github - What is the storage mechanism behind Git Large File Storage? -

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github - What is the storage mechanism behind Git Large File Storage? -

github introduced extension git storing big files in different way. mean extension replaces big files text pointers within git ?

you can see in git-lfs sources how "text pointer" defined:

type pointer struct { version string oid string size int64 oidtype string }

the smudge , clean sources means git-lfs can utilize content filter driver in order to:

download actual files on checkout store them in external source on commit.

see the pointer specs:

the core git lfs thought instead of writing big blobs git repository, pointer file written.

version https://git-lfs.github.com/spec/v1 oid sha256:4d7a214614ab2935c943f9e0ff69d22eadbb8f32b1258daaa5e2ca24d17e2393 size 12345 (ending \n)

git lfs needs url endpoint talk remote server. git repository can have different git lfs endpoints different remotes.

the actual file upload or downloaded server respect git-lfs api.

this confirmed git-lfs man page, mentions:

the actual file gets pushed git lfs api

you need git server implements api in order back upwards uploading , downloading binary content.

regarding content filter driver (which exists in git long time, before lfs, , used here lfs add together "large file management" feature), mass of work happens:

the smudge filter runs files beingness checked out git repository working directory. git sends content of git blob stdin, , expects content write working directory stdout.

read 100 bytes.

if content ascii , matches pointer file format: file in .git/lfs/objects/{oid}.

if it's not there, download server. read contents stdout

otherwise, pass stdin out through stdout.

the clean filter runs files added repositories. git sends content of file beingness added stdin, , expects content write git stdout.

stream binary content stdin temp file, while calculating sha-256 signature. check file @ .git/lfs/objects/{oid}. if not exist: queue oid uploaded. move temp file .git/lfs/objects/{oid}. delete temp file. write pointer file stdout.

git github

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