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** Changed in: linux (Ubuntu)
Status: In Progress => Won't Fix
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https://bugs.launchpad.net/bugs/1039402
Title:
[quantal] overlayfs over r/o NFS mount fails to overwrite existing
files
Status in linux package in Ubuntu:
Won't Fix
Bug description:
This is a followup to bug #1038075
Testcase: (Kernel taken from
http://people.canonical.com/~apw/lp1038075-quantal/)
$ uname -a
Linux faui49i 3.5.0-11-generic #11lp1038075v201208181342 SMP Sat Aug 18
12:56:20 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
$ modprobe overlayfs
$ mkdir /live/tmpfs /tmp/root
$ mount -t nfs -o ro 192.168.42.40:/srv/fai/nfsroot.quantal64 /mnt
$ stat /mnt/etc/resolv.conf
File: `/mnt/etc/resolv.conf'
Size: 206 Blocks: 8 IO Block: 1048576 regular file
Device: 1ch/28d Inode: 36044830 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-08-20 10:53:27.177775447 +0200
Modify: 2012-08-08 12:50:21.000000000 +0200
Change: 2012-08-16 04:06:12.317826670 +0200
Birth: -
$ mount -t overlayfs -o noatime,lowerdir=/mnt,upperdir=/live/overlayfs
overlayfs /live/root
$ stat /live/root/etc/resolv.conf
File: `/live/root/etc/resolv.conf'
Size: 206 Blocks: 8 IO Block: 1048576 regular file
Device: 1ch/28d Inode: 36044830 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-08-20 10:53:27.177775447 +0200
Modify: 2012-08-08 12:50:21.000000000 +0200
Change: 2012-08-16 04:06:12.317826670 +0200
Birth: -
$ echo foo > /live/root/etc/resolv.conf
bash: /live/root/etc/resolv.conf: Permission denied
This permission error does not happen with a local filesystem but only
with NFS.
However this seems to work:
$ rm /live/root/etc/resolv.conf
$ echo foo > /live/root/etc/resolv.conf
$ cat /live/root/etc/resolv.conf
foo
---
ApportVersion: 2.4-0ubuntu8
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path',
'/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/hwC0D3',
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D3p',
'/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D7p', '/dev/snd/seq', '/dev/snd/timer']
failed with exit code 1:
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
CurrentDmesg:
Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg
-'] failed with exit code 1: comm: /var/log/dmesg: Permission denied
dmesg: write failed: Broken pipe
DistroRelease: Ubuntu 12.10
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MachineType: FUJITSU ESPRIMO P7935
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: root=UUID=871b8166-1de3-42f9-845b-d3353e32beec ro quiet
splash
ProcVersionSignature: Ubuntu 3.5.0-11.11lp1038075v201208181342-generic 3.5.2
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RfKill:
Tags: quantal
Uname: Linux 3.5.0-11-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: netgrp netgrp sbuild
WifiSyslog:
dmi.bios.date: 01/12/2010
dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
dmi.bios.version: 6.00 R1.20.2812.A2
dmi.board.name: D2812-A2
dmi.board.vendor: FUJITSU
dmi.board.version: S26361-D2812-A2
dmi.chassis.type: 6
dmi.chassis.vendor: FUJITSU
dmi.modalias:
dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvr6.00R1.20.2812.A2:bd01/12/2010:svnFUJITSU:pnESPRIMOP7935:pvr:rvnFUJITSU:rnD2812-A2:rvrS26361-D2812-A2:cvnFUJITSU:ct6:cvr:
dmi.product.name: ESPRIMO P7935
dmi.sys.vendor: FUJITSU
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