From 2fef367e459023a40b3b6bd30db5ae61336586b5 Mon Sep 17 00:00:00 2001
From: Mikhail Klementev <jollheef@riseup.net>
Date: Sat, 30 Jun 2018 19:42:31 +0000
Subject: [PATCH] First useful solution

---
 .gitignore                          |  5 ++++-
 appvm.sh                            | 12 ++++++++++++
 base.nix => nix/base.nix            |  0
 tdesktop.nix => nix/tdesktop.nix    |  2 +-
 qemu/qcow2/.keep                    |  0
 qemu.template => qemu/qemu.template |  6 ++++--
 6 files changed, 21 insertions(+), 4 deletions(-)
 create mode 100755 appvm.sh
 rename base.nix => nix/base.nix (100%)
 rename tdesktop.nix => nix/tdesktop.nix (93%)
 create mode 100644 qemu/qcow2/.keep
 rename qemu.template => qemu/qemu.template (92%)

diff --git a/.gitignore b/.gitignore
index ba077a4..b0ce59b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,4 @@
-bin
+bin/*
+!bin/.keep
+qemu/qcow2/*
+!qemu/qcow2/.keep
diff --git a/appvm.sh b/appvm.sh
new file mode 100755
index 0000000..bbd02c8
--- /dev/null
+++ b/appvm.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+if [[ "$1" == "build" && "$2" != "" ]]; then
+    NIX_PATH=$NIX_PATH:. nix-build '<nixpkgs/nixos>' -A config.system.build.vm -I nixos-config=nix/${2}.nix || exit 1
+    NIX_SYSTEM=$(realpath result/system)
+    mkdir -p bin
+    sed "s;NIX_SYSTEM_PLACEHOLDER;${NIX_SYSTEM};" qemu/qemu.template > bin/appvm.${2}
+    sed -i "s;NAME_PLACEHOLDER;${2};" bin/appvm.${2}
+    chmod +x bin/appvm.${2}
+    unlink result
+else
+    echo "Usage: $0 build APPLICATION"
+fi
diff --git a/base.nix b/nix/base.nix
similarity index 100%
rename from base.nix
rename to nix/base.nix
diff --git a/tdesktop.nix b/nix/tdesktop.nix
similarity index 93%
rename from tdesktop.nix
rename to nix/tdesktop.nix
index 925708e..f4ce4d6 100644
--- a/tdesktop.nix
+++ b/nix/tdesktop.nix
@@ -2,7 +2,7 @@
 {
   imports = [
     <nixpkgs/nixos/modules/virtualisation/qemu-vm.nix>
-    <base.nix>
+    <nix/base.nix>
   ];
 
   environment.systemPackages = [ pkgs.tdesktop ];
diff --git a/qemu/qcow2/.keep b/qemu/qcow2/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/qemu.template b/qemu/qemu.template
similarity index 92%
rename from qemu.template
rename to qemu/qemu.template
index a9778f0..3cb36f2 100644
--- a/qemu.template
+++ b/qemu/qemu.template
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-NIX_DISK_IMAGE=$(readlink -f ${NIX_DISK_IMAGE:-./tdesktop.qcow2})
+NAME=NAME_PLACEHOLDER
+
+NIX_DISK_IMAGE=$(readlink -f ${NIX_DISK_IMAGE:-./${NAME}.qcow2})
 
 if ! test -e "$NIX_DISK_IMAGE"; then
     qemu-img create -f qcow2 "$NIX_DISK_IMAGE" 512M || exit 1
@@ -19,7 +21,7 @@ NIX_SYSTEM="NIX_SYSTEM_PLACEHOLDER"
 
 # Start QEMU.
 qemu-system-x86_64 -enable-kvm \
-    -name tdesktop \
+    -name NAME_PLACEHOLDER \
     -m 1024 \
     -smp 1 \
     -device virtio-rng-pci \