Unable to install on Shibboleth IDP version 4.2.1_20220517

[guthy]

Error installing plugin

I am unable to install the plugin, plugin.sh gives the error

ERROR  - Too many packages in distributions /tmp/plugin-installer-download7056747998452045926/shibboleth-redis-storage-service-2.0.0-SNAPSHOT.tar.gz
ERROR  -  Plugin Install failed: Too many packages in distributions

Following steps were :

• Clone this git repository
• Create a signing key via gpg
• build the software, sign it via ./gradlew sign distZip -Psigning.secretKeyRingFile=/somewhere -Psigning.password=somepassword -Psigning.keyId=someid
• following files were created:

[root@f7a711f7cf72 distributions]# ls -l /shibboleth-redis-storage-service/build/distributions
total 17832
-rw-r--r-- 1 root root 9123386 Jun  1 08:32 shibboleth-redis-storage-service-2.0.0-SNAPSHOT.tar.gz
-rw-r--r-- 1 root root     475 Jun  1 08:32 shibboleth-redis-storage-service-2.0.0-SNAPSHOT.tar.gz.asc
-rw-r--r-- 1 root root 9124005 Jun  1 08:32 shibboleth-redis-storage-service-2.0.0-SNAPSHOT.zip
-rw-r--r-- 1 root root     475 Jun  1 08:32 shibboleth-redis-storage-service-2.0.0-SNAPSHOT.zip.asc

• using plugin.sh to install plugin: /opt/shibboleth-idp/bin/plugin.sh -i /shibboleth-redis-storage-service/build/distributions/shibboleth-redis-storage-service-2.0.0-SNAPSHOT.tar.gz - this gives the error:

[root@f7a711f7cf72 distributions]# /opt/shibboleth-idp/bin/plugin.sh -i /shibboleth-redis-storage-service/build/distributions/shibboleth-redis-storage-service-2.0.0-SNAPSHOT.tar.gz
INFO  - Including auto-located properties in /opt/shibboleth-idp/bin/../conf/admin/admin.properties
INFO  - Including auto-located properties in /opt/shibboleth-idp/bin/../conf/ldap.properties
INFO  - Including auto-located properties in /opt/shibboleth-idp/bin/../conf/authn/authn.properties
INFO  - Including auto-located properties in /opt/shibboleth-idp/bin/../conf/services.properties
INFO  - Including auto-located properties in /opt/shibboleth-idp/bin/../conf/saml-nameid.properties
INFO  - Including auto-located properties in /opt/shibboleth-idp/bin/../conf/c14n/subject-c14n.properties
ERROR  - Too many packages in distributions /shibboleth-redis-storage-service/build/distributions/shibboleth-redis-storage-service-2.0.0-SNAPSHOT.tar.gz
ERROR  -  Plugin Install failed: Too many packages in distributions

I also tried hosting the generated files on a webserver and including an plugins.properties file (analogue to https://shibboleth.net/downloads/identity-provider/plugins/plugins.properties) with the same error.

The generated tar.gz file contains following files:

[root@f7a711f7cf72 distributions]# tar tvf shibboleth-redis-storage-service-2.0.0-SNAPSHOT.tar.gz
drwxrwxr-x 0/0               0 2022-05-18 09:25 webapp/
drwxrwxr-x 0/0               0 2022-05-18 09:25 webapp/WEB-INF/
drwxrwxr-x 0/0               0 2022-06-01 08:32 webapp/WEB-INF/lib/
-rw-r--r-- 0/0          512597 2022-06-01 08:32 webapp/WEB-INF/lib/netty-handler-4.1.65.Final.jar
-rw-r--r-- 0/0           41381 2022-06-01 08:32 webapp/WEB-INF/lib/jackson-dataformat-yaml-2.9.8.jar
-rw-r--r-- 0/0           37009 2022-06-01 08:32 webapp/WEB-INF/lib/netty-resolver-4.1.65.Final.jar
-rw-r--r-- 0/0           60686 2022-06-01 08:32 webapp/WEB-INF/lib/commons-logging-1.1.1.jar
-rw-r--r-- 0/0          326099 2022-06-01 08:32 webapp/WEB-INF/lib/netty-codec-4.1.65.Final.jar
-rw-r--r-- 0/0            7145 2022-06-01 08:32 webapp/WEB-INF/lib/shibboleth-redis-storage-service-2.0.0-SNAPSHOT.jar
-rw-r--r-- 0/0          120925 2022-06-01 08:32 webapp/WEB-INF/lib/jodd-bean-3.7.1.jar
-rw-r--r-- 0/0         1441943 2022-06-01 08:32 webapp/WEB-INF/lib/reactor-core-3.2.3.RELEASE.jar
-rw-r--r-- 0/0          301298 2022-06-01 08:32 webapp/WEB-INF/lib/snakeyaml-1.23.jar
-rw-r--r-- 0/0          300909 2022-06-01 08:32 webapp/WEB-INF/lib/netty-buffer-4.1.65.Final.jar
-rw-r--r-- 0/0          387307 2022-06-01 08:32 webapp/WEB-INF/lib/jodd-core-3.7.1.jar
-rw-r--r-- 0/0          651065 2022-06-01 08:32 webapp/WEB-INF/lib/netty-common-4.1.65.Final.jar
-rw-r--r-- 0/0          362679 2022-06-01 08:32 webapp/WEB-INF/lib/commons-configuration-1.10.jar
-rw-r--r-- 0/0         2282935 2022-06-01 08:32 webapp/WEB-INF/lib/rxjava-2.1.13.jar
-rw-r--r-- 0/0           49789 2022-06-01 08:32 webapp/WEB-INF/lib/cache-api-1.0.0.jar
-rw-r--r-- 0/0           54391 2022-06-01 08:32 webapp/WEB-INF/lib/objenesis-2.5.1.jar
-rw-r--r-- 0/0          395170 2022-06-01 08:32 webapp/WEB-INF/lib/fst-2.56.jar
-rw-r--r-- 0/0         2097765 2022-06-01 08:32 webapp/WEB-INF/lib/redisson-3.10.1.jar
-rw-r--r-- 0/0          478002 2022-06-01 08:32 webapp/WEB-INF/lib/netty-transport-4.1.65.Final.jar
-rw-r--r-- 0/0            2097 2022-06-01 08:32 webapp/WEB-INF/lib/reactive-streams-1.0.2.jar
-rw-r--r-- 0/0           61514 2022-06-01 08:32 webapp/WEB-INF/lib/netty-codec-dns-4.1.65.Final.jar
-rw-r--r-- 0/0          154948 2022-06-01 08:32 webapp/WEB-INF/lib/netty-resolver-dns-4.1.65.Final.jar
drwxrwxr-x 0/0               0 2022-06-01 08:32 bootstrap/
-rw-rw-r-- 0/0             209 2022-06-01 08:32 bootstrap/plugin.properties

Also the zip file contains the same directory structure:

Archive:  shibboleth-redis-storage-service-2.0.0-SNAPSHOT.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
        0  05-18-2022 09:25   webapp/
        0  05-18-2022 09:25   webapp/WEB-INF/
        0  06-01-2022 08:32   webapp/WEB-INF/lib/
   512597  06-01-2022 08:32   webapp/WEB-INF/lib/netty-handler-4.1.65.Final.jar
    41381  06-01-2022 08:32   webapp/WEB-INF/lib/jackson-dataformat-yaml-2.9.8.jar
    37009  06-01-2022 08:32   webapp/WEB-INF/lib/netty-resolver-4.1.65.Final.jar
    60686  06-01-2022 08:32   webapp/WEB-INF/lib/commons-logging-1.1.1.jar
   326099  06-01-2022 08:32   webapp/WEB-INF/lib/netty-codec-4.1.65.Final.jar
     7145  06-01-2022 08:32   webapp/WEB-INF/lib/shibboleth-redis-storage-service-2.0.0-SNAPSHOT.jar
   120925  06-01-2022 08:32   webapp/WEB-INF/lib/jodd-bean-3.7.1.jar
  1441943  06-01-2022 08:32   webapp/WEB-INF/lib/reactor-core-3.2.3.RELEASE.jar
   301298  06-01-2022 08:32   webapp/WEB-INF/lib/snakeyaml-1.23.jar
   300909  06-01-2022 08:32   webapp/WEB-INF/lib/netty-buffer-4.1.65.Final.jar
   387307  06-01-2022 08:32   webapp/WEB-INF/lib/jodd-core-3.7.1.jar
   651065  06-01-2022 08:32   webapp/WEB-INF/lib/netty-common-4.1.65.Final.jar
   362679  06-01-2022 08:32   webapp/WEB-INF/lib/commons-configuration-1.10.jar
  2282935  06-01-2022 08:32   webapp/WEB-INF/lib/rxjava-2.1.13.jar
    49789  06-01-2022 08:32   webapp/WEB-INF/lib/cache-api-1.0.0.jar
    54391  06-01-2022 08:32   webapp/WEB-INF/lib/objenesis-2.5.1.jar
   395170  06-01-2022 08:32   webapp/WEB-INF/lib/fst-2.56.jar
  2097765  06-01-2022 08:32   webapp/WEB-INF/lib/redisson-3.10.1.jar
   478002  06-01-2022 08:32   webapp/WEB-INF/lib/netty-transport-4.1.65.Final.jar
     2097  06-01-2022 08:32   webapp/WEB-INF/lib/reactive-streams-1.0.2.jar
    61514  06-01-2022 08:32   webapp/WEB-INF/lib/netty-codec-dns-4.1.65.Final.jar
   154948  06-01-2022 08:32   webapp/WEB-INF/lib/netty-resolver-dns-4.1.65.Final.jar
        0  06-01-2022 08:32   bootstrap/
      209  06-01-2022 08:32   bootstrap/plugin.properties
---------                     -------
 10127863                     27 files

How can we build the plugin, so it's possible to install it via plugin.sh?