[systemd-devel] systemd on RHEL 8/CentOS 8 adding leading / to mount What= values

[Colin Guthrie]

Hi all,

I've been running happily on CentOS 8.3 for a while but did an update 
recently to 8.4 and systemd-239-45.el8_4.1.x86_64 (old version but with 
a ton of backports as I'm sure you know/can imagine)

Since then my mount units for VirtualBox Shared Folders stopped working.

I traced this down to the fact that when "mount" is eventually called, 
the What= value specified in the mount unit has been mangled to add a 
preceding /

e.g. my mount unit is:

[Unit]

Before=local-fs.target



[Mount]

Where=/SharedFolderName
What=SharedFolderName
Type=vboxsf



[Install]

WantedBy=local-fs.target




The mount command that is eventually called is:

   mount /SharedFolderName /SharedFolderName -o rw

whereas it *should* be:

   mount SharedFolderName /SharedFolderName -o rw


Does anyone recall if this is a known bug that has occurred at some 
point and the RHEL systemd maintainers need to also backport it's fix? 
Or is it perhaps a bug in libmount? If anyone has any recollection that 
would be ace.

Also if it is a systemd bug and a backport is needed, can I make a 
friendly request to any RHEL systemd maintainers reading this to also 
include the fix for https://github.com/systemd/systemd/issues/10526 so I 
can use squashfs container images in my dev setup. Would be much 
appreciated :-)

Cheers

Col