This PR builds on #1913 to demonstrate how it might be used. With this, the PSS returns the following when the cache is unable to authenticate with the origin:
```
[ERROR] Server responded with an error: [3030] Unable to open /user/ligo/test_access/access_ligo; invalid exchange (Failed to open file in cache: invalid exchange)
```
Note that it generates a lousy message ("invalid exchange") because EAUTH maps to a EBADE on Linux. I'll fix that in a follow-up PR.
With this approach, we could continue digging through the `XrdPosix` layer to generate a better error message there as well. However, I just wanted to illustrate what the new XrdOss API usage would look like.
@osschar
You can view, comment on, or merge this pull request online at:
https://github.com/xrootd/xrootd/pull/1915
-- Commit Summary --
* Add an error object to XrdOss.
* Add advanced error reporting support to the OFS
* Advanced error message generation for the PSS
-- File Changes --
M src/XrdOfs/XrdOfs.cc (40)
M src/XrdOfs/XrdOfs.hh (3)
M src/XrdOfs/XrdOfsConfig.cc (4)
M src/XrdOss/XrdOss.cc (16)
M src/XrdOss/XrdOss.hh (35)
M src/XrdOuc/XrdOucErrInfo.hh (19)
M src/XrdPss/XrdPss.cc (10)
M src/XrdPss/XrdPss.hh (6)
-- Patch Links --
https://github.com/xrootd/xrootd/pull/1915.patch
https://github.com/xrootd/xrootd/pull/1915.diff
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