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image: adjust file size and partition calculations

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When creating images on a build host with a compressed filesystem (e.g. ZFS + compression),
du would report smaller file sizes causing the root partition to be undersized and failing.

Use --apparent-size to get the actual file sizes and increase the amount added to 384MiB to
account for filesystem metadata.
This commit is contained in:
Jools Wills
2026-08-21 01:15:56 +01:00
parent baad43d0fa
commit 5bf9b95208
1 changed files with 5 additions and 4 deletions
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scriptmodules/admin/image.sh
+5 -4
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@@ -311,10 +311,11 @@ function create_image() {
# if not specified default the boot size partition to 512MiB
[[ -z "$boot_size_mib" ]] && boot_size_mib=512
# get size of files in MiB
local chroot_size_mib=$(du -s -m "$chroot" 2>/dev/null | cut -f1)
# make image size 256MiB larger than contents of chroot and boot partition
local image_size_mib=$((boot_size_mib + chroot_size_mib + 256))
# Get file size in MiB: use --apparent-size to avoid underestimating
# file sizes on a compressed filesystem (e.g. ZFS + compression)
local chroot_size_mib=$(du -s -m --apparent-size "$chroot" 2>/dev/null | cut -f1)
# make image size 384MiB larger than contents of chroot and boot partition
local image_size_mib=$((boot_size_mib + chroot_size_mib + 384))
# create image
printMsgs "console" "Creating image $image ..."