Qubes/core-agent-linux
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Merge remote-tracking branch 'origin/pr/152'

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* origin/pr/152:
  Use dumpe2fs for filesystem size calculations
This commit is contained in:
Marek Marczykowski-Górecki 2019-02-11 15:03:57 +01:00
commit 9a125af36b
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1 changed files with 13 additions and 5 deletions
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18
init/resize-rootfs-if-needed.sh
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@ -14,12 +14,20 @@ fi
sysfs_xvda="/sys/class/block/xvda"
# if root filesystem is already using (almost) the whole disk
# 203M for BIOS and /boot data, 222 for ext4 filesystem overhead
# See QubesOS/qubes-core-agent-linux#146 for more details
size_margin=$(((222 + 203) * 2 * 1024))
rootfs_size=$(df --block-size=512 --output=size / | tail -n 1 | tr -d ' ')
# 203M for BIOS and /boot data
boot_data_size=$((203 * 2 * 1024))
# rootfs size is calculated on-the-fly. `df` doesn't work because it doesn't
# include fs overhead, and calculating a static size for overhead doesn't work
# because that can change dynamically over the filesystem's lifetime.
# See QubesOS/qubes-core-agent-linux#146 and QubesOS/qubes-core-agent-linux#152
# for more details
ext4_block_count=$(dumpe2fs /dev/mapper/dmroot | grep '^Block count:' | sed -E 's/Block count:[[:space:]]+//')
ext4_block_size=$(dumpe2fs /dev/mapper/dmroot | grep '^Block size:' | sed -E 's/Block size:[[:space:]]+//')
rootfs_size=$((ext4_block_count * ext4_block_size / 512))
# 5 MB in 512-byte units for some random extra bits
size_margin=$((5 * 1024 * 2))
if [ "$(cat $sysfs_xvda/size)" -lt \
$(( size_margin + rootfs_size )) ]; then
$(( rootfs_size + boot_data_size + size_margin )) ]; then
echo "root filesystem already at $rootfs_size blocks" >&2
exit 0
fi