# The `gossfile` configuration

## Goss test creation

Goss tests can be created by using either of following methods.

1. `goss autoadd <resource to test>`
2. `goss add <resource to test>`
3. manually create YAML/JSON test file by hand.

To customize the parameters generated by `goss add` and `goss autoadd` YAML file you need to manually edit it.

`goss add package nginx` will generate below YAML

```yaml
package:
  nginx:
    installed: true
    versions:
    - 1.17.8
```

To test uninstall scenario you would need to manually edit it and set it as below.

```yaml
package:
  nginx:
    installed: false
```

## Important note about goss file format

It is important to note that both YAML and JSON are formats that describe a nested data structure.

```yaml title="WRONG way to write a goss file"
file:
  /etc/httpd/conf/httpd.conf:
    exists: true

service:
  httpd:
    enabled: true
    running: true

file:
  /var/www/html:
    filetype: directory
    exists: true
```

If you try to validate this file, it will **only** run the second `file` test:

```console
$ goss validate --format documentation
File: /var/www/html: exists: matches expectation: [true]
File: /var/www/html: filetype: matches expectation: ["directory"]
Service: httpd: enabled: matches expectation: [true]
Service: httpd: running: matches expectation: [true]

Total Duration: 0.014s
Count: 8, Failed: 0, Skipped: 0
```

As you can see, the first `file` check has not been run because the second `file` entry *overwrites* the previous one.

You need to make sure all the entries of the same type are under the same declaration.

```yaml title="This is the CORRECT way to write a goss file"
file:
  /etc/httpd/conf/httpd.conf:
    exists: true
  /var/www/html:
    filetype: directory
    exists: true

service:
  httpd:
    enabled: true
    running: true
```

Running validate with this configuration will correctly check both files:

```console
$ goss validate --format documentation
File: /var/www/html: exists: matches expectation: [true]
File: /var/www/html: filetype: matches expectation: ["directory"]
File: /etc/httpd/conf/httpd.conf: exists: matches expectation: [true]
Service: httpd: enabled: matches expectation: [true]
Service: httpd: running: matches expectation: [true]

Total Duration: 0.014s
Count: 10, Failed: 0, Skipped: 0
```

Please note that using the `goss add` and `goss autoadd` command will create a valid file,
but if you're writing your files by hand you'll save a lot of time by taking this in consideration.

If you want to keep your tests in separate files, the best way to obtain a single, valid,
file is to create a main goss file that includes the others with the [gossfile](#gossfile) directive
and then [render](cli.md#render) it.

### Schema

A [Json draft 7 schema](https://github.com/json-schema-org/json-schema-spec/blob/draft-07/schema.json)
available at <https://goss.rocks/schema.yaml>
makes it easier to edit simple goss.yaml files in IDEs, providing usual coding assistance
such as inline documentation, completion and static analysis.
See #793 for screenshots.

For example, to configure the Json schema in JetBrains intellij IDEA,
follow [documented instructions](https://www.jetbrains.com/help/idea/json.html#ws_json_schema_add_custom),
with arguments such as:

* `schema url=https://goss.rocks/schemas/gossfile.yaml`
* `schema version=Json schema version 7`
* `file path pattern=*/goss.yaml`

## Available tests

* [addr](#addr)
* [command](#command)
* [dns](#dns)
* [file](#file)
* [gossfile](#gossfile)
* [group](#group)
* [http](#http)
* [interface](#interface)
* [kernel-param](#kernel-param)
* [matching](#matching)
* [mount](#mount)
* [package](#package)
* [port](#port)
* [process](#process)
* [service](#service)
* [user](#user)

### addr

Validates if a remote `address:port` are accessible.

```yaml
addr:
  tcp://ip-address-or-domain-name:80:
    # required attributes
    reachable: true
    # optional attributes
    # defaults to hash key
    address: "tcp://ip-address-or-domain-name:80"
    timeout: 500
    local-address: 127.0.0.1
```

### command

Validates the exit-status and output of a command.
This can be used in combination with the [gjson](#gjson) matcher to create powerful goss custom tests.

```yaml
command:
  'go version':
    # required attributes
    exit-status: 0
    # optional attributes
    # defaults to hash key
    exec: "go version"
    stdout:
    - go version go1.6 linux/amd64
    stderr: []
    timeout: 10000 # in milliseconds
    skip: false
```

`stdout` and `stderr` can be a string or [pattern](#patterns)

The `exec` attribute is the command to run; this defaults to the name of
the hash for backwards compatibility

### dns

Validates that the provided address is resolvable and the addrs it resolves to.

```yaml
dns:
  localhost:
    # required attributes
    resolvable: true
    # optional attributes
    # defaults to hash key
    resolve: localhost
    addrs:
    - 127.0.0.1
    - ::1
    server: 8.8.8.8 # Also supports server:port
    timeout: 500 # in milliseconds (Only used when server attribute is provided)
```

It is possible to validate the following types of DNS records, but requires the ```server``` attribute be set:

* `A`
* `AAAA`
* `CAA`
* `CNAME`
* `MX`
* `NS`
* `PTR`
* `SRV`
* `TXT`

To validate specific DNS address types, prepend the hostname with the type and a colon, a few examples:

```yaml
dns:
  # Validate a CNAME record
  CNAME:c.dnstest.io:
    resolvable: true
    server: 208.67.222.222
    addrs:
    - "a.dnstest.io."

  # Validate a PTR record
  PTR:8.8.8.8:
    resolvable: true
    server: 8.8.8.8
    addrs:
    - "dns.google."

  # Validate and SRV record
  SRV:_https._tcp.dnstest.io:
    resolvable: true
    server: 208.67.222.222
    addrs:
    - "0 5 443 a.dnstest.io."
    - "10 10 443 b.dnstest.io."
```

Please note that if you want `localhost` to **only** resolve `127.0.0.1` you'll need to use [Advanced Matchers](#advanced-matchers)

```yaml
dns:
  localhost:
    resolvable: true
    addrs:
      consist-of: [127.0.0.1]
    timeout: 500 # in milliseconds
```

### file

Validates the state of a file, directory, socket, or symbolic link

```yaml
file:
  /etc/passwd:
    # required attributes
    exists: true
    # optional attributes
    # defaults to hash key
    path: /etc/passwd
    mode: "0644"
    size: 2118 # in bytes
    owner: root
    group: root
    filetype: file # file, symlink, directory, socket
    contents: [] # Check file content for these patterns
    md5: 7c9bb14b3bf178e82c00c2a4398c93cd # md5 checksum of file
    # A stronger checksum alternatives to md5 (recommended)
    sha256: 7f78ce27859049f725936f7b52c6e25d774012947d915e7b394402cfceb70c4c
    sha512: cb71b1940dc879a3688bd502846bff6316dd537bbe917484964fe0f098e9245d80958258dc3bd6297bf42d5bd978cbe2c03d077d4ed45b2b1ed9cd831ceb1bd0
  /etc/alternatives/mta:
    # required attributes
    exists: true
    # optional attributes
    filetype: symlink # file, symlink, directory, socket
    linked-to: /usr/sbin/sendmail.sendmail
    skip: false
```

`contents` can be a string or a [pattern](#patterns)

### gossfile

Import other gossfiles from this one. This is the best way to maintain a large number of tests, and/or create profiles.
See [render](cli.md#render) for more examples. Glob patterns can be also be used to specify matching gossfiles.

```yaml
gossfile:
  myapplication:
    file: myapp_gossfile.yaml
    skip: false
  *.yaml:
    skip: true
  goss_httpd.yaml: {}
  /etc/goss.d/*.yaml: {}
```

You can specify the gossfile(s) either as the resource key, or using the 'file' attribute.

If the 'skip' attribute is true, then the file is not processed.
If the filename is a glob pattern, then none of the matching files are processed.
Note that this is not the same as skipping the contained resources;
any overrides in the referenced gossfile will not be processed, and the resource count will not be incremented.
Skipping a gossfile include is the same as omitting the gossfile resource entirely.

### group

Validates the state of a group

```yaml
group:
  nfsnobody:
    # required attributes
    exists: true
    # optional attributes
    # defaults to hash key
    groupname: /etc/passwd
    gid: 65534
    skip: false
```

### http

Validates HTTP response status code and content.

```yaml
http:
  https://www.google.com:
    # required attributes
    status: 200
    # optional attributes
    # defaults to hash key
    url: https://www.google.com
    allow-insecure: false
    no-follow-redirects: false # Setting this to true will NOT follow redirects
    timeout: 1000
    request-headers: # Set request header values
       - "Content-Type: text/html"
    headers: [] # Check http response headers for these patterns (e.g. "Content-Type: text/html")
    request-body: '{"key": "value"}' # request body
    body: [] # Check http response content for these patterns
    username: ""  # username for basic auth
    password: ""  # password for basic auth
    ca-file: ""   # CA root certs pem file, ex: /etc/ssl/cert.pem
    cert-file: "" # certificate file to use for authentication (used with key-file)
    key-file: ""  # private-key file to use for authentication (used with cert-file)
    proxy: "" # proxy server to proxy traffic through. Proxy can also be set with environment variables http_proxy.
    skip: false
    method: PUT # http method
```

!!! note
    only the first `Host` header will be used to set the `Request.Host` value if multiple are provided.

### interface

Validates network interface values

```yaml
interface:
  eth0:
    # required attributes
    exists: true
    # optional attributes
    # defaults to hash key
    name: eth0
    addrs:
    - 172.17.0.2/16
    - fe80::42:acff:fe11:2/64
    mtu: 1500
```

### kernel-param

Validates kernel param (sysctl) value.

```yaml
kernel-param:
  kernel.ostype:
    # required attributes
    value: Linux
    # optional attributes
    # defaults to hash key
    name: kernel.ostype
```

To see the full list of current values, run `sysctl -a`.

### mount

Validates mount point attributes.

```yaml
mount:
  /home:
    # required attributes
    exists: true
    # optional attributes
    # defaults to hash key
    timeout: 1000
    mountpoint: /home
    opts:
    - rw
    - relatime
    # This maps to the per-superblock options, see:
    # https://man7.org/linux/man-pages/man5/proc.5.html
    # https://man7.org/linux/man-pages/man2/mount.2.html
    vfs-opts:
    - rw
    source: /dev/mapper/fedora-home
    filesystem: xfs
    usage: #% of blocks used in this mountpoint
      lt: 95
```

### matching

Validates specified content against a matcher. Best used with [Templates](#templates).

#### With [Templates](#templates)

Let's say we have a `data.json` file that gets generated as part of some testing pipeline:

```json
{
  "instance_count": 14,
  "failures": 3,
  "status": "FAIL"
}
```

This could then be passed into goss: `goss --vars data.json validate`

And then validated against:

```yaml+jinja
matching:
  check_instance_count: # Make sure there is at least one instance
    content: {{ .Vars.instance_count }}
    matches:
      gt: 0

  check_failure_count_from_all_instance: # expect no failures
    content: {{ .Vars.failures }}
    matches: 0

  check_status:
    content: {{ .Vars.status }}
    matches:
      - not: FAIL
```

#### Without [Templates](#templates)

```yaml
matching:
  has_substr: # friendly test name
    content: some string
    matches:
      match-regexp: some str
  has_2:
    content:
      - 2
    matches:
      contain-element: 2
  has_foo_bar_and_baz:
    content:
      foo: bar
      baz: bing
    matches:
      and:
        - have-key: baz
```

### package

Validates the state of a package

```yaml
package:
  httpd:
    # required attributes
    installed: true
    # optional attributes
    # defaults to hash key
    name: httpd
    versions:
    - 2.2.15
    skip: false
```

!!! note
    this check uses the `--package <format>` parameter passed on the command line.

### port

Validates the state of a local port.

!!! note
    Goss might consider your port to be listening on `tcp6` rather than `tcp`,
    try running `goss add port ..` to see how goss detects it.
    ([explanation](https://github.com/goss-org/goss/issues/149))

```yaml
port:
  # {tcp,tcp6,udp,udp6}:port_num
  tcp:22:
    # required attributes
    listening: true
    # optional attributes
    # defaults to hash key
    port: 'tcp:22'
    ip: # what IP(s) is it listening on
    - 0.0.0.0
    skip: false
```

### process

Validates if a process is running.

```yaml
process:
  chrome:
    # required attributes
    running: true
    # optional attributes
    # defaults to hash key
    comm: chrome
    skip: false
```

!!! note
    This check is inspecting the name of the binary, not the name of the process.

    For example, a process with the name `nginx: master process /usr/sbin/nginx` would be checked with the process `nginx`.
    To discover the binary of a pid run `cat -E /proc/<PID>/comm`.

### service

Validates the state of a service.

```yaml
service:
  sshd:
    # Optional attributes
    # defaults to hash key
    name: sshd
    enabled: true
    running: true
    runlevels: ["3", "4", "5"]  # Alpine example, runlevels: ["default"]
    skip: false
```

`runlevels` is only supported on Alpine init, sysv init, and upstart

!!! note
    This will **not** automatically check if the process is alive, it will check the status from `systemd`/`upstart`/`init`.

### user

Validates the state of a user

```yaml
user:
  nfsnobody:
    # required attributes
    exists: true
    # optional attributes
    # defaults to hash key
    username: nfsnobody
    uid: 65534
    gid: 65534
    groups:
    - nfsnobody
    home: /var/lib/nfs
    shell: /sbin/nologin
    skip: false
```

!!! note
    This check is inspecting the contents of local passwd file `/etc/passwd`, this does not validate remote users (e.g. LDAP).

## Matchers

### Default Matchers

Default matchers are determined by the attribute value received from the system.

#### Bool, Strings, Integers

Bool, Strings and integers are compared using equality, for example:

```yaml
matching:
  basic_string:
    content: 'foo'
    matches: 'foo'

user:
  nfsnobody:
    exists: true
    uid: 65534
```

#### Arrays

Arrays are treated as a [contains-elements](#array-matchers) by default,
this validates that the expected test is a subset of the returned system state.

```yaml
matching:
  basic_array:
    content:
      - 'group1'
      - 'group2'
      - 'group3'
    matches:
      - 'group1'
      - 'group2'

  # This fails, since the returned result and it's no longer a subset
  basic_array_failing:
    content:
      - 'group1'
      - 'group2'
      - 'group3'
    matches:
      - 'group1'
      - 'group2'
      - 'group2' # this 2nd group2 is not in the returned content
```

#### io.Readers

This is the most magical matcher for goss. It remains a default for historic and performance reasons.
Some attributes return an io.Reader that is read line by line (ex. file content, command, http body).
This allows goss to validate large files/content efficiently.

Each pattern is checked against the attribute output, the type of patterns are:

* `"foo"` - checks if any line contains `foo`
* `"!foo"` - inverse of above, checks that no line contains `foo`
* `"\\!foo"` - escape sequence, check if any line contains `!string`
* `"/[Rr]egex/"` - verifies that line matches regex
* `"!/[Rr]egex/"` - inverse of above, checks that no line matches regex

!!! note
    Regex support is based on Golang's regex engine documented [here](https://golang.org/pkg/regexp/syntax/)

!!! warning
    You will **need** the double backslash (`\\`) escape for Regex special entities, for example `\\s` for blank spaces.

!!! example
    ```yaml
    file:
    /tmp/test.txt:
        exists: true
        contents:
        - "foo"
        - "!bar"
        - "/[Gg]oss/"
    ```

    The above can be expressed as:

    ```yaml
    file:
    /tmp/test.txt:
        exists: true
        contents:
        and:
            - contain-element: "foo"
            - not: {contain-element: "bar"}
            - contain-element: {match-regexp: "[Gg]oss"}

    ```

### Transforms

If the system state type and the expected type don't match,
goss will attempt to transform the system state type before matching it.

For example, kernel-param attribute returns a string, however, it can be tested using numeric comparisons:

!!! example "kernel-param test"
    ```yaml
    kernel-param:
    net.core.somaxconn:
        value: "128"
    ```

!!! example "(failing) kernel-param test with transform"
    ```yaml
    kernel-param:
    net.core.somaxconn:
        value: {gt: 200}
    ```

When a transformed test fails, it will detail the transformers used,
the `-o exclude_raw` option can be used to exclude the raw, untransformed attribute value:

```coonsole
$ goss v
F

Failures/Skipped:

KernelParam: net.core.somaxconn: value:
Expected
    128
to be >
    200
the transform chain was
    [{"to-numeric":{}}]
the raw value was
    "128"

Total Duration: 0.001s
Count: 1, Failed: 1, Skipped: 0

$ goss v -o exclude_raw
F

Failures/Skipped:

KernelParam: net.core.somaxconn: value:
Expected
    128
to be >
    200
the transform chain was
    [{"to-numeric":{}}]

Total Duration: 0.001s
Count: 1, Failed: 1, Skipped: 0

```

### Advanced Matchers

Goss supports advanced matchers by converting YAML input to [gomega](https://onsi.github.io/gomega/) matchers.

#### String Matchers

These will convert the system attribute to a string prior to matching.

* `'55'` - Checks that the numeric is "55" when converted to string
* `have-prefix: pre` - Checks if string starts with "pre"
* `have-suffix: suf` - Checks if string ends with "suf"
* `match-regexp: '.*'` - Checks if string matches regexp
* `contain-substring: '2'` - Checks if string contains "2"

* `'55'` - Checks that the numeric is "55" when converted to string
* `have-prefix: pre` - Checks if string starts with "pre"
* `have-suffix: suf` - Checks if string ends with "suf"
* `match-regexp: '.*'` - Checks if string matches regexp
* `contain-substring: '2'` - Checks if string contains "2"

!!! example
    ```yaml
    matching:
    example:
        content: 42
        matches:
        and:
            - '42'
            - have-prefix: '4'
            - have-suffix: '2'
            - match-regexp: '\d{2}'
            - contain-substring: '2'
    ```

#### Numeric matchers

These will convert the system attribute to a numeric prior to matching.

* `42` - If the expected type is a number
* `gt, ge, lt, le` - Greater than, greater than or equal, less than, etc..

!!! example
    ```yaml
    matching:
    example:
        content: "42"
        matches:
        and:
            - 42
            - 42.0
            - gt: 40
            - lt: 45
    ```

#### Array matchers

These will convert the system attribute to an array prior to matching. Strings are split on "\n"

* `contain-element: matcher` - Checks if the array contains an element that passes the matcher
* `contain-elements: [matcher, ...]` - checks if the array is a superset of the provided matchers
* `[matcher, ...]` - same as above
* `equal: [value, ...]` - Checks if the array is exactly equal to provided array
* `consist-of: [matcher, ...]` - Checks if the array consists of the provided matchers (order does not matter)

!!! example
    ```yaml
    matching:
    example:
        content: [foo, bar, moo]
        matches:
        and:
            - contain-elements: [foo, bar]
            - [foo, bar] # same as above
            - equal: [foo, bar, moo] # order matters, exact match
            - consist-of: [foo, have-prefix: m, bar] # order doesn't matter, can use matchers
            - contain-element:
                have-prefix: b
    ```

#### Misc matchers

These matchers don't really fall into any of the above categories, or span multiple categories.

* `equal` - Useful when needing to override a default matcher
* `have-len: 3` - Checks if the array/string/map has length of 3
* `have-key: "foo"` - Checks if key exists in map, useful with `gjson`
* `not: matcher` - Checks that a matcher does not match
* `and: [matcher, ..]` - Checks that all matchers match
* `or: [matcher, ..]` - Checks that any matchers match

!!! note
    When system returns a string it is converted into a one element array and matched

See the following for examples: [link..]fixme

##### semver-constraint

Checks that all versions match semver constraint or range syntax.
This uses [semver](https://github.com/blang/semver) under the hood, however, wildcards
(e.g. `1.X` are not officially supported and may go away in a future release).

!!! example
    ```yaml
    matching:
    semver:
        content:
        - 1.0.1
        - 1.9.9
        matches:
        semver-constraint: ">1.0.0 <2.0.0 !=1.5.0"
    semver2:
        content:
        - 1.0.1
        - 1.5.0
        - 1.9.9
        matches:
        not:
            semver-constraint: ">1.0.0 <2.0.0 !=1.5.0"
    semver3:
        content: 1.0.1
        matches:
        semver-constraint: ">5.0.0 || < 1.5.0"
    ```

##### gjson

Checks extracted [gjson](https://gjson.dev/) passes the matcher

Example:

```yaml
matching:
  example:
    content: '{"foo": "bar", "moo" {"nested": "cow"}, "count": "15"}'
    matches:
      gjson:
        moo.nested: cow
        foo: {have-prefix: b}
        count: {le: 25}
        '@this': {have-key: "foo"}
        moo:
          and:
            - {have-key: "nested"}
            - {not: {have-key: "nested2"}}
```

## Templates

Goss test files can leverage golang's [text/template](https://golang.org/pkg/text/template/)
to allow for dynamic or conditional tests.

Available variables:

* `{{.Env}}`  - Containing environment variables
* `{{.Vars}}` - Containing the values defined in [--vars](#global-options) file

Available functions:

* [built-in text/template functions](https://golang.org/pkg/text/template/#hdr-Functions)
* [Sprig functions](https://masterminds.github.io/sprig/)
* Custom functions:

    `mkSlice "ARG1" "ARG2"`
    :   Returns a slice of all the arguments. See examples below for usage.

    `getEnv "var" ["default"]`
    :   A more forgiving env var lookup. If key is missing either "" or default (if provided) is returned.

    `readFile "fileName"`
    :   Reads file content into a string, trims whitespace. Useful when a file contains a token.
        !!! note
            Goss will error out during the parsing phase if the file does not exist, no tests will be executed.

    `regexMatch "(some)?reg[eE]xp"`
    :   Tests the piped input against the regular expression argument.

    `toLower`
    :   Changes piped input to lowercase

    `toUpper`
    :   Changes piped input to UPPERCASE

    `findStringSubmatch regex string`
    :   Returns map[string]interface{} with the names of the parenthesized subexpressions, like `(?P<first>[a-z])`

        {{ $regexDBrc := "\\'mysql:\\/\\/(?P<login>[a-z0-9]+):(?P<password>[a-z0-9]+)@localhost\\/(?P<database>roundcube_[a-z0-9]+)\\';"}}

        {{ $rcConf := readFile /home/user/roundcube/config.inc.php | findStringSubmatch $regexDBrc }}
        {{ $UserDBrc := get $rcConf "login" }}
        {{ $PassDBrc  := get $rcConf "password" }}
        {{ $DBrc := get $rcConf "database" }}

    If not exists named parenthesized subexps, returns stringfied array string:

        {{ $regexDBrc := "\\'mysql:\\/\\/([a-z0-9]+):([a-z0-9]+)@localhost\\/(roundcube_[a-z0-9]+)\\';"}}

        {{ $rcConf := readFile /home/user/roundcube/config.inc.php | findStringSubmatch $regexDBrc }}
        {{ $UserDBrc := get $rcConf "1" }}
        {{ $PassDBrc  := get $rcConf "2" }}
        {{ $DBrc := get $rcConf "3" }}

    NOTE: stringfied string array begins with "1" ("0" is all the string matched)

!!! warning

    gossfiles containing text/template `{{}}` controls will no longer work with `goss add/autoadd`.
    One way to get around this is to split your template and static goss files and use [gossfile](#gossfile) to import.

!!! note

    Some of Sprig functions have the same name as the older Custom Goss functions.
    The Sprig functions are overwritten by the custom functions for backwards compatibility.

### Examples

Using [puppetlabs/facter](https://github.com/puppetlabs/facter) or [chef/ohai](https://github.com/chef/ohai)
as external tools to provide vars.

```bash
goss --vars <(ohai) validate
goss --vars <(facter -j) validate
```

Using `mkSlice` to define a loop locally.

```yaml+jinja
file:
{{- range mkSlice "/etc/passwd" "/etc/group"}}
  {{.}}:
    exists: true
    mode: "0644"
    owner: root
    group: root
    filetype: file
{{end}}
```

Using `upper` function from Sprig.

```yaml+jinja
matching:
  sping_basic:
    content: {{ "hello!" | upper | repeat 5 }}
    matches:
      match-regexp: "HELLO!HELLO!HELLO!HELLO!HELLO!"
```

Using Env variables and a vars file:

```yaml title="vars.yaml"
centos:
  packages:
    kernel:
      - "4.9.11-centos"
      - "4.9.11-centos2"
debian:
  packages:
    kernel:
      - "4.9.11-debian"
      - "4.9.11-debian2"
users:
  - user1
  - user2
```

```yaml+jinja title="goss.yaml"
package:
# Looping over a variables defined in a vars.yaml using $OS environment variable as a lookup key
{{range $name, $vers := index .Vars .Env.OS "packages"}}
  {{$name}}:
    installed: true
    versions:
    {{range $vers}}
      - {{.}}
    {{end}}
{{end}}

# This test is only when the OS environment variable matches the pattern
{{if .Env.OS | regexMatch "[Cc]ent(OS|os)"}}
  libselinux:
    installed: true
{{end}}

# Loop over users
user:
{{range .Vars.users}}
  {{.}}:
    exists: true
    groups:
    - {{.}}
    home: /home/{{.}}
    shell: /bin/bash
{{end}}


package:
{{if eq .Env.OS "centos"}}
  # This test is only when $OS environment variable is set to "centos"
  libselinux:
    installed: true
{{end}}
```

```console title="Rendered results"
# To validate:
$ OS=centos goss --vars vars.yaml validate
# To render:
$ OS=centos goss --vars vars.yaml render
# To render with debugging enabled:
$ OS=centos goss --vars vars.yaml render --debug
```
