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iso-image: Use unionfs-fuse instead of aufs

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This commit is contained in:
Shea Levy 2012-12-16 11:31:52 -05:00
parent 90e825481d
commit be4f69519b
2 changed files with 26 additions and 19 deletions
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41
modules/installer/cd-dvd/iso-image.nix
View file

@ -192,34 +192,41 @@ in
options = "loop";
};
# We need squashfs in the initrd to mount the compressed Nix store,
# and aufs to make the root filesystem appear writable.
boot.extraModulePackages =
if config.boot.kernelPackages.aufs == null then
abort "This kernel doesn't have aufs enabled"
else
[ config.boot.kernelPackages.aufs ];
boot.initrd.availableKernelModules = [ "squashfs" "iso9660" ];
boot.initrd.availableKernelModules = [ "aufs" "squashfs" "iso9660" ];
boot.initrd.kernelModules = [ "loop" ];
boot.initrd.kernelModules = [ "loop" "fuse" ];
boot.kernelModules = pkgs.stdenv.lib.optional config.isoImage.makeEfiBootable "efivars";
# Need unionfs-fuse
boot.initrd.extraUtilsCommands = ''
cp -v ${pkgs.fuse}/lib/libfuse* $out/lib
cp -v ${pkgs.unionfs-fuse}/bin/unionfs $out/bin
'';
# In stage 1, mount a tmpfs on top of / (the ISO image) and
# /nix/store (the squashfs image) to make this a live CD.
boot.initrd.postMountCommands =
''
mkdir /mnt-root-tmpfs
mount -t tmpfs -o "mode=755" none /mnt-root-tmpfs
# Hacky!!! fuse hard-codes the path to mount
mkdir -p /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.utillinux.name}/bin
ln -s $(which mount) /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.utillinux.name}/bin
ln -s $(which umount) /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.utillinux.name}/bin
mkdir -p /unionfs-chroot$targetRoot
mount --rbind $targetRoot /unionfs-chroot$targetRoot
mkdir /unionfs-chroot/mnt-root-tmpfs
mount -t tmpfs -o "mode=755" none /unionfs-chroot/mnt-root-tmpfs
mkdir /mnt-root-union
mount -t aufs -o dirs=/mnt-root-tmpfs=rw:$targetRoot=ro none /mnt-root-union
unionfs -o allow_other,cow,chroot=/unionfs-chroot /mnt-root-tmpfs=RW:$targetRoot=RO /mnt-root-union
oldTargetRoot=$targetRoot
targetRoot=/mnt-root-union
mkdir /mnt-store-tmpfs
mount -t tmpfs -o "mode=755" none /mnt-store-tmpfs
mkdir -p $targetRoot/nix/store
mount -t aufs -o dirs=/mnt-store-tmpfs=rw:/mnt-root/nix/store=ro none /mnt-root-union/nix/store
mkdir /unionfs-chroot/mnt-store-tmpfs
mount -t tmpfs -o "mode=755" none /unionfs-chroot/mnt-store-tmpfs
mkdir -p $oldTargetRoot/nix/store
unionfs -o allow_other,cow,nonempty,chroot=/unionfs-chroot /mnt-store-tmpfs=RW:$oldTargetRoot/nix/store=RO /mnt-root-union/nix/store
'';
# Closures to be copied to the Nix store on the CD, namely the init

4
modules/system/boot/stage-1-init.sh
View file

@ -332,8 +332,8 @@ exec 3>&-
udevadm control --exit || true
# Kill any remaining processes, just to be sure we're not taking any
# with us into stage 2.
pkill -9 -v 1
# with us into stage 2. unionfs-fuse mounts require the unionfs process.
pkill -9 -v '(1|unionfs)'
if test -n "$debug1mounts"; then fail; fi