base on A helm plugin that shows a diff explaining what a helm upgrade would change # Helm Diff Plugin [](https://goreportcard.com/report/github.com/databus23/helm-diff) [](https://godoc.org/github.com/databus23/helm-diff) [](https://github.com/databus23/helm-diff/blob/master/LICENSE) This is a Helm plugin giving you a preview of what a `helm upgrade` would change. It basically generates a diff between the latest deployed version of a release and a `helm upgrade --debug --dry-run`. This can also be used to compare two revisions/versions of your helm release. <a href="https://asciinema.org/a/105326" target="_blank"><img src="https://asciinema.org/a/105326.png" /></a> ## Install ### Using Helm plugin manager (> 2.3.x) ```shell helm plugin install https://github.com/databus23/helm-diff ``` ### Pre Helm 2.3.0 Installation Pick a release tarball from the [releases](https://github.com/databus23/helm-diff/releases) page. Unpack the tarball in your helm plugins directory (`$(helm home)/plugins`). E.g. ``` curl -L $TARBALL_URL | tar -C $(helm home)/plugins -xzv ``` ### From Source #### Prerequisites - GoLang `>= 1.21` Make sure you do not have a version of `helm-diff` installed. You can remove it by running `helm plugin uninstall diff` #### Installation Steps The first step is to download the repository and enter the directory. You can do this via `git clone` or downloading and extracting the release. If you clone via git, remember to checkout the latest tag for the latest release. Next, install the plugin into helm. ```bash make install/helm3 ``` ## Usage ``` 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 --skip-schema-validation disables rendered templates validation against the Kubernetes OpenAPI Schema -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, dyff. 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 --reset-then-reuse-values reset the values to the ones built into the chart, apply the last release's values and merge in any new values. If '--reset-values' or '--reuse-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. ``` ## Commands: ### upgrade: ``` $ 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 --skip-schema-validation skip validation of rendered templates against the Kubernetes OpenAPI Schema -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, dyff. 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 --reset-then-reuse-values reset the values to the ones built into the chart, apply the last release's values and merge in any new values. If '--reset-values' or '--reuse-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" ``` ### release: ``` $ 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, dyff. 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" ``` ### revision: ``` $ 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, dyff. 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" ``` ### rollback: ``` $ 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, dyff. 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" ``` ## Build Clone the repository into your `$GOPATH` and then build it. ``` $ 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 ``` The above will install this plugin into your `$HELM_HOME/plugins` directory. ### Prerequisites - You need to have [Go](http://golang.org) installed. Make sure to set `$GOPATH` ### Running Tests Automated tests are implemented with [*testing*](https://golang.org/pkg/testing/). To run all tests: ``` go test -v ./... ``` ## Release Bump `version` in `plugin.yaml`: ``` $ code plugin.yaml $ git commit -m 'Bump helm-diff version to 3.x.y' ``` Set `GITHUB_TOKEN` and run: ``` $ make docker-run-release ``` ", Assign "at most 3 tags" to the expected json: {"id":"5873","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"