When trying to build any package locally, using osc, opening wallet and providing root password, everything seems to be correct, but it complains about unable to prepare topdir.
4s] now finalizing build dir...
4s] su: cannot open session: Module is unknown
4s] Error: TOPDIR empty
4s]
4s] localhost.localdomain failed "build BonsoleRTA-client-gui-backend.spec" at Mon Jun 14 18:0
2:21 UTC 2021.
4s]
The buildroot was: /var/tmp/build-root/openSUSE_Tumbleweed-x86_64
Hi
Is oscrc configured? I just use visudo and add /usr/bin/build with nopassword for my user. Likewise I point to my own location for building packages.
I think not, but I thought it is, because I use OSC and remember I configured it. 
ls ~/.osc*
home/slawomir/.osc_cookiejar /home/slawomir/.osc.projects
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Edit:
Sorry, it was, but in ~/.config/osc/oscrc
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[FONT=monospace][FONT=monospace][https://api.opensuse.org]
# set aliases for this apiurl
# aliases = foo, bar
# real name used in .changes, unless the one from osc meta prj <user> will be used
# realname =
# email used in .changes, unless the one from osc meta prj <user> will be used
# email =
# additional headers to pass to a request, e.g. for special authentication
#http_headers = Host: foofoobar,
# User: mumblegack
# Plain text password
#pass =
user=*
credentials_mgr_class=osc.credentials.KeyringCredentialsManager:keyring.backends.kwallet.DBusKeyring
trusted_prj=openSUSE:Tumbleweed
But important is keyring (KWallet) is invoked and I allow to obtain authentication information.
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Hi
At the top of the file, I use;
# Downloaded packages are cached here. Must be writable by you.
packagecachedir = /data/repositories/osbuild-packagecache
# Wrapper to call build as root (sudo, su -, ...)
# Use visudo <username> ALL = NOPASSWD: /usr/bin/build
su-wrapper = sudo
# Note create build-root as root user...
# drwxr-xr-x 20 root root 4096 Jun 13 21:25 build-root
build-root = /data/build-root
I removed /var/tmp/build-root/* type osc build and everything work.
Thanks!