Error when using `kraft pkg push`: `MANIFEST_BLOB_UNKNOWN`

[razvand]

Describe the bug

When using kraft pkg ... followed by kraft pkg push, the following error is generated:

 E  PUT https://index.unikraft.io/v2/razvan.unikraft.io/http-go-xyz/manifests/sha256:7324318ffad56fdb0e6148e38ca42e06710fb30e0a7e9fc13e0dfba608300b3a: MANIFEST_BLOB_UNKNOWN: blob unknown to 
 E  PUT https://index.unikraft.io/v2/razvan.unikraft.io/http-go-xyz/manifests/sha256:7324318ffad56fdb0e6148e38ca42e06710fb30e0a7e9fc13e0dfba608300b3a: MANIFEST_BLOB_UNKNOWN: blob unknown to registry; sha256:a21b88677c26c0af7c7e59045379eb7a5c0f425c3302a92e3eb2a61463c070a2

This only appears when using both commands:

kraft pkg ...
kraft pkg push ...

Everything works OK if only using:

kraft pkg --push ...

Steps to reproduce

No response

Expected behavior

Use pkg-push.zip. Follow the steps:

1. Unzip the file:

   unzip pkg-push.zip

2. Enter the pkg-push/ directory:

   cd pkg-push/

3. Configure the Unikraft Cloud variables:

   export UKC_TOKEN=...
   export UKC_METRO=fra0

4. Run the publish.sh script:

   ./publish.sh

KraftKit version

kraft 0.11.6 (caf53ee) go1.24.0 2025-04-01T08:10:57Z

Which architectures were you using or does this bug affect?

x86_64

Which operating system were you using or does this bug affect?

linux/debian

Relevant log output

[+] building rootfs via Dockerfile... done!                                                                                                                                      x86_64 [1.4s]
[+] packaging index.unikraft.io/razvan.unikraft.io/http-go-xyz... done!                                                                                               kraftcloud/x86_64 [0.0s]
<!> pushing                                                                                                                                                                       10 MB [6.2s]
 E  PUT https://index.unikraft.io/v2/razvan.unikraft.io/http-go-xyz/manifests/sha256:7324318ffad56fdb0e6148e38ca42e06710fb30e0a7e9fc13e0dfba608300b3a: MANIFEST_BLOB_UNKNOWN: blob unknown to 
 E  PUT https://index.unikraft.io/v2/razvan.unikraft.io/http-go-xyz/manifests/sha256:7324318ffad56fdb0e6148e38ca42e06710fb30e0a7e9fc13e0dfba608300b3a: MANIFEST_BLOB_UNKNOWN: blob unknown to registry; sha256:a21b88677c26c0af7c7e59045379eb7a5c0f425c3302a92e3eb2a61463c070a2

[craciunoiuc]

Can't reproduce the issue, will need more feedback and to investigate more

[razvand]

@craciunoiuc , I am able to replicate the issue with a different archive. Unpack the archive, make sure you have the UKC_TOKEN variable set and use:

./generate-suffix.sh
./pkg.sh
./push.sh

See if you are able to replicate the problem with this new archive.

Cc: @nderjung

[razvand]

The issue is fixed in the latest version of KraftKit staging (on Tuesday, September 16, 2025). I would still keep this issue open until the next stable release happens.