On Mon, 26 Jul 2021 23:19:09 +0300, Nicholas Guriev wrote:
>However in general, /tmp is not intended to have important data which
>is worth regretting.
Let alone that tmp could be mounted as tmpfs, see
https://en.wikipedia.org/wiki/Tmpfs . However, even if it's not a
tmpfs, a systemd unit might clean /tmp, for Ubuntu see
https://askubuntu.com/questions/20783/how-is-the-tmp-directory-cleaned-up
.
Disabling or masking related systemd units should work.
An example from my Arch Linux install. It's not mounted by fstab, but
by a systemd unit.
[rocketmouse@archlinux ~]$ df -h | grep tmpfs
tmpfs 3.9G 31M 3.9G 1% /dev/shm
tmpfs 3.9G 1.9M 3.9G 1% /tmp
tmpfs 786M 104K 785M 1% /run/user/1000
[rocketmouse@archlinux ~]$ cat /etc/fstab | grep tmp
#tmpfs /tmptmpfs nodev,nosuid,size=3G 0 0
[rocketmouse@archlinux ~]$ systemctl status tmp.mount
● tmp.mount - Temporary Directory /tmp
Loaded: loaded (/proc/self/mountinfo; static)
Active: active (mounted) since Sat 2021-07-03 21:09:58 CEST; 3 weeks 2
days ago
Where: /tmp
What: tmpfs
Docs: https://systemd.io/TEMPORARY_DIRECTORIES
man:file-hierarchy(7)
https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
Tasks: 0 (limit: 9398)
Memory: 32.0K
CPU: 1ms
CGroup: /system.slice/tmp.mount
Jul 03 21:09:58 archlinux systemd[1]: Mounting Temporary Directory (/tmp)...
Jul 03 21:09:58 archlinux systemd[1]: Mounted Temporary Directory (/tmp).
[rocketmouse@archlinux ~]$ systemctl status systemd-tmpfiles-clean
○ systemd-tmpfiles-clean.service - Cleanup of Temporary Directories
Loaded: loaded (/usr/lib/systemd/system/systemd-tmpfiles-clean.service;
static)
Active: inactive (dead) since Mon 2021-07-26 21:35:55 CEST; 1h 47min ago
TriggeredBy: ● systemd-tmpfiles-clean.timer
Docs: man:tmpfiles.d(5)
man:systemd-tmpfiles(8)
Process: 1018193 ExecStart=systemd-tmpfiles --clean (code=exited,
status=0/SUCCESS)
Main PID: 1018193 (code=exited, status=0/SUCCESS)
CPU: 65ms
Jul 26 21:35:55 archlinux systemd[1]: Starting Cleanup of Temporary
Directories...
Jul 26 21:35:55 archlinux systemd[1]: systemd-tmpfiles-clean.service:
Deactivated successfully.
Jul 26 21:35:55 archlinux systemd[1]: Finished Cleanup of Temporary Directories.
[rocketmouse@archlinux ~]$ systemctl status systemd-tmpfiles-clean.timer
● systemd-tmpfiles-clean.timer - Daily Cleanup of Temporary Directories
Loaded: loaded (/usr/lib/systemd/system/systemd-tmpfiles-clean.timer;
static)
Active: active (waiting) since Sat 2021-07-03 21:09:58 CEST; 3 weeks 2
days ago
Trigger: Tue 2021-07-27 21:35:55 CEST; 22h left
Triggers: ● systemd-tmpfiles-clean.service
Docs: man:tmpfiles.d(5)
man:systemd-tmpfiles(8)
Jul 03 21:09:58 archlinux systemd[1]: Started Daily Cleanup of Temporary
Directories.
[rocketmouse@archlinux ~]$ man systemctl | grep " mask UNIT" -A4
mask UNIT...
Mask one or more units, as specified on the command line. This will
link these unit files to /dev/null, making it impossible to start them. This is
a stronger version of
disable, since it prohibits all kinds of activation of the unit,
including enablement and manual activation. Use this option with care. This
honors the --runtime option to
only mask temporarily until the next reboot of the system. The --now
option may be used to ensure that the units are also stopped. This command
expects valid unit names only,
it does not accept unit file paths
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