[Bug 1728310] [NEW] libnfsidmap2 fails to obtain username which results in failed translation

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You have been subscribed to a public bug by Brian Murray (brian-murray):

Environment: IPA + NFSv4 (sec=krb5).

nss.c uses wrong '@' sign to detect the NFS domain resulting in "nobody"
ownerships and the following error messages in an IPA environment:

Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: key: 0x2c254c26 type: uid value: rns at localdomain@ipa.localdomain timeout 600
Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nfs4_name_to_uid: calling nsswitch->name_to_uid
Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nss_getpwnam: name 'rns at localdomain@ipa.localdomain' domain 'ipa.localdomain': resulting localname '(null)'
Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nss_getpwnam: name 'rns at localdomain@ipa.localdomain' does not map into domain 'ipa.localdomain'
Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nfs4_name_to_uid: nsswitch->name_to_uid returned -22
Oct 25 16:49:42 ubuntu-16.04-client.sub.localdomain nfsidmap[6163]: nfs4_name_to_uid: final return value is -22

Affects at least libnfsidmap2=0.25-5 and 0.25-5.1 on 16.04, 16.10,
17.04, 17.10

Corresponding Debian bug report: https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=744768

Tested patch attached.

** Affects: autofs (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: autofs (Debian)
     Importance: Unknown
         Status: New


** Tags: patch xenial
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libnfsidmap2 fails to obtain username which results in failed translation
https://bugs.launchpad.net/bugs/1728310
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