91 lines
3.9 KiB
Markdown
91 lines
3.9 KiB
Markdown
<!--[metadata]>
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+++
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title = "cp"
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description = "The cp command description and usage"
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keywords = ["copy, container, files, folders"]
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[menu.main]
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parent = "smn_cli"
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+++
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<![end-metadata]-->
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# cp
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Usage: docker cp [OPTIONS] CONTAINER:PATH LOCALPATH|-
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docker cp [OPTIONS] LOCALPATH|- CONTAINER:PATH
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Copy files/folders between a container and the local filesystem
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--help=false Print usage
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In the first synopsis form, the `docker cp` utility copies the contents of
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`PATH` from the filesystem of `CONTAINER` to the `LOCALPATH` (or stream as
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a tar archive to `STDOUT` if `-` is specified).
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In the second synopsis form, the contents of `LOCALPATH` (or a tar archive
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streamed from `STDIN` if `-` is specified) are copied from the local machine to
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`PATH` in the filesystem of `CONTAINER`.
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You can copy to or from either a running or stopped container. The `PATH` can
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be a file or directory. The `docker cp` command assumes all `CONTAINER:PATH`
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values are relative to the `/` (root) directory of the container. This means
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supplying the initial forward slash is optional; The command sees
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`compassionate_darwin:/tmp/foo/myfile.txt` and
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`compassionate_darwin:tmp/foo/myfile.txt` as identical. If a `LOCALPATH` value
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is not absolute, is it considered relative to the current working directory.
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Behavior is similar to the common Unix utility `cp -a` in that directories are
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copied recursively with permissions preserved if possible. Ownership is set to
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the user and primary group on the receiving end of the transfer. For example,
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files copied to a container will be created with `UID:GID` of the root user.
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Files copied to the local machine will be created with the `UID:GID` of the
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user which invoked the `docker cp` command.
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Assuming a path separator of `/`, a first argument of `SRC_PATH` and second
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argument of `DST_PATH`, the behavior is as follows:
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- `SRC_PATH` specifies a file
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- `DST_PATH` does not exist
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- the file is saved to a file created at `DST_PATH`
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- `DST_PATH` does not exist and ends with `/`
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- Error condition: the destination directory must exist.
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- `DST_PATH` exists and is a file
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- the destination is overwritten with the contents of the source file
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- `DST_PATH` exists and is a directory
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- the file is copied into this directory using the basename from
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`SRC_PATH`
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- `SRC_PATH` specifies a directory
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- `DST_PATH` does not exist
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- `DST_PATH` is created as a directory and the *contents* of the source
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directory are copied into this directory
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- `DST_PATH` exists and is a file
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- Error condition: cannot copy a directory to a file
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- `DST_PATH` exists and is a directory
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- `SRC_PATH` does not end with `/.`
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- the source directory is copied into this directory
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- `SRC_PATH` does end with `/.`
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- the *content* of the source directory is copied into this
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directory
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The command requires `SRC_PATH` and `DST_PATH` to exist according to the above
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rules. If `SRC_PATH` is local and is a symbolic link, the symbolic link, not
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the target, is copied.
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A colon (`:`) is used as a delimiter between `CONTAINER` and `PATH`, but `:`
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could also be in a valid `LOCALPATH`, like `file:name.txt`. This ambiguity is
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resolved by requiring a `LOCALPATH` with a `:` to be made explicit with a
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relative or absolute path, for example:
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`/path/to/file:name.txt` or `./file:name.txt`
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It is not possible to copy certain system files such as resources under
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`/proc`, `/sys`, `/dev`, and mounts created by the user in the container.
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Using `-` as the first argument in place of a `LOCALPATH` will stream the
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contents of `STDIN` as a tar archive which will be extracted to the `PATH` in
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the filesystem of the destination container. In this case, `PATH` must specify
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a directory.
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Using `-` as the second argument in place of a `LOCALPATH` will stream the
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contents of the resource from the source container as a tar archive to
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`STDOUT`.
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