rename variable; add docs

builder/oracle/oci/config.go

@@ -77,7 +77,7 @@ type Config struct {
 	InstanceTags        map[string]string                 `mapstructure:"instance_tags"`
 	InstanceDefinedTags map[string]map[string]interface{} `mapstructure:"instance_defined_tags"`
 	Shape               string                            `mapstructure:"shape"`
-	BootVolumeSizeInGBs int64                             `mapstructure:"boot_volume_size_in_gbs"`
+	BootVolumeSizeInGBs int64                             `mapstructure:"disk_size"`
 
 	// Metadata optionally contains custom metadata key/value pairs provided in the
 	// configuration. While this can be used to set metadata["user_data"] the explicit
@@ -333,7 +333,7 @@ func (c *Config) Prepare(raws ...interface{}) error {
 		c.BootVolumeSizeInGBs = 50
 	} else if c.BootVolumeSizeInGBs < 50 || c.BootVolumeSizeInGBs > 16384 {
 		errs = packer.MultiErrorAppend(
-			errs, errors.New("'boot_volume_size_in_gbs' must be between 50 and 16384 GBs"))
+			errs, errors.New("'disk_size' must be between 50 and 16384 GBs"))
 	}
 
 	if errs != nil && len(errs.Errors) > 0 {

builder/oracle/oci/config_test.go

@@ -44,8 +44,8 @@ func testConfig(accessConfFile *os.File) map[string]interface{} {
 		"create_vnic_details": map[string]interface{}{
 			"nsg_ids": []string{"ocd1..."},
 		},
-		"shape":                   "VM.Standard1.1",
-		"boot_volume_size_in_gbs": 60,
+		"shape":     "VM.Standard1.1",
+		"disk_size": 60,
 	}
 }
 

website/pages/docs/builders/oracle/oci.mdx

@@ -139,7 +139,7 @@ can also be supplied to override the typical auto-generated key:
 - `instance_name` (string) - The name to assign to the instance used for the image creation process.
   If not set a name of the form `instanceYYYYMMDDhhmmss` will be used.
 
-- `instance_tags` (map of strings) - Add one or more freeform tags to the instance used for the 
+- `instance_tags` (map of strings) - Add one or more freeform tags to the instance used for the
   image creation process.
 
 - `instance_defined_tags` (map of maps of strings) - Add one or more defined tags for a given namespace
@@ -153,6 +153,10 @@ can also be supplied to override the typical auto-generated key:
   [the Oracle docs](https://docs.cloud.oracle.com/en-us/iaas/Content/Network/Tasks/managingVNICs.htm)
   for more information about VNICs.
 
+- `disk_size` (int64) - The size of the boot volume in GBs. Minimum value is 50 and maximum value is 16384 (16TB).
+  Sets the [BootVolumeSizeInGBs](https://godoc.org/github.com/oracle/oci-go-sdk/core#InstanceConfigurationInstanceSourceViaImageDetails)
+  when launching the instance. Defaults to `50`.
+
 - `use_private_ip` (boolean) - Use private ip addresses to connect to the
   instance via ssh.