curl -L $TARBALL_URL | tar -C $(helm home)/plugins -xzv

The Helm Diff Plugin

* Shows a diff explaining what a helm upgrade would change:
    This fetches the currently deployed version of a release
  and compares it to a local chart plus values. This can be 
  used to visualize what changes a helm upgrade will perform.

* Shows a diff explaining what had changed between the two revisions:
    This fetches previously deployed versions of a release
  and compares them. This can be used to visualize what changes 
  were made during revision change.

* Shows a diff explaining what a helm rollback would change:
    This fetches the currently deployed version of a release
  and compares it to the previously deployed version of the release that you 
  want to rollback. This can be used to visualize what changes a 
  helm rollback will perform.

Usage:
  diff [flags]
  diff [command]

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  release     Shows diff between release's manifests
  revision    Shows diff between revision's manifests
  rollback    Show a diff explaining what a helm rollback could perform
  upgrade     Show a diff explaining what a helm upgrade would change.
  version     Show version of the helm diff plugin

Flags:
      --allow-unreleased                 enables diffing of releases that are not yet deployed via Helm
  -a, --api-versions stringArray         Kubernetes api versions used for Capabilities.APIVersions
      --color                            color output. You can control the value for this flag via HELM_DIFF_COLOR=[true|false]. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"
  -C, --context int                      output NUM lines of context around changes (default -1)
      --detailed-exitcode                return a non-zero exit code when there are changes
      --devel                            use development versions, too. Equivalent to version '>0.0.0-0'. If --version is set, this is ignored.
      --disable-openapi-validation       disables rendered templates validation against the Kubernetes OpenAPI Schema
      --disable-validation               disables rendered templates validation against the Kubernetes cluster you are currently pointing to. This is the same validation performed on an install
      --dry-run                          disables cluster access and show diff as if it was install. Implies --install, --reset-values, and --disable-validation
      --enable-dns                       enable DNS lookups when rendering templates 
  -D, --find-renames float32             Enable rename detection if set to any value greater than 0. If specified, the value denotes the maximum fraction of changed content as lines added + removed compared to total lines in a diff for considering it a rename. Only objects of the same Kind are attempted to be matched
  -h, --help                             help for diff
      --include-tests                    enable the diffing of the helm test hooks
      --install                          enables diffing of releases that are not yet deployed via Helm (equivalent to --allow-unreleased, added to match "helm upgrade --install" command
      --kube-version string              Kubernetes version used for Capabilities.KubeVersion
      --kubeconfig string                This flag is ignored, to allow passing of this top level flag to helm
      --no-color                         remove colors from the output. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"
      --no-hooks                         disable diffing of hooks
      --normalize-manifests              normalize manifests before running diff to exclude style differences from the output
      --output string                    Possible values: diff, simple, template. When set to "template", use the env var HELM_DIFF_TPL to specify the template. (default "diff")
      --post-renderer string             the path to an executable to be used for post rendering. If it exists in $PATH, the binary will be used, otherwise it will try to look for the executable at the given path
      --post-renderer-args stringArray   an argument to the post-renderer (can specify multiple)
      --repo string                      specify the chart repository url to locate the requested chart
      --reset-values                     reset the values to the ones built into the chart and merge in any new values
      --reuse-values                     reuse the last release's values and merge in any new values. If '--reset-values' is specified, this is ignored
      --set stringArray                  set values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)
      --set-file stringArray             set values from respective files specified via the command line (can specify multiple or separate values with commas: key1=path1,key2=path2)
      --set-string stringArray           set STRING values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)
      --show-secrets                     do not redact secret values in the output
      --strip-trailing-cr                strip trailing carriage return on input
      --suppress stringArray             allows suppression of the kinds listed in the diff output (can specify multiple, like '--suppress Deployment --suppress Service')
  -q, --suppress-secrets                 suppress secrets in the output
      --three-way-merge                  use three-way-merge to compute patch and generate diff output
  -f, --values valueFiles                specify values in a YAML file (can specify multiple) (default [])
      --version string                   specify the exact chart version to use. If this is not specified, the latest version is used

Additional help topics:
  diff            

Use "diff [command] --help" for more information about a command.

$ helm diff upgrade -h
Show a diff explaining what a helm upgrade would change.

This fetches the currently deployed version of a release
and compares it to a chart plus values.
This can be used to visualize what changes a helm upgrade will
perform.

Usage:
  diff upgrade [flags] [RELEASE] [CHART]

Examples:
  helm diff upgrade my-release stable/postgresql --values values.yaml

  # Set HELM_DIFF_IGNORE_UNKNOWN_FLAGS=true to ignore unknown flags
  # It's useful when you're using `helm-diff` in a `helm upgrade` wrapper.
  # See https://github.com/databus23/helm-diff/issues/278 for more information.
  HELM_DIFF_IGNORE_UNKNOWN_FLAGS=true helm diff upgrade my-release stable/postgres --wait

  # helm-diff disallows the use of the `lookup` function by default.
  # To enable it, you must set HELM_DIFF_USE_INSECURE_SERVER_SIDE_DRY_RUN=true to
  # use `helm template --dry-run=server` or
  # `helm upgrade --dry-run=server` (in case you also set `HELM_DIFF_USE_UPGRADE_DRY_RUN`)
  # See https://github.com/databus23/helm-diff/pull/458
  # for more information.
  HELM_DIFF_USE_INSECURE_SERVER_SIDE_DRY_RUN=true helm diff upgrade my-release datadog/datadog

  # Set HELM_DIFF_USE_UPGRADE_DRY_RUN=true to
  # use `helm upgrade --dry-run` instead of `helm template` to render manifests from the chart.
  # See https://github.com/databus23/helm-diff/issues/253 for more information.
  HELM_DIFF_USE_UPGRADE_DRY_RUN=true helm diff upgrade my-release datadog/datadog

  # Set HELM_DIFF_THREE_WAY_MERGE=true to
  # enable the three-way-merge on diff.
  # This is equivalent to specifying the --three-way-merge flag.
  # Read the flag usage below for more information on --three-way-merge.
  HELM_DIFF_THREE_WAY_MERGE=true helm diff upgrade my-release datadog/datadog

  # Set HELM_DIFF_NORMALIZE_MANIFESTS=true to
  # normalize the yaml file content when using helm diff.
  # This is equivalent to specifying the --normalize-manifests flag.
  # Read the flag usage below for more information on --normalize-manifests.
  HELM_DIFF_NORMALIZE_MANIFESTS=true helm diff upgrade my-release datadog/datadog

  # Set HELM_DIFF_OUTPUT_CONTEXT=n to configure the output context to n lines.
  # This is equivalent to specifying the --context flag.
  # Read the flag usage below for more information on --context.
  HELM_DIFF_OUTPUT_CONTEXT=5 helm diff upgrade my-release datadog/datadog

Flags:
      --allow-unreleased                 enables diffing of releases that are not yet deployed via Helm
  -a, --api-versions stringArray         Kubernetes api versions used for Capabilities.APIVersions
  -C, --context int                      output NUM lines of context around changes (default -1)
      --detailed-exitcode                return a non-zero exit code when there are changes
      --devel                            use development versions, too. Equivalent to version '>0.0.0-0'. If --version is set, this is ignored.
      --disable-openapi-validation       disables rendered templates validation against the Kubernetes OpenAPI Schema
      --disable-validation               disables rendered templates validation against the Kubernetes cluster you are currently pointing to. This is the same validation performed on an install
      --dry-run                          disables cluster access and show diff as if it was install. Implies --install, --reset-values, and --disable-validation
      --enable-dns                       enable DNS lookups when rendering templates 
  -D, --find-renames float32             Enable rename detection if set to any value greater than 0. If specified, the value denotes the maximum fraction of changed content as lines added + removed compared to total lines in a diff for considering it a rename. Only objects of the same Kind are attempted to be matched
  -h, --help                             help for upgrade
      --include-tests                    enable the diffing of the helm test hooks
      --install                          enables diffing of releases that are not yet deployed via Helm (equivalent to --allow-unreleased, added to match "helm upgrade --install" command
      --kube-version string              Kubernetes version used for Capabilities.KubeVersion
      --kubeconfig string                This flag is ignored, to allow passing of this top level flag to helm
      --no-hooks                         disable diffing of hooks
      --normalize-manifests              normalize manifests before running diff to exclude style differences from the output
      --output string                    Possible values: diff, simple, template. When set to "template", use the env var HELM_DIFF_TPL to specify the template. (default "diff")
      --post-renderer string             the path to an executable to be used for post rendering. If it exists in $PATH, the binary will be used, otherwise it will try to look for the executable at the given path
      --post-renderer-args stringArray   an argument to the post-renderer (can specify multiple)
      --repo string                      specify the chart repository url to locate the requested chart
      --reset-values                     reset the values to the ones built into the chart and merge in any new values
      --reuse-values                     reuse the last release's values and merge in any new values. If '--reset-values' is specified, this is ignored
      --set stringArray                  set values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)
      --set-file stringArray             set values from respective files specified via the command line (can specify multiple or separate values with commas: key1=path1,key2=path2)
      --set-string stringArray           set STRING values on the command line (can specify multiple or separate values with commas: key1=val1,key2=val2)
      --show-secrets                     do not redact secret values in the output
      --strip-trailing-cr                strip trailing carriage return on input
      --suppress stringArray             allows suppression of the values listed in the diff output
  -q, --suppress-secrets                 suppress secrets in the output
      --three-way-merge                  use three-way-merge to compute patch and generate diff output
  -f, --values valueFiles                specify values in a YAML file (can specify multiple) (default [])
      --version string                   specify the exact chart version to use. If this is not specified, the latest version is used

Global Flags:
      --color      color output. You can control the value for this flag via HELM_DIFF_COLOR=[true|false]. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"
      --no-color   remove colors from the output. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"

$ helm diff release -h

This command compares the manifests details of a different releases created from the same chart

It can be used to compare the manifests of

 - release1 with release2
	$ helm diff release [flags] release1 release2
   Example:
	$ helm diff release my-prod my-stage

Usage:
  diff release [flags] RELEASE release1 [release2]

Flags:
  -C, --context int            output NUM lines of context around changes (default -1)
      --detailed-exitcode      return a non-zero exit code when there are changes
  -D, --find-renames float32   Enable rename detection if set to any value greater than 0. If specified, the value denotes the maximum fraction of changed content as lines added + removed compared to total lines in a diff for considering it a rename. Only objects of the same Kind are attempted to be matched
  -h, --help                   help for release
      --include-tests          enable the diffing of the helm test hooks
      --normalize-manifests    normalize manifests before running diff to exclude style differences from the output
      --output string          Possible values: diff, simple, template. When set to "template", use the env var HELM_DIFF_TPL to specify the template. (default "diff")
      --show-secrets           do not redact secret values in the output
      --strip-trailing-cr      strip trailing carriage return on input
      --suppress stringArray   allows suppression of the values listed in the diff output
  -q, --suppress-secrets       suppress secrets in the output

Global Flags:
      --color      color output. You can control the value for this flag via HELM_DIFF_COLOR=[true|false]. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"
      --no-color   remove colors from the output. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"

$ helm diff revision -h

This command compares the manifests details of a named release.

It can be used to compare the manifests of

 - latest REVISION with specified REVISION
	$ helm diff revision [flags] RELEASE REVISION1
   Example:
	$ helm diff revision my-release 2

 - REVISION1 with REVISION2
	$ helm diff revision [flags] RELEASE REVISION1 REVISION2
   Example:
	$ helm diff revision my-release 2 3

Usage:
  diff revision [flags] RELEASE REVISION1 [REVISION2]

Flags:
  -C, --context int            output NUM lines of context around changes (default -1)
      --detailed-exitcode      return a non-zero exit code when there are changes
  -D, --find-renames float32   Enable rename detection if set to any value greater than 0. If specified, the value denotes the maximum fraction of changed content as lines added + removed compared to total lines in a diff for considering it a rename. Only objects of the same Kind are attempted to be matched
  -h, --help                   help for revision
      --include-tests          enable the diffing of the helm test hooks
      --normalize-manifests    normalize manifests before running diff to exclude style differences from the output
      --output string          Possible values: diff, simple, template. When set to "template", use the env var HELM_DIFF_TPL to specify the template. (default "diff")
      --show-secrets           do not redact secret values in the output
      --strip-trailing-cr      strip trailing carriage return on input
      --suppress stringArray   allows suppression of the values listed in the diff output
  -q, --suppress-secrets       suppress secrets in the output

Global Flags:
      --color      color output. You can control the value for this flag via HELM_DIFF_COLOR=[true|false]. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"
      --no-color   remove colors from the output. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"

$ helm diff rollback -h

This command compares the latest manifest details of a named release
with specific revision values to rollback.

It forecasts/visualizes changes, that a helm rollback could perform.

Usage:
  diff rollback [flags] [RELEASE] [REVISION]

Examples:
  helm diff rollback my-release 2

Flags:
  -C, --context int            output NUM lines of context around changes (default -1)
      --detailed-exitcode      return a non-zero exit code when there are changes
  -D, --find-renames float32   Enable rename detection if set to any value greater than 0. If specified, the value denotes the maximum fraction of changed content as lines added + removed compared to total lines in a diff for considering it a rename. Only objects of the same Kind are attempted to be matched
  -h, --help                   help for rollback
      --include-tests          enable the diffing of the helm test hooks
      --normalize-manifests    normalize manifests before running diff to exclude style differences from the output
      --output string          Possible values: diff, simple, template. When set to "template", use the env var HELM_DIFF_TPL to specify the template. (default "diff")
      --show-secrets           do not redact secret values in the output
      --strip-trailing-cr      strip trailing carriage return on input
      --suppress stringArray   allows suppression of the values listed in the diff output
  -q, --suppress-secrets       suppress secrets in the output

Global Flags:
      --color      color output. You can control the value for this flag via HELM_DIFF_COLOR=[true|false]. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"
      --no-color   remove colors from the output. If both --no-color and --color are unspecified, coloring enabled only when the stdout is a term and TERM is not "dumb"

$ mkdir -p $GOPATH/src/github.com/databus23/
$ cd $GOPATH/src/github.com/databus23/
$ git clone https://github.com/databus23/helm-diff.git
$ cd helm-diff
$ make install

go test -v ./...

$ code plugin.yaml
$ git commit -m 'Bump helm-diff version to 3.x.y'

$ make docker-run-release