feat: scripts/vminstall.sh installs an ssh-ready test VM unattended; TESTPLAN.md; vm-install skill

share/vminstall-post.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+# Runs inside the freshly installed system (arch-chroot, from
+# vminstall-live.sh): what guest-ssh-setup.sh and the old manual steps did,
+# so the VM is ssh-ready without touching it: sshd with the host's key,
+# passwordless sudo, the test autologin into Plasma, tmux and shellcheck.
+set -euo pipefail
+# shellcheck disable=SC1091
+. /root/vminstall.env
+
+echo "$VM_HOSTNAME" > /etc/hostname
+pacman -S --needed --noconfirm openssh tmux shellcheck
+systemctl enable sshd
+
+home="/home/$VM_USER"
+install -d -m 700 -o "$VM_USER" -g "$VM_USER" "$home/.ssh"
+printf '%s\n' "$VM_PUBKEY" > "$home/.ssh/authorized_keys"
+chown "$VM_USER:$VM_USER" "$home/.ssh/authorized_keys"
+chmod 600 "$home/.ssh/authorized_keys"
+
+# Test VM only: the host drives it without a password.
+echo "$VM_USER ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/99-test-vm
+chmod 440 /etc/sudoers.d/99-test-vm
+
+# Log straight into Plasma (gamescope doesn't render in the VM). The
+# scripts expect plasma-login-manager, like a CachyOS install from Calamares.
+pacman -Q plasma-login-manager >/dev/null 2>&1 || pacman -S --needed --noconfirm plasma-login-manager
+systemctl disable sddm.service 2>/dev/null || true
+systemctl enable plasmalogin.service
+mkdir -p /etc/plasmalogin.conf.d
+printf '[Autologin]\nUser=%s\nSession=plasma.desktop\n' "$VM_USER" > /etc/plasmalogin.conf.d/00-test-autologin.conf
+
+# cachyos-installer's limine.conf has no default_entry: entry 1 is the
+# "CachyOS" folder, so the first boot waits in the menu. 2 is its first
+# kernel (linux-cachyos); limine-update keeps the line.
+if [[ -f /boot/limine.conf ]] && ! grep -q '^default_entry:' /boot/limine.conf; then
+    sed -i 's/^timeout: .*/&\ndefault_entry: 2/' /boot/limine.conf
+fi
+
+# English everywhere, whatever the live ISO picked.
+echo 'LANG=en_US.UTF-8' > /etc/locale.conf
+
+# mirror5.krfoss.org served broken signatures; skip it (vmreset.sh does too).
+for f in /etc/pacman.d/*mirrorlist*; do sed -i '/krfoss/s/^Server/#Server/' "$f"; done
+echo "Test VM setup done: $VM_USER@$VM_HOSTNAME"