The error occurs with a gpt formatted image, which is supported by
sfdisk.
This logic in growpart is broken for image files:
if [ -b "${DISK}p${PART}" -a "${DISK%[0-9]}" != "${DISK}" ]; then
If an image filename ends with a number, sfdisk identifies each
partition like:
${DISK}p${PART_NUMBER}
Each partition is _not_ a block device, though, so they fail the `-b
"${DISK}p${PART}"` check.
Removing that specific check fixes this issue; however, I don't know
what ramification that has for other use cases.
As a workaround, we are renaming the image file to end with a non-
numerical suffix, growing the partition, then renaming the image back to
its original name.
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https://bugs.launchpad.net/bugs/1835124
Title:
growpart mishandles image filenames that end in a number
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