apt-mirror not syncing correctly

[Gustavo Sanchez]

===== Mirror Pov
After syncing multiple times there is one file that is always mirroring out of sync

Taking a look the official archive shows 13M (14090084) on the file http://archive.ubuntu.com/ubuntu/dists/jammy/universe/binary-amd64/Packages.xz

While my mirror is getting 9M
I deleted the file and mirrored again and still have a diff

===== Client Pov
Now from the client POV I will get the following error

$ apt update
Hit:1 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy-updates InRelease
Hit:2 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy-backports InRelease
Hit:3 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy-security InRelease
Get:4 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy InRelease [270 kB]
Get:5 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/main amd64 Packages [1395 kB]
Get:6 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/main Translation-en [510 kB]
Get:7 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/main amd64 c-n-f Metadata [30.3 kB]
Get:8 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/restricted amd64 Packages [129 kB]
Get:9 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/restricted Translation-en [18.6 kB]
Get:10 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/restricted amd64 c-n-f Metadata [488 B]
Get:11 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/universe amd64 Packages [14.1 MB]
Get:11 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/universe amd64 Packages [14.1 MB]
Get:11 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/universe amd64 Packages [14.1 MB]
Get:11 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/universe amd64 Packages [14.1 MB]
Get:11 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/universe amd64 Packages [14.1 MB]
Ign:11 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/universe amd64 Packages
Get:11 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/universe amd64 Packages [14.1 MB]
Err:11 http://ubuntu-archive.mirror.maas:8000/ubuntu jammy/universe amd64 Packages
  File has unexpected size (9596946 != 14090084). Mirror sync in progress? [IP: 10.10.11.63 8000]
  Hashes of expected file:
   - Filesize:14090084 [weak]
   - SHA256:d29cb24c93fec5f43255706bce7eb46d4779952039d8c68ac1bb14a6f3655ce2
   - SHA1:48f33706c3a3711801af4d1910f5e44722260458 [weak]
   - MD5Sum:b5650e6cdfe32048f4362e5c46bd0251 [weak]
  Release file created at: Thu, 21 Apr 2022 17:16:08 +0000
Fetched 270 kB in 1s (189 kB/s)
Reading package lists... Done
E: Failed to fetch http://ubuntu-archive.mirror.maas:8000/ubuntu/dists/jammy/universe/binary-amd64/Packages.xz File has unexpected size (9596946 != 14090084). Mirror sync in progress? [IP: 10.10.11.63 8000]
   Hashes of expected file:
    - Filesize:14090084 [weak]
    - SHA256:d29cb24c93fec5f43255706bce7eb46d4779952039d8c68ac1bb14a6f3655ce2
    - SHA1:48f33706c3a3711801af4d1910f5e44722260458 [weak]
    - MD5Sum:b5650e6cdfe32048f4362e5c46bd0251 [weak]
   Release file created at: Thu, 21 Apr 2022 17:16:08 +0000
E: Some index files failed to download. They have been ignored, or old ones used instead.

=== "Workaround"
Hacky workaround is to manually download the file
curl http://archive.ubuntu.com/ubuntu/dists/jammy/universe/binary-amd64/Packages.xz -o /var/spool/apt-mirror/mirror/archive.ubuntu.com/ubuntu/dists/jammy/universe/binary-amd64/Packages.xz

However,
1. I will have to manually download the file after each sync
2. I am worried this might happen later with other files

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[nE0sIghT (ne0sight)]

Hello!

I believe this issue can not be easily fixed in the apt-mirror because it currently doesn't enforce mirror data integrity.
You can try apt-mirror2 that enforces data integrity checks: https://gitlab.com/apt-mirror2/apt-mirror2