"fatal: not a git repository" after installing plugin

 cinc-auditor plugin install train-juniper
Fetching net-ssh-7.3.2.gem
Fetching ffi-1.17.4-x86_64-linux-gnu.gem
Fetching train-juniper-0.8.0.gem
fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
fatal: not a git repository: 'ext/ffi_c/libffi/.git'
fatal: not a git repository: 'ext/ffi_c/libffi/.git'
fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
train-juniper plugin, version 0.8.0, installed from rubygems.org
[earonne@tss-jump ~]$ cinc-auditor plugin list
fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
fatal: not a git repository: 'ext/ffi_c/libffi/.git'
fatal: not a git repository: 'ext/ffi_c/libffi/.git'
fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
fatal: not a git repository: 'ext/ffi_c/libffi/.git'
fatal: not a git repository: 'ext/ffi_c/libffi/.git'
fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
┌────────────────────────────────────────┬─────────┬──────────────┬─────────┬────────────────────────────────────────────────────────────────────────┐
│              Plugin Name               │ Version │     Via      │ ApiVer  │                              Description                               │
├────────────────────────────────────────┼─────────┼──────────────┼─────────┼────────────────────────────────────────────────────────────────────────┤
│ inspec-compliance                      │ 7.0.107 │ core         │ 2       │ Plugin to perform operations with Chef Automate                        │
│ inspec-habitat                         │ 7.0.107 │ core         │ 2       │ Plugin to create/upload habitat package                                │
│ inspec-init                            │ 7.0.107 │ core         │ 2       │ Plugin for scaffolding profile, plugin or a resource                   │
│ inspec-license                         │ 7.0.107 │ core         │ 2       │ Plugin to list user licenses.                                          │
│ inspec-parallel                        │ 7.0.107 │ core         │ 2       │ Plugin to handle parallel InSpec scan operations over multiple targets │
│ inspec-plugin-manager-cli              │ 7.0.107 │ core         │ 2       │ CLI plugin for InSpec                                                  │
│ inspec-reporter-html2                  │ 7.0.107 │ core         │ 2       │ Improved HTML reporter plugin                                          │
│ inspec-reporter-json-min               │ 7.0.107 │ core         │ 2       │ Json-min json reporter plugin                                          │
│ inspec-reporter-junit                  │ 7.0.107 │ core         │ 2       │ JUnit XML reporter plugin                                              │
│ inspec-sign                            │ 7.0.107 │ core         │ 2       │                                                                        │
│ inspec-streaming-reporter-progress-bar │ 7.0.107 │ core         │ 2       │ Displays a real-time progress bar and control title as output          │
│ inspec-supermarket                     │ 7.0.107 │ core         │ 0       │                                                                        │
│ train-aws                              │ 0.2.44  │ gem (system) │ train-1 │ AWS API Transport for Train                                            │
│ train-habitat                          │ 0.2.22  │ gem (system) │ train-1 │ Habitat API Transport for Train                                        │
│ train-juniper                          │ 0.8.0   │ gem (user)   │ train-1 │ Train transport for Juniper Networks JunOS devices                     │
│ train-kubernetes                       │ 0.3.1   │ gem (system) │ train-1 │ Train Kubernetes                                                       │
│ train-winrm                            │ 0.4.3   │ gem (system) │ train-1 │ Windows WinRM API Transport for Train                                  │
└────────────────────────────────────────┴─────────┴──────────────┴─────────┴────────────────────────────────────────────────────────────────────────┘
 17 plugin(s) total

Reproduce the problem with cinc-auditor plugin install train-juniper and cinc-auditor plugin list from a directory that is not a Git repository. Trace the plugin installation and listing entry points to identify why Git commands run there; done means both commands complete without the reported errors while the plugin remains installed and listed.