How to sparsely checkout only one single file from

问题:

How do I checkout just one file from a git repo?

回答1:

Originally, I mentioned in 2012 git archive (see Jared Forsyth\'s answer and Robert Knight\'s answer), since git1.7.9.5 (March 2012), Paul Brannan\'s answer:

git archive --format=tar --remote=origin HEAD:path/to/directory -- filename | tar -O -xf -

But: in 2013, that was no longer possible for remote https://github.com URLs.
See the old page \"Can I archive a repository?\"

The current (2018) page \"About archiving content and data on GitHub\" recommends using third-party services like GHTorrent or GH Archive.

---

So you can also deal with local copies/clone:

You could alternatively do the following if you have a local copy of the bare repository as mentioned in this answer,

git --no-pager --git-dir /path/to/bar/repo.git show branch:path/to/file >file

---

Or you must clone first the repo, meaning you get the full history: - in the .git repo - in the working tree.

• But then you can do a sparse checkout (if you are using Git1.7+),:
  • enable the sparse checkout option (git config core.sparsecheckout true)
  • adding what you want to see in the .git/info/sparse-checkout file
  • re-reading the working tree to only display what you need

To re-read the working tree:

$ git read-tree -m -u HEAD

That way, you end up with a working tree including precisely what you want (even if it is only one file)

回答2:

First clone the repo with the -n option, which suppresses the default checkout of all files, and the --depth 1 option, which means it only gets the most recent revision of each file

git clone -n git://path/to/the_repo.git --depth 1

Then check out just the file you want like so:

cd the_repo
git checkout HEAD name_of_file

回答3:

If you already have a copy of the git repo, you can always checkout a version of a file using a git log to find out the hash-id (for example 3cdc61015724f9965575ba954c8cd4232c8b42e4) and then you simply type:

git checkout hash-id path-to-file

Here is an actual example:

git checkout 3cdc61015724f9965575ba954c8cd4232c8b42e4 /var/www/css/page.css

回答4:

Normally it\'s not possible to download just one file from git without downloading the whole repository as suggested in the first answer. It\'s because Git doesn\'t store files as you think (as CVS/SVN do), but it generates them based on the entire history of the project.

But there are some workarounds for specific cases. See below:

GitHub

If this file is on github.com, try e.g.:

wget https://raw.githubusercontent.com/user/project/master/README

GitWeb

If you\'re using Git on the Server - GitWeb, then you may try in example (change it into the right path):

wget \"http://example.com/gitweb/?p=example;a=blob_plain;f=README.txt;hb=HEAD\"

GitWeb at drupalcode.org

Example:

wget \"http://drupalcode.org/project/ads.git/blob_plain/refs/heads/master:/README.md\"

googlesource.com

There is an undocumented feature that allows you to download base64-encoded versions of raw files:

curl \"https://chromium.googlesource.com/chromium/src/net/+/master/http/transport_security_state_static.json?format=TEXT\" | base64 --decode

---

In other cases check if your Git repository is using any web interfaces.

If it\'s not using any web interface, you may consider to push your code to external services such as GitHub, Bitbucket, etc. and use it as a mirror.

If you don\'t have wget installed, try curl -O (url) alternatively.

回答5:

git checkout branch_or_version -- path/file

example: git checkout HEAD -- main.c

回答6:

Minimal Guide

git checkout -- <filename>

---

Ref: https://git-scm.com/docs/git-checkout

Dup: Undo working copy modifications of one file in Git?

回答7:

Working in GIT 1.7.2.2

For example you have a remote some_remote with branches branch1, branch32

so to checkout a specific file you call this commands:

git checkout remote/branch path/to/file

as an example it will be something like this

git checkout some_remote/branch32 conf/en/myscript.conf
git checkout some_remote/branch1 conf/fr/load.wav

This checkout command will copy the whole file structure conf/en and conf/fr into the current directory where you call these commands (of course I assume you ran git init at some point before)

回答8:

Now we can! As this is the first result on google, I thought I\'d update this to the latest standing. With the advent of git 1.7.9.5, we have the git archive command which will allow you to retrieve a single file from a remote host.

git archive --remote=git://git.foo.com/project.git HEAD:path/to/directory filename | tar -x

See answer in full here https://stackoverflow.com/a/5324532/290784

回答9:

Very simple:

git checkout from-branch-name -- path/to/the/file/you/want

This will not checkout the from-branch-name branch. You will stay on whatever branch you are on, and only that single file will be checked out from the specified branch.

Here\'s the relevant part of the manpage for git-checkout

git checkout [-p|--patch] [<tree-ish>] [--] <pathspec>...
       When <paths> or --patch are given, git checkout does not switch
       branches. It updates the named paths in the working tree from the
       index file or from a named <tree-ish> (most often a commit). In
       this case, the -b and --track options are meaningless and giving
       either of them results in an error. The <tree-ish> argument can be
       used to specify a specific tree-ish (i.e. commit, tag or tree) to
       update the index for the given paths before updating the working
       tree.

Hat tip to Ariejan de Vroom who taught me this from this blog post.

回答10:

You can do it by

git archive --format=tar --remote=origin HEAD | tar xf -
git archive --format=tar --remote=origin HEAD <file> | tar xf -

回答11:

In git you do not \'checkout\' files before you update them - it seems like this is what you are after.

Many systems like clearcase, csv and so on require you to \'checkout\' a file before you can make changes to it. Git does not require this. You clone a repository and then make changes in your local copy of repository.

Once you updated files you can do:

git status

To see what files have been modified. You add the ones you want to commit to index first with (index is like a list to be checked in):

git add .

or

git add blah.c

Then do git status will show you which files were modified and which are in index ready to be commited or checked in.

To commit files to your copy of repository do:

git commit -a -m \"commit message here\"

See git website for links to manuals and guides.

回答12:

Two variants on what\'s already been given:

git archive --format=tar --remote=git://git.foo.com/project.git HEAD:path/to/directory filename | tar -O -xf -

and:

git archive --format=zip --remote=git://git.foo.com/project.git HEAD:path/to/directory filename | funzip

These write the file to standard output.

回答13:

Say the file name is 123.txt, this works for me:

git checkout --theirs  123.txt

If the file is inside a directory A, make sure to specify it correctly:

git checkout --theirs  \"A/123.txt\"

回答14:

git clone --filter from Git 2.19

This option will actually skip fetching most unneeded objects from the server:

git clone --depth 1 --no-checkout --filter=blob:none \\
  \"file://$(pwd)/server_repo\" local_repo
cd local_repo
git checkout master -- mydir/myfile

The server should be configured with:

git config --local uploadpack.allowfilter 1
git config --local uploadpack.allowanysha1inwant 1

There is no server support as of v2.19.0, but it can already be locally tested.

TODO: --filter=blob:none skips all blobs, but still fetches all tree objects. But on a normal repo, this should be tiny compared to the files themselves, so this is already good enough. Asked at: https://www.spinics.net/lists/git/msg342006.html Devs replied a --filter=tree:0 is in the works to do that.

Remember that --depth 1 already implies --single-branch, see also: How do I clone a single branch in Git?

file://$(path) is required to overcome git clone protocol shenanigans: How to shallow clone a local git repository with a relative path?

The format of --filter is documented on man git-rev-list.

An extension was made to the Git remote protocol to support this feature.

Docs on Git tree:

• https://github.com/git/git/blob/v2.19.0/Documentation/technical/partial-clone.txt
• https://github.com/git/git/blob/v2.19.0/Documentation/rev-list-options.txt#L720
• https://github.com/git/git/blob/v2.19.0/t/t5616-partial-clone.sh

Test it out

#!/usr/bin/env bash
set -eu

list-objects() (
  git rev-list --all --objects
  echo \"master commit SHA: $(git log -1 --format=\"%H\")\"
  echo \"mybranch commit SHA: $(git log -1 --format=\"%H\")\"
  git ls-tree master
  git ls-tree mybranch | grep mybranch
  git ls-tree master~ | grep root
)

# Reproducibility.
export GIT_COMMITTER_NAME=\'a\'
export GIT_COMMITTER_EMAIL=\'a\'
export GIT_AUTHOR_NAME=\'a\'
export GIT_AUTHOR_EMAIL=\'a\'
export GIT_COMMITTER_DATE=\'2000-01-01T00:00:00+0000\'
export GIT_AUTHOR_DATE=\'2000-01-01T00:00:00+0000\'

rm -rf server_repo local_repo
mkdir server_repo
cd server_repo

# Create repo.
git init --quiet
git config --local uploadpack.allowfilter 1
git config --local uploadpack.allowanysha1inwant 1

# First commit.
# Directories present in all branches.
mkdir d1 d2
printf \'d1/a\' > ./d1/a
printf \'d1/b\' > ./d1/b
printf \'d2/a\' > ./d2/a
printf \'d2/b\' > ./d2/b
# Present only in root.
mkdir \'root\'
printf \'root\' > ./root/root
git add .
git commit -m \'root\' --quiet

# Second commit only on master.
git rm --quiet -r ./root
mkdir \'master\'
printf \'master\' > ./master/master
git add .
git commit -m \'master commit\' --quiet

# Second commit only on mybranch.
git checkout -b mybranch --quiet master~
git rm --quiet -r ./root
mkdir \'mybranch\'
printf \'mybranch\' > ./mybranch/mybranch
git add .
git commit -m \'mybranch commit\' --quiet

echo \"# List and identify all objects\"
list-objects
echo

# Restore master.
git checkout --quiet master
cd ..

# Clone. Don\'t checkout for now, only .git/ dir.
git clone --depth 1 --quiet --no-checkout --filter=blob:none \"file://$(pwd)/server_repo\" local_repo
cd local_repo

# List missing objects from master.
echo \"# Missing objects after --no-checkout\"
git rev-list --all --quiet --objects --missing=print
echo

echo \"# Git checkout fails without internet\"
mv ../server_repo ../server_repo.off
! git checkout master
echo

echo \"# Git checkout fetches the missing file from internet\"
mv ../server_repo.off ../server_repo
git checkout master -- d1/a
echo

echo \"# Missing objects after checking out d1/a\"
git rev-list --all --quiet --objects --missing=print

GitHub upstream.

Output in Git v2.19.0:

# List and identify all objects
c6fcdfaf2b1462f809aecdad83a186eeec00f9c1
fc5e97944480982cfc180a6d6634699921ee63ec
7251a83be9a03161acde7b71a8fda9be19f47128
62d67bce3c672fe2b9065f372726a11e57bade7e
b64bf435a3e54c5208a1b70b7bcb0fc627463a75 d1
308150e8fddde043f3dbbb8573abb6af1df96e63 d1/a
f70a17f51b7b30fec48a32e4f19ac15e261fd1a4 d1/b
84de03c312dc741d0f2a66df7b2f168d823e122a d2
0975df9b39e23c15f63db194df7f45c76528bccb d2/a
41484c13520fcbb6e7243a26fdb1fc9405c08520 d2/b
7d5230379e4652f1b1da7ed1e78e0b8253e03ba3 master
8b25206ff90e9432f6f1a8600f87a7bd695a24af master/master
ef29f15c9a7c5417944cc09711b6a9ee51b01d89
19f7a4ca4a038aff89d803f017f76d2b66063043 mybranch
1b671b190e293aa091239b8b5e8c149411d00523 mybranch/mybranch
c3760bb1a0ece87cdbaf9a563c77a45e30a4e30e
a0234da53ec608b54813b4271fbf00ba5318b99f root
93ca1422a8da0a9effc465eccbcb17e23015542d root/root
master commit SHA: fc5e97944480982cfc180a6d6634699921ee63ec
mybranch commit SHA: fc5e97944480982cfc180a6d6634699921ee63ec
040000 tree b64bf435a3e54c5208a1b70b7bcb0fc627463a75    d1
040000 tree 84de03c312dc741d0f2a66df7b2f168d823e122a    d2
040000 tree 7d5230379e4652f1b1da7ed1e78e0b8253e03ba3    master
040000 tree 19f7a4ca4a038aff89d803f017f76d2b66063043    mybranch
040000 tree a0234da53ec608b54813b4271fbf00ba5318b99f    root

# Missing objects after --no-checkout
?f70a17f51b7b30fec48a32e4f19ac15e261fd1a4
?8b25206ff90e9432f6f1a8600f87a7bd695a24af
?41484c13520fcbb6e7243a26fdb1fc9405c08520
?0975df9b39e23c15f63db194df7f45c76528bccb
?308150e8fddde043f3dbbb8573abb6af1df96e63

# Git checkout fails without internet
fatal: \'/home/ciro/bak/git/test-git-web-interface/other-test-repos/partial-clone.tmp/server_repo\' does not appear to be a git repository
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

# Git checkout fetches the missing directory from internet
remote: Enumerating objects: 1, done.
remote: Counting objects: 100% (1/1), done.
remote: Total 1 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (1/1), 45 bytes | 45.00 KiB/s, done.
remote: Enumerating objects: 1, done.
remote: Counting objects: 100% (1/1), done.
remote: Total 1 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (1/1), 45 bytes | 45.00 KiB/s, done.

# Missing objects after checking out d1
?f70a17f51b7b30fec48a32e4f19ac15e261fd1a4
?8b25206ff90e9432f6f1a8600f87a7bd695a24af
?41484c13520fcbb6e7243a26fdb1fc9405c08520
?0975df9b39e23c15f63db194df7f45c76528bccb

Conclusions: all blobs except d1/a are missing. E.g. f70a17f51b7b30fec48a32e4f19ac15e261fd1a4, which is d1/b, is not there after checking out d1/.

Note that root/root and mybranch/mybranch are also missing, but --depth 1 hides that from the list of missing files. If you remove --depth 1, then they show on the list of missing files.

回答15:

It sounds like you\'re trying to carry over an idea from centralized version control, which git by nature is not - it\'s distributed. If you want to work with a git repository, you clone it. You then have all of the contents of the work tree, and all of the history (well, at least everything leading up to the tip of the current branch), not just a single file or a snapshot from a single commit.

 git clone /path/to/repo
 git clone git://url/of/repo
 git clone http://url/of/repo

回答16:

If you only need to download the file, no need to check out with Git.

GitHub Mate is much easier to do so, it\'s a Chrome extension, enables you click the file icon to download it. also open source

回答17:

If you need a specific file from a specific branch from a remote Git repository the command is:

git archive --remote=git://git.example.com/project.git refs/heads/mybranch path/to/myfile |tar xf -

The rest can be derived from @VonC\'s answer:

If you need a specific file from the master branch it is:

git archive --remote=git://git.example.com/project.git HEAD path/to/myfile |tar xf -

If you need a specific file from a tag it is:

git archive --remote=git://git.example.com/project.git mytag path/to/myfile |tar xf -

回答18:

I don’t see what worked for me listed out here so I will include it should anybody be in my situation.

My situation, I have a remote repository of maybe 10,000 files and I need to build an RPM file for my Linux system. The build of the RPM includes a git clone of everything. All I need is one file to start the RPM build. I can clone the entire source tree which does what I need but it takes an extra two minutes to download all those files when all I need is one. I tried to use the git archive option discussed and I got “fatal: Operation not supported by protocol.” It seems I have to get some sort of archive option enabled on the server and my server is maintained by bureaucratic thugs that seem to enjoy making it difficult to get things done.

What I finally did was I went into the web interface for bitbucket and viewed the one file I needed. I did a right click on the link to download a raw copy of the file and selected “copy shortcut” from the resulting popup. I could not just download the raw file because I needed to automate things and I don’t have a browser interface on my Linux server.

For the sake of discussion, that resulted in the URL:

https://ourArchive.ourCompany.com/projects/ThisProject/repos/data/raw/foo/bar.spec?at=refs%2Fheads%2FTheBranchOfInterest

I could not directly download this file from the bitbucket repository because I needed to sign in first. After a little digging, I found this worked: On Linux:

echo \"myUser:myPass123\"| base64
bXlVc2VyOm15UGFzczEyMwo=

curl -H \'Authorization: Basic bXlVc2VyOm15UGFzczEyMwo=\' \'https://ourArchive.ourCompany.com/projects/ThisProject/repos/data/raw/foo/bar.spec?at=refs%2Fheads%2FTheBranchOfInterest\' > bar.spec

This combination allowed me to download the one file I needed to build everything else.

回答19:

If you have edited a local version of a file and wish to revert to the original version maintained on the central server, this can be easily achieved using Git Extensions.

• Initially the file will be marked for commit, since it has been modified
• Select (double click) the file in the file tree menu
• The revision tree for the single file is listed.
• Select the top/HEAD of the tree and right click save as
• Save the file to overwrite the modified local version of the file
• The file now has the correct version and will no longer be marked for commit!

Easy!