From aaf633c2ad10b47af7623c130ddfe7231658c7e4 Mon Sep 17 00:00:00 2001 From: Derrick Stolee Date: Tue, 13 Aug 2019 11:37:48 -0700 Subject: [PATCH] repo-settings: create feature.experimental setting The 'feature.experimental' setting includes config options that are not committed to become defaults, but could use additional testing. Update the following config settings to take new defaults, and to use the repo_settings struct if not already using them: * 'pack.useSparse=true' * 'fetch.negotiationAlgorithm=skipping' In the case of fetch.negotiationAlgorithm, the existing logic would load the config option only when about to use the setting, so had a die() statement on an unknown string value. This is removed as now the config is parsed under prepare_repo_settings(). In general, this die() is probably misplaced and not valuable. A test was removed that checked this die() statement executed. Signed-off-by: Derrick Stolee Signed-off-by: Junio C Hamano --- Documentation/config/feature.txt | 14 ++++++++++++++ Documentation/config/fetch.txt | 3 ++- Documentation/config/pack.txt | 3 ++- fetch-negotiator.c | 25 +++++++++++++------------ fetch-negotiator.h | 5 +++-- fetch-pack.c | 11 +++++------ repo-settings.c | 13 +++++++++++++ repository.h | 8 ++++++++ t/t5552-skipping-fetch-negotiator.sh | 23 ----------------------- 9 files changed, 60 insertions(+), 45 deletions(-) diff --git a/Documentation/config/feature.txt b/Documentation/config/feature.txt index 8ea198a642f..545522f306e 100644 --- a/Documentation/config/feature.txt +++ b/Documentation/config/feature.txt @@ -4,6 +4,20 @@ feature.*:: developer community as recommended defaults and are subject to change. In particular, new config options may be added with different defaults. +feature.experimental:: + Enable config options that are new to Git, and are being considered for + future defaults. Config settings included here may be added or removed + with each release, including minor version updates. These settings may + have unintended interactions since they are so new. Please enable this + setting if you are interested in providing feedback on experimental + features. The new default values are: ++ +* `pack.useSparse=true` uses a new algorithm when constructing a pack-file +which can improve `git push` performance in repos with many files. ++ +* `fetch.negotiationAlgorithm=skipping` may improve fetch negotiation times by +skipping more commits at a time, reducing the number of round trips. + feature.manyFiles:: Enable config options that optimize for repos with many files in the working directory. With many files, commands such as `git status` and diff --git a/Documentation/config/fetch.txt b/Documentation/config/fetch.txt index ba890b5884f..d402110638b 100644 --- a/Documentation/config/fetch.txt +++ b/Documentation/config/fetch.txt @@ -59,7 +59,8 @@ fetch.negotiationAlgorithm:: effort to converge faster, but may result in a larger-than-necessary packfile; The default is "default" which instructs Git to use the default algorithm that never skips commits (unless the server has acknowledged it or one - of its descendants). + of its descendants). If `feature.experimental` is enabled, then this + setting defaults to "skipping". Unknown values will cause 'git fetch' to error out. + See also the `--negotiation-tip` option for linkgit:git-fetch[1]. diff --git a/Documentation/config/pack.txt b/Documentation/config/pack.txt index 9cdcfa73247..1d66f0c992c 100644 --- a/Documentation/config/pack.txt +++ b/Documentation/config/pack.txt @@ -112,7 +112,8 @@ pack.useSparse:: objects. This can have significant performance benefits when computing a pack to send a small change. However, it is possible that extra objects are added to the pack-file if the included - commits contain certain types of direct renames. + commits contain certain types of direct renames. Default is `false` + unless `feature.experimental` is enabled. pack.writeBitmaps (deprecated):: This is a deprecated synonym for `repack.writeBitmaps`. diff --git a/fetch-negotiator.c b/fetch-negotiator.c index d6d685cba01..0a1357dc9d5 100644 --- a/fetch-negotiator.c +++ b/fetch-negotiator.c @@ -2,19 +2,20 @@ #include "fetch-negotiator.h" #include "negotiator/default.h" #include "negotiator/skipping.h" +#include "repository.h" -void fetch_negotiator_init(struct fetch_negotiator *negotiator, - const char *algorithm) +void fetch_negotiator_init(struct repository *r, + struct fetch_negotiator *negotiator) { - if (algorithm) { - if (!strcmp(algorithm, "skipping")) { - skipping_negotiator_init(negotiator); - return; - } else if (!strcmp(algorithm, "default")) { - /* Fall through to default initialization */ - } else { - die("unknown fetch negotiation algorithm '%s'", algorithm); - } + prepare_repo_settings(r); + switch(r->settings.fetch_negotiation_algorithm) { + case FETCH_NEGOTIATION_SKIPPING: + skipping_negotiator_init(negotiator); + return; + + case FETCH_NEGOTIATION_DEFAULT: + default: + default_negotiator_init(negotiator); + return; } - default_negotiator_init(negotiator); } diff --git a/fetch-negotiator.h b/fetch-negotiator.h index 9e3967ce662..ea78868504b 100644 --- a/fetch-negotiator.h +++ b/fetch-negotiator.h @@ -2,6 +2,7 @@ #define FETCH_NEGOTIATOR_H struct commit; +struct repository; /* * An object that supplies the information needed to negotiate the contents of @@ -52,7 +53,7 @@ struct fetch_negotiator { void *data; }; -void fetch_negotiator_init(struct fetch_negotiator *negotiator, - const char *algorithm); +void fetch_negotiator_init(struct repository *r, + struct fetch_negotiator *negotiator); #endif diff --git a/fetch-pack.c b/fetch-pack.c index 65be043f2af..d81f47c07b3 100644 --- a/fetch-pack.c +++ b/fetch-pack.c @@ -36,7 +36,6 @@ static int agent_supported; static int server_supports_filtering; static struct lock_file shallow_lock; static const char *alternate_shallow_file; -static char *negotiation_algorithm; static struct strbuf fsck_msg_types = STRBUF_INIT; /* Remember to update object flag allocation in object.h */ @@ -892,12 +891,13 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args, struct shallow_info *si, char **pack_lockfile) { + struct repository *r = the_repository; struct ref *ref = copy_ref_list(orig_ref); struct object_id oid; const char *agent_feature; int agent_len; struct fetch_negotiator negotiator; - fetch_negotiator_init(&negotiator, negotiation_algorithm); + fetch_negotiator_init(r, &negotiator); sort_ref_list(&ref, ref_compare_name); QSORT(sought, nr_sought, cmp_ref_by_name); @@ -911,7 +911,7 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args, if (server_supports("shallow")) print_verbose(args, _("Server supports %s"), "shallow"); - else if (args->depth > 0 || is_repository_shallow(the_repository)) + else if (args->depth > 0 || is_repository_shallow(r)) die(_("Server does not support shallow clients")); if (args->depth > 0 || args->deepen_since || args->deepen_not) args->deepen = 1; @@ -1379,6 +1379,7 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args, struct shallow_info *si, char **pack_lockfile) { + struct repository *r = the_repository; struct ref *ref = copy_ref_list(orig_ref); enum fetch_state state = FETCH_CHECK_LOCAL; struct oidset common = OIDSET_INIT; @@ -1386,7 +1387,7 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args, int in_vain = 0; int haves_to_send = INITIAL_FLUSH; struct fetch_negotiator negotiator; - fetch_negotiator_init(&negotiator, negotiation_algorithm); + fetch_negotiator_init(r, &negotiator); packet_reader_init(&reader, fd[0], NULL, 0, PACKET_READ_CHOMP_NEWLINE | PACKET_READ_DIE_ON_ERR_PACKET); @@ -1505,8 +1506,6 @@ static void fetch_pack_config(void) git_config_get_bool("repack.usedeltabaseoffset", &prefer_ofs_delta); git_config_get_bool("fetch.fsckobjects", &fetch_fsck_objects); git_config_get_bool("transfer.fsckobjects", &transfer_fsck_objects); - git_config_get_string("fetch.negotiationalgorithm", - &negotiation_algorithm); git_config(fetch_pack_config_cb, NULL); } diff --git a/repo-settings.c b/repo-settings.c index d5bf9069f4a..3779b85c175 100644 --- a/repo-settings.c +++ b/repo-settings.c @@ -36,16 +36,29 @@ void prepare_repo_settings(struct repository *r) free(strval); } + if (!repo_config_get_string(r, "fetch.negotiationalgorithm", &strval)) { + if (!strcasecmp(strval, "skipping")) + r->settings.fetch_negotiation_algorithm = FETCH_NEGOTIATION_SKIPPING; + else + r->settings.fetch_negotiation_algorithm = FETCH_NEGOTIATION_DEFAULT; + } + if (!repo_config_get_bool(r, "pack.usesparse", &value)) r->settings.pack_use_sparse = value; if (!repo_config_get_bool(r, "feature.manyfiles", &value) && value) { UPDATE_DEFAULT_BOOL(r->settings.index_version, 4); UPDATE_DEFAULT_BOOL(r->settings.core_untracked_cache, UNTRACKED_CACHE_WRITE); } + if (!repo_config_get_bool(r, "feature.experimental", &value) && value) { + UPDATE_DEFAULT_BOOL(r->settings.pack_use_sparse, 1); + UPDATE_DEFAULT_BOOL(r->settings.fetch_negotiation_algorithm, FETCH_NEGOTIATION_SKIPPING); + } /* Hack for test programs like test-dump-untracked-cache */ if (ignore_untracked_cache_config) r->settings.core_untracked_cache = UNTRACKED_CACHE_KEEP; else UPDATE_DEFAULT_BOOL(r->settings.core_untracked_cache, UNTRACKED_CACHE_KEEP); + + UPDATE_DEFAULT_BOOL(r->settings.fetch_negotiation_algorithm, FETCH_NEGOTIATION_DEFAULT); } diff --git a/repository.h b/repository.h index cf7ff0778c8..4da275e73fa 100644 --- a/repository.h +++ b/repository.h @@ -18,6 +18,13 @@ enum untracked_cache_setting { UNTRACKED_CACHE_WRITE = 2 }; +enum fetch_negotiation_setting { + FETCH_NEGOTIATION_UNSET = -1, + FETCH_NEGOTIATION_NONE = 0, + FETCH_NEGOTIATION_DEFAULT = 1, + FETCH_NEGOTIATION_SKIPPING = 2, +}; + struct repo_settings { int initialized; @@ -28,6 +35,7 @@ struct repo_settings { enum untracked_cache_setting core_untracked_cache; int pack_use_sparse; + enum fetch_negotiation_setting fetch_negotiation_algorithm; }; struct repository { diff --git a/t/t5552-skipping-fetch-negotiator.sh b/t/t5552-skipping-fetch-negotiator.sh index 8a14be51a13..f70cbcc9cab 100755 --- a/t/t5552-skipping-fetch-negotiator.sh +++ b/t/t5552-skipping-fetch-negotiator.sh @@ -60,29 +60,6 @@ test_expect_success 'commits with no parents are sent regardless of skip distanc have_not_sent c6 c4 c3 ' -test_expect_success 'unknown fetch.negotiationAlgorithm values error out' ' - rm -rf server client trace && - git init server && - test_commit -C server to_fetch && - - git init client && - test_commit -C client on_client && - git -C client checkout on_client && - - test_config -C client fetch.negotiationAlgorithm invalid && - test_must_fail git -C client fetch "$(pwd)/server" 2>err && - test_i18ngrep "unknown fetch negotiation algorithm" err && - - # Explicit "default" value - test_config -C client fetch.negotiationAlgorithm default && - git -C client -c fetch.negotiationAlgorithm=default fetch "$(pwd)/server" && - - # Implementation detail: If there is nothing to fetch, we will not error out - test_config -C client fetch.negotiationAlgorithm invalid && - git -C client fetch "$(pwd)/server" 2>err && - test_i18ngrep ! "unknown fetch negotiation algorithm" err -' - test_expect_success 'when two skips collide, favor the larger one' ' rm -rf server client trace && git init server &&