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git/Documentation/git-read-tree.txt

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git-read-tree(1)
================
NAME
----
git-read-tree - Reads tree information into the index
SYNOPSIS
--------
[verse]
'git read-tree' [[-m [--trivial] [--aggressive] | --reset | --prefix=<prefix>]
read-tree, merge-recursive: overwrite ignored files by default This fixes a long-standing patchwork of ignored files handling in read-tree and merge-recursive, called out and suggested by Junio long ago. Quoting from commit dcf0c16ef1 ("core.excludesfile clean-up" 2007-11-16): git-read-tree takes --exclude-per-directory=<gitignore>, not because the flexibility was needed. Again, this was because the option predates the standardization of the ignore files. ... On the other hand, I think it makes perfect sense to fix git-read-tree, git-merge-recursive and git-clean to follow the same rule as other commands. I do not think of a valid use case to give an exclude-per-directory that is nonstandard to read-tree command, outside a "negative" test in the t1004 test script. This patch is the first step to untangle this mess. The next step would be to teach read-tree, merge-recursive and clean (in C) to use setup_standard_excludes(). History shows each of these were partially or fully fixed: * clean was taught the new trick in 1617adc7a0 ("Teach git clean to use setup_standard_excludes()", 2007-11-14). * read-tree was primarily used by checkout & merge scripts. checkout and merge later became builtins and were both fixed to use the new setup_standard_excludes() handling in fc001b526c ("checkout,merge: loosen overwriting untracked file check based on info/exclude", 2011-11-27). So the primary users were fixed, though read-tree itself was not. * merge-recursive has now been replaced as the default merge backend by merge-ort. merge-ort fixed this by using setup_standard_excludes() starting early in its implementation; see commit 6681ce5cf6 ("merge-ort: add implementation of checkout()", 2020-12-13), largely due to its design depending on checkout() and thus being influenced by the checkout code. However, merge-recursive itself was not fixed here, in part because its design meant it had difficulty differentiating between untracked files, ignored files, leftover tracked files that haven't been removed yet due to order of processing files, and files written by itself due to collisions). Make the conversion more complete by now handling read-tree and handling at least the unpack_trees() portion of merge-recursive. While merge-recursive is on its way out, fixing the unpack_trees() portion is easy and facilitates some of the later changes in this series. Note that fixing read-tree makes the --exclude-per-directory option to read-tree useless, so we remove it from the documentation (though we continue to accept it if passed). The read-tree changes happen to fix a bug in t1013. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 year ago
[-u | -i]] [--index-output=<file>] [--no-sparse-checkout]
(--empty | <tree-ish1> [<tree-ish2> [<tree-ish3>]])
DESCRIPTION
-----------
Reads the tree information given by <tree-ish> into the index,
but does not actually *update* any of the files it "caches". (see:
linkgit:git-checkout-index[1])
Optionally, it can merge a tree into the index, perform a
fast-forward (i.e. 2-way) merge, or a 3-way merge, with the `-m`
flag. When used with `-m`, the `-u` flag causes it to also update
the files in the work tree with the result of the merge.
Trivial merges are done by 'git read-tree' itself. Only conflicting paths
will be in unmerged state when 'git read-tree' returns.
OPTIONS
-------
-m::
Perform a merge, not just a read. The command will
refuse to run if your index file has unmerged entries,
indicating that you have not finished previous merge you
started.
--reset::
read-tree.txt: clarify --reset and worktree changes The description of --reset stays true to the first implementation in 438195cced (git-read-tree: add "--reset" flag, 2005-06-09). That is, --reset discards unmerged entries. Or at least true to the commit message because I can't be sure about read-tree's behavior regarding local changes. But in fcc387db9b (read-tree -m -u: do not overwrite or remove untracked working tree files., 2006-05-17), it is clear that "-m -u" tries to keep local changes, while --reset is singled out and will keep overwriting worktree files. It's not stated in the commit message, but it's obvious from the patch. I went this far back not because I had a lot of free time, but because I did not trust my reading of unpack-trees.c code. So far I think the related changes in history agree with my understanding of the current code, that "--reset" loses local changes. This behavior is not mentioned in git-read-tree.txt, even though old-timers probably can just guess it based on the "reset" name. Update git-read-tree.txt about this. Side note. There's another change regarding --reset that is not obviously about local changes, b018ff6085 (unpack-trees: fix "read-tree -u --reset A B" with conflicted index, 2012-12-29). But I'm pretty sure this is about the first function of --reset, to discard unmerged entries correctly. PS. The patch changes one more line than necessary because the first line uses spaces instead of tab. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
4 years ago
Same as -m, except that unmerged entries are discarded instead
of failing. When used with `-u`, updates leading to loss of
working tree changes or untracked files or directories will not
abort the operation.
-u::
After a successful merge, update the files in the work
tree with the result of the merge.
-i::
Usually a merge requires the index file as well as the
files in the working tree to be up to date with the
current head commit, in order not to lose local
changes. This flag disables the check with the working
tree and is meant to be used when creating a merge of
trees that are not directly related to the current
working tree status into a temporary index file.
-n::
--dry-run::
Check if the command would error out, without updating the index
or the files in the working tree for real.
-v::
Show the progress of checking files out.
--trivial::
Restrict three-way merge by 'git read-tree' to happen
only if there is no file-level merging required, instead
of resolving merge for trivial cases and leaving
conflicting files unresolved in the index.
--aggressive::
Usually a three-way merge by 'git read-tree' resolves
the merge for really trivial cases and leaves other
cases unresolved in the index, so that porcelains can
implement different merge policies. This flag makes the
command resolve a few more cases internally:
+
* when one side removes a path and the other side leaves the path
unmodified. The resolution is to remove that path.
* when both sides remove a path. The resolution is to remove that path.
* when both sides add a path identically. The resolution
is to add that path.
--prefix=<prefix>::
Keep the current index contents, and read the contents
of the named tree-ish under the directory at `<prefix>`.
The command will refuse to overwrite entries that already
existed in the original index file.
--index-output=<file>::
Instead of writing the results out to `$GIT_INDEX_FILE`,
write the resulting index in the named file. While the
command is operating, the original index file is locked
with the same mechanism as usual. The file must allow
to be rename(2)ed into from a temporary file that is
created next to the usual index file; typically this
means it needs to be on the same filesystem as the index
file itself, and you need write permission to the
directories the index file and index output file are
located in.
--[no-]recurse-submodules::
doc: --recurse-submodules mostly applies to active submodules The documentation refers to "initialized" or "populated" submodules, to explain which submodules are affected by '--recurse-submodules', but the real terminology here is 'active' submodules. Update the documentation accordingly. Some terminology: - Active is defined in gitsubmodules(7), it only involves the configuration variables 'submodule.active', 'submodule.<name>.active' and 'submodule.<name>.url'. The function submodule.c::is_submodule_active checks that a submodule is active. - Populated means that the submodule's working tree is present (and the gitfile correctly points to the submodule repository), i.e. either the superproject was cloned with ` --recurse-submodules`, or the user ran `git submodule update --init`, or `git submodule init [<path>]` and `git submodule update [<path>]` separately which populated the submodule working tree. This does not involve the 3 configuration variables above. - Initialized (at least in the context of the man pages involved in this patch) means both "populated" and "active" as defined above, i.e. what `git submodule update --init` does. The --recurse-submodules option mostly affects active submodules. An exception is `git fetch` where the option affects populated submodules. As a consequence, in `git pull --recurse-submodules` the fetch affects populated submodules, but the resulting working tree update only affects active submodules. In the documentation of `git-pull`, let's distinguish between the fetching part which affects populated submodules, and the updating of worktrees, which only affects active submodules. Signed-off-by: Damien Robert <damien.olivier.robert+git@gmail.com> Helped-by: Philippe Blain <levraiphilippeblain@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
3 years ago
Using --recurse-submodules will update the content of all active
submodules according to the commit recorded in the superproject by
calling read-tree recursively, also setting the submodules' HEAD to be
detached at that commit.
--no-sparse-checkout::
Disable sparse checkout support even if `core.sparseCheckout`
is true.
--empty::
Instead of reading tree object(s) into the index, just empty
it.
-q::
--quiet::
Quiet, suppress feedback messages.
<tree-ish#>::
The id of the tree object(s) to be read/merged.
MERGING
-------
If `-m` is specified, 'git read-tree' can perform 3 kinds of
merge, a single tree merge if only 1 tree is given, a
fast-forward merge with 2 trees, or a 3-way merge if 3 or more trees are
provided.
Single Tree Merge
~~~~~~~~~~~~~~~~~
If only 1 tree is specified, 'git read-tree' operates as if the user did not
specify `-m`, except that if the original index has an entry for a
given pathname, and the contents of the path match with the tree
being read, the stat info from the index is used. (In other words, the
index's stat()s take precedence over the merged tree's).
That means that if you do a `git read-tree -m <newtree>` followed by a
`git checkout-index -f -u -a`, the 'git checkout-index' only checks out
the stuff that really changed.
This is used to avoid unnecessary false hits when 'git diff-files' is
run after 'git read-tree'.
Two Tree Merge
~~~~~~~~~~~~~~
Typically, this is invoked as `git read-tree -m $H $M`, where $H
is the head commit of the current repository, and $M is the head
of a foreign tree, which is simply ahead of $H (i.e. we are in a
fast-forward situation).
When two trees are specified, the user is telling 'git read-tree'
the following:
1. The current index and work tree is derived from $H, but
the user may have local changes in them since $H.
2. The user wants to fast-forward to $M.
In this case, the `git read-tree -m $H $M` command makes sure
that no local change is lost as the result of this "merge".
Here are the "carry forward" rules, where "I" denotes the index,
"clean" means that index and work tree coincide, and "exists"/"nothing"
refer to the presence of a path in the specified commit:
doc: put literal block delimiter around table The git-read-tree manpage has a table that is meant to be shown with its spacing exactly as it is in the source. We mark it as a "literal paragraph" by indenting each line by at least one space. This renders OK with asciidoc for both the HTML and manpage versions. But there are two problems when we render it with asciidoctor. The first is that some lines mix tabs and spaces. Even if asciidoctor is correctly configured for 8-space tabs, it seems to handle this case differently, soaking up some of the initial literal-paragraph spaces and mis-aligning the table text. The second problem is that the table uses blank lines to group rows. But as blank lines separate paragraphs in asciidoc, this actually means that each chunk of the table is rendered in its own pre-formatted <div> block. This happens even with vanilla asciidoc, but there's no visible result because the literal paragraphs aren't styled in any special way. But with asciidoctor (or at least the styles used on git-scm.com), literal paragraphs are styled with a different background. This breaks the table into a visually distracting sequence of chunks. We can fix both by adding a literal-paragraph block delimiter. That turns the whole table into a single block (for both implementations) and causes asciidoctor to render the indentation as it is in the source. Reported-at: https://github.com/git/git-scm.com/issues/1023 Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
5 years ago
....
I H M Result
-------------------------------------------------------
0 nothing nothing nothing (does not happen)
1 nothing nothing exists use M
2 nothing exists nothing remove path from index
3 nothing exists exists, use M if "initial checkout",
H == M keep index otherwise
exists, fail
H != M
clean I==H I==M
------------------
4 yes N/A N/A nothing nothing keep index
5 no N/A N/A nothing nothing keep index
6 yes N/A yes nothing exists keep index
7 no N/A yes nothing exists keep index
8 yes N/A no nothing exists fail
9 no N/A no nothing exists fail
10 yes yes N/A exists nothing remove path from index
11 no yes N/A exists nothing fail
12 yes no N/A exists nothing fail
13 no no N/A exists nothing fail
clean (H==M)
------
14 yes exists exists keep index
15 no exists exists keep index
clean I==H I==M (H!=M)
------------------
16 yes no no exists exists fail
17 no no no exists exists fail
18 yes no yes exists exists keep index
19 no no yes exists exists keep index
20 yes yes no exists exists use M
21 no yes no exists exists fail
doc: put literal block delimiter around table The git-read-tree manpage has a table that is meant to be shown with its spacing exactly as it is in the source. We mark it as a "literal paragraph" by indenting each line by at least one space. This renders OK with asciidoc for both the HTML and manpage versions. But there are two problems when we render it with asciidoctor. The first is that some lines mix tabs and spaces. Even if asciidoctor is correctly configured for 8-space tabs, it seems to handle this case differently, soaking up some of the initial literal-paragraph spaces and mis-aligning the table text. The second problem is that the table uses blank lines to group rows. But as blank lines separate paragraphs in asciidoc, this actually means that each chunk of the table is rendered in its own pre-formatted <div> block. This happens even with vanilla asciidoc, but there's no visible result because the literal paragraphs aren't styled in any special way. But with asciidoctor (or at least the styles used on git-scm.com), literal paragraphs are styled with a different background. This breaks the table into a visually distracting sequence of chunks. We can fix both by adding a literal-paragraph block delimiter. That turns the whole table into a single block (for both implementations) and causes asciidoctor to render the indentation as it is in the source. Reported-at: https://github.com/git/git-scm.com/issues/1023 Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
5 years ago
....
In all "keep index" cases, the index entry stays as in the
original index file. If the entry is not up to date,
'git read-tree' keeps the copy in the work tree intact when
operating under the -u flag.
When this form of 'git read-tree' returns successfully, you can
see which of the "local changes" that you made were carried forward by running
`git diff-index --cached $M`. Note that this does not
necessarily match what `git diff-index --cached $H` would have
produced before such a two tree merge. This is because of cases
18 and 19 --- if you already had the changes in $M (e.g. maybe
you picked it up via e-mail in a patch form), `git diff-index
--cached $H` would have told you about the change before this
merge, but it would not show in `git diff-index --cached $M`
output after the two-tree merge.
Case 3 is slightly tricky and needs explanation. The result from this
rule logically should be to remove the path if the user staged the removal
of the path and then switching to a new branch. That however will prevent
the initial checkout from happening, so the rule is modified to use M (new
tree) only when the content of the index is empty. Otherwise the removal
of the path is kept as long as $H and $M are the same.
3-Way Merge
~~~~~~~~~~~
Each "index" entry has two bits worth of "stage" state. stage 0 is the
normal one, and is the only one you'd see in any kind of normal use.
However, when you do 'git read-tree' with three trees, the "stage"
starts out at 1.
This means that you can do
----------------
$ git read-tree -m <tree1> <tree2> <tree3>
----------------
and you will end up with an index with all of the <tree1> entries in
"stage1", all of the <tree2> entries in "stage2" and all of the
<tree3> entries in "stage3". When performing a merge of another
branch into the current branch, we use the common ancestor tree
as <tree1>, the current branch head as <tree2>, and the other
branch head as <tree3>.
Furthermore, 'git read-tree' has special-case logic that says: if you see
a file that matches in all respects in the following states, it
"collapses" back to "stage0":
- stage 2 and 3 are the same; take one or the other (it makes no
difference - the same work has been done on our branch in
stage 2 and their branch in stage 3)
- stage 1 and stage 2 are the same and stage 3 is different; take
stage 3 (our branch in stage 2 did not do anything since the
ancestor in stage 1 while their branch in stage 3 worked on
it)
- stage 1 and stage 3 are the same and stage 2 is different take
stage 2 (we did something while they did nothing)
The 'git write-tree' command refuses to write a nonsensical tree, and it
will complain about unmerged entries if it sees a single entry that is not
stage 0.
OK, this all sounds like a collection of totally nonsensical rules,
but it's actually exactly what you want in order to do a fast
merge. The different stages represent the "result tree" (stage 0, aka
"merged"), the original tree (stage 1, aka "orig"), and the two trees
you are trying to merge (stage 2 and 3 respectively).
The order of stages 1, 2 and 3 (hence the order of three
<tree-ish> command-line arguments) are significant when you
start a 3-way merge with an index file that is already
populated. Here is an outline of how the algorithm works:
- if a file exists in identical format in all three trees, it will
automatically collapse to "merged" state by 'git read-tree'.
- a file that has _any_ difference what-so-ever in the three trees
will stay as separate entries in the index. It's up to "porcelain
policy" to determine how to remove the non-0 stages, and insert a
merged version.
- the index file saves and restores with all this information, so you
can merge things incrementally, but as long as it has entries in
stages 1/2/3 (i.e., "unmerged entries") you can't write the result. So
now the merge algorithm ends up being really simple:
* you walk the index in order, and ignore all entries of stage 0,
since they've already been done.
* if you find a "stage1", but no matching "stage2" or "stage3", you
know it's been removed from both trees (it only existed in the
original tree), and you remove that entry.
* if you find a matching "stage2" and "stage3" tree, you remove one
of them, and turn the other into a "stage0" entry. Remove any
matching "stage1" entry if it exists too. .. all the normal
trivial rules ..
You would normally use 'git merge-index' with supplied
'git merge-one-file' to do this last step. The script updates
the files in the working tree as it merges each path and at the
end of a successful merge.
When you start a 3-way merge with an index file that is already
populated, it is assumed that it represents the state of the
files in your work tree, and you can even have files with
changes unrecorded in the index file. It is further assumed
that this state is "derived" from the stage 2 tree. The 3-way
merge refuses to run if it finds an entry in the original index
file that does not match stage 2.
This is done to prevent you from losing your work-in-progress
changes, and mixing your random changes in an unrelated merge
commit. To illustrate, suppose you start from what has been
committed last to your repository:
----------------
$ JC=`git rev-parse --verify "HEAD^0"`
$ git checkout-index -f -u -a $JC
----------------
You do random edits, without running 'git update-index'. And then
you notice that the tip of your "upstream" tree has advanced
since you pulled from him:
----------------
$ git fetch git://.... linus
$ LT=`git rev-parse FETCH_HEAD`
----------------
Your work tree is still based on your HEAD ($JC), but you have
some edits since. Three-way merge makes sure that you have not
added or modified index entries since $JC, and if you haven't,
then does the right thing. So with the following sequence:
----------------
$ git read-tree -m -u `git merge-base $JC $LT` $JC $LT
$ git merge-index git-merge-one-file -a
$ echo "Merge with Linus" | \
git commit-tree `git write-tree` -p $JC -p $LT
----------------
what you would commit is a pure merge between $JC and $LT without
your work-in-progress changes, and your work tree would be
updated to the result of the merge.
However, if you have local changes in the working tree that
would be overwritten by this merge, 'git read-tree' will refuse
to run to prevent your changes from being lost.
In other words, there is no need to worry about what exists only
in the working tree. When you have local changes in a part of
the project that is not involved in the merge, your changes do
not interfere with the merge, and are kept intact. When they
*do* interfere, the merge does not even start ('git read-tree'
complains loudly and fails without modifying anything). In such
a case, you can simply continue doing what you were in the
middle of doing, and when your working tree is ready (i.e. you
have finished your work-in-progress), attempt the merge again.
SPARSE CHECKOUT
---------------
Note: The skip-worktree capabilities in linkgit:git-update-index[1]
and `read-tree` predated the introduction of
linkgit:git-sparse-checkout[1]. Users are encouraged to use the
`sparse-checkout` command in preference to these plumbing commands for
sparse-checkout/skip-worktree related needs. However, the information
below might be useful to users trying to understand the pattern style
used in non-cone mode of the `sparse-checkout` command.
Update documentation related to sparsity and the skip-worktree bit Make several small updates, to address a few documentation issues I spotted: * sparse-checkout focused on "patterns" even though the inputs (and outputs in the case of `list`) are directories in cone-mode * The description section of the sparse-checkout documentation was a bit sparse (no pun intended), and focused more on internal mechanics rather than end user usage. This made sense in the early days when the command was even more experimental, but let's adjust a bit to try to make it more approachable to end users who may want to consider using it. Keep the scary backward compatibility warning, though; we're still hard at work trying to fix up commands to behave reasonably in sparse checkouts. * both read-tree and update-index tried to describe how to use the skip-worktree bit, but both predated the sparse-checkout command. The sparse-checkout command is a far easier mechanism to use and for users trying to reduce the size of their working tree, we should recommend users to look at it instead. * The update-index documentation pointed out that assume-unchanged and skip-worktree sounded similar but had different purposes. However, it made no attempt to explain the differences, only to point out that they were different. Explain the differences. * The update-index documentation focused much more on (internal?) implementation details than on end-user usage. Try to explain its purpose better for users of update-index, rather than fellow developers trying to work with the SKIP_WORKTREE bit. * Clarify that when core.sparseCheckout=true, we treat a file's presence in the working tree as being an override to the SKIP_WORKTREE bit (i.e. in sparse checkouts when the file is present we ignore the SKIP_WORKTREE bit). Note that this commit, like many touching documentation, is best viewed with the `--color-words` option to diff/log. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
11 months ago
"Sparse checkout" allows populating the working directory sparsely.
Update documentation related to sparsity and the skip-worktree bit Make several small updates, to address a few documentation issues I spotted: * sparse-checkout focused on "patterns" even though the inputs (and outputs in the case of `list`) are directories in cone-mode * The description section of the sparse-checkout documentation was a bit sparse (no pun intended), and focused more on internal mechanics rather than end user usage. This made sense in the early days when the command was even more experimental, but let's adjust a bit to try to make it more approachable to end users who may want to consider using it. Keep the scary backward compatibility warning, though; we're still hard at work trying to fix up commands to behave reasonably in sparse checkouts. * both read-tree and update-index tried to describe how to use the skip-worktree bit, but both predated the sparse-checkout command. The sparse-checkout command is a far easier mechanism to use and for users trying to reduce the size of their working tree, we should recommend users to look at it instead. * The update-index documentation pointed out that assume-unchanged and skip-worktree sounded similar but had different purposes. However, it made no attempt to explain the differences, only to point out that they were different. Explain the differences. * The update-index documentation focused much more on (internal?) implementation details than on end-user usage. Try to explain its purpose better for users of update-index, rather than fellow developers trying to work with the SKIP_WORKTREE bit. * Clarify that when core.sparseCheckout=true, we treat a file's presence in the working tree as being an override to the SKIP_WORKTREE bit (i.e. in sparse checkouts when the file is present we ignore the SKIP_WORKTREE bit). Note that this commit, like many touching documentation, is best viewed with the `--color-words` option to diff/log. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
11 months ago
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.
'git read-tree' and other merge-based commands ('git merge', 'git
checkout'...) can help maintaining the skip-worktree bitmap and working
directory update. `$GIT_DIR/info/sparse-checkout` is used to
define the skip-worktree reference bitmap. When 'git read-tree' needs
to update the working directory, it resets the skip-worktree bit in the index
based on this file, which uses the same syntax as .gitignore files.
Update documentation related to sparsity and the skip-worktree bit Make several small updates, to address a few documentation issues I spotted: * sparse-checkout focused on "patterns" even though the inputs (and outputs in the case of `list`) are directories in cone-mode * The description section of the sparse-checkout documentation was a bit sparse (no pun intended), and focused more on internal mechanics rather than end user usage. This made sense in the early days when the command was even more experimental, but let's adjust a bit to try to make it more approachable to end users who may want to consider using it. Keep the scary backward compatibility warning, though; we're still hard at work trying to fix up commands to behave reasonably in sparse checkouts. * both read-tree and update-index tried to describe how to use the skip-worktree bit, but both predated the sparse-checkout command. The sparse-checkout command is a far easier mechanism to use and for users trying to reduce the size of their working tree, we should recommend users to look at it instead. * The update-index documentation pointed out that assume-unchanged and skip-worktree sounded similar but had different purposes. However, it made no attempt to explain the differences, only to point out that they were different. Explain the differences. * The update-index documentation focused much more on (internal?) implementation details than on end-user usage. Try to explain its purpose better for users of update-index, rather than fellow developers trying to work with the SKIP_WORKTREE bit. * Clarify that when core.sparseCheckout=true, we treat a file's presence in the working tree as being an override to the SKIP_WORKTREE bit (i.e. in sparse checkouts when the file is present we ignore the SKIP_WORKTREE bit). Note that this commit, like many touching documentation, is best viewed with the `--color-words` option to diff/log. Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
11 months ago
If an entry matches a pattern in this file, or the entry corresponds to
a file present in the working tree, then skip-worktree will not be
set on that entry. Otherwise, skip-worktree will be set.
Then it compares the new skip-worktree value with the previous one. If
skip-worktree turns from set to unset, it will add the corresponding
file back. If it turns from unset to set, that file will be removed.
While `$GIT_DIR/info/sparse-checkout` is usually used to specify what
files are in, you can also specify what files are _not_ in, using
negate patterns. For example, to remove the file `unwanted`:
----------------
/*
!unwanted
----------------
Another tricky thing is fully repopulating the working directory when you
no longer want sparse checkout. You cannot just disable "sparse
checkout" because skip-worktree bits are still in the index and your working
directory is still sparsely populated. You should re-populate the working
directory with the `$GIT_DIR/info/sparse-checkout` file content as
follows:
----------------
/*
----------------
Then you can disable sparse checkout. Sparse checkout support in 'git
read-tree' and similar commands is disabled by default. You need to
turn `core.sparseCheckout` on in order to have sparse checkout
support.
SEE ALSO
--------
linkgit:git-write-tree[1], linkgit:git-ls-files[1],
linkgit:gitignore[5], linkgit:git-sparse-checkout[1]
GIT
---
Part of the linkgit:git[1] suite