This PR adds the ability to set HTTP headers when downloading
an artifact from an `http` or `https` resource.
The implementation in `go-getter` is such that a new `HTTPGetter`
must be created for each artifact that sets headers (as opposed
to conveniently setting headers per-request). This PR maintains
the memoization of the default Getter objects, creating new ones
only for artifacts where headers are set.
Closes#9306
We recently added documentation disambiguating the terminology of the
allocation/task working directories. This changeset adds an internals document
that describes in more detail exactly what does into the allocation working
directory, how this interacts with the filesystem isolation provided by task
drivers, and how this interacts with features like `artifact` and `template`.
Co-authored-by: Charlie Voiselle <464492+angrycub@users.noreply.github.com>
The terms task directory and allocation directory are used throughout the
documentation but these directories are not the same as the `NOMAD_TASK_DIR`
and `NOMAD_ALLOC_DIR` locations. This is confusing when trying to use the
`template` and `artifact` stanzas, especially when trying to use a destination
outside the Nomad-mounted directories for Docker and similar drivers.
This changeset introduces "allocation working directory" to mean the location
on disk where the various directories and artifacts are staged, and "task
working directory" for the task. Clarify how specific task drivers interact
with the task working directory.
Previously the S3 artifact documentation only referenced using
options populated with access credentails when pulling from a
bucket that required authentication. This change upadtes the doc
to also detail using IAM instance profiles.
