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fix: Disable COW for Virtual DSM boot image on Btrfs #1376

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Merged
kroese merged 2 commits into from
Aug 13, 2026
Merged

fix: Disable COW for Virtual DSM boot image on Btrfs #1376

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cd07750
fix: Disable COW for Virtual DSM boot image on Btrfs
kroese Aug 13, 2026
61e0aff
Update install.sh
kroese Aug 13, 2026
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31 changes: 29 additions & 2 deletions src/install.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -178,8 +178,35 @@ createSystemImage() {
return 67
fi

7z x -y -o"$tmp" "$DSM_BOOT" >/dev/null || return $?
DSM_BOOT="${DSM_BOOT%.zip}"
local bootTmp="$tmp/boot" bootBase
bootBase="$(basename "${DSM_BOOT%.zip}")"

rm -rf "$bootTmp" || return $?

if ! makeDir "$bootTmp"; then
error "Failed to create directory \"$bootTmp\" !"
return 93
fi

if [[ "${fs,,}" == "btrfs" ]]; then
{ chattr +C "$bootTmp"; } || :
fi

7z x -y -o"$bootTmp" "$DSM_BOOT" >/dev/null || return $?
DSM_BOOT="$bootTmp/$bootBase"

if [ ! -s "$DSM_BOOT" ]; then
error "The PAT boot image could not be extracted."
return 67
fi

if [[ "${fs,,}" == "btrfs" ]]; then
local attrs
attrs=$(lsattr "$DSM_BOOT") || return $?
if [[ "$attrs" != *"C"* ]]; then
error "Failed to disable COW for boot image $DSM_BOOT on ${fs^^} filesystem."
fi
fi

SYSTEM="$STORAGE/$BASE.system.img"
rm -f "$SYSTEM" || return $?
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