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support container to container copy

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Implement container to container copy.  Previously data could only be
copied from/to the host.

Fixes: #7370
Co-authored-by: Mehul Arora <aroram18@mcmaster.ca>
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
This commit is contained in:
Mehul Arora
2021-06-19 11:27:24 +05:30
committed by Valentin Rothberg
parent b6c279be22
commit 6fe03b25ab
13 changed files with 352 additions and 26 deletions
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11
docs/source/markdown/podman-cp.1.md
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@ -9,10 +9,10 @@ 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.
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.
The CONTAINER can be a running or stopped container. The **src_path** or **dest_path** can be a file or directory.
The containers can be a running or stopped. 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., `/`).
@ -70,10 +70,9 @@ The default is *true*.
## ALTERNATIVES
Podman has much stronger capabilities than just `podman cp` to achieve copy files between host and container.
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
then just cp.
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.
@ -113,6 +112,8 @@ podman cp containerID:/myapp/ /myapp/
podman cp containerID:/home/myuser/. /home/myuser/
podman cp containerA:/myapp containerB:/yourapp
podman cp - containerID:/myfiles.tar.gz < myfiles.tar.gz
## SEE ALSO