Mount unionfs-fuse filesystems using the normal fileSystems option
This commit is contained in:
Eelco Dolstra
parent
d45dcf348e
commit
e68b0c7f5f
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@ -191,6 +191,8 @@ in
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noCheck = true;
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};
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# In stage 1, mount a tmpfs on top of /nix/store (the squashfs
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# image) to make this a live CD.
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fileSystems."/nix/.ro-store" =
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{ fsType = "squashfs";
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device = "/iso/nix-store.squashfs";
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@ -204,18 +206,16 @@ in
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neededForBoot = true;
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};
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fileSystems."/nix/store" =
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{ fsType = "unionfs-fuse";
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device = "unionfs";
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options = "allow_other,cow,nonempty,chroot=/mnt-root,max_files=32768,hide_meta_files,dirs=/nix/.rw-store=rw:/nix/.ro-store=ro";
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};
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boot.initrd.availableKernelModules = [ "squashfs" "iso9660" ];
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boot.initrd.kernelModules = [ "loop" ];
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# In stage 1, mount a tmpfs on top of /nix/store (the squashfs
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# image) to make this a live CD.
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boot.initrd.postMountCommands =
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''
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mkdir -p $targetRoot/nix/store
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unionfs -o allow_other,cow,nonempty,chroot=$targetRoot,max_files=32768 /nix/.rw-store=RW:/nix/.ro-store=RO $targetRoot/nix/store
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'';
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# Closures to be copied to the Nix store on the CD, namely the init
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# script and the top-level system configuration directory.
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isoImage.storeContents =
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@ -311,8 +311,8 @@ in
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'';
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# Add vfat support to the initrd to enable people to copy the
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# contents of the CD to a bootable USB stick. Need unionfs-fuse for union mounts
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boot.initrd.supportedFilesystems = [ "vfat" "unionfs-fuse" ];
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# contents of the CD to a bootable USB stick.
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boot.initrd.supportedFilesystems = [ "vfat" ];
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};
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@ -4,7 +4,8 @@ targetRoot=/mnt-root
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console=tty1
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export LD_LIBRARY_PATH=@extraUtils@/lib
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export PATH=@extraUtils@/bin:@extraUtils@/sbin
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export PATH=@extraUtils@/bin
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ln -s @extraUtils@/bin /bin
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fail() {
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@ -262,6 +263,13 @@ mountFS() {
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checkFS "$device" "$fsType"
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# Create backing directories for unionfs-fuse.
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if [ "$fsType" = unionfs-fuse ]; then
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for i in $(IFS=:; echo ${options##*,dirs=}); do
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mkdir -m 0700 -p /mnt-root"${i%=*}"
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done
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fi
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echo "mounting $device on $mountPoint..."
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mkdir -p "/mnt-root$mountPoint" || true
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@ -35,6 +35,7 @@ let
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}
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''
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mkdir -p $out/bin $out/lib
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ln -s $out/bin $out/sbin
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# Copy what we need from Glibc.
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cp -pv ${pkgs.glibc}/lib/ld*.so.? $out/lib
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@ -46,11 +47,10 @@ let
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cp -pv ${pkgs.gcc.gcc}/lib*/libgcc_s.so.* $out/lib
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# Copy BusyBox.
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cp -rvd ${pkgs.busybox}/{bin,sbin} $out/
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chmod -R u+w $out
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cp -pvd ${pkgs.busybox}/bin/* ${pkgs.busybox}/sbin/* $out/bin/
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# Copy some utillinux stuff.
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cp -v ${pkgs.utillinux}/sbin/blkid $out/bin
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cp -vf ${pkgs.utillinux}/sbin/blkid $out/bin
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cp -pdv ${pkgs.utillinux}/lib/libblkid*.so.* $out/lib
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cp -pdv ${pkgs.utillinux}/lib/libuuid*.so.* $out/lib
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@ -73,7 +73,7 @@ let
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# Copy modprobe.
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cp -v ${pkgs.kmod}/bin/kmod $out/bin/
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ln -s kmod $out/bin/modprobe
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ln -sf kmod $out/bin/modprobe
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${config.boot.initrd.extraUtilsCommands}
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@ -68,7 +68,7 @@ let
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config = {
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mountPoint = mkDefault name;
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device = mkIf (config.fsType == "tmpfs") config.fsType;
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device = mkIf (config.fsType == "tmpfs") (mkDefault config.fsType);
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};
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};
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@ -2,14 +2,21 @@
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{
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config = lib.mkMerge [
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(lib.mkIf (lib.any (fs: fs == "unionfs-fuse") config.boot.initrd.supportedFilesystems) {
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boot.initrd.kernelModules = [ "fuse" ];
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boot.initrd.extraUtilsCommands = ''
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cp -v ${pkgs.fuse}/lib/libfuse* $out/lib
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cp -v ${pkgs.fuse}/sbin/mount.fuse $out/bin
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cp -v ${pkgs.unionfs-fuse}/bin/unionfs $out/bin
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substitute ${pkgs.unionfs-fuse}/sbin/mount.unionfs-fuse $out/bin/mount.unionfs-fuse \
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--replace '${pkgs.bash}/bin/bash' /bin/sh \
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--replace '${pkgs.fuse}/sbin' /bin \
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--replace '${pkgs.unionfs-fuse}/bin' /bin
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chmod +x $out/bin/mount.unionfs-fuse
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'';
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boot.initrd.postDeviceCommands = ''
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# Hacky!!! fuse hard-codes the path to mount
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mkdir -p /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.utillinux.name}/bin
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@ -17,8 +24,10 @@
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ln -s $(which umount) /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.utillinux.name}/bin
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'';
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})
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(lib.mkIf (lib.any (fs: fs == "unionfs-fuse") config.boot.supportedFilesystems) {
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system.fsPackages = [ pkgs.unionfs-fuse ];
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})
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];
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}
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@ -275,12 +275,10 @@ in
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boot.loader.grub.device = mkVMOverride "/dev/vda";
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boot.initrd.supportedFilesystems = optional cfg.writableStore "unionfs-fuse";
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boot.initrd.extraUtilsCommands =
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''
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# We need mke2fs in the initrd.
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cp ${pkgs.e2fsprogs}/sbin/mke2fs $out/bin
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cp -f ${pkgs.e2fsprogs}/sbin/mke2fs $out/bin
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'';
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boot.initrd.postDeviceCommands =
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@ -303,20 +301,6 @@ in
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chmod 1777 $targetRoot/tmp
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mkdir -p $targetRoot/boot
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${optionalString cfg.writableStore ''
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mkdir -p /unionfs-chroot/ro-store
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mount --rbind $targetRoot/nix/store /unionfs-chroot/ro-store
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mkdir /unionfs-chroot/rw-store
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${if cfg.writableStoreUseTmpfs then ''
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mount -t tmpfs -o "mode=755" none /unionfs-chroot/rw-store
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'' else ''
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mkdir $targetRoot/.nix-rw-store
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mount --bind $targetRoot/.nix-rw-store /unionfs-chroot/rw-store
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''}
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unionfs -o allow_other,cow,nonempty,chroot=/unionfs-chroot,max_files=32768,hide_meta_files /rw-store=RW:/ro-store=RO $targetRoot/nix/store
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''}
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'';
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# After booting, register the closure of the paths in
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@ -343,12 +327,13 @@ in
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# configuration, where the regular value for the `fileSystems'
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# attribute should be disregarded for the purpose of building a VM
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# test image (since those filesystems don't exist in the VM).
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fileSystems = mkVMOverride
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fileSystems = mkVMOverride (
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{ "/".device = "/dev/vda";
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"/nix/store" =
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${if cfg.writableStore then "/nix/.ro-store" else "/nix/store"} =
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{ device = "store";
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fsType = "9p";
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options = "trans=virtio,version=9p2000.L,msize=1048576,cache=loose";
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neededForBoot = true;
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};
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"/tmp/xchg" =
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{ device = "xchg";
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@ -362,6 +347,18 @@ in
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options = "trans=virtio,version=9p2000.L,msize=1048576";
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neededForBoot = true;
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};
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} // optionalAttrs cfg.writableStore
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{ "/nix/store" =
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{ fsType = "unionfs-fuse";
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device = "unionfs";
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options = "allow_other,cow,nonempty,chroot=/mnt-root,max_files=32768,hide_meta_files,dirs=/nix/.rw-store=rw:/nix/.ro-store=ro";
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};
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} // optionalAttrs (cfg.writableStore && cfg.writableStoreUseTmpfs)
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{ "/nix/.rw-store" =
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{ fsType = "tmpfs";
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options = "mode=0755";
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neededForBoot = true;
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};
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} // optionalAttrs cfg.useBootLoader
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{ "/boot" =
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{ device = "/dev/disk/by-label/boot";
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@ -369,7 +366,7 @@ in
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options = "ro";
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noCheck = true; # fsck fails on a r/o filesystem
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};
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};
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});
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swapDevices = mkVMOverride [ ];
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boot.initrd.luks.devices = mkVMOverride [];
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