.c
merge-base.c rebase: --fork-point regression fix 2020-02-11 09:59:39 -08:00
merge-file.c assert NOARG/NONEG behavior of parse-options callbacks 2018-11-06 12:56:29 +09:00
merge-index.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
merge-ours.c cache.h: flip NO_THE_INDEX_COMPATIBILITY_MACROS switch 2019-01-24 11:55:06 -08:00
merge-recursive.c Ensure index matches head before invoking merge machinery, round N 2019-08-19 10:08:03 -07:00
merge-tree.c merge-base, xdiff: zero out xpparam_t structures 2020-10-20 12:53:26 -07:00
merge.c Merge branch 'so/log-diff-merge' 2021-02-05 16:40:44 -08:00
mktag.c mktag: add a --[no-]strict option 2021-01-06 14:22:24 -08:00
mktree.c mktree: drop unused length parameter 2019-05-13 14:22:54 +09:00
multi-pack-index.c midx: allow marking a pack as preferred 2021-04-01 13:07:37 -07:00
mv.c git-mv: improve error message for conflicted file 2020-07-20 14:35:43 -07:00
name-rev.c oid_pos(): access table through const pointers 2021-01-28 12:03:26 -08:00
notes.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
pack-objects.c Merge branch 'tb/pack-revindex-on-disk' 2021-02-12 14:21:04 -08:00
pack-redundant.c Merge branch 'jc/deprecate-pack-redundant' 2021-01-25 14:19:18 -08:00
pack-refs.c Honor core.precomposeUnicode in more places 2019-04-26 10:54:03 +09:00
patch-id.c patch-id: use oid_to_hex() to print multiple object IDs 2019-12-09 12:26:40 -08:00
prune-packed.c Lib-ify prune-packed 2020-03-24 15:04:44 -07:00
prune.c Merge branch 'tb/shallow-cleanup' 2020-05-13 12:19:18 -07:00
pull.c pull: display default warning only when non-ff 2020-12-15 17:39:42 -08:00
push.c Merge branch 'sk/force-if-includes' 2020-10-27 15:09:49 -07:00
range-diff.c Merge branch 'js/range-diff-one-side-only' 2021-02-17 17:21:41 -08:00
read-tree.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
rebase.c Merge branch 'rs/rebase-commit-validation' into maint 2021-02-05 16:31:22 -08:00
receive-pack.c gpg-interface: improve interface for parsing tags 2021-02-10 23:35:42 -08:00
reflog.c reflog expire --stale-fix: be generous about missing objects 2021-02-11 09:21:52 -08:00
remote-ext.c strvec: convert builtin/ callers away from argv_array name 2020-07-28 15:02:18 -07:00
remote-fd.c
remote.c config: convert multi_replace to flags 2020-11-25 14:43:47 -08:00
repack.c midx: allow marking a pack as preferred 2021-04-01 13:07:37 -07:00
replace.c strvec: rename struct fields 2020-07-30 19:18:06 -07:00
rerere.c Merge branch 'nd/the-index' into md/list-objects-filter-by-depth 2019-01-15 15:38:29 -08:00
reset.c wt-status: tolerate dangling marks 2020-09-02 14:39:25 -07:00
rev-list.c bisect: combine args passed to find_bisection() 2020-08-07 15:13:03 -07:00
rev-parse.c rev-parse: add option for absolute or relative path formatting 2020-12-12 23:35:51 -08:00
revert.c Merge branch 'en/merge-ort-api-null-impl' 2020-11-18 13:32:53 -08:00
rm.c rm: support the --pathspec-from-file option 2020-02-19 10:56:49 -08:00
send-pack.c push: parse and set flag for "--force-if-includes" 2020-10-03 09:59:19 -07:00
shortlog.c Merge branch 'ab/mailmap' 2021-01-25 14:19:19 -08:00
show-branch.c Merge branch 'jt/interpret-branch-name-fallback' 2020-09-09 13:53:09 -07:00
show-index.c builtin/show-index: provide options to determine hash algo 2020-05-27 10:07:07 -07:00
show-ref.c refs: switch peel_ref() to peel_iterated_oid() 2021-01-21 15:51:31 -08:00
sparse-checkout.c sparse-checkout: load sparse-checkout patterns 2021-01-23 17:14:07 -08:00
stash.c stash: declare ref_stash as an array 2021-02-11 13:34:58 -08:00
stripspace.c stripspace: allow -s/-c outside git repository 2018-12-26 15:41:47 -08:00
submodule--helper.c Merge branch 'tb/precompose-prefix-too' 2021-02-12 14:21:04 -08:00
symbolic-ref.c
tag.c Merge branch 'bc/signed-objects-with-both-hashes' 2021-02-22 16:12:42 -08:00
unpack-file.c
unpack-objects.c sha1-file: pass git_hash_algo to hash_object_file() 2020-01-31 10:45:39 -08:00
update-index.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
update-ref.c update-ref: disallow "start" for ongoing transactions 2020-11-16 13:44:01 -08:00
update-server-info.c
upload-archive.c strvec: rename struct fields 2020-07-30 19:18:06 -07:00
upload-pack.c builtin: consistently pass cmd_* prefix to parse_options 2019-05-13 14:22:53 +09:00
var.c
verify-commit.c Merge branch 'jk/no-system-includes-in-dot-c' 2019-07-31 14:38:56 -07:00
verify-pack.c Merge branch 'bc/sha-256-part-3' 2020-08-11 18:04:11 -07:00
verify-tag.c verify-tag: drop signal.h include 2019-06-19 08:19:21 -07:00
worktree.c worktree: teach list verbose mode 2021-01-30 09:57:40 -08:00
write-tree.c cmd_{read,write}_tree: rename "unused" variable that is used 2019-05-13 14:22:53 +09:00