Public bug reported:
I'm posting this against util-linux because it's lsblk calls that fail,
but the failure depends on a prior call to sfdisk which is part of the
fdisk package. Remove the sfdisk call, and the failure does not happen,
at least in my test setup.
A call to sfdisk in a script causes a failure of a later series of calls
to lsblk, in which lsblk fails to return information.
I know sfdisk is designed for humans, but I'm wanting to automate the
operation of its --backup option, and don't know of another way. In any
event, this failure shoudl be addressed.
I'm attaching a script with illustrates both the problem and a
workaround. The workaround is to introduce a "sleep 1" call in between
the calls to lsblk. I can't even imagine why this works, but it does in
my configuration. I call the script with the name of a device which
contains two ntfs partitions, and the name of a directory where results
are to be stored. The directory must contain a "clone.log" file (it can
be empty; it's just to make sure I'm naming the correct directory).
If I call it so it fails:
bash b5.sh sda /tmp
because the final lsblk call does not return any information
However, if I call is to, it succeeds:
bash -s b5.sh sda /tmp
because the "-s" switch introduces a "sleep 1" call between lsblk calls.
This makes no sense, which is why I consider it a bug.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: util-linux 2.31.1-0.4ubuntu3.6
ProcVersionSignature: Ubuntu 4.15.0-101.102-generic 4.15.18
Uname: Linux 4.15.0-101-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
Date: Sun Jun 14 09:36:17 2020
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: util-linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
** Attachment added: "shell script which illustrates the bug and a workaround"
https://bugs.launchpad.net/bugs/1883441/+attachment/5383785/+files/b5.sh
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https://bugs.launchpad.net/bugs/1883441
Title:
Fatal interaction between sfdisk and lsblk
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