This refactor cleans up downloadAll's validation, download, and save
logic:
1. A temporary directory is created, and removed after all references to
the struct have been dropped via `defer`
2. Any local dependencies in the `charts` directory are kept intact and validated
3. Charts that have been updated are moved to the `charts` directory
This refactor has a number of improvements, including:
- tmpCharts is removed after execution
- no remote charts are downloaded to destPath: they are all pulled into
tmpPath, validated, then moved to destPath
- lots of code cleanup/improvements, like the `if` block checking
whether the `charts` directory was actually not a directory. In some
cases it could be checking a `nil` object, causing a runtime panic.
- the cyclomatic complexity of the code was simplified
- extra (and in some cases, dangerous) calls to `os.RemoveAll` have been
refactored, cleaning the code and preventing certain failure cases.
A test has been provided to demonstrate the tmpCharts removal issue has
been fixed.
Signed-off-by: Matthew Fisher <matt.fisher@microsoft.com>
Matthew Fisher
4b23d0a25b