On 07/03/18 10:46, Zbigniew Jędrzejewski-Szmek wrote:
On Wed, Mar 07, 2018 at 10:28:58AM +0000, Tom Hughes wrote:
On 07/03/18 10:10, Florian Weimer wrote:
On 03/06/2018 03:24 PM, Zbigniew Jędrzejewski-Szmek wrote:
It's a very simple tool to create system users and group in /etc/passwd.
It just creates entries in/etc/{passwd,group,shadow}, and does not
interact with audit in any way afaik.
Does it perform any locking or cache invalidation?
It appears to do locking:
https://github.com/systemd/systemd/blob/master/src/sysusers/sysusers.c#L1953
which is calling:
https://github.com/systemd/systemd/blob/master/src/basic/user-util.c#L548
which takes a write lock on /etc/.pwd.lock around everything.
Ack.
Cache invalidation? I'm not sure what you mean, it just replaces the
file atomically and syncs the file system.
Well historically nscd I guess though I think sssd is supposed to
have replaced that now?
I believe sssd watches the files with inotify and does it's own
cache invalidation - a quick test with strace suggests it notices
when I edit the groups file with vi.
Tom
--
Tom Hughes (tom@xxxxxxxxxx)
http://compton.nu/
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