anaconda: Add bootc installation via anaconda

Implement bootc container installation using anaconda as the installation
engine with kickstart processing. Uses the ephemeral VM infrastructure to
run anaconda in an isolated environment with proper access to block devices
and container storage.

Key implementation details:

- User must provide kickstart file with partitioning and locale settings
- bcvk injects ostreecontainer directive with --transport=containers-storage
- Inject %pre script to configure container storage with host overlay
- Inject %post script running 'bootc switch --mutate-in-place' to repoint
  the installed system to the registry image (for bootc upgrade to work)
- Handle SSH exit code 255 as success when VM powers off after installation
- Share disk creation logic via qemu_img::create_disk()

Options:
- --kickstart (-k): Required kickstart file path
- --target-imgref: Registry image for bootc origin (defaults to image arg)
- --no-repoint: Skip %post repointing if user handles it themselves

The anaconda installer container (localhost/anaconda-bootc) is based on
fedora-bootc with anaconda-tui installed. Build instructions in
containers/anaconda-bootc/.

Assisted-by: OpenCode (claude-opus-4-5@20251101)
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

containers/anaconda-bootc/Dockerfile

@@ -0,0 +1,24 @@
+# Anaconda installer container for bcvk
+#
+# This container provides anaconda for installing bootc container images
+# using kickstart files. It's designed to run as an ephemeral VM that
+# boots into anaconda.target.
+#
+# Build: podman build -t localhost/anaconda-bootc:latest .
+
+FROM quay.io/fedora/fedora-bootc:42
+
+# Install anaconda and required packages
+COPY packages.txt /tmp/packages.txt
+RUN dnf install -y $(grep -v '^#' /tmp/packages.txt | tr '\n' ' ') && \
+    dnf clean all && \
+    rm /tmp/packages.txt
+
+# Install bcvk setup service that runs before anaconda
+COPY bcvk-anaconda-setup.service /usr/lib/systemd/system/bcvk-anaconda-setup.service
+COPY bcvk-anaconda-setup.sh /usr/libexec/bcvk-anaconda-setup.sh
+RUN chmod +x /usr/libexec/bcvk-anaconda-setup.sh
+
+# Set anaconda.target as default and enable our setup service
+RUN systemctl set-default anaconda.target && \
+    systemctl enable bcvk-anaconda-setup.service

containers/anaconda-bootc/README.md

@@ -0,0 +1,97 @@
+# Anaconda Installer Container for bcvk
+
+This container provides the anaconda installer for installing bootc container
+images using kickstart files. It boots into `anaconda.target` and uses the
+upstream anaconda systemd services.
+
+## Overview
+
+The container is based on `quay.io/fedora/fedora-bootc:42` with anaconda-tui
+installed. It boots directly into `anaconda.target` and uses the upstream
+`anaconda-direct.service` with a bcvk setup service that runs beforehand.
+
+## Building
+
+```bash
+cd containers/anaconda-bootc
+podman build -t localhost/anaconda-bootc:latest .
+```
+
+## How It Works
+
+1. bcvk creates a target disk and generates a kickstart file
+2. bcvk starts the VM with:
+   - Host container storage mounted read-only via virtiofs
+   - Kickstart file mounted via virtiofs at `/run/virtiofs-mnt-kickstart/`
+   - Target disk attached via virtio-blk
+   - Kernel args: `inst.notmux inst.ks=file:///run/virtiofs-mnt-kickstart/anaconda.ks`
+3. The VM boots into `anaconda.target`
+4. `bcvk-anaconda-setup.service` runs first to:
+   - Mount virtiofs shares for container storage and kickstart
+   - Configure `/etc/containers/storage.conf` with additionalImageStores
+5. Upstream `anaconda-direct.service` runs anaconda (triggered by `inst.notmux`)
+6. Kickstart `poweroff` directive powers off the VM after anaconda completes
+
+## Integration with Upstream Anaconda
+
+This container leverages upstream anaconda systemd infrastructure:
+
+| Component | Source | Purpose |
+|-----------|--------|---------|
+| `anaconda.target` | Upstream | Default boot target for installation |
+| `anaconda-direct.service` | Upstream | Runs anaconda without tmux |
+| `bcvk-anaconda-setup.service` | bcvk | Sets up virtiofs mounts before anaconda (conditional on `bcvk.anaconda` kernel arg) |
+
+## Kickstart Requirements
+
+The user provides a kickstart with partitioning and locale settings.
+bcvk injects:
+- `ostreecontainer --transport=containers-storage --url=<image>`
+- `%post` script to repoint bootc origin to the registry (unless `--no-repoint`)
+
+**Important**: The target disk is available at `/dev/disk/by-id/virtio-output`.
+bcvk also attaches a swap disk, so use `ignoredisk` to target the correct disk.
+
+Example kickstart for BIOS boot:
+```kickstart
+text
+lang en_US.UTF-8
+keyboard us
+timezone UTC --utc
+network --bootproto=dhcp --activate
+
+# Target only the output disk
+ignoredisk --only-use=/dev/disk/by-id/virtio-output
+
+zerombr
+clearpart --all --initlabel
+
+# Create required boot partitions (biosboot + /boot)
+reqpart --add-boot
+part / --fstype=xfs --grow
+
+rootpw --lock
+poweroff
+```
+
+## Installed Packages
+
+See `packages.txt` for the full list. Key packages:
+- **anaconda-tui**: Text-mode anaconda installer
+- **pykickstart**: Kickstart file processing  
+- **Disk tools**: parted, gdisk, lvm2, cryptsetup
+- **Filesystem tools**: e2fsprogs, xfsprogs, btrfs-progs
+- **Container tools**: skopeo (bootc is in base image)
+
+## Debugging
+
+If installation fails, check the VM console output or journal:
+```bash
+# Run with console output
+bcvk anaconda install --console ...
+
+# Inside VM, check logs
+journalctl -u bcvk-anaconda-setup
+journalctl -u anaconda-direct
+cat /tmp/anaconda.log
+```

containers/anaconda-bootc/bcvk-anaconda-setup.service

@@ -0,0 +1,18 @@
+[Unit]
+Description=bcvk container storage setup for anaconda
+# Run before anaconda starts, after basic system is up and target disk is available
+Before=anaconda-direct.service anaconda.service
+After=basic.target dev-disk-by\x2did-virtio\x2doutput.device
+Requires=dev-disk-by\x2did-virtio\x2doutput.device
+# Only run in bcvk anaconda environment (bcvk passes this kernel arg)
+ConditionKernelCommandLine=bcvk.anaconda
+
+[Service]
+Type=oneshot
+ExecStart=/usr/libexec/bcvk-anaconda-setup.sh
+RemainAfterExit=yes
+StandardOutput=journal+console
+StandardError=journal+console
+
+[Install]
+WantedBy=anaconda.target

containers/anaconda-bootc/bcvk-anaconda-setup.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+# bcvk anaconda setup script
+#
+# This script runs before anaconda to set up:
+# - virtiofs mounts for host container storage and kickstart
+# - container storage configuration for additionalImageStores
+#
+# Anaconda itself is run by the upstream anaconda-direct.service
+set -euo pipefail
+
+echo "bcvk: Setting up container storage for anaconda..."
+
+# Mount host container storage via virtiofs
+AIS=/run/virtiofs-mnt-hoststorage
+if ! mountpoint -q "${AIS}" 2>/dev/null; then
+    mkdir -p "${AIS}"
+    mount -t virtiofs mount_hoststorage "${AIS}" || {
+        echo "bcvk: ERROR: Failed to mount host container storage"
+        exit 1
+    }
+fi
+
+# Mount kickstart directory via virtiofs
+KS_DIR=/run/virtiofs-mnt-kickstart
+if ! mountpoint -q "${KS_DIR}" 2>/dev/null; then
+    mkdir -p "${KS_DIR}"
+    mount -t virtiofs mount_kickstart "${KS_DIR}" || {
+        echo "bcvk: ERROR: Failed to mount kickstart directory"
+        exit 1
+    }
+fi
+
+# Configure containers to use host storage as additional image store
+mkdir -p /etc/containers
+cat > /etc/containers/storage.conf << 'EOF'
+[storage]
+driver = "overlay"
+[storage.options]
+additionalimagestores = ["/run/virtiofs-mnt-hoststorage"]
+EOF
+
+# Verify kickstart exists
+if [ ! -f "${KS_DIR}/anaconda.ks" ]; then
+    echo "bcvk: ERROR: Kickstart not found at ${KS_DIR}/anaconda.ks"
+    exit 1
+fi
+
+# Copy kickstart to where anaconda expects it
+# Anaconda looks for /run/install/ks.cfg when inst.ks is specified
+mkdir -p /run/install
+cp "${KS_DIR}/anaconda.ks" /run/install/ks.cfg
+echo "bcvk: Installed kickstart to /run/install/ks.cfg"
+
+echo "bcvk: Setup complete. Kickstart: ${KS_DIR}/anaconda.ks"

containers/anaconda-bootc/packages.txt

@@ -0,0 +1,19 @@
+# Anaconda installer packages
+anaconda-tui
+python3-kickstart
+pykickstart
+
+# Disk tools
+parted
+gdisk
+lvm2
+cryptsetup
+
+# Filesystem tools
+e2fsprogs
+xfsprogs
+btrfs-progs
+dosfstools
+
+# Container tools (bootc is in base image)
+skopeo

crates/integration-tests/src/main.rs

@@ -15,8 +15,10 @@ pub(crate) use integration_tests::{
 };
 
 mod tests {
+    pub mod anaconda_install;
     pub mod libvirt_base_disks;
     pub mod libvirt_port_forward;
+    pub mod libvirt_run_anaconda;
     pub mod libvirt_upload_disk;
     pub mod libvirt_verb;
     pub mod mount_feature;