Exclude an automount (mount it locally) from LDAP automountMap

[Žarko D]

Hi,

This is similar as the port from May 2023 (Mixing both local files and LDAP for automount maps).
This use case is to continue using LDAP automountMap, except one (or more) automounts that we want to mount as local directories.

This has been accomplished with RHEL 7, hopefully same can be done with sssd on RHEL 8 and later.

Brief RHEL 7 configuration
-----------------------------

+ The /etc/auto.master reads
/proj /etc/auto.proj

+ The /etc/auto.proj reads
zzz host:/export/zzz
+auto.proj

+ nsswitch.conf reads
automount:  files ldap

+ Automount dump reads:

Mount point: /proj
source(s):
  instance type(s): file
  map: /etc/auto.proj
  zzz | host-1:/export/zzz
  zzz | storage:/pool/zzz

+ Result
1. /proj/zzz is mounted ONLY on the host-1 as /export/zzz
2. Other /proj/folders are all mounted as expected
3. Other hosts (w/o custom auto.master, auto.proj) mount as /proj/zzz

RHEL 9
--------
+ sssd.conf reads

[domain/default]
id_provider = ldap
autofs_provider = ldap
auth_provider = ldap
chpass_provider = ldap
ldap_uri = ldaps://server
ldap_search_base = dc=ex,dc=com
ldap_group_search_base =  dc=ex,dc=com
ldap_netgroup_search_base =  dc=ex,dc=com
ldap_id_use_start_tls = True
ldap_tls_cacertdir = /etc/openldap/cacerts/
cache_credentials = True
ldap_tls_reqcert = allow
ldap_autofs_search_base =  o=x,dc=ex,dc=com
ldap_autofs_map_object_class = automountMap
ldap_autofs_map_name = automountMapName
ldap_autofs_entry_object_class = automount
ldap_autofs_entry_key = automountKey
ldap_autofs_entry_value = automountInformation

+ nsswitch.conf
automount:  files sss

# same as RHEL 7
+ The /etc/auto.master reads
/project /etc/auto.proj

+ The /etc/auto.proj reads
zzz host-1:/export/zzz
+auto.proj

+ Automount dump is also same as with RHEL 7.
Mount point: /proj
source(s):
  instance type(s): file
  map: /etc/auto.proj
  zzz | host-1:/export/zzz
  zzz | storage:/pool/zzz

+ Result
1. /proj/zzz is NOT mounted, as well as /export/zzz
2. Other /proj/folders are all mounted as expected. 
3. Other hosts (w/o custom auto.master, auto.proj) mount as /proj/zzz

Is this currently supported by sssd anyway? 
Thanks
Zarko