JGit configuration options

Legend

git option	description
✅	option defined by native git
⃞	jgit custom option not supported by native git

core options

option	default	git option	description
core.attributesFile		✅	In addition to .gitattributes (per-directory) and .git/info/attributes, Git looks into this file for attributes . Path expansions are made the same way as for core.excludesFile.
core.autocrlf	false	✅	Setting this variable to true is the same as setting the text attribute to auto on all files and core.eol to crlf. Set to true if you want to have CRLF line endings in your working directory and the repository has LF line endings. This variable can be set to input, in which case no output conversion is performed.
core.bare	set automatically on init or clone	✅	If true this repository is assumed to be bare and has no working directory associated with it. If this is the case a number of commands that require a working directory will be disabled
core.bigFileThreshold	50 MiB	✅	Files larger than this size are stored deflated, without attempting delta compression. Storing large files without delta compression avoids excessive memory usage, at the slight expense of increased disk usage. Additionally files larger than this size are always treated as binary.
core.checkstat		✅	When missing or is set to default, many fields in the stat structure are checked to detect if a file has been modified since Git looked at it. Checks as much of the dircache stat info as possible (in JGit limited by Java filesystem API). When set to minimum only checks the size and whole second part of time stamp when comparing the stat info in the dircache with actual file stat info.
core.compression	-1 (zlib default)	✅	An integer -1..9, indicating a default compression level. -1 is the zlib default. 0 means no compression, and 1..9 are various speed/size tradeoffs, 9 being slowest.
core.deltaBaseCacheLimit	10 MiB	✅	Maximum number of bytes to reserve for caching base objects that multiple deltafied objects reference. By storing the entire decompressed base object in a cache Git is able to avoid unpacking and decompressing frequently used base objects multiple times.
core.dfs.blockLimit	30 MiB	⃞	Maximum number bytes of heap memory to dedicate to caching pack file data in DFS block cache.
core.dfs.blockSize	64 kiB	⃞	Size in bytes of a single window read in from the pack file into the DFS block cache.
core.dfs.concurrencyLevel	32	⃞	The estimated number of threads concurrently accessing the DFS block cache.
core.dfs.deltaBaseCacheLimit	10 MiB	⃞	Maximum number of bytes to hold in per-reader DFS delta base cache.
core.dfs.streamFileThreshold	50 MiB	⃞	The size threshold beyond which objects must be streamed.
core.dfs.streamBuffer	Block size of the pack	⃞	Number of bytes to use for buffering when streaming a pack file during copying. If 0 the block size of the pack is used
core.dfs.streamRatio	0.30	⃞	Ratio of DFS block cache to occupy with a copied pack. Values between 0 and 1.0.
core.dirNoGitLinks	false	⃞	If set to true avoid checking for submodules. See bug 436200.
core.eol	native	✅	Sets the line ending type to use in the working directory for files that are marked as text (either by having the text attribute set, or by having text=auto and Git auto-detecting the contents as text). Alternatives are lf, crlf and native, which uses the platform’s native line ending.
core.excludesFile		✅	Specifies the pathname to the file that contains patterns to describe paths that are not meant to be tracked, in addition to .gitignore (per-directory) and .git/info/exclude.
core.fileMode	Auto detects if file modes are supported	✅	Tells Git if the executable bit of files in the working tree is to be honored.
core.hideDotFiles	dotGitOnly	✅	Windows only. If true, mark newly-created directories and files whose name starts with a dot as hidden. If dotGitOnly, only the .git/ directory is hidden, but no other files starting with a dot.
core.hooksPath	$GIT_DIR/hooks	✅	Path to look for hooks.
core.logAllRefUpdates	true in a repository with working tree, false in bare repository	✅	Enable the reflog.
core.packedGitLimit	10 MiB	✅	Maximum number of bytes to cache in memory from pack files.
core.packedGitMmap	false	✅	Whether to use Java NIO virtual memory mapping for JGit buffer cache. When set to true enables use of Java NIO virtual memory mapping for cache windows, false reads entire window into a byte[] with standard read calls. true is experimental and may cause instabilities and crashes since Java doesn't support explicit unmapping of file regions mapped to virtual memory.
core.packedGitOpenFiles	128	⃞	Maximum number of streams to open at a time. Open packs count against the process limits.
core.packedGitUseStrongRefs	false	⃞	Whether the window cache should use strong references (true) or SoftReferences (false). When false the JVM will drop data cached in the JGit block cache when heap usage comes close to the maximum heap size.
core.packedGitWindowSize	8 kiB	✅	Number of bytes of a pack file to load into memory in a single read operation. This is the “page size” of the JGit buffer cache, used for all pack access operations. All disk IO occurs as single window reads. Setting this too large may cause the process to load more data than is required; setting this too small may increase the frequency of read() system calls.
core.precomposeUnicode	true on Mac OS	✅	MacOS only. When true, JGit reverts the unicode decomposition of filenames done by Mac OS.
core.quotePath	true	✅	Commands that output paths (e.g. ls-files, diff), will quote “unusual” characters in the pathname by enclosing the pathname in double-quotes and escaping those characters with backslashes in the same way C escapes control characters (e.g. \t for TAB, \n for LF, \\ for backslash) or bytes with values larger than 0x80 (e.g. octal \302\265 for “micro” in UTF-8).
core.repositoryFormatVersion	1	⃞	Internal version identifying the repository format and layout version. Don't set manually.
core.streamFileThreshold	50 MiB	⃞	The size threshold beyond which objects must be streamed.
core.supportsAtomicFileCreation	true	⃞	Whether the filesystem supports atomic file creation.
core.symlinks	Auto detect if filesystem supports symlinks	✅	If false, symbolic links are checked out as small plain files that contain the link text.
core.trustFolderStat	true	⃞	Whether to trust the pack folder's modification time. If false JGit will always scan the .git/objects/pack folder to check for new pack files. This can help to workaround caching issues on NFS, but reduces performance. If set to true it uses the lastmodified attribute of the folder and assumes that no new pack files can be in this folder if its modification time has not changed.
core.worktree	Root directory of the working tree if it is not the parent directory of the .git directory	✅	The path to the root of the working tree.

gc options

option	default	git option	description
gc.aggressiveDepth	50	✅	The depth parameter used in the delta compression algorithm used by aggressive garbage collection.
gc.aggressiveWindow	250	✅	The window size parameter used in the delta compression algorithm used by aggressive garbage collection.
gc.auto	6700	✅	Number of loose objects until auto gc combines all loose objects into a pack and consolidates all existing packs into one. Setting to 0 disables automatic packing of loose objects.
gc.autoDetach	true	✅	Make auto gc return immediately and run in background.
gc.autoPackLimit	50	✅	Number of packs until auto gc consolidates existing packs (except those marked with a .keep file) into a single pack. Setting gc.autoPackLimit to 0 disables automatic consolidation of packs.
gc.logExpiry	1.day.ago	✅	If the file gc.log exists, then auto gc will print its content and exit successfully instead of running unless that file is more than gc.logExpiry old.
gc.pruneExpire	2.weeks.ago	✅	Grace period after which unreachable objects will be pruned.
gc.prunePackExpire	1.hour.ago	⃞	Grace period after which packfiles only containing unreachable objects will be pruned.

pack options

option	default	git option	description
pack.bitmapContiguousCommitCount	100	⃞	Count of most recent commits for which to build bitmaps.
pack.bitmapDistantCommitSpan	5000	⃞	Span of commits when building bitmaps for distant history.
pack.bitmapExcessiveBranchCount	100	⃞	The count of branches deemed “excessive”. If the count of branches in a repository exceeds this number and bitmaps are enabled, “inactive” branches will have fewer bitmaps than “active” branches.
pack.bitmapInactiveBranchAgeInDays	90	⃞	Age in days that marks a branch as “inactive” for bitmap creation.
pack.bitmapRecentCommitCount	20000	⃞	Count at which to switch from bitmapRecentCommitSpan to bitmapDistantCommitSpan.
pack.bitmapRecentCommitSpan	100	⃞	Span of commits when building bitmaps for recent history.
pack.buildBitmaps	true	⃞ synonym for repack.writeBitmaps	Whether index writer is allowed to build bitmaps for indexes.
pack.compression	core.compression	✅	Compression level applied to objects in the pack.
pack.cutDeltaChains	false	⃞	Whether existing delta chains should be cut at {@link #getMaxDeltaDepth()
pack.deltaCacheLimit	100	✅	Maximum size in bytes of a delta to cache.
pack.deltaCacheSize	50 MiB	✅	Size of the in-memory delta cache.
pack.deltaCompression	true	⃞	Whether the writer will create new deltas on the fly. true if the pack writer will create a new delta when either pack.reuseDeltas is false, or no suitable delta is available for reuse.
pack.depth	50	✅	Maximum depth of delta chain set up for the pack writer.
pack.indexVersion	2	✅	Pack index file format version.
pack.minSizePreventRacyPack	100 MiB	⃞	Minimum packfile size for which we wait before opening a newly written pack to prevent its lastModified timestamp could be racy if pack.waitPreventRacyPack is true.
pack.preserveOldPacks	false	⃞	Whether to preserve old packs in a preserved directory.
prunePreserved, only via API of PackConfig	false	⃞	Whether to remove preserved pack files in a preserved directory.
pack.reuseDeltas	true	⃞	Whether to reuse deltas existing in repository.
pack.reuseObjects	true	⃞	Whether to reuse existing objects representation in repository.
pack.singlePack	false	⃞	Whether all of refs/* should be packed in a single pack.
pack.threads	0 (auto-detect number of processors)	✅	Number of threads to use for delta compression.
pack.waitPreventRacyPack	false	⃞	Whether we wait before opening a newly written pack to prevent its lastModified timestamp could be racy.
pack.window	10	✅	Number of objects to try when looking for a delta base per thread searching for deltas.
pack.windowMemory	0 (unlimited)	✅	Maximum number of bytes to put into the delta search window.