# Ideas

## Usability

* Docs (tutorial and manpage).

* Makefile and debian package.

* Patch for spice-client-gtk for menuless windows (spicec usecase).

* Systemd service for a single VM.

* Shell completions.

* Support for other Spice clients such as [Remmina](https://remmina.org).

* Support for multiple source/targets pairs (analogous to `shared_folders`) at:
  * `provision_rsync`

* Be more distro-agnostic, making any debian-specific routine as a separate function.

## Virtualization

* Config option to [disable
  networking](https://wiki.qemu.org/Documentation/Networking#How_to_disable_network_completely),
  passing `-net none`.

* [Nested virtualization](http://www.rdoxenham.com/?p=275)
  ([1](https://wiki.archlinux.org/index.php/KVM#Nested_virtualization),
  [2](https://ladipro.wordpress.com/2017/02/24/running-hyperv-in-kvm-guest/)).

## Workflow

* Continuous Integration script (kvmx-ci):
  * For schedule jobs (like cron).
  * Pull from remote repository and check source integrity.
  * Automatic VM (re-)creation and/or provisioning.
  * Logging.
  * Status report.

* Test suite for kvmx itself.

* Option `provision_always` to provision whenever a guest is started.

* A qubes-like behavior: guest configured:
  * Option 1:
    * With backing file and a basebox as a TemplateVM, using a `template_vm`
      config working along with `base` abd `backing_file`.
    * To reinitialize de backing file at every restart.
    * Guest won't start if the basebox is running.
  * Option 2:
    * Starting the VM using -snapshot param.
    * Setting the $image to the same as the basebox.
  * Use `$shared_folders` to mount custom data into the guest, allowing for
    specific /home/user contents.

* KVMX lifecycle enhancements:
  * kvmx recycle <vm-name> # kvmx stop/destroy/up/provision
  * kvmx mount   <vm-name> <host-folder> <guest-mountpoint> # live 9p mounting
  * kvmx run     <vm-name> <command-file> # uploads a script as a temp file in the guest and runs it
  * kvmx upgrade <vm-name> # upgrades via SSH using a pre-defined upgrade command in the kvmxfile,
                           # start the VM if needed, skip if no command is set (skip when backing_file=1?)

* KVMX disposable enhancements:
  * kvmx disposable      <vm-name> [command]
  * kvmx disposable-run  <vm-name> <command-file>
  * kvmx disposable-name <vm-name> <temporary-name>
  * kvmx mat             <vm-name> <filename>
  * kvmx pdf-cleaner     <vm-name> <filename>
  * kvmx clamav          <vm-name> <folder|file>

## Folder sharing

* Try to umount all sshfs volumes in the host.

* Remount 9p shared folders and reinitialize spice-vdagent upon resume from
  disk [see possible bug](https://bugzilla.redhat.com/show_bug.cgi?id=1333072).

* Alternative folder sharing support:
  * NFS, SMB.
  * Or even [SSH to a server](https://superuser.com/questions/831659/mount-a-local-directory-to-a-remote-ssh-server)).

## Image handling

* Support for other OSes like Arch Linux, Gentoo, Alpine, CentOS and NixOS.

* Integration with [image-bootstrap](https://github.com/hartwork/image-bootstrap).

* LVM support at `kvmx-create`, with optional LUKS support for the whole volume.

* Non-superuser support for building images on `kvmx-create`, relying on a method like the following:
  * https://unix.stackexchange.com/questions/32008/how-to-mount-an-image-file-without-root-permission
  * https://wiki.debian.org/ManipulatingISOs
  * https://github.com/libfuse/libfuse/wiki/Filesystems
  * https://packages.debian.org/search?suite=default&section=all&arch=any&searchon=all&keywords=fuse

* Additional way to handle missing image on `kvmx up` by spawning `kvmx_install` instead of `kvmx-create`.

* Fix isolinux support:
  * http://www.syslinux.org/wiki/index.php?title=Development/Testing
  * http://linux-kernel-driver.blogspot.com.br/2009/06/linux-kernel-development-using.html
  * https://bbs.archlinux.org/viewtopic.php?id=177299

* Image resize action, doing something like this, thanks to
  https://ahelpme.com/linux/online-resize-of-a-root-ext4-file-system-increase-the-space/

    # poweroff
    kvmx poweroff $guest

    # resize image
    qemu-img resize `kvmx list_image $guest` +5G

    # power up
    kvmx up $guest

    # ensure parted is installed
    sudo apt-get install -y parted

    # resize virtual machine root fs - while the partition is mounted!
    # this parted command currently need to be done manually
    #echo resizepart 2 -1 | kvmx ssh $guest sudo parted /dev/vda

    # See https://unix.stackexchange.com/questions/190317/gnu-parted-resizepart-in-script#202872
    #     https://bugs.launchpad.net/ubuntu/+source/parted/+bug/1270203
    #     https://techtitbits.com/2018/12/using-parteds-resizepart-non-interactively-on-a-busy-partition/
    #     https://serverfault.com/questions/870594/resize-partition-to-maximum-using-parted-in-non-interactive-mode
    kvmx ssh $guest sudo parted /dev/vda resizepart 2 -1 Yes

    kvmx ssh $guest sudo resize2fs /dev/vda2
    kvmx ssh $guest sudo touch /forcefsck
    kvmx ssh $guest sudo poweroff

## Audio fixes to avoid crackling on input

Implement an option to reduce crackling on sound input.

See:

* https://stackoverflow.com/questions/32193050/qemu-pulseaudio-and-bad-quality-of-sound#35998501
* https://www.reddit.com/r/VFIO/comments/542bw1/ha_got_rid_of_the_pulse_audio_crackling/
* https://www.reddit.com/r/VFIO/comments/ibmjs3/finally_fixed_crackling_audio_when_passing/
* https://www.reddit.com/r/VFIO/comments/746t4h/getting_rid_of_audio_crackling_once_and_for_all/
* https://www.reddit.com/r/VFIO/comments/8aqju8/audio_crackling_when_routing_output_to_pulseaudio/

Fix:

    export QEMU_AUDIO_DRV="pa"
    export QEMU_PA_SAMPLES="8192"
    export QEMU_AUDIO_TIMER_PERIOD="99"

## Simultaneous clients connections

Implement the following:

    export SPICE_DEBUG_ALLOW_MC=1

For explanation, check https://www.spice-space.org/multiple-clients.html