Add "third party copy" mode #1604
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The cache plugin directory is controlled by environment variable. If the environment variable is set in the `pelican` environment, pass its value along to xrootd. Simplifies testing in environments where the plugin is not installed as root.
The new `pelican object prestage` command (and the corresponding public APIs) allow a user to trigger the prestaging of data to a specific cache. The prestage itself is not intelligent: it checks to see if a file is already present and, if not, it triggers a full download. Future work may extend this on the Pelican-side so there's a control interface exposed that triggers prestaging without data movement all the way to the client. Includes unit tests and some modest refactoring. Given the current LIGO origins don't have the collections URL set (and I wanted to test it out), this also provides the ability to override the collections URL on the CLI.
Fix unit test, make the copy implementation look more like prestaging with a separate `NewCopyJob` method.
bbockelm
added
enhancement
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This adds initial support for so-called "third party copy" mode, where the client (the "third party") triggers a transfer from a Pelican data federation to an origin. This will eventually support large-scale bulk transfers but, for now, it simply rounds out the
client.DoCopymethod: one can copy from apelican://URL to apelican://URL.Given the client churn in #1603 (and given #1603 similarly adds new client functionality, working in the same part of the code), this was built on top of that PR. We should merge this only after that has gone through.