Question 180731 in Azure Question posted in
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Azure – How to omit a storage policy rule based on a condition in bicep?

I have this bicep code to apply two rules to a storage account policy on an Azure Storage Account:

@description('Name of the storage account')
param name string

@description('Number of days before moving from Hot to Cool storage')
param hotToCoolDays int

@description('Number of days to housekeep blob storage')
param houseKeepDays int

// the storage account to apply the policy to
resource stg 'Microsoft.Storage/storageAccounts@2021-08-01' existing = {
  name: name
}

resource sapolicy 'Microsoft.Storage/storageAccounts/managementPolicies@2021-02-01' = {
  name: '${name}/default'
  dependsOn: [
    stg
  ]
  properties: {
    policy: {
      rules: [ 
        {
          enabled: true
          name: 'hotToCoolAfter${hotToCoolDays}Days'
          type: 'Lifecycle'
          definition: {
            actions: {
              baseBlob: {
                tierToCool: {
                  daysAfterModificationGreaterThan: hotToCoolDays
                }
              }
            }
            filters: {
              blobTypes: [
                'blockBlob'
              ]
            }
          }
        }
        {
          enabled: true
          name: 'housekeepAfter${houseKeepDays}Days'
          type: 'Lifecycle'
          definition: {
            actions: {
              baseBlob: {
                delete: {
                  daysAfterModificationGreaterThan: houseKeepDays
                }
              }
            }
            filters: {
              blobTypes: [
                'blockBlob'
              ]
            }
          }
        }
      ]
    }
  }
}

I want to omit the rule if either variable hotToCoolDays or houseKeepDays is 0. I’ve tried using if statement and the ternary operator but can’t get either to work. Any ideas?

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I figured it out with

    @description('Number of days before moving from Cool to Cold storage')
param coolToColdDays int = 0

@description('Name of the storage account')
param name string

@description('Number of days before moving from Hot to Cool storage')
param hotToCoolDays int = 0

@description('Number of days to housekeep blob storage')
param houseKeepDays int = 0

var hotToCoolRule = [{
    name: 'hotToCoolRule'
    enabled: true
    type: 'Lifecycle'
    definition: {
      actions: {
        baseBlob: {
          tierToCool: {
            daysAfterModificationGreaterThan: hotToCoolDays
          }
        }
      }
      filters: {
        blobTypes: [
          'blockBlob'
        ]
      }
    }
  }]

  var coolToColdRule = [{
    name: 'coolToColdRule'
    enabled: true
    type: 'Lifecycle'
    definition: {
      actions: {
        baseBlob: {
          tierToCold: {
            daysAfterModificationGreaterThan: coolToColdDays
          }
        }
      }
      filters: {
        blobTypes: [
          'blockBlob'
        ]
      }
    }
  }]

var houseKeepRule = [{
    name: 'housekeepRule'
    enabled: true
    type: 'Lifecycle'
    definition: {
      actions: {
        baseBlob: {
          delete: {
            daysAfterModificationGreaterThan: houseKeepDays
          }
        }
      }
      filters: {
        blobTypes: [
          'blockBlob'
        ]
      }
    }
  }]

var rules = concat(
  (hotToCoolDays > 0) ? hotToCoolRule : [],
  // (coolToColdDays > 0) ? coolToColdRule : [], this line is commented out as it's not available yet (PREVIEW)
  (houseKeepDays > 0) ? houseKeepRule : []
)

resource stg 'Microsoft.Storage/storageAccounts@2021-08-01' existing = {
  name: name
}

resource sapolicy 'Microsoft.Storage/storageAccounts/managementPolicies@2022-09-01' = if (! empty(rules)) {
  name: 'default'
  parent: stg
  properties: {
    policy: {
      rules: rules
    }
  }
}

  2. 0

    You can check the documentation: Conditional deployment in Bicep.

    For you it should look like that:

    resource sapolicy 'Microsoft.Storage/storageAccounts/managementPolicies@2021-02-01' = if (!(hotToCoolDays == 0 || houseKeepDays == 0)) {
  ...
}
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