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Merge pull request #79368 from sorki/ext4resize

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nixos/lib/make-ext4-fs: fall back to resize2fs -M if exact resize fails
This commit is contained in:
Samuel Dionne-Riel 2020-02-09 14:35:08 -05:00 committed by GitHub
commit cebb0b49d4
1 changed files with 3 additions and 16 deletions
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19
nixos/lib/make-ext4-fs.nix
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@ -64,7 +64,7 @@ pkgs.stdenv.mkDerivation {
echo "copying files to image..."
cptofs -t ext4 -i $img ./files/* /
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.
if ! fsck.ext4 -n -f $img; then
echo "--- Fsck failed for EXT4 image of $bytes bytes (numInodes=$numInodes, numDataBlocks=$numDataBlocks) ---"
@ -72,21 +72,8 @@ pkgs.stdenv.mkDerivation {
return 1
fi
(
# Resizes **snugly** to its actual limits (or closer to)
free=$(dumpe2fs $img | grep '^Free blocks:')
blocksize=$(dumpe2fs $img | grep '^Block size:')
blocks=$(dumpe2fs $img | grep '^Block count:')
blocks=$((''${blocks##*:})) # format the number.
blocksize=$((''${blocksize##*:})) # format the number.
# System can't boot with 0 blocks free.
# Add 16MiB of free space
fudge=$(( 16 * 1024 * 1024 / blocksize ))
size=$(( blocks - ''${free##*:} + fudge ))
echo "Resizing from $blocks blocks to $size blocks. (~ $((size*blocksize/1024/1024))MiB)"
EXT2FS_NO_MTAB_OK=yes resize2fs $img -f $size
)
echo "Resizing to minimum allowed size"
resize2fs -M $img
# And a final fsck, because of the previous truncating.
fsck.ext4 -n -f $img