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0b1c5628c7
The vm_extra_pre_umount function in vmimage.subr served two purposes: It removed /etc/resolv.conf and /qemu (if cross-building), and it provided a function for cloudware to override in order to make cloud specific changes to the filesystem before constructing a disk image. This resulted in a number of bugs: 1. When cross-building, the emulator binary was left as /qemu in the Azure, GCE, Openstack and Vagrant images. 2. The build host's resolv.conf was left as /etc/resolv.conf in the basic-ci and basic-cloudinit images. 3. When building GCE images, a Google-specific resolv.conf file was constructed, and then deleted before the disk image was created. Move the bits needed for running code inside a VM staging directory from vm_install_base into a new vm_emulation_setup routine, and move the corresponding cleanup bits from vm_extra_pre_umount to a new vm_emulation_cleanup routine. Remove the /qemu and /etc/resolv.conf cleanups from the cloudware configuration files (where they exist) since we will now be running vm_emulation_cleanup to remove those even when vm_extra_pre_umount has been overridden. Override vm_emulation_cleanup in gce.conf since in that one case (and *only* that one case) we don't want to clean up resolv.conf (since it was constructed for the VM image rather than copied from the host). releng/14.1 candidate. MFC after: 1 week Sponsored by: https://www.patreon.com/cperciva
107 lines
4.1 KiB
Bash
107 lines
4.1 KiB
Bash
#!/bin/sh
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# Packages which should be installed onto all EC2 AMIs:
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# * ebsnvme-id, which is very minimal and provides important EBS-specific
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# functionality,
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# * amazon-ssm-agent (not enabled by default, but some users need to use
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# it on systems not connected to the internet).
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export VM_EXTRA_PACKAGES="${VM_EXTRA_PACKAGES} ebsnvme-id amazon-ssm-agent"
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# Services which should be enabled by default in rc.conf(5).
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export VM_RC_LIST="dev_aws_disk ntpd"
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# Build with a 5.9 GB partition; the growfs rc.d script will expand
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# the partition to fill the root disk after the EC2 instance is launched.
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# Note that if this is set to <N>G, we will end up with an <N+1> GB disk
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# image since VMSIZE is the size of the filesystem partition, not the disk
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# which it resides within.
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export VMSIZE=6000m
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# No swap space; it doesn't make sense to provision any as part of the disk
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# image when we could be launching onto a system with anywhere between 0.5
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# and 4096 GB of RAM.
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export NOSWAP=YES
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ec2_common() {
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# Delete the pkg package and the repo database; they will likely be
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# long out of date before the EC2 instance is launched.
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mount -t devfs devfs ${DESTDIR}/dev
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chroot ${DESTDIR} ${EMULATOR} env ASSUME_ALWAYS_YES=yes \
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/usr/sbin/pkg delete -f -y pkg
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umount ${DESTDIR}/dev
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rm ${DESTDIR}/var/db/pkg/repo-*.sqlite
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# Turn off IPv6 Duplicate Address Detection; the EC2 networking
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# configuration makes it unnecessary.
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echo 'net.inet6.ip6.dad_count=0' >> ${DESTDIR}/etc/sysctl.conf
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# Booting quickly is more important than giving users a chance to
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# access the boot loader via the serial port.
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echo 'autoboot_delay="-1"' >> ${DESTDIR}/boot/loader.conf
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echo 'beastie_disable="YES"' >> ${DESTDIR}/boot/loader.conf
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# Tell gptboot not to wait 3 seconds for a keypress which will
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# never arrive.
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printf -- "-n\n" > ${DESTDIR}/boot.config
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# The emulated keyboard attached to EC2 instances is inaccessible to
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# users, and there is no mouse attached at all; disable to keyboard
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# and the keyboard controller (to which the mouse would attach, if
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# one existed) in order to save time in device probing.
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echo 'hint.atkbd.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
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echo 'hint.atkbdc.0.disabled=1' >> ${DESTDIR}/boot/loader.conf
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# EC2 has two consoles: An emulated serial port ("system log"),
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# which has been present since 2006; and a VGA console ("instance
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# screenshot") which was introduced in 2016.
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echo 'boot_multicons="YES"' >> ${DESTDIR}/boot/loader.conf
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# Some older EC2 hardware used a version of Xen with a bug in its
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# emulated serial port. It is not clear if EC2 still has any such
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# nodes, but apply the workaround just in case.
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echo 'hw.broken_txfifo="1"' >> ${DESTDIR}/boot/loader.conf
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# Load the kernel module for the Amazon "Elastic Network Adapter"
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echo 'if_ena_load="YES"' >> ${DESTDIR}/boot/loader.conf
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# Use the "nda" driver for accessing NVMe disks rather than the
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# historical "nvd" driver.
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echo 'hw.nvme.use_nvd="0"' >> ${DESTDIR}/boot/loader.conf
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# Disable KbdInteractiveAuthentication according to EC2 requirements.
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sed -i '' -e \
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's/^#KbdInteractiveAuthentication yes/KbdInteractiveAuthentication no/' \
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${DESTDIR}/etc/ssh/sshd_config
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# Use FreeBSD Update mirrors hosted in AWS
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sed -i '' -e 's/update.FreeBSD.org/aws.update.FreeBSD.org/' \
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${DESTDIR}/etc/freebsd-update.conf
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# Use the NTP service provided by Amazon
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sed -i '' -e 's/^pool/#pool/' \
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-e '1,/^#server/s/^#server.*/server 169.254.169.123 iburst/' \
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${DESTDIR}/etc/ntp.conf
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# Provide a map for accessing Elastic File System mounts
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cat > ${DESTDIR}/etc/autofs/special_efs <<'EOF'
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#!/bin/sh
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if [ $# -eq 0 ]; then
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# No way to know which EFS filesystems exist and are
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# accessible to this EC2 instance.
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exit 0
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fi
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# Provide instructions on how to mount the requested filesystem.
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FS=$1
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REGION=`fetch -qo- http://169.254.169.254/latest/meta-data/placement/availability-zone | sed -e 's/[a-z]$//'`
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echo "-nfsv4,minorversion=1,oneopenown ${FS}.efs.${REGION}.amazonaws.com:/"
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EOF
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chmod 755 ${DESTDIR}/etc/autofs/special_efs
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# The first time the AMI boots, run "first boot" scripts.
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touch ${DESTDIR}/firstboot
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return 0
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}
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