* fix(helm): fix golint warning due to ApiVersionV1 constant name

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

* fix(helm): fix golint warning due to ResolveChartVersionAndGetRepo comment

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

* fix(helm): fix golint warnings on HttpGetter type and SetCredentials method missing a comment

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

* fix(helm):fix golint warning due to comment on FindChartInAuthRepoURL function

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

* fix(helm): fix golint warning due to RepoFile type name

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

* fix(helm): fix golint warning due to ParseString comment

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

Authentication support for remote charts repositories.

When a user enters a non-URL (such as stable)
in requirements.yaml and tries to `helm dep up`,
they get a potentially confusing error message.
This tries to make the error message clearer.

Closes #2672

* Closes #2937
Added required dependency to run make test in developer's guide

* Fixed base URL appending when chart address is not absolute

* Removed requirement from developers.md

* Fixed unnecessary line breaks

* Added tests for query string repo

* Returning URL along with error

In Helm 2.6.0, the new delete feature that deletes old versions of
charts is deleting subcharts that aren't in requirements.yaml.
In this patch, I judge the dependency whether it is included in the
requirements.yaml before deleting it.

Closes #2830

This change changes the order of operations in
pkg/downloader.Manager.downloadAll

Old charts are moved to tmp directory which is restored in case any
dependency update fails. Otherwise tmp dir is deleted.

When a repository is generated without --url, the packages in that
repository do not have FQDNs. In this case, the URL prefix (FQDN plus
base path) should be derived from the repository's base URL. This seems
to be a regression that crept in around Helm 2.2.0. This is now fixed.

Closes #2315
Closes #2510

2.4.0 stopped installing development versions by default. This allows
the user to re-enable that support by setting --devel.

Closes #2407

This flattens the getter package tree, adds tests, and changes a little
bit of the terminology to follow Go idioms. This also makes much of the
getter API private to begin with. This will give us more flexibility in
the future.

It is now possible to create plugins with chart download capabilities for custom, non-http protocols.
Furthermore it is possible to reuse helm packages to implement alternative clients with these custom downloader functions.

support repo alias in requirements.yaml
The syntax should be like: "alias:reponame" or "@reponame".

closes: #1985

closes bug: 2103

When downloader package moved to under /pkg, helmpath functions got called still from it, while it is under /cmd. This commit fixes the issue by moving helmpath after the downloader to have only cmd->pkg and pkg->pkg calls.

Enable --debug flag to print debugging information when use
helm dep update --debug

closes #2020

This makes it possible to do a `dep up` without refetching all of
the repositories.While it's less safe, it's useful when doing many
updates in a short period of time (such as in a CI/CD setting)

Closes #2019

A regression was committed during 2.2.0 that broke the repositories.yaml
file format, switching the cache path from relative to absolute. This
fixes the error.

Closes #1974

fix change requests

The following commands:
helm dep update
helm dep build
are now able to take a requirements.yaml with dependency charts' repo defined as:
file://../local/path or file:///root/path

closes: #1884