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Bug#855030: debian-installer-9-netboot-amd64: d-i does not copy kernel command line arguments after "---" to the bootloader

Package: debian-installer-9-netboot-amd64
Version: 20170127
Severity: important

Dear Maintainer,

We are using d-i with preseeding to automatically provision virtual 
machines. While testing the Stretch installer, I found out that 
(contrary to Jessie's installer and the documentation), it does not copy 
the "net.ifnames=0" argument from the kernel command line to grub's 
command line, even though I specify it after "---".

Steps to reproduce:

1. Create an empty qemu disk image (/tmp/stretch.img)
2. Boot the installer using kvm:
 kvm -m 512 -kernel /usr/lib/debian-installer/images/9/amd64/text/debian-installer/amd64/linux  \
 -initrd /usr/lib/debian-installer/images/9/amd64/text/debian-installer/amd64/initrd.gz  \
 -append "url=URL_TO_SIMPLE_PRESEED_FILE country=GR locale=en_US language=en interface=eth0 keymap=us priority=critical --- net.ifnames=0" \
 -drive format=qcow2,if=virtio,file=/tmp/stretch.img,cache=unsafe  \
 -netdev user,id=user0 -device virtio-net-pci,netdev=user0 -no-reboot
3. After installation, the virtual machine will boot up without 
net.ifnames=0 and the primary network interface will be called ens3.

The workaround in this case is to preseed 
debian-installer/add-kernel-opts with the extra kernel command 


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