** Description changed:
[SRU Justification]
initramfsless boot is an important enhancement to decrease boot times and
increase density for cloud images. Unfortunately, live-build assumes that an
initramfs is used, and image builds fail if it is not present. Fix this so
that these improvements can be applied to the LTS, which represents the vast
majority of cloud instances.
[Test case]
1. Build livecd-rootfs from
lp:~rbalint/livecd-rootfs/minimize-unminimize-xenial
2. Install this version of livecd-rootfs with the xenial-updates live-build.
3. Create a build directory with 'mkdir build-dir; cd build-dir'
4. Attempt an image build with the command (as root): 'cp -a
/usr/share/livecd-rootfs/live-build/{auto,ubuntu-cpc}/ .; env
PROJECT=ubuntu-cpc SUBPROJECT=minimize ARCH=amd64 SUITE=xenial lb config && env
PROJECT=ubuntu-cpc SUBPROJECT=minimize ARCH=amd64 lb build'
4. Confirm that this fails to produce output, with the error 'cp: cannot stat
'chroot/boot/initrd.img-*': No such file or directory'
5. Clean up the build tree with 'rm -r --one-file-system .build/ *'
6. Install live-build from xenial-proposed.
7. Attempt a second image build with the same command from step 4.
8. Confirm that this produces output files in the current directory.
+ [Regression potential]
+ If another bug is introduced elsewhere that causes an initramfs to fail to be
generated in the expected location as part of an image that does require one,
the resulting image build will fail or will fail to boot due to the ignored
error.
[Original description]
Lb may fail when creating an image with a kernel not requiring, hence
initramfs-tools not building initrd.
...
P: Begin installing local package lists...
[2017-09-28 15:55:06] lb_binary_linux-image
P: Begin install linux-image...
cp: cannot stat 'chroot/boot/initrd.img-*': No such file or directory
P: Begin unmounting filesystems...
P: Saving caches...
Reading package lists...
Building dependency tree...
...
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https://bugs.launchpad.net/bugs/1720217
Title:
Allow building images with kernels without initrd
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