diff options
-rw-r--r-- | nixos/lib/make-ext4-fs.nix | 61 |
1 files changed, 10 insertions, 51 deletions
diff --git a/nixos/lib/make-ext4-fs.nix b/nixos/lib/make-ext4-fs.nix index 694142a5123ab..47c6374c81ada 100644 --- a/nixos/lib/make-ext4-fs.nix +++ b/nixos/lib/make-ext4-fs.nix @@ -9,6 +9,7 @@ , e2fsprogs , libfaketime , perl +, lkl }: let @@ -18,16 +19,13 @@ in pkgs.stdenv.mkDerivation { name = "ext4-fs.img"; - nativeBuildInputs = [e2fsprogs.bin libfaketime perl]; + nativeBuildInputs = [e2fsprogs.bin libfaketime perl lkl]; buildCommand = '' # Add the closures of the top-level store objects. storePaths=$(cat ${sdClosureInfo}/store-paths) - # Also include a manifest of the closures in a format suitable for nix-store --load-db. - cp ${sdClosureInfo}/registration nix-path-registration - # Make a crude approximation of the size of the target image. # If the script starts failing, increase the fudge factors here. numInodes=$(find $storePaths | wc -l) @@ -38,55 +36,16 @@ pkgs.stdenv.mkDerivation { truncate -s $bytes $out faketime -f "1970-01-01 00:00:01" mkfs.ext4 -L ${volumeLabel} -U ${uuid} $out - # Populate the image contents by piping a bunch of commands to the `debugfs` tool from e2fsprogs. - # For example, to copy /nix/store/abcd...efg-coreutils-8.23/bin/sleep: - # cd /nix/store/abcd...efg-coreutils-8.23/bin - # write /nix/store/abcd...efg-coreutils-8.23/bin/sleep sleep - # sif sleep mode 040555 - # sif sleep gid 30000 - # In particular, debugfs doesn't handle absolute target paths; you have to 'cd' in the virtual - # filesystem first. Likewise the intermediate directories must already exist (using `find` - # handles that for us). And when setting the file's permissions, the inode type flags (__S_IFDIR, - # __S_IFREG) need to be set as well. - ( - echo write nix-path-registration nix-path-registration - echo mkdir nix - echo cd /nix - echo mkdir store - - # XXX: This explodes in exciting ways if anything in /nix/store has a space in it. - find $storePaths -printf '%y %f %h %m\n'| while read -r type file dir perms; do - # echo "TYPE=$type DIR=$dir FILE=$file PERMS=$perms" >&2 - - echo "cd $dir" - case $type in - d) - echo "mkdir $file" - echo sif $file mode $((040000 | 0$perms)) # magic constant is __S_IFDIR - ;; - f) - echo "write $dir/$file $file" - echo sif $file mode $((0100000 | 0$perms)) # magic constant is __S_IFREG - ;; - l) - echo "symlink $file $(readlink "$dir/$file")" - ;; - *) - echo "Unknown entry: $type $dir $file $perms" >&2 - exit 1 - ;; - esac + # Also include a manifest of the closures in a format suitable for nix-store --load-db. + cp ${sdClosureInfo}/registration nix-path-registration + cptofs -t ext4 -i $out nix-path-registration / - echo sif $file gid 30000 # chgrp to nixbld - done - ) | faketime -f "1970-01-01 00:00:01" debugfs -w $out -f /dev/stdin > errorlog 2>&1 + # Create nix/store before copying paths + faketime -f "1970-01-01 00:00:01" mkdir -p nix/store + cptofs -t ext4 -i $out nix / - # The debugfs tool doesn't terminate on error nor exit with a non-zero status. Check manually. - if egrep -q 'Could not allocate|File not found' errorlog; then - cat errorlog - echo "--- Failed to create EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks) ---" - return 1 - fi + echo "copying store paths to image..." + cptofs -t ext4 -i $out $storePaths /nix/store/ # I have ended up with corrupted images sometimes, I suspect that happens when the build machine's disk gets full during the build. if ! fsck.ext4 -n -f $out; then |