Git subdirectory filter with existing directory structure

I’m splitting out a Git repository using the –subdirectory-filter option of filter-branch which is working great except it pulls everything up to the root of the repository.

I currently have

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  • ABC
      - DEF
          - GHI
          - JKL
      - MNO
    

    And the result of this command:

    git filter-branch -f --subdirectory-filter ABC/DEF --prune-empty -- --all
    

    Generates this:

    GHI
    JKL
    

    Where what I really want is this:

    ABC
      - DEF
          - GHI
          - JKL
    

    I can’t see anything in the Git docs that shows a filter option which preserves (or sets) the directory structure and I haven’t been able to find a command I can run after the filtering to remap the structure to how I want it.

    Is this possible?

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  • 2 Solutions collect form web for “Git subdirectory filter with existing directory structure”

    I found an answer here which does the trick.

    The command:

    git filter-branch -f --index-filter 'git ls-files -s \
    | sed "s-\t-&ABC/DEF/-" \
    | GIT_INDEX_FILE=$GIT_INDEX_FILE.new git update-index --index-info \
    && mv $GIT_INDEX_FILE.new $GIT_INDEX_FILE'
    

    works perfectly

    I’ve only given this cursory testing myself, but I think you can use git filter-branch with --tree-filter to rewrite the branch, but removing all files apart from those in the subdirectory ABC/DEF, with something like the following:

    git filter-branch --tree-filter \
        'find . -path ./ABC/DEF -prune -o -type f -print0 | xargs -0 rm -f' \
        --prune-empty HEAD
    

    Note that the find command only removes files, not directories, but since git doesn’t store empty directories, this should still produce the result you want.

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