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feat!: Swap count for for_each on subnet IAM resources #1009

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feat!: Swap count for for_each on subnet IAM resources #1009

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a3f2ef2
First stab at fixing subnet IAM permissions that change every time a …
thatcoleyouknow Oct 11, 2025
9033868
Almost forgot about the shared_vpc_access module
thatcoleyouknow Oct 11, 2025
197ca51
Improving diff readability
thatcoleyouknow Oct 11, 2025
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54 changes: 30 additions & 24 deletions modules/core_project_factory/main.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -212,20 +212,22 @@ resource "google_project_iam_member" "controlling_group_vpc_membership" {
*************************************************************************************/
resource "google_compute_subnetwork_iam_member" "service_account_role_to_vpc_subnets" {
provider = google-beta
count = var.grant_network_role && var.enable_shared_vpc_service_project && length(var.shared_vpc_subnets) > 0 && var.create_project_sa ? length(var.shared_vpc_subnets) : 0
for_each = (var.grant_network_role && var.enable_shared_vpc_service_project && length(var.shared_vpc_subnets) > 0 && var.create_project_sa) ? toset(var.shared_vpc_subnets) : toset([])

subnetwork = element(
split("/", var.shared_vpc_subnets[count.index]),
split("/", each.value),
index(
split("/", var.shared_vpc_subnets[count.index]),
"subnetworks",
) + 1,
split("/", each.value),
"subnetworks"
) + 1
)
role = "roles/compute.networkUser"

region = element(
split("/", var.shared_vpc_subnets[count.index]),
index(split("/", var.shared_vpc_subnets[count.index]), "regions") + 1,
split("/", each.value),
index(split("/", each.value), "regions") + 1
)

role = "roles/compute.networkUser"
project = var.shared_vpc
member = local.s_account_fmt
}
Expand All @@ -235,20 +237,22 @@ resource "google_compute_subnetwork_iam_member" "service_account_role_to_vpc_sub
*************************************************************************************/
resource "google_compute_subnetwork_iam_member" "group_role_to_vpc_subnets" {
provider = google-beta
for_each = (var.grant_network_role && var.enable_shared_vpc_service_project && length(var.shared_vpc_subnets) > 0 && var.manage_group) ? toset(var.shared_vpc_subnets) : toset([])

count = var.grant_network_role && var.enable_shared_vpc_service_project && length(var.shared_vpc_subnets) > 0 && var.manage_group ? length(var.shared_vpc_subnets) : 0
subnetwork = element(
split("/", var.shared_vpc_subnets[count.index]),
split("/", each.value),
index(
split("/", var.shared_vpc_subnets[count.index]),
"subnetworks",
) + 1,
split("/", each.value),
"subnetworks"
) + 1
)
role = "roles/compute.networkUser"

region = element(
split("/", var.shared_vpc_subnets[count.index]),
index(split("/", var.shared_vpc_subnets[count.index]), "regions") + 1,
split("/", each.value),
index(split("/", each.value), "regions") + 1
)

role = "roles/compute.networkUser"
member = local.group_id
project = var.shared_vpc
}
Expand All @@ -258,20 +262,22 @@ resource "google_compute_subnetwork_iam_member" "group_role_to_vpc_subnets" {
*************************************************************************************/
resource "google_compute_subnetwork_iam_member" "apis_service_account_role_to_vpc_subnets" {
provider = google-beta
for_each = (var.grant_network_role && var.enable_shared_vpc_service_project && length(var.shared_vpc_subnets) > 0) ? toset(var.shared_vpc_subnets) : toset([])

count = var.grant_network_role && var.enable_shared_vpc_service_project && length(var.shared_vpc_subnets) > 0 ? length(var.shared_vpc_subnets) : 0
subnetwork = element(
split("/", var.shared_vpc_subnets[count.index]),
split("/", each.value),
index(
split("/", var.shared_vpc_subnets[count.index]),
"subnetworks",
) + 1,
split("/", each.value),
"subnetworks"
) + 1
)
role = "roles/compute.networkUser"

region = element(
split("/", var.shared_vpc_subnets[count.index]),
index(split("/", var.shared_vpc_subnets[count.index]), "regions") + 1,
split("/", each.value),
index(split("/", each.value), "regions") + 1
)

role = "roles/compute.networkUser"
project = var.shared_vpc
member = local.api_s_account_fmt

Expand Down
40 changes: 23 additions & 17 deletions modules/shared_vpc_access/main.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -95,21 +95,24 @@ locals {
*****************************************/
resource "google_compute_subnetwork_iam_member" "service_shared_vpc_subnet_users" {
provider = google-beta
count = var.grant_network_role ? length(local.subnetwork_api) : 0
for_each = var.grant_network_role ? toset(local.subnetwork_api) : toset([])

subnetwork = element(
split("/", split(",", local.subnetwork_api[count.index])[1]),
split("/", each.value),
index(
split("/", split(",", local.subnetwork_api[count.index])[1]),
"subnetworks",
) + 1,
split("/", each.value),
"subnetworks"
) + 1
)
role = local.apis[split(",", local.subnetwork_api[count.index])[0]].role

region = element(
split("/", split(",", local.subnetwork_api[count.index])[1]),
index(split("/", split(",", local.subnetwork_api[count.index])[1]), "regions") + 1,
split("/", each.value),
index(split("/", each.value), "regions") + 1
)

role = local.apis[split(",", each.value)[0]].role
project = var.host_project_id
member = format("serviceAccount:%s", local.apis[split(",", local.subnetwork_api[count.index])[0]].service_account)
member = format("serviceAccount:%s", local.apis[split(",", each.value)[0]].service_account)
}

/******************************************
Expand All @@ -118,19 +121,22 @@ resource "google_compute_subnetwork_iam_member" "service_shared_vpc_subnet_users
*****************************************/
resource "google_compute_subnetwork_iam_member" "cloudservices_shared_vpc_subnet_users" {
provider = google-beta
count = local.gke_shared_vpc_enabled && var.enable_shared_vpc_service_project && var.grant_network_role ? length(local.subnetwork_api) : 0
for_each = local.gke_shared_vpc_enabled && var.enable_shared_vpc_service_project && var.grant_network_role ? toset(local.subnetwork_api) : toset([])

subnetwork = element(
split("/", split(",", local.subnetwork_api[count.index])[1]),
split("/", each.value),
index(
split("/", split(",", local.subnetwork_api[count.index])[1]),
"subnetworks",
) + 1,
split("/", each.value),
"subnetworks"
) + 1
)
role = "roles/compute.networkUser"

region = element(
split("/", split(",", local.subnetwork_api[count.index])[1]),
index(split("/", split(",", local.subnetwork_api[count.index])[1]), "regions") + 1,
split("/", each.value),
index(split("/", each.value), "regions") + 1
)

role = "roles/compute.networkUser"
project = var.host_project_id
member = format("serviceAccount:%[email protected]", local.service_project_number)
}
Expand Down