git-lfs-migrate man page

git-lfs-migrate — Migrate history to or from git-lfs

Synopsis

git lfs migrate mode [options] [--] [branch ...]

Modes

Options

-I paths --include=paths

See Include and Exclude.

-X paths --exclude=paths

See Include and Exclude.

--include-ref=refname

See [Include and Exclude (Refs)].

--exclude-ref=refname

See [Include and Exclude (Refs)].

--skip-fetch

Assumes that the known set of remote references is complete, and should not be refreshed when determining the set of "un-pushed" commits to migrate. Has no effect when combined with --include-ref or --exclude-ref.

--everything

See [Include and Exclude (Refs)].

[branch ...]

Migrate only the set of branches listed. If not given, git-lfs-migrate(1) will migrate the currently checked out branch.

References beginning with ´^´ will be excluded, whereas branches that do not begin with ´^´ will be included.

If any of --include-ref or --exclude-ref are given, the checked out branch will not be appended, but branches given explicitly will be appended.

Info

The ´info´ mode has these additional options:

  • --above=<size> Only count files whose individual filesize is above the given size. ´size´ may be specified as a number of bytes, or a number followed by a storage unit, e.g., "1b", "20 MB", "3 TiB", etc.

    If a set of files sharing a common extension has no files in that set whose individual size is above the given --above no files no entry for that set will be shown.

  • --top=<n> Only include the top ´n´ entries, ordered by how many total files match the given pathspec. Default: top 5 entries.
  • --unit=<unit> Format the number of bytes in each entry as a quantity of the storage unit provided. Valid units include:

    * b, kib, mib, gib, tib, pib - for IEC storage units
    * b, kb, mb, gb, tb, pb - for SI storage units

If a --unit is not specified, the largest unit that can fit the number of counted bytes as a whole number quantity is chosen.

Import

The ´import´ mode migrates large objects present in the Git history to pointer files tracked and stored with Git LFS. It supports all the core ´migrate´ options and these additional ones:

  • --verbose Print the commit oid and filename of migrated files to STDOUT.
  • --object-map=<path> Write to ´path´ a file with the mapping of each rewritten commits. The file format is CSV with this pattern: OLD-SHA,NEW-SHA
  • --no-rewrite Migrate large objects to Git LFS in a new commit without rewriting git history. Please note that when this option is used, the migrate import command will expect a different argument list, specialized options will become available, and the core migrate options will be ignored. See [Import (No Rewrite)].
  • --fixup Infer --include and --exclude filters on a per-commit basis based on the .gitattributes files in a repository. In practice, this option imports any filepaths which should be tracked by Git LFS according to the repository´s .gitattributes file(s), but aren´t already pointers. This option is incompatible with explicitly given --include, --exclude filters.

If --no-rewrite is not provided and --include or --exclude (-I, -X, respectively) are given, the .gitattributes will be modified to include any new filepath patterns as given by those flags.

If --no-rewrite is not provided and neither of those flags are given, the gitattributes will be incrementally modified to include new filepath extensions as they are rewritten in history.

Import (No Rewrite)

The import mode has a special sub-mode enabled by the --no-rewrite flag. This sub-mode will migrate large objects to pointers as in the base import mode, but will do so in a new commit without rewriting Git history. When using this sub-mode, the base migrate options, such as --include-ref, will be ignored, as will those for the base import mode. The migrate command will also take a different argument list. As a result of these changes, --no-rewrite will only operate on the current branch - any other interested branches must have the generated commit merged in.

The --no-rewrite sub-mode supports the following options and arguments:

  • -m <message> --message=<message> Specifies a commit message for the newly created commit.
  • [file ...] The list of files to import. These files must be tracked by patterns specified in the gitattributes.

If --message is given, the new commit will be created with the provided message. If no message is given, a commit message will be generated based on the file arguments.

Export

The ´export´ mode migrates Git LFS pointer files present in the Git history out of Git LFS, converting them into their corresponding object files. It supports all the core ´migrate´ options and these additional ones:

  • --verbose Print the commit oid and filename of migrated files to STDOUT.
  • --object-map=<path> Write to ´path´ a file with the mapping of each rewritten commit. The file format is CSV with this pattern: OLD-SHA,NEW-SHA
  • --remote=<git-remote> Download LFS objects from the provided ´git-remote´ during the export. If not provided, defaults to ´origin´.

The ´export´ mode requires at minimum a pattern provided with the --include argument to specify which files to export. Files matching the --include patterns will be removed from Git LFS, while files matching the --exclude patterns will retain their Git LFS status. The export command will modify the .gitattributes to set/unset any filepath patterns as given by those flags.

Include and Exclude

You can configure Git LFS to only migrate tree entries whose pathspec matches the include glob and does not match the exclude glob, to reduce total migration time or to only migrate part of your repo. Specify multiple patterns using the comma as the delimiter.

Pattern matching is done as given to be functionally equivalent to pattern matching as in .gitattributes.

Include and Exclude (Refs)

You can configure Git LFS to only migrate commits reachable by references include by --include-ref and not reachable by --exclude-ref.

        D---E---F
       /         \
  A---B------C    refs/heads/my-feature
   \          \
    \          refs/heads/master
     \
      refs/remotes/origin/master

In the above configuration, the following commits are reachable by each ref:

refs/heads/master:         C, B, A
refs/heads/my-feature:     F, E, D, B, A
refs/remote/origin/master: A

The following configuration:

  --include-ref=refs/heads/my-feature
  --include-ref=refs/heads/master
  --exclude-ref=refs/remotes/origin/master

Would, therefore, include commits: F, E, D, C, B, but exclude commit A.

The presence of flag --everything indicates that all local and remote references should be migrated.

Examples

Migrate unpushed commits

The migrate command´s most common use case is to convert large git objects to LFS before pushing your commits. By default, it only scans commits that don´t exist on any remote, so long as the repository is non-bare.

First, run git lfs migrate info to list the file types taking up the most space in your repository.

$ git lfs migrate info
migrate: Fetching remote refs: ..., done
migrate: Sorting commits: ..., done
migrate: Examining commits: 100% (1/1), done
*.mp3   284 MB    1/1 files(s)  100%
*.pdf   42 MB     8/8 files(s)  100%
*.psd   9.8 MB  15/15 files(s)  100%
*.ipynb 6.9 MB    6/6 files(s)  100%
*.csv   5.8 MB    2/2 files(s)  100%

Now, you can run git lfs migrate import to convert some file types to LFS:

$ git lfs migrate import --include="*.mp3,*.psd"
migrate: Fetching remote refs: ..., done
migrate: Sorting commits: ..., done
migrate: Rewriting commits: 100% (1/1), done
  master    d2b959babd099fe70da1c1512e2475e8a24de163 -> 136e706bf1ae79643915c134e17a6c933fd53c61
migrate: Updating refs: ..., done

Migrate local history

You can also migrate the entire history of your repository:

# Check for large files in your local master branch
$ git lfs migrate info --include-ref=master

# Check for large files in every branch
$ git lfs migrate info --everything

The same flags will work in import mode:

# Convert all zip files in your master branch
$ git lfs migrate import --include-ref=master --include="*.zip"

# Convert all zip files in every local branch
$ git lfs migrate import --everything --include="*.zip"

Note: This will require a force push to any existing Git remotes.

Migrate without rewriting local history

You can also migrate files without modifying the existing history of your repository. Note that in the examples below, files in subdirectories are not included because they are not explicitly specified.

Without a specified commit message:

$ git lfs migrate import --no-rewrite test.zip *.mp3 *.psd

With a specified commit message:

$ git lfs migrate import --no-rewrite \
  -m "Import test.zip, .mp3, .psd files in root of repo" \
  test.zip *.mp3 *.psd

See Also

Part of the git-lfs(1) suite.

Referenced By

git-lfs(1).

April 2019