Add prestage support to the client #1603
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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.
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Note: patch requires the following XRootD fix to work: xrootd/xrootd#2348 |
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The new
pelican object prestagecommand (and the correspondingpublic 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.