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Add option to keep old generations #55

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Merged
merged 1 commit into from
Jun 16, 2021
Merged

Add option to keep old generations #55

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7 changes: 7 additions & 0 deletions deploy_nixos/main.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,12 @@ variable "hermetic" {
default = false
}

variable "delete_older_than" {
type = string
description = "Can be a list of generation numbers, the special value old to delete all non-current generations, a value such as 30d to delete all generations older than the specified number of days (except for the generation that was active at that point in time), or a value such as +5 to keep the last 5 generations ignoring any newer than current, e.g., if 30 is the current generation +5 will delete generation 25 and all older generations."
default = "+1"
}

# --------------------------------------------------------------------------

locals {
Expand Down Expand Up @@ -184,6 +190,7 @@ resource "null_resource" "deploy_nixos" {
local.build_on_target,
local.ssh_private_key == "" ? "-" : local.ssh_private_key,
"switch",
var.delete_older_than,
],
local.extra_build_args
)
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8 changes: 6 additions & 2 deletions deploy_nixos/nixos-deploy.sh
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Expand Up @@ -33,7 +33,8 @@ targetPort="$4"
buildOnTarget="$5"
sshPrivateKey="$6"
action="$7"
shift 7
deleteOlderThan="$8"
shift 8

# remove the last argument
set -- "${@:1:$(($# - 1))}"
Expand Down Expand Up @@ -126,4 +127,7 @@ targetHostCmd "$outPath/bin/switch-to-configuration" "$action"

# Cleanup previous generations
log "collecting old nix derivations"
targetHostCmd "nix-collect-garbage" "-d"
# Deliberately not quoting $deleteOlderThan so the user can configure something like "1 2 3"
# to keep generations with those numbers
targetHostCmd "nix-env" "--profile" "$profile" "--delete-generations" $deleteOlderThan
targetHostCmd "nix-store" "--gc"