xvc file track

Purpose

xvc file track is used to register any kind of file to Xvc for tracking versions.

Synopsis

$ xvc file track --help
Add file and directories to Xvc

Usage: xvc file track [OPTIONS] [TARGETS]...

Arguments:
  [TARGETS]...
          Files/directories to track

Options:
      --recheck-method <RECHECK_METHOD>
          How to track the file contents in cache: One of copy, symlink, hardlink, reflink.
          
          Note: Reflink uses copy if the underlying file system doesn't support it.

      --no-commit
          Do not copy/link added files to the file cache

      --text-or-binary <TEXT_OR_BINARY>
          Calculate digests as text or binary file without checking contents, or by automatically. (Default: auto)

      --force
          Add targets even if they are already tracked

      --no-parallel
          Don't use parallelism

  -h, --help
          Print help (see a summary with '-h')

Examples

File tracking works only in Xvc repositories.

$ git init
...
$ xvc init

Let's create a directory tree for these examples.

$ xvc-test-helper create-directory-tree --directories 4 --files 3  --seed 20231021
$ tree
.
├── dir-0001
│   ├── file-0001.bin
│   ├── file-0002.bin
│   └── file-0003.bin
├── dir-0002
│   ├── file-0001.bin
│   ├── file-0002.bin
│   └── file-0003.bin
├── dir-0003
│   ├── file-0001.bin
│   ├── file-0002.bin
│   └── file-0003.bin
└── dir-0004
    ├── file-0001.bin
    ├── file-0002.bin
    └── file-0003.bin

5 directories, 12 files

By default, the command runs similar to git add and git commit.

You can track individual files.

$ xvc file track dir-0001/file-0001.bin

You can track directories with the same command.

$ xvc file track dir-0002/

You can specify more than one target in a single command.

$ xvc file track dir-0001/file-0002.bin dir-0001/file-0003.bin

When you track a file, Xvc moves the file to the cache directory under .xvc/ and connects the workspace file with the cached file. This connection is called rechecking and analogous to Git checkout. For example, the above commands create a directory tree under .xvc as follows:

$ tree .xvc/b3
.xvc/b3
├── 493
│   └── eeb
│       └── 6525ea5e94e1e760371108e4a525c696c773a774a4818e941fd6d1af79
│           └── 0.bin
├── ab3
│   └── 619
│       └── 814cae0456a5a291e4d5c8d339a8389630e476f9f9e8d3a09accc919f0
│           └── 0.bin
└── e51
    └── 7d6
        └── b9a3617fdcd96bd128142a39f1eca26ed77a338d2b93ba4921a0116c70
            └── 0.bin

10 directories, 3 files

There are different recheck (checkout) methods that Xvc connects the workspace file to the cache. The default method for this is copying the file to the workspace. This way a separate copy of the cache file is created in the workspace.

If you want to make this connection with symbolic links, you can specify it with --recheck-method option.

$ xvc file track --recheck-method symlink dir-0003/file-0001.bin
$ ls -l dir-0003/file-0001.bin
lrwxr-xr-x  1 [..] dir-0003/file-0001.bin -> [CWD]/.xvc/b3/e51/7d6/b9a3617fdcd96bd128142a39f1eca26ed77a338d2b93ba4921a0116c70/0.bin

You can also use --hardlink and --reflink options. Please see xvc file recheck reference for details.

$ xvc file track --recheck-method hardlink dir-0003/file-0002.bin
$ xvc file track --recheck-method reflink dir-0003/file-0003.bin
$ ls -l dir-0003/
total 16
lrwxr-xr-x  1 [..] file-0001.bin -> [CWD]/.xvc/b3/e51/7d6/b9a3617fdcd96bd128142a39f1eca26ed77a338d2b93ba4921a0116c70/0.bin
-r--r--r--  2 [..] file-0002.bin
-r--r--r--  1 [..] file-0003.bin

When you track a file in Xvc, it's automatically commit (carry-in) to the cache directory. If you want to postpone this operation and don't need a cached copy for a file, you can use --no-commit option. You can later use xvc file carry-in command to move these files to the repository cache.

$ xvc file track --no-commit --recheck-method symlink dir-0004/
$ ls -l dir-0004/
total 24
-rw-r--r--  1 [..] file-0001.bin
-rw-r--r--  1 [..] file-0002.bin
-rw-r--r--  1 [..] file-0003.bin

$ xvc file list dir-0004/
FS        [..] ab361981 ab361981 dir-0004/file-0003.bin
FS        [..] 493eeb65 493eeb65 dir-0004/file-0002.bin
FS        [..] e517d6b9 e517d6b9 dir-0004/file-0001.bin
Total #: 3 Workspace Size:        6006 Cached Size:        6006

You can carry-in (commit) these files to the cache with xvc file carry-in command. Note that, as the files are deduplicated, we need to use --force in carry-in command. This behavior may change in the future.

$ xvc file carry-in --force dir-0004/

$ ls -l dir-0004/
total 0
lrwxr-xr-x  1 [..] file-0001.bin -> [CWD]/.xvc/b3/e51/7d6/b9a3617fdcd96bd128142a39f1eca26ed77a338d2b93ba4921a0116c70/0.bin
lrwxr-xr-x  1 [..] file-0002.bin -> [CWD]/.xvc/b3/493/eeb/6525ea5e94e1e760371108e4a525c696c773a774a4818e941fd6d1af79/0.bin
lrwxr-xr-x  1 [..] file-0003.bin -> [CWD]/.xvc/b3/ab3/619/814cae0456a5a291e4d5c8d339a8389630e476f9f9e8d3a09accc919f0/0.bin

Xvc dedeuplicates the files in the cache. If you track a file that is already in the cache, it won't be moved to the cache again. It will be copied, linked from the same copy.

$ tree .xvc/b3
.xvc/b3
├── 493
│   └── eeb
│       └── 6525ea5e94e1e760371108e4a525c696c773a774a4818e941fd6d1af79
│           └── 0.bin
├── ab3
│   └── 619
│       └── 814cae0456a5a291e4d5c8d339a8389630e476f9f9e8d3a09accc919f0
│           └── 0.bin
└── e51
    └── 7d6
        └── b9a3617fdcd96bd128142a39f1eca26ed77a338d2b93ba4921a0116c70
            └── 0.bin

10 directories, 3 files

Caveats

• This command doesn't discriminate symbolic links or hardlinks. Links are followed and any broken links may cause errors.

• Under the hood, Xvc tracks only the files, not directories. Directories are considered as path collections. It doesn't matter if you track a directory or files in it separately.

Technical Details

• Detecting changes in files and directories employ different kinds of associated digests. If a file has different metadata digest, its content digest is calculated. If file's content digest has changed, the file is considered changed. A directory that contains different set of files, or files with changed content is considered changed.