Your message dated Fri, 15 Jul 2016 16:17:21 -0400
with message-id <[email protected]>
and subject line Re: Bug#831423: e2fsprogs: tune2fs -l modifies file system
has caused the Debian Bug report #831423,
regarding e2fsprogs: tune2fs -l modifies file system
to be marked as done.
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--
831423: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=831423
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: e2fsprogs
Version: 1.43.1-1
Severity: normal
The 'tune2fs -l' command modifies the file system. The man page says:
-l List the contents of the filesystem superblock, including the
current values of the parameters that can be set via this program.
To recreate the problem:
# stat --format=%y /
2016-07-15 07:23:18.767919229 -0600
# tune2fs -l /dev/mapper/v1-root > /dev/null
# stat --format=%y /
2016-07-15 13:56:20.703068156 -0600
Interestingly:
# chattr +i /
# lsattr -d /
----i-------------- /
# stat --format=%y /
2016-07-15 13:56:20.703068156 -0600
# tune2fs -l /dev/mapper/v1-root > /dev/null
# stat --format=%y /
2016-07-15 13:56:20.703068156 -0600
But no errors were produced. So even though it is modifying the file
system it isn't checking error codes.
Thank you for maintaining these utilities in Debian.
Bob
-- System Information:
Debian Release: stretch/sid
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 4.6.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages e2fsprogs depends on:
ii e2fslibs 1.43.1-1
ii libblkid1 2.28-5
ii libc6 2.23-1
ii libcomerr2 1.43.1-1
ii libss2 1.43.1-1
ii libuuid1 2.28-5
ii util-linux 2.28-5
e2fsprogs recommends no packages.
Versions of packages e2fsprogs suggests:
pn e2fsck-static <none>
pn fuse2fs <none>
ii gpart 1:0.3-3
ii parted 3.2-15
-- no debconf information
--- End Message ---
--- Begin Message ---
tags 831423 +unreproducible
thanks
On Fri, Jul 15, 2016 at 02:00:42PM -0600, Bob Proulx wrote:
> Package: e2fsprogs
> Version: 1.43.1-1
> Severity: normal
>
> The 'tune2fs -l' command modifies the file system.
Your test is invalid. stat --format=%y / checks the modtime of the
root directory. Let's try this on an umounted file system, shall we?
# mke2fs -Fq -t ext4 /tmp/foo.img 100k
Filesystem too small for a journal
# md5sum /tmp/foo.img
935ede824a1e5281dda45acdd9ce87ee /tmp/foo.img
# stat /tmp/foo.img
File: '/tmp/foo.img'
Size: 102400 Blocks: 56 IO Block: 4096 regular file
Device: 21h/33d Inode: 7779798 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Context: unconfined_u:object_r:user_tmp_t:s0
Access: 2016-07-15 16:11:16.964096619 -0400
Modify: 2016-07-15 16:11:06.044206092 -0400
Change: 2016-07-15 16:11:06.044206092 -0400
Birth: -
# tune2fs -l /tmp/foo.img > /dev/null
# md5sum /tmp/foo.img
935ede824a1e5281dda45acdd9ce87ee /tmp/foo.img
# stat /tmp/foo.img
File: '/tmp/foo.img'
Size: 102400 Blocks: 56 IO Block: 4096 regular file
Device: 21h/33d Inode: 7779798 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Context: unconfined_u:object_r:user_tmp_t:s0
Access: 2016-07-15 16:11:31.563950277 -0400
Modify: 2016-07-15 16:11:06.044206092 -0400
Change: 2016-07-15 16:11:06.044206092 -0400
Birth: -
You can see here that the /tmp/foo.img file isn't being modified at
all.
The root file system is mounted, and any number of things other than
tune2fs could be modifying the file system --- some other program, the
shell running the tune2fs program, etc.
- Ted
P.S If you use strace you will see that the file system is opened
O_RDONLY. So it's not *possible* for tune2fs -l to modify the file
system whose file system state is being displayed:
open("/tmp/foo.img", O_RDONLY) = 3
--- End Message ---
