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authorMehul Arora <aroram18@mcmaster.ca>2021-07-28 17:05:06 +0530
committerMehul Arora <aroram18@mcmaster.ca>2021-07-28 17:05:06 +0530
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[CI:DOCS] Update podman-cp manpage
Signed-off-by: Mehul Arora <aroram18@mcmaster.ca>
Diffstat (limited to 'docs/source')
-rw-r--r--docs/source/markdown/podman-cp.1.md97
1 files changed, 53 insertions, 44 deletions
diff --git a/docs/source/markdown/podman-cp.1.md b/docs/source/markdown/podman-cp.1.md
index e04542aa2..79edf26ed 100644
--- a/docs/source/markdown/podman-cp.1.md
+++ b/docs/source/markdown/podman-cp.1.md
@@ -9,112 +9,121 @@ podman\-cp - Copy files/folders between a container and the local filesystem
**podman container cp** [*options*] [*container*:]*src_path* [*container*:]*dest_path*
## DESCRIPTION
-Copy the contents of **src_path** to the **dest_path**. You can copy from the container's filesystem to the local machine or the reverse, from the local filesystem to the container or between two containers.
-If `-` is specified for either the SRC_PATH or DEST_PATH, you can also stream a tar archive from STDIN or to STDOUT.
+**podman cp** allows copying the contents of **src_path** to the **dest_path**. Files can be copied from a container to the local machine and vice versa or between two containers.
+If `-` is specified for either the `SRC_PATH` or `DEST_PATH`, one can also stream a tar archive from `STDIN` or to `STDOUT`.
-The containers can be a running or stopped. The **src_path** or **dest_path** can be a file or directory.
+The containers can be either running or stopped and the *src_path* or *dest_path* can be a file or directory.
-The **podman cp** command assumes container paths are relative to the container's root directory (i.e., `/`).
-
-This means supplying the initial forward slash is optional;
-
-The command sees **compassionate_darwin:/tmp/foo/myfile.txt** and **compassionate_darwin:tmp/foo/myfile.txt** as identical.
+*IMPORTANT: The **podman cp** command assumes container paths are relative to the container's root directory (`/`), which means supplying the initial forward slash is optional and therefore sees `compassionate_darwin:/tmp/foo/myfile.txt` and `compassionate_darwin:tmp/foo/myfile.txt` as identical.*
Local machine paths can be an absolute or relative value.
The command interprets a local machine's relative paths as relative to the current working directory where **podman cp** is run.
-Assuming a path separator of /, a first argument of **src_path** and second argument of **dest_path**, the behavior is as follows:
+Assuming a path separator of `/`, a first argument of **src_path** and second argument of **dest_path**, the behavior is as follows:
-**src_path** specifies a file
+**src_path** specifies a file:
- **dest_path** does not exist
- - the file is saved to a file created at **dest_path** (note that parent directory must exist)
+ - the file is saved to a file created at **dest_path** (note that parent directory must exist).
- **dest_path** exists and is a file
- - the destination is overwritten with the source file's contents
+ - the destination is overwritten with the source file's contents.
- **dest_path** exists and is a directory
- - the file is copied into this directory using the base name from **src_path**
+ - the file is copied into this directory using the base name from **src_path**.
-**src_path** specifies a directory
+**src_path** specifies a directory:
- **dest_path** does not exist
- - **dest_path** is created as a directory and the contents of the source directory are copied into this directory
+ - **dest_path** is created as a directory and the contents of the source directory are copied into this directory.
- **dest_path** exists and is a file
- - Error condition: cannot copy a directory to a file
+ - Error condition: cannot copy a directory to a file.
- **dest_path** exists and is a directory
- **src_path** ends with `/`
- - the source directory is copied into this directory
+ - the source directory is copied into this directory.
- **src_path** ends with `/.` (i.e., slash followed by dot)
- - the content of the source directory is copied into this directory
+ - the content of the source directory is copied into this directory.
The command requires **src_path** and **dest_path** to exist according to the above rules.
If **src_path** is local and is a symbolic link, the symbolic target, is copied by default.
-A colon (:) is used as a delimiter between CONTAINER and its path.
+A *colon* ( : ) is used as a delimiter between a container and its path, it can also be used when specifying paths to a **src_path** or **dest_path** on a local machine, for example, `file:name.txt`.
-You can also use : when specifying paths to a **src_path** or **dest_path** on a local machine, for example, `file:name.txt`.
+*IMPORTANT: while using a *colon* ( : ) in a local machine path, one must be explicit with a relative or absolute path, for example: `/path/to/file:name.txt` or `./file:name.txt`*
-If you use a : in a local machine path, you must be explicit with a relative or absolute path, for example:
- `/path/to/file:name.txt` or `./file:name.txt`
-
-Using `-` as the *src_path* streams the contents of STDIN as a tar archive. The command extracts the content of the tar to the *DEST_PATH* in the container. In this case, *dest_path* must specify a directory. Using `-` as the *dest_path* streams the contents of the resource (can be a directory) as a tar archive to STDOUT.
+Using `-` as the **src_path** streams the contents of `STDIN` as a tar archive. The command extracts the content of the tar to the `DEST_PATH` in the container. In this case, **dest_path** must specify a directory. Using `-` as the **dest_path** streams the contents of the resource (can be a directory) as a tar archive to `STDOUT`.
Note that `podman cp` ignores permission errors when copying from a running rootless container. The TTY devices inside a rootless container are owned by the host's root user and hence cannot be read inside the container's user namespace.
## OPTIONS
-#### **--archive**, **-a**
+#### **--archive**, **-a**=**true** | *false*
Archive mode (copy all uid/gid information).
-When set to true, files copied to a container will have changed ownership to the primary uid/gid of the container.
+When set to true, files copied to a container will have changed ownership to the primary UID/GID of the container.
When set to false, maintain uid/gid from archive sources instead of changing them to the primary uid/gid of the destination container.
-The default is *true*.
+The default is **true**.
## ALTERNATIVES
Podman has much stronger capabilities than just `podman cp` to achieve copying files between the host and containers.
-Using standard podman-mount and podman-umount takes advantage of the entire linux tool chain, rather than just cp.
-
-If a user wants to copy contents out of a container or into a container, they can execute a few simple commands.
+Using standard **[podman-mount(1)](podman-mount.1.md)** and **[podman-unmount(1)](podman-unmount.1.md)** takes advantage of the entire linux tool chain, rather than just cp.
-You can copy from the container's file system to the local machine or the reverse, from the local filesystem to the container.
+copying contents out of a container or into a container, can be achieved with a few simple commands. For example:
-If you want to copy the /etc/foobar directory out of a container and onto /tmp on the host, you could execute the following commands:
+To copy the `/etc/foobar` directory out of a container and onto `/tmp` on the host, the following commands can be executed:
mnt=$(podman mount CONTAINERID)
cp -R ${mnt}/etc/foobar /tmp
podman umount CONTAINERID
-If you want to untar a tar ball into a container, you can execute these commands:
+To untar a tar ball into a container, following commands can be executed:
mnt=$(podman mount CONTAINERID)
tar xf content.tgz -C ${mnt}
podman umount CONTAINERID
-One last example, if you want to install a package into a container that
-does not have dnf installed, you could execute something like:
+To install a package into a container that
+does not have dnf installed, following commands can be executed:
mnt=$(podman mount CONTAINERID)
dnf install --installroot=${mnt} httpd
chroot ${mnt} rm -rf /var/log/dnf /var/cache/dnf
podman umount CONTAINERID
-This shows that using `podman mount` and `podman umount` you can use all of the
+By using `podman mount` and `podman unmount`, one can use all of the
standard linux tools for moving files into and out of containers, not just
the cp command.
-## EXAMPLE
+## EXAMPLES
-podman cp /myapp/app.conf containerID:/myapp/app.conf
+- Copy a file from host to a container.
+ ```
+ podman cp /myapp/app.conf containerID:/myapp/app.conf
+ ```
-podman cp /home/myuser/myfiles.tar containerID:/tmp
+- Copy a file from a container to a directory on another container.
+ ```
+ podman cp containerID1:/myfile.txt containerID2:/tmp
+ ```
-podman cp containerID:/myapp/ /myapp/
+- Copy a directory on a container to a directory on the host.
+ ```
+ podman cp containerID:/myapp/ /myapp/
+ ```
-podman cp containerID:/home/myuser/. /home/myuser/
+- Copy the contents of a directory on a container to a directory on the host.
+ ```
+ podman cp containerID:/home/myuser/. /home/myuser/
+ ```
-podman cp containerA:/myapp containerB:/yourapp
+- Copy a directory on a container into a directory on another.
+ ```
+ podman cp containerA:/myapp containerB:/yourapp
+ ```
-podman cp - containerID:/myfiles.tar.gz < myfiles.tar.gz
+- Stream a tar archive from `STDIN` to a container.
+ ```
+ podman cp - containerID:/myfiles.tar.gz < myfiles.tar.gz
+ ```
## SEE ALSO
-podman(1), podman-mount(1), podman-umount(1)
+**[podman(1)](podman.1.md)**, **[podman-mount(1)](podman-mount.1.md)**, **[podman-unmount(1)](podman-unmount.1.md)**