Enabe Automatic Garbage Collection

[laksith19]

removes old nix store files from generations older than 30 days every week. these numbers are kinda arbitrary

see oliver comment

[laksith19]

yea that was my stupidity but made it home and this builds without errors now

[laksith19]

just wanted to know if u guys had opinions on the frequency / amount of old generations we preserve. and if we need to preserve old generations on the host at all

[singingtelegram]

Actually I do, I think it’s probably better to keep a set number of past generations (eg. 5) than to remove all generations older than 30 days

…

On Tue, Feb 18, 2025 at 11:45 PM laksith19 ***@***.***> wrote: just wanted to know if u guys had opinions on the frequency / amount of old generations we preserve. and if we need to preserve old generations on the host at all — Reply to this email directly, view it on GitHub <#14 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABI35LVAMX5IUZO4OWBAIR32QQZCPAVCNFSM6AAAAABXNORU7CVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNRXG44TMMJWHA> . You are receiving this because your review was requested.Message ID: ***@***.***> [image: laksith19]*laksith19* left a comment (ocf/nix#14) <#14 (comment)> just wanted to know if u guys had opinions on the frequency / amount of old generations we preserve. and if we need to preserve old generations on the host at all — Reply to this email directly, view it on GitHub <#14 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABI35LVAMX5IUZO4OWBAIR32QQZCPAVCNFSM6AAAAABXNORU7CVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMNRXG44TMMJWHA> . You are receiving this because your review was requested.Message ID: ***@***.***>

[laksith19]

@singingtelegram yea i agree loll, that felt more "correct" but it's not as clean as keeping the prev 30 days but this should basically have the intended effect. the systemd service will delete old generations and the automatic garbage collector will just clean all un-referenced paths. tested on pumpkin and it seems to work.

Logs from pumpkin deleting profiles

root@pumpkin ~                                                                                                                
> systemctl status nix-remove-profiles.service            
○ nix-remove-profiles.service - Remove old NixOS generations but leave store cleanup to nix.gc
     Loaded: loaded (/etc/systemd/system/nix-remove-profiles.service; linked; preset: ignored)
     Active: inactive (dead) since Wed 2025-02-19 19:47:53 PST; 17min ago
 Invocation: d9317ce5d439405d8633c607dfffbf9d
TriggeredBy: ● nix-remove-profiles.timer
    Process: 85460 ExecStart=/nix/store/ipcqj7j75q1vr2fd1dfjk9yr4i2b2a48-unit-script-nix-remove-profiles-start/bin/nix-remove->
   Main PID: 85460 (code=exited, status=0/SUCCESS)
         IP: 0B in, 0B out
         IO: 312K read, 0B written
   Mem peak: 6.9M
        CPU: 72ms

Feb 19 19:47:53 pumpkin nix-remove-profiles-start[85473]: removing profile version 124
Feb 19 19:47:53 pumpkin nix-remove-profiles-start[85473]: removing profile version 125
Feb 19 19:47:53 pumpkin nix-remove-profiles-start[85473]: removing profile version 126
Feb 19 19:47:53 pumpkin nix-remove-profiles-start[85473]: removing profile version 127
Feb 19 19:47:53 pumpkin nix-remove-profiles-start[85473]: removing profile version 128
Feb 19 19:47:53 pumpkin nix-remove-profiles-start[85473]: removing profile version 129
Feb 19 19:47:53 pumpkin nix-remove-profiles-start[85473]: removing profile version 130
Feb 19 19:47:53 pumpkin nix-remove-profiles-start[85473]: removing profile version 131
Feb 19 19:47:53 pumpkin systemd[1]: nix-remove-profiles.service: Deactivated successfully.
Feb 19 19:47:53 pumpkin systemd[1]: Finished Remove old NixOS generations but leave store cleanup to nix.gc.

Logs from pumpkin garbage collecting nix store

root@pumpkin ~                                                                                                                
> systemctl status nix-gc.service
○ nix-gc.service - Nix Garbage Collector
     Loaded: loaded (/etc/systemd/system/nix-gc.service; linked; preset: ignored)
     Active: inactive (dead) since Wed 2025-02-19 20:00:23 PST; 4min 33s ago
 Invocation: 5c4492f8a8ea41afadb6f2367fa92628
TriggeredBy: ● nix-gc.timer
    Process: 85870 ExecStart=/nix/store/9w8gmhhkh2spbgj7nx9q701xra62ys59-unit-script-nix-gc-start/bin/nix-gc-start (code=exite>
   Main PID: 85870 (code=exited, status=0/SUCCESS)
         IP: 0B in, 0B out
         IO: 4.7G read, 6.3G written
   Mem peak: 5.1G
        CPU: 3min 40.776s

Feb 19 20:00:22 pumpkin nix-gc-start[85870]: deleting '/nix/store/yxksbqrq1dw7arrzmnqaqg8skrv2krch-hsqldb_1_8_0.zip.drv'
Feb 19 20:00:22 pumpkin nix-gc-start[85870]: deleting '/nix/store/mnjxbp0pv3qfill7aiwy71sinhdhvx1x-source.drv'
Feb 19 20:00:22 pumpkin nix-gc-start[85870]: deleting '/nix/store/4aqmxb68hldq1cnh6kj2ylzlqsi65vf5-lfs64.patch.drv'
Feb 19 20:00:22 pumpkin nix-gc-start[85870]: deleting '/nix/store/ys6kgil219cpfy8fhdgnz3rj22lrs3c8-crate-idna-0.3.0.tar.gz.drv'
Feb 19 20:00:22 pumpkin nix-gc-start[85870]: deleting unused links...
Feb 19 20:00:22 pumpkin nix-gc-start[85870]: note: currently hard linking saves -0.00 MiB
Feb 19 20:00:23 pumpkin nix-gc-start[85870]: 63418 store paths deleted, 87451.44 MiB freed
Feb 19 20:00:23 pumpkin systemd[1]: nix-gc.service: Deactivated successfully.
Feb 19 20:00:23 pumpkin systemd[1]: Finished Nix Garbage Collector.
Feb 19 20:00:23 pumpkin systemd[1]: nix-gc.service: Consumed 3min 40.776s CPU time, 5.1G memory peak, 4.7G read from disk, 6.3>