bsdinstall: Fix scripted examples

[jlduran]

Summary

Fix the manual page examples to account for pkgbase (the default).

While here, use the standard := parameter expansion operator to idiomatically
initialize DISTRIBUTIONS to an empty string.

Suggested by: asomers (manual page fix)
Suggested by: cperciva
MFC after: 1 week

Test Plan

1. fetch https://download.freebsd.org/releases/amd64/amd64/ISO-IMAGES/15.1/FreeBSD-15.1-RELEASE-amd64-dvd1.iso
2. mkdir release-media
3. tar -C release-media -xvf FreeBSD-15.1-RELEASE-amd64-dvd1.iso
4. Test each one of the examples. Note that for pkgbase examples, BSDINSTALL_PKG_REPOS_DIR=/usr/freebsd-packages/repos must be exported, otherwise the installation will attempt to get the pkgbase packages from FreeBSD.org, and fail. The location of the examples should be: release-media/etc/installerconfig.
5. sh /usr/src/release/amd64/mkisoimages.sh -b '15_1_RELEASE_AMD64_DVD' output.iso release-media

[cperciva]

Please commit and MFC ASAP. I'm holding RC3 for the loader issue but once that's sorted I'm going ahead and will not wait for this patch.

[jlduran]

OK, I will commit and MFC ASAP.
I also opted for removing the pkg install step, as it may fail on -CURRENT (see attached snapshot).

[jlduran]

• Remove pkg install

[asomers]

What's this about "removing the pkg install step"? I don't see anything removed.

[asomers]

Ahh, our comments crossed in the ether. But now that I see what you did, I request leaving "pkg install" in. IMHO it's a very important feature of the installerscript that it can install packages.

[jlduran]

In D57481#1316900, @asomers wrote:

What's this about "removing the pkg install step"? I don't see anything removed.

Please try refreshing. I removed the pkg install -y puppet step. On -CURRENT it fails with the attached screenshot. The example is already clear enough enabling SSH (IMO).

[jlduran]

In D57481#1316901, @asomers wrote:

Ahh, our comments crossed in the ether. But now that I see what you did, I request leaving "pkg install" in. IMHO it's a very important feature of the installerscript that it can install packages.

OK, In that case I must diagnose to see what is failing.

[asomers]

In D57481#1316903, @jlduran wrote:

In D57481#1316901, @asomers wrote:

Ahh, our comments crossed in the ether. But now that I see what you did, I request leaving "pkg install" in. IMHO it's a very important feature of the installerscript that it can install packages.

OK, In that case I must diagnose to see what is failing.

FWIW I don't like to rely on networking functioning in the autoinstaller, so I only install packages that are on the DVD image. I do it like this:

if [ -d /dist/packages ]; then
        cp /dist/packages/repos/FreeBSD_install_cdrom.conf /etc/pkg
        /usr/sbin/pkg bootstrap -r FreeBSD_install_cdrom -y
        /usr/sbin/pkg install -r FreeBSD_install_cdrom -y sysutils/py-salt net-mgmt/lldpd
        rm /etc/pkg/FreeBSD_install_cdrom.conf
fi

[jlduran]

In D57481#1316903, @jlduran wrote:

In D57481#1316901, @asomers wrote:

Ahh, our comments crossed in the ether. But now that I see what you did, I request leaving "pkg install" in. IMHO it's a very important feature of the installerscript that it can install packages.

OK, In that case I must diagnose to see what is failing.

I see now, the DVD I was using for testing only has the pkg package.

As an observation, there is nothing wrong with the previous commit. This one is mostly a man page fix.

[jlduran]

Update the manual page example mostly with @asomers' suggestion (a simpler version).
Note that the tmux package was chosen because it is known to be present on the DVD.

If a user wants to download packages straight from pkg.freebsd.org, when "Building Automatic Install Media", the /etc/rc.conf file must be modified to include ifconfig_DEFAULT="DHCP" (or any other method to get an IP address on the installation media, not on the chroot).

[jlduran]

Update COMPONENTS examples:

Add:

export BSDINSTALL_PKG_REPOS_DIR=/usr/freebsd-packages/repos

Which contains FreeBSD-base-offline.conf:

FreeBSD-base: {
  url: "file:///usr/freebsd-packages/offline",
  enabled: yes
}

Otherwise, it defaults to:

local repos_dir = os.getenv("BSDINSTALL_PKG_REPOS_DIR")
if not repos_dir then
	repos_dir = "/usr/share/bsdinstall/"

and that one has FreeBSD-base.conf:

FreeBSD-base: {
  url: "pkg+https://pkg.FreeBSD.org/${ABI}/base_latest",
  mirror_type: "srv",
  signature_type: "fingerprints",
  fingerprints: "/usr/share/keys/pkg",
  enabled: yes
}

Which will attempt to download from FreeBSD.org.

Update DISTRIBUTIONS example:

Showing how to configure DHCP on the scripted installer and download packages not present in the DVD.