On Sat, Sep 06, 2014 at 09:39:05AM -0700, Russ Allbery wrote: > Note also that a few of those things (udev, adduser, and > libdevmapper1.02.1 for example) are likely to be on any non-chroot system > already since they're either dependencies of other things (such as grub > for libdevmapper1.02.1) or are already in use regardless of the init > system (udev). So for the case of a small embedded system that's > nonetheless running the full kernel + bootloader stack, I suspect the > delta is even smaller.
I can give a hard data point. A month ago, debootstrap in Jessie was still giving you a sysvinit based system. I build a VM that has a minimal debootstrap, with a very small set of packages[1], plus xfstests. In early August, this VM was 54 megabytes [1] https://git.kernel.org/cgit/fs/ext2/xfstests-bld.git/tree/kvm-xfstests/test-appliance/packages This past weekend, I spent a good part of the weekend updating kvm-xfstests to use systemd, since debootstrap now forces systemd on you, and so I decided to bite the bullet and convert to systemd. This was not quite trivial, because I depended on being able to run xfstests in /etc/rc.local, and serial console getty would start up before /etc/rc.local had finished, and then HUP the entier xfstests run. Still, after fighting with the sysvinit unit scripts, I finally managed to get it all working again. The resulting VM image was 62 megabytes[2], or about 15% larger. Since the VM image generation is completely automated[3], I'm confident that this is an apples-to-apples comparison. [2] https://www.kernel.org/pub/linux/kernel/people/tytso/kvm-xfstests/ [3] https://git.kernel.org/cgit/fs/ext2/xfstests-bld.git/tree/kvm-xfstests/test-appliance/gen-image Cheers, - Ted P.S. Note what is required to be fully GPL compliant when distributing a VM image[4]. You need to be able to identify the precise sources for *all* of the GPL'ed packages used for a particular VM image, and it's something that most people don't bother to do. To (loosely) quote Bradley Kuhn from his recent talk at LinuxCon, "it's all too easy to accidentally violate the GPL; I'm sure I've done it from time to time". [4] ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/kvm-xfstests/README -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140908183223.ga6...@thunk.org
