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git/Documentation/git-sparse-checkout.txt
Derrick Stolee f6039a9423 sparse-checkout: 'set' subcommand
The 'git sparse-checkout set' subcommand takes a list of patterns
as arguments and writes them to the sparse-checkout file. Then, it
updates the working directory using 'git read-tree -mu HEAD'.

The 'set' subcommand will replace the entire contents of the
sparse-checkout file. The write_patterns_and_update() method is
extracted from cmd_sparse_checkout() to make it easier to implement
'add' and/or 'remove' subcommands in the future.

If the core.sparseCheckout config setting is disabled, then enable
the config setting in the worktree config. If we set the config
this way and the sparse-checkout fails, then re-disable the config
setting.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-11-22 16:11:43 +09:00

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git-sparse-checkout(1)
======================
NAME
----
git-sparse-checkout - Initialize and modify the sparse-checkout
configuration, which reduces the checkout to a set of paths
given by a list of atterns.
SYNOPSIS
--------
[verse]
'git sparse-checkout <subcommand> [options]'
DESCRIPTION
-----------
Initialize and modify the sparse-checkout configuration, which reduces
the checkout to a set of paths given by a list of patterns.
THIS COMMAND IS EXPERIMENTAL. ITS BEHAVIOR, AND THE BEHAVIOR OF OTHER
COMMANDS IN THE PRESENCE OF SPARSE-CHECKOUTS, WILL LIKELY CHANGE IN
THE FUTURE.
COMMANDS
--------
'list'::
Provide a list of the contents in the sparse-checkout file.
'init'::
Enable the `core.sparseCheckout` setting. If the
sparse-checkout file does not exist, then populate it with
patterns that match every file in the root directory and
no other directories, then will remove all directories tracked
by Git. Add patterns to the sparse-checkout file to
repopulate the working directory.
+
To avoid interfering with other worktrees, it first enables the
`extensions.worktreeConfig` setting and makes sure to set the
`core.sparseCheckout` setting in the worktree-specific config file.
'set'::
Write a set of patterns to the sparse-checkout file, as given as
a list of arguments following the 'set' subcommand. Update the
working directory to match the new patterns. Enable the
core.sparseCheckout config setting if it is not already enabled.
SPARSE CHECKOUT
---------------
"Sparse checkout" allows populating the working directory sparsely.
It uses the skip-worktree bit (see linkgit:git-update-index[1]) to tell
Git whether a file in the working directory is worth looking at. If
the skip-worktree bit is set, then the file is ignored in the working
directory. Git will not populate the contents of those files, which
makes a sparse checkout helpful when working in a repository with many
files, but only a few are important to the current user.
The `$GIT_DIR/info/sparse-checkout` file is used to define the
skip-worktree reference bitmap. When Git updates the working
directory, it updates the skip-worktree bits in the index based
on this file. The files matching the patterns in the file will
appear in the working directory, and the rest will not.
## FULL PATTERN SET
By default, the sparse-checkout file uses the same syntax as `.gitignore`
files.
While `$GIT_DIR/info/sparse-checkout` is usually used to specify what
files are included, you can also specify what files are _not_ included,
using negative patterns. For example, to remove the file `unwanted`:
----------------
/*
!unwanted
----------------
Another tricky thing is fully repopulating the working directory when you
no longer want sparse checkout. You cannot just disable "sparse
checkout" because skip-worktree bits are still in the index and your working
directory is still sparsely populated. You should re-populate the working
directory with the `$GIT_DIR/info/sparse-checkout` file content as
follows:
----------------
/*
----------------
Then you can disable sparse checkout. Sparse checkout support in 'git
checkout' and similar commands is disabled by default. You need to
set `core.sparseCheckout` to `true` in order to have sparse checkout
support.
SEE ALSO
--------
linkgit:git-read-tree[1]
linkgit:gitignore[5]
GIT
---
Part of the linkgit:git[1] suite