From 0ba253ef6926d2f8bf403f9b96ca9120d0022861 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 25 Mar 2017 13:22:03 +0200
Subject: Configure storage

---
 init | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 96 insertions(+), 7 deletions(-)

(limited to 'init')

diff --git a/init b/init
index a725372..80bab77 100755
--- a/init
+++ b/init
@@ -11,9 +11,23 @@ set -o errtrace # Trap in functions.
 # Note: diagnostics goes to stdout.
 #
 function info () { echo "$*"; }
-function error () { info "$*"; exit 1; }
+function error ()
+{
+  if [ "$#" -gt 0 ]; then
+    info "$*";
+  fi
 
-export PATH=/sbin:/usr/sbin:/bin:/usr/bin
+  # The setsid voodoo (take from Debian init's panic()) is to enable job
+  # control.
+  #
+  info "type Ctrl-D to exit shell and reboot"
+  setsid /bin/bash -c "exec /bin/bash -i <>/dev/tty1 1>&0 2>&1"
+  reboot
+}
+
+# Some pre-systemd utilities (like reboot) come from klibc-utils.
+#
+export PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/lib/klibc/bin/
 
 # One would expect rootflags=size=1g to work but it doesn't (perhaps init
 # is expected to interpret it)?
@@ -100,6 +114,7 @@ eth_all="$(cd /sys/class/net && ls -d en?*)"
 if [ -z "$eth_all" ]; then
   info "no ethernet interfaces found among:"
   ip link show
+  error
 fi
 
 eth=
@@ -152,13 +167,15 @@ for s in 1 2 4 8; do
 done
 
 if [ -z "$eth_up" ]; then
-  error "no ethernet interfaces with carrier among:"
+  info "no ethernet interfaces with carrier among:"
   ip link show
+  error
 fi
 
 if [ -z "$eth" ]; then
-  error "no ethernet interfaces with DHCP among:"
+  info "no ethernet interfaces with DHCP among:"
   ip link show
+  error
 fi
 
 mac="$(cat "/sys/class/net/$eth/address")"
@@ -182,7 +199,7 @@ info "hostname $hname"
 # based on what we have discovered and then let the systemd networking bringup
 # to configure everything (at which point we will hopefully reuse the lease).
 #
-dhclient -q -x
+dhclient -x 2>/dev/null
 
 # @@ Need to be make configurable.
 #
@@ -236,15 +253,85 @@ sed -r -i \
  -e "s%^(relayhost).*%\1 = $smtp_relay%" \
  /etc/postfix/main.cf
 
-# Make admin alias for buildos.admin_email, redirect root to admin.
+# Make admin alias for buildos.admin_email, alias root as admin.
 #
 cat <<EOF >>/etc/aliases
 admin: $admin_email
 root: admin
 EOF
-
 newaliases
 
+# Figure out disk configuration and generate the corresponding /etc/fstab.
+#
+fstab=/etc/fstab
+#fstab=/dev/stdout
+
+echo -n '' >$fstab
+
+l=
+machines=
+while read l || [ -n "$l" ]; do
+  d="$(sed -re 's/.*NAME=\"([^\"]+)\".*/\1/'   <<<"$l")"
+  t="$(sed -re 's/.*FSTYPE=\"([^\"]*)\".*/\1/' <<<"$l")"
+  l="$(sed -re 's/.*LABEL=\"([^\"]*)\".*/\1/'  <<<"$l")"
+
+  # Strip the buildos. prefix from the label. If the result is empty then
+  # this disk/patition hasn't been labeled for use by buildos.
+  #
+  l="$(sed -n -re 's/^buildos\.([^ ]+)$/\1/p' <<<"$l")"
+
+  if [ -z "$l" ]; then
+    continue
+  fi
+
+  # Handle buildos.machines and buildos.machines.* mounts.
+  #
+  if [[ "$l" == "machines" ]] || [[ "$l" =~ "machines.".+ ]]; then
+
+    if [ "$t" != "btrfs" ]; then
+      error "non-btrfs filesystem on $d labeled with buildos.machines"
+    fi
+
+    if [ "$l" = "machines" ]; then
+      # Single mount.
+      #
+      if [ -n "$machines" ]; then
+	error "multiple disks labeled with buildos.machines/machines.*"
+      fi
+
+      m=/build/machines
+      machines="single"
+    else
+      # Multiple mounts.
+      #
+      if [ "$machines" = "single" ]; then
+	error "multiple disks labeled with buildos.machines/machines.*"
+      fi
+
+      n="$(sed -n -re 's/^machines\.([^ ]+)$/\1/p' <<<"$l")"
+      m="/build/machines/$n"
+      machines="multiple"
+    fi
+
+    info "mounting $d (buildos.$l) on $m"
+
+    echo mkdir -p "$m"
+    o="defaults,noatime,nodiratime,user_subvol_rm_allowed"
+    echo "$d $m btrfs $o 0 0" >>$fstab
+  fi
+done < <(lsblk --pairs --paths --output NAME,FSTYPE,LABEL)
+#done <<EOF
+#NAME="/dev/sda" FSTYPE="btrfs" LABEL="buildos.machines.vol1"
+#NAME="/dev/sdb" FSTYPE="btrfs" LABEL="buildos.machines.vol2"
+#EOF
+
+if [ -z "$machines" ]; then
+  info "no disks labaled with buildos.machines* among:"
+  lsblk --paths --output NAME,TYPE,FSTYPE,SIZE,LABEL,UUID
+  info "consider formatting and/or labelling a suitable disk"
+  error
+fi
+
 /bin/bash
 
 # Hand off to systemd. But first arrange to keep console output (which
@@ -256,6 +343,8 @@ cat <<EOF >/etc/systemd/system/getty@tty1.service.d/noclear.conf
 TTYVTDisallocate=no
 EOF
 
+export PATH=/sbin:/usr/sbin:/bin:/usr/bin
+
 exec /lib/systemd/systemd \
   --show-status=1 \
   --machine-id="00000000000000000000$mid" \
-- 
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