Your message dated Sat, 10 Aug 2024 23:15:05 +0200
with message-id <[email protected]>
and subject line Re: Bug#704664: bash: erases history when disk is full
has caused the Debian Bug report #704664,
regarding bash: erases history when disk is full
to be marked as done.
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--
704664: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=704664
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: bash
Version: 4.2+dfsg-0.1
Severity: grave
Justification: causes non-serious data loss
Dear Maintainer,
I ran out of disk space last night. Today I'm greeted with an (almost) empty
bash history. The only commands left in ~/.bash_history start with the command
that caused the full-disk situation.
The only explanation I can think of as being the cause of this behaviour is
that bash is trying to overwrite ~/.bash_history rather than writing to a
temporary file and renaming it appropriately (as would have been good practice
I believe). Naively trying to overwrite will lose data in a wide variety of
situations including but not limited to loss of power, over-quota and full-disk
situations.
Severity set to grave as this causes data loss and, in my case, losing a year
of history is clearly not fun (TM).
Cheers,
Rene
-- System Information:
Debian Release: 7.0
APT prefers testing
APT policy: (650, 'testing'), (600, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 3.2.0-4-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
Versions of packages bash depends on:
ii base-files 7.1
ii dash 0.5.7-3
ii debianutils 4.3.2
ii libc6 2.13-38
ii libtinfo5 5.9-10
Versions of packages bash recommends:
ii bash-completion 1:2.0-1
Versions of packages bash suggests:
pn bash-doc <none>
-- no debconf information
--- End Message ---
--- Begin Message ---
Version: 5.2.21-2.1
On Thu, 04 Apr 2013 10:50:37 +0200 Rene Wagner <[email protected]> wrote:
I ran out of disk space last night. Today I'm greeted with an (almost) empty
bash history. The only commands left in ~/.bash_history start with the command
that caused the full-disk situation.
The only explanation I can think of as being the cause of this behaviour is
that bash is trying to overwrite ~/.bash_history rather than writing to a
temporary file and renaming it appropriately (as would have been good practice
I believe). Naively trying to overwrite will lose data in a wide variety of
situations including but not limited to loss of power, over-quota and full-disk
situations.
Bash version 5.2.21 overwrites the history file in a more careful way,
so that its content is not lost when the history files is being written
with a full disk.
This can be tested in the following way:
1. Copy a lot of lines into the clipboard:
$ cat /usr/share/dict/words | grep -E '^[a-z]+$' |
head -n 10000 | xclip -selection clipboard
2. Set up a Debian VM with very little free space:
$ debvm-create -- --customize-hook='echo tmpfs /root tmpfs
defaults,mode=0755,size=10k >> "$1/etc/fstab"'
3. Log into the VM, fill up the space, update .bash_history:
$ debvm-run
# echo hello
# history -a
# cat .bash_history
echo hello
history -a
# cat /dev/random > foo
(paste lines into terminal and press enter)
# history -a
4. Check that .bash_history is still there and not empty:
# head .bash_history -n 20
echo hello
history -a
cat .bash_history
cat /dev/random > foo
history -a
a
aardvark
aardvarks
abaci
aback
abacus
[...]
The file is truncated (most of the words have not been saved), but it is
still there and contains at least the older history entries.
--
Gioele Barabucci
--- End Message ---
