When using XRootD 5.2 in CERN OpenShift I've seen the following segfault in gfal2:
```
[2021-05-25 12:29:06.201028 +0000][Debug ][Utility ] Initializing xrootd client version: v5.2.0
[2021-05-25 12:29:06.201312 +0000][Warning][Utility ] Unable to process global config file: [ERROR] OS Error: no such file or directory
[2021-05-25 12:29:06.201378 +0000][Debug ][Utility ] Unable to find user home directory.
[2021-05-25 12:29:06.201553 +0000][Debug ][PlugInMgr ] Initializing plug-in manager...
[2021-05-25 12:29:06.201563 +0000][Debug ][PlugInMgr ] No default plug-in, loading plug-in configs...
[2021-05-25 12:29:06.201585 +0000][Debug ][PlugInMgr ] Processing plug-in definitions in /etc/xrootd/client.plugins.d...
[2021-05-25 12:29:06.201596 +0000][Debug ][PlugInMgr ] Unable to process directory /etc/xrootd/client.plugins.d: [ERROR] OS Error: no such file or directory
Thread 1 "python" received signal SIGSEGV, Segmentation fault.
0x00007f60553dd5d8 in XrdCl::PlugInManager::ProcessEnvironmentSettings() () from /tmp/env/lib/gfal2-plugins//../libXrdCl.so.3
```
The issue is that the user ID is randomised and is therefore missing from the `/etc/passwd` file and it looks like 597509497b59608bf8c0f104bdec5d1b2a5c29b2 forgot to invert the if condition. Presumably this also causes another bug with user plugins being ignored.
You can view, comment on, or merge this pull request online at:
https://github.com/xrootd/xrootd/pull/1463
-- Commit Summary --
* [XrdCl] Only use the passwd file if a valid entry is found
-- File Changes --
M src/XrdCl/XrdClPlugInManager.cc (2)
-- Patch Links --
https://github.com/xrootd/xrootd/pull/1463.patch
https://github.com/xrootd/xrootd/pull/1463.diff
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