Mac OS X Catalina - NFS File Access Behavior in CRON or Launchd Post: 303045424

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Top Forums UNIX for Beginners Questions & Answers Mac OS X Catalina - NFS File Access Behavior in CRON or Launchd Post 303045424 by bminear on Friday 20th of March 2020 10:40:09 AM

03-20-2020

Registered User

Mac OS X Catalina - NFS File Access Behavior in CRON or Launchd

I'm really struggling here, and I think this is a new effect of upgrade to Catalina. I have an automounted NFS directory that contains a file I want to periodically copy to my Mac's local file system. I have a script that does this, and it worked beautifully before Catalina upgrade. If I run the script manually (as root) it's all good. If I run the script as part of a scheduled job it fails. I've tried launching the script in root owned cron job, and I've tried using Launchd. Both fail the same way.

My script:

#!/bin/sh

if [ -f /System/Volumes/Data/nfs/hosts ]
then
cat /etc/hosts.base /System/Volumes/Data/nfs/hosts > /etc/hosts
fi

/System/Volumes/Data/nfs is an NFS share coming off a Synology NAS.

The [ -f ...] part works fine. It can successfully determine if the hosts file exists in the NFS directory. But the cat command fails reading the hosts file. Again, if I run the script manually it all works fine. It only fails if the script is launched from cron or launchd.

File permissions:

brians-mbp:etc root# ls -la /System/Volumes/Data/nfs/hosts
-rwxrwxrwx 1 1024 _lpoperator 2393 Feb 8 14:29 /System/Volumes/Data/nfs/hosts

I've tried fiddling with owner and group, no effect. I've tried different approaches of mounting the NFS drive (automount, fstab, etc), no effect. I've tried different directories, different filenames, etc, no effect. I've tried using different shells in the script (sh, zsh, ...), no effect.

I've tried to find whether Catalina introduced some new ACL mechanisms but can't find anything other than gripes about how Apple changed directory structure in Catalina. But the fact that the script runs just fine if run manually tells me the permissions/ACLs must be ok.

Any ideas?

Brian

bminear

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tapset::nfs

tapset::nfs(3stap)														tapset::nfs(3stap)

NAME

       tapset::nfs - systemtap nfs tapset

DESCRIPTION

       nfs.fop.llseek
	      NFS client llseek operation

	       See probe::nfs.fop.llseek(3stap)
	       for details.

       nfs.fop.read
	      NFS client read operation

	       See probe::nfs.fop.read(3stap)
	       for details.

       nfs.fop.write
	      NFS client write operation

	       See probe::nfs.fop.write(3stap)
	       for details.

       nfs.fop.aio_read
	      NFS client aio_read file operation

	       See probe::nfs.fop.aio_read(3stap)
	       for details.

       nfs.fop.aio_write
	      NFS client aio_write file operation

	       See probe::nfs.fop.aio_write(3stap)
	       for details.

       nfs.fop.mmap
	      NFS client mmap operation

	       See probe::nfs.fop.mmap(3stap)
	       for details.

       nfs.fop.open
	      NFS client file open operation

	       See probe::nfs.fop.open(3stap)
	       for details.

       nfs.fop.flush
	      NFS client flush file operation

	       See probe::nfs.fop.flush(3stap)
	       for details.

       nfs.fop.release
	      NFS client release page operation

	       See probe::nfs.fop.release(3stap)
	       for details.

       nfs.fop.fsync
	      NFS client fsync operation

	       See probe::nfs.fop.fsync(3stap)
	       for details.

       nfs.fop.lock
	      NFS client file lock operation

	       See probe::nfs.fop.lock(3stap)
	       for details.

       nfs.fop.sendfile
	      NFS client send file operation

	       See probe::nfs.fop.sendfile(3stap)
	       for details.

       nfs.fop.check_flags
	      NFS client checking flag operation

	       See probe::nfs.fop.check_flags(3stap)
	       for details.

       nfs.aop.readpage
	      NFS client synchronously reading a page

	       See probe::nfs.aop.readpage(3stap)
	       for details.

       nfs.aop.readpages
	      NFS client reading multiple pages

	       See probe::nfs.aop.readpages(3stap)
	       for details.

       nfs.aop.set_page_dirty
	      NFS client marking page as dirty

	       See probe::nfs.aop.set_page_dirty(3stap)
	       for details.

       nfs.aop.writepage
	      NFS client writing a mapped page to the NFS server

	       See probe::nfs.aop.writepage(3stap)
	       for details.

       nfs.aop.writepages
	      NFS client writing several dirty pages to the NFS server

	       See probe::nfs.aop.writepages(3stap)
	       for details.

       nfs.aop.write_begin
	      NFS client begin to write data

	       See probe::nfs.aop.write_begin(3stap)
	       for details.

       nfs.aop.write_end
	      NFS client complete writing data

	       See probe::nfs.aop.write_end(3stap)
	       for details.

       nfs.aop.release_page
	      NFS client releasing page

	       See probe::nfs.aop.release_page(3stap)
	       for details.

SEE ALSO

	  probe::nfs.fop.llseek(3stap),      probe::nfs.fop.read(3stap),      probe::nfs.fop.write(3stap),	probe::nfs.fop.aio_read(3stap),
       probe::nfs.fop.aio_write(3stap),      probe::nfs.fop.mmap(3stap),       probe::nfs.fop.open(3stap),	  probe::nfs.fop.flush(3stap),
       probe::nfs.fop.release(3stap),	     probe::nfs.fop.fsync(3stap),      probe::nfs.fop.lock(3stap),	probe::nfs.fop.sendfile(3stap),
       probe::nfs.fop.check_flags(3stap),		 probe::nfs.aop.readpage(3stap),		 probe::nfs.aop.readpages(3stap),
       probe::nfs.aop.set_page_dirty(3stap),		    probe::nfs.aop.writepage(3stap),		  probe::nfs.aop.writepages(3stap),
       probe::nfs.aop.write_begin(3stap),  probe::nfs.aop.write_end(3stap),  probe::nfs.aop.release_page(3stap),  stap(1), stapprobes(3stap)

IBM
									---							tapset::nfs(3stap)