Bug 1173119

Tracking it in trello. Thanks!

(In reply to Ludwig Nussel from comment #0)
> [...] That means for yast it needs to
> read the default from /usr/etc/nsswitch.conf and changed lines to
> /etc/nsswitch.conf. It must not duplicate the complete file though.

If I didn't miss something, this is not working as described. Once you have the /etc/nsswitch.conf file in the system, /usr/etc/nsswitch.conf is completely ignored.

To check it, I installed the latest openSUSE TW available, 


> localhost:~ # cat /etc/os-release 
> 
> NAME="openSUSE Tumbleweed"
> \# VERSION="20200715"
> ID="opensuse-tumbleweed"
> ID_LIKE="opensuse suse"
> VERSION_ID="20200715"
> PRETTY_NAME="openSUSE Tumbleweed"
> ANSI_COLOR="0;32"
> CPE_NAME="cpe:/o:opensuse:tumbleweed:20200715"
> BUG_REPORT_URL="https://bugs.opensuse.org"
> HOME_URL="https://www.opensuse.org/"
> LOGO="distributor-logo"


which comes with both files


> localhost:~ # find / -name "nsswitch.conf"
> 
> /usr/etc/nsswitch.conf
> /etc/nsswitch.conf


And, using the `strace` command, I could check that only /etc/nsswitch.conf file is being read


> localhost:~ # strace getent hosts 2>&1 | grep nsswitch.conf
> 
> openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3
> read(3, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 2221


Then, I "removed" it temporary, which results in /usr/etc/nsswitch.conf been reading after failing to load /etc/nsswitch.conf


> localhost:~ # strace getent hosts 2>&1 | grep nsswitch.conf
> 
> openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
> openat(AT_FDCWD, "/usr/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3
> read(3, "#\n# /etc/nsswitch.conf\n#\n# An ex"..., 4096) = 2190


Going a little bit further, I created a very basic /etc/nsswitch.conf file just to "overwrite" the configuration of /usr/etc/nsswitch.conf for `passwd` from "compat" to "files". But, contrary as expected, the /usr/etc/nsswitch.conf file is not used for reading the rest of configuration


> localhost:~ # echo "passwd:  files" > /etc/nsswitch.conf
> localhost:~ # strace getent hosts 2>&1 | grep nsswitch.conf
> 
> openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3


Even more, to probe if "only changed lines should be added to /etc/nsswitch.conf", I modified the "hosts" entry in /usr/etc/nsswitch.conf from "files nis" to "db" without success


> localhost:~ # getent hosts
> 127.0.0.1       localhost


However, setting it in /etc/nsswitch.conf works


> 
> localhost:~ # echo "hosts:   db" > /etc/nsswitch.conf
> localhost:~ # getent hosts
> 
> localhost:~ # 
> 


With those tests in mind, do you think there is another problem here? Or maybe still being necessary to duplicate the file when wanting to overwrite some entries?

Thanks.

In fact, seems that this configuration file corresponds to the "Variant 3" described in "Packaging UsrEtc"[1] openSUSE wiki page. Then, we will resume the work considering that "/etc/nsswitch.conf" is a replacement of "/usr/etc/nsswitch.conf"


[1] https://en.opensuse.org/openSUSE:Packaging_UsrEtc#Variant_3

I'll have to revisit the glibc patch. Having to duplicate the entire file was not intended.

In principle this bug was fixed via
https://build.opensuse.org/request/show/823151

(In reply to Ludwig Nussel from comment #4)
> I'll have to revisit the glibc patch. Having to duplicate the entire file
> was not intended.

The previous submit request assumes that's the case. If you confirm duplicating the whole file is not needed, please reopen this bug.