Issue: postinst.chroot not found (building in docker container)

[PVNagel]

Hello everyone, I'm having an issue with my mkosi.postinst.chroot in the build process, and hoping someone have some solid ideas.

What im doing is automating the build process of an OS image, so im using a runner to do this in a container (with --privileged flag)

Overview:
Level 1 (Host): Windows/WSL.
Level 2 (Container): Fedora 42 container where /work is mounted.
Level 3 (Chroot): The temporary image root mkosi creates to run the script.

In mkosi.conf:
[Validation]
SecureBoot=yes
SecureBootKey=resources/pki/db.key
SecureBootCertificate=resources/pki/db.crt

[Content]
Bootable=yes
Bootloader=systemd-boot
UnifiedKernelImages=yes
PostInstallationScripts=mkosi.postinst.chroot

Here you can see the actual structure of the file hierarchy

But! when I build I get this error:
‣ Running depmod for 6.18.7-100.fc42.x86_64
‣ Copying in extra file trees…
‣ Running postinstall script /work/fedora/laptop/v1/mkosi.postinst.chroot…
‣ /work/postinst not found.

Feel like I've tried alot of different things and even tried to vibe code the hell out of it. But with no success.

[daandemeyer]

Do you have the interpreter for your postinst script installed in the container?

[PVNagel]

Finally found a fix for it (classic, right after asking for help!):
dnf install -y dos2unix
dos2unix mkosi.postinst.chroot

so from what I understand
the interpreter was there, but the script had CRLF line endings from Windows, so the kernel was looking for 'sh\r' instead of 'sh'. Running dos2unix fixed the path resolution.

Thank you for your time.