libnfsidmap-regex package broken in current LTS release (focal)

[Thimo E]

Dear professionals,

When using the regex translation method for idmapping, idmapd complains about an unresolved symbol (nfsidmap_config_get) in the regex.so shared object:

systemctl status -l nfs-idmapd.service
● nfs-idmapd.service - NFSv4 ID-name mapping service
     Loaded: loaded (/lib/systemd/system/nfs-idmapd.service; static; vendor preset: enabled)
     Active: failed (Result: exit-code) since Thu 2021-02-04 13:51:52 CET; 22min ago
    Process: 43954 ExecStart=/usr/sbin/rpc.idmapd $RPCIDMAPDARGS (code=exited, status=1/FAILURE)

Feb 04 13:51:52 defil37 rpc.idmapd[43954]: sss_nfs_init: use memcache: 1
Feb 04 13:51:52 defil37 rpc.idmapd[43954]: libnfsidmap: loaded plugin /lib/x86_64-linux-gnu/libnfsidmap/sss.so for method sss
Feb 04 13:51:52 defil37 rpc.idmapd[43954]: libnfsidmap: Unable to load plugin: /lib/x86_64-linux-gnu/libnfsidmap/regex.so: undefined symbol: nfsidmap_config_get
Feb 04 13:51:52 defil37 rpc.idmapd[43954]: libnfsidmap: requested translation method, 'regex', is not available
Feb 04 13:51:52 defil37 rpc.idmapd[43954]: rpc.idmapd: libnfsidmap: Unable to load plugin: /lib/x86_64-linux-gnu/libnfsidmap/regex.so: undefined symbol: nfsidmap_config_get
Feb 04 13:51:52 defil37 rpc.idmapd[43954]: rpc.idmapd: libnfsidmap: requested translation method, 'regex', is not available
Feb 04 13:51:52 defil37 rpc.idmapd[43954]: rpc.idmapd: Unable to create name to user id mappings.
Feb 04 13:51:52 defil37 systemd[1]: nfs-idmapd.service: Control process exited, code=exited, status=1/FAILURE
Feb 04 13:51:52 defil37 systemd[1]: nfs-idmapd.service: Failed with result 'exit-code'.
Feb 04 13:51:52 defil37 systemd[1]: Failed to start NFSv4 ID-name mapping service.

This symbol obviously does not exist in the libnfsidmap.so.0.3.0 shared object:
readelf -s /usr/lib/x86_64-linux-gnu/libnfsidmap.so.0.3.0 | grep nfsidmap_config_get
<Nothing>

When checking the sources at https://github.com/isginf/libnfsidmap-regex/blob/1179b2ec3392c91a40da228afada46fd210113a2/regex.c#L57 it seems this library is accidentally using the wrong interface since the symbol "conf_get_str" exists in libnfsidmap.so.0.3.0.

Since the groovy version of the package "libnfsidmap-regex" did not raise the dependencies, I also checked this one and could verify that it:
 a) uses the "conf_get_str" function
 b) loads cleanly

I would like to ask you to either re-compile this package correctly or publish the groovy package version also for focal.

[Lenin (gagarin)]

would be great if you could test https://packages.debian.org/source/experimental/nfs-utils

[Thimo E (thimoe)]

Unfortunately, my glibc on Ubuntu 20.04 is too old:
rpc.idmapd: libnfsidmap: Unable to load plugin: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.33' not found (required by /lib/x86_64-linux-gnu/libnfsidmap/regex.so)

mememe@deatcsXXXfcYYY:/# dpkg-query --showformat=\${Version} --show libc6
2.31-0ubuntu9.42.31-0ubuntu9.4

A dry run analysis LGTM:

mememe@deatcsXXXfcYYY:/# readelf -s /tmp/nfsidmap-test/libnfsidmap.so.1.0.0 | egrep 'nfsidmap_config_get|conf_get_str'
    78: 00000000000041f0 10 FUNC GLOBAL DEFAULT 12 nfsidmap_config_get
mememe@deatcsXXXfcYYY:/# readelf -s /tmp/nfsidmap-test/libnfsidmap/regex.so | egrep 'nfsidmap_config_get|conf_get_str'
    12: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND nfsidmap_config_get