diff options
| -rw-r--r-- | Documentation/config/core.txt | 40 | ||||
| -rw-r--r-- | cache.h | 23 | ||||
| -rw-r--r-- | config.c | 5 |
3 files changed, 65 insertions, 3 deletions
diff --git a/Documentation/config/core.txt b/Documentation/config/core.txt index ab911d6e26..9a3ad71e9e 100644 --- a/Documentation/config/core.txt +++ b/Documentation/config/core.txt @@ -547,6 +547,46 @@ core.whitespace:: is relevant for `indent-with-non-tab` and when Git fixes `tab-in-indent` errors. The default tab width is 8. Allowed values are 1 to 63. +core.fsync:: + A comma-separated list of components of the repository that + should be hardened via the core.fsyncMethod when created or + modified. You can disable hardening of any component by + prefixing it with a '-'. Items that are not hardened may be + lost in the event of an unclean system shutdown. Unless you + have special requirements, it is recommended that you leave + this option empty or pick one of `committed`, `added`, + or `all`. ++ +When this configuration is encountered, the set of components starts with +the platform default value, disabled components are removed, and additional +components are added. `none` resets the state so that the platform default +is ignored. ++ +The empty string resets the fsync configuration to the platform +default. The default on most platforms is equivalent to +`core.fsync=committed,-loose-object`, which has good performance, +but risks losing recent work in the event of an unclean system shutdown. ++ +* `none` clears the set of fsynced components. +* `loose-object` hardens objects added to the repo in loose-object form. +* `pack` hardens objects added to the repo in packfile form. +* `pack-metadata` hardens packfile bitmaps and indexes. +* `commit-graph` hardens the commit graph file. +* `index` hardens the index when it is modified. +* `objects` is an aggregate option that is equivalent to + `loose-object,pack`. +* `derived-metadata` is an aggregate option that is equivalent to + `pack-metadata,commit-graph`. +* `committed` is an aggregate option that is currently equivalent to + `objects`. This mode sacrifices some performance to ensure that work + that is committed to the repository with `git commit` or similar commands + is hardened. +* `added` is an aggregate option that is currently equivalent to + `committed,index`. This mode sacrifices additional performance to + ensure that the results of commands like `git add` and similar operations + are hardened. +* `all` is an aggregate option that syncs all individual components above. + core.fsyncMethod:: A value indicating the strategy Git will use to harden repository data using fsync and related primitives. @@ -1007,9 +1007,26 @@ enum fsync_component { FSYNC_COMPONENT_INDEX = 1 << 4, }; -#define FSYNC_COMPONENTS_DEFAULT (FSYNC_COMPONENT_PACK | \ - FSYNC_COMPONENT_PACK_METADATA | \ - FSYNC_COMPONENT_COMMIT_GRAPH) +#define FSYNC_COMPONENTS_OBJECTS (FSYNC_COMPONENT_LOOSE_OBJECT | \ + FSYNC_COMPONENT_PACK) + +#define FSYNC_COMPONENTS_DERIVED_METADATA (FSYNC_COMPONENT_PACK_METADATA | \ + FSYNC_COMPONENT_COMMIT_GRAPH) + +#define FSYNC_COMPONENTS_DEFAULT (FSYNC_COMPONENTS_OBJECTS | \ + FSYNC_COMPONENTS_DERIVED_METADATA | \ + ~FSYNC_COMPONENT_LOOSE_OBJECT) + +#define FSYNC_COMPONENTS_COMMITTED (FSYNC_COMPONENTS_OBJECTS) + +#define FSYNC_COMPONENTS_ADDED (FSYNC_COMPONENTS_COMMITTED | \ + FSYNC_COMPONENT_INDEX) + +#define FSYNC_COMPONENTS_ALL (FSYNC_COMPONENT_LOOSE_OBJECT | \ + FSYNC_COMPONENT_PACK | \ + FSYNC_COMPONENT_PACK_METADATA | \ + FSYNC_COMPONENT_COMMIT_GRAPH | \ + FSYNC_COMPONENT_INDEX) /* * A bitmask indicating which components of the repo should be fsynced. @@ -1332,6 +1332,11 @@ static const struct fsync_component_name { { "pack-metadata", FSYNC_COMPONENT_PACK_METADATA }, { "commit-graph", FSYNC_COMPONENT_COMMIT_GRAPH }, { "index", FSYNC_COMPONENT_INDEX }, + { "objects", FSYNC_COMPONENTS_OBJECTS }, + { "derived-metadata", FSYNC_COMPONENTS_DERIVED_METADATA }, + { "committed", FSYNC_COMPONENTS_COMMITTED }, + { "added", FSYNC_COMPONENTS_ADDED }, + { "all", FSYNC_COMPONENTS_ALL }, }; static enum fsync_component parse_fsync_components(const char *var, const char *string) |