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nixos/lib/make-ext4-fs: use mkfs.ext4 instead of cptofs

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This fixes image creation on armv7l when image is bigger than 2G.
Also fix some reproducibility issues and other cptofs issues.
This commit is contained in:
misuzu 2020-03-16 11:58:05 +02:00
parent 21a21a4224
commit 9ac1ab10c9
1 changed files with 19 additions and 20 deletions
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39
nixos/lib/make-ext4-fs.nix
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@ -17,7 +17,7 @@
, e2fsprogs
, libfaketime
, perl
, lkl
, fakeroot
}:
let
@ -26,7 +26,7 @@ in
pkgs.stdenv.mkDerivation {
name = "ext4-fs.img${lib.optionalString compressImage ".zst"}";
nativeBuildInputs = [ e2fsprogs.bin libfaketime perl lkl ]
nativeBuildInputs = [ e2fsprogs.bin libfaketime perl fakeroot ]
++ lib.optional compressImage zstd;
buildCommand =
@ -37,32 +37,31 @@ pkgs.stdenv.mkDerivation {
${populateImageCommands}
)
# Add the closures of the top-level store objects.
storePaths=$(cat ${sdClosureInfo}/store-paths)
echo "Preparing store paths for image..."
# Create nix/store before copying path
mkdir -p ./rootImage/nix/store
xargs -I % cp -a --reflink=auto % -t ./rootImage/nix/store/ < ${sdClosureInfo}/store-paths
(
GLOBIGNORE=".:.."
shopt -u dotglob
cp -a --reflink=auto ./files/* -t ./rootImage/
)
# Also include a manifest of the closures in a format suitable for nix-store --load-db
cp ${sdClosureInfo}/registration ./rootImage/nix-path-registration
# Make a crude approximation of the size of the target image.
# If the script starts failing, increase the fudge factors here.
numInodes=$(find $storePaths ./files | wc -l)
numDataBlocks=$(du -s -c -B 4096 --apparent-size $storePaths ./files | tail -1 | awk '{ print int($1 * 1.10) }')
numInodes=$(find ./rootImage | wc -l)
numDataBlocks=$(du -s -c -B 4096 --apparent-size ./rootImage | tail -1 | awk '{ print int($1 * 1.10) }')
bytes=$((2 * 4096 * $numInodes + 4096 * $numDataBlocks))
echo "Creating an EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks)"
truncate -s $bytes $img
faketime -f "1970-01-01 00:00:01" mkfs.ext4 -L ${volumeLabel} -U ${uuid} $img
# 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 $img nix-path-registration /
# Create nix/store before copying paths
faketime -f "1970-01-01 00:00:01" mkdir -p nix/store
cptofs -t ext4 -i $img nix /
echo "copying store paths to image..."
cptofs -t ext4 -i $img $storePaths /nix/store/
echo "copying files to image..."
cptofs -t ext4 -i $img ./files/* /
faketime -f "1970-01-01 00:00:01" fakeroot mkfs.ext4 -L ${volumeLabel} -U ${uuid} -d ./rootImage $img
export EXT2FS_NO_MTAB_OK=yes
# I have ended up with corrupted images sometimes, I suspect that happens when the build machine's disk gets full during the build.