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[FEATURE REQUEST] docker export to tar.gz #6916
Description
Activity
On moby side, it should be just a matter of plumbing the compression type in: https://github.com/moby/moby/blob/88e3f1c86461a796a9164d4c7dde72e77339eae4/daemon/export.go#L69
Not sure if we want to further extend the
exportoperation though.Is there a reason you can't use Buildkit (
docker build) to build and output the rootfs instead?docker export would be the quickest solution. I automated all the process. In my CI/CD, it periodically update the Linux distro container to docker hub weekly, in order to keep packages updated. Then, by docker create and docker export I can directly archive the latest image online.
If I should use docker build only for this purpose, it would be an additional command in the entire process, and it also takes time because of local building.
If docker export could have the mentioned feature, it would save time because I prevent local building and I dont need to do two separated compressions (1st to tar and then to tar.gz, considering also the installation of needed third party tools).
Is it just
create+exportdirectly without any steps in between? How do you build the image you run in the first place?If the image is built with
docker buildin the first place, you can just export a rootfs directy like:docker build . -o rootfsOr if you want to export an existing image you have, you could for example:
echo 'FROM alpine' | docker build - -o alpine-rootfs
Description
Currently
docker exportcommand allows to export a container as.tar.I use docker mainly for creating WSL images (Linux distros) for Microsoft Store and the process needs to work with a
.tar.gzarchive that is converted in an Appx package.Windows has not gzip included by default but only tar command.
To prevent the usage of gzip, there is no way to use only tar command to convert to gzip. It is not possible to first unarchive the tar archive and then compress them to tar.gz by tar command because the containers, if Linux based, have errors due to the structure of a Linux filesystem (that is inside the container).
To prevent this and also to separately install gzip, can you please implement a possibility to also export a container as
.tar.gz? It can also allow us to export containers in a compressed and less space-consuming archive.