Merge ~mwhudson/casper:interactive-network-conf into casper:master

[Michael Hudson-Doyle]

This is https://code.launchpad.net/~xnox/ubuntu/+source/casper/+git/casper/+merge/383189 proposed against the new lp:casper repo.

[Michael Hudson-Doyle (mwhudson)]

So I tested this and found some immediate problems:

1) It takes an age to appear.
2) It needs one more : for ipconfig apparently, but it would be better to mimic ip=dhcp in the dhcp case.
3) our busybox wget does not support https.

[Michael Hudson-Doyle (mwhudson)]

Made some improvements, still doesn't work though for reasons I haven't attempted to determine.

[Michael Hudson-Doyle (mwhudson)]

Oh it was just the uuid stuff stopping it working.

[Dimitri John Ledkov (xnox)]

So, we can use DPKG_ARCH variable for the architecture tag

And we can use etc/os-release for dynamically detecting the right version number & development series.

diff --git a/debian/changelog b/debian/changelog
index 7946eec..a7a0160 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+casper (1.447) UNRELEASED; urgency=medium
+
+  * Add interactive network configuration.
+
+ -- Michael Hudson-Doyle <[e-mail]>  Wed, 06 May 2020 19:51:18 +1200
+
 casper (1.446) groovy; urgency=medium
 
   * control: add fdisk dependency
diff --git a/scripts/casper b/scripts/casper
index eafcde4..f09d874 100644
--- a/scripts/casper
+++ b/scripts/casper
@@ -298,6 +298,114 @@ do_cifsmount() {
     return ${rc}
 }
 
+do_interactive_netmount() {
+    rc=1
+    if [ -x /bin/plymouth ] && plymouth --ping; then
+        plymouth hide-splash
+        sleep 1
+    fi
+    echo "Unable to find a medium container a live file system"
+    echo "Attempt interactive netboot from a URL?"
+    read -p "yes no (default yes): " RET
+    if [ "$RET" = "no" ]; then
+        return ${rc}
+    fi
+
+    # zdev
+    if type lszdev 2>/dev/null 1>/dev/null; then
+        echo "Available qeth devices:"
+        # shellcheck disable=SC2005 disable=SC2046
+        echo $(lszdev qeth --offline --columns id --no-headings | sed 's/:.*//') | fold -s -w 79
+        read -p "zdev to activate (comma separated, optional): " zdev
+        if [ -n "$zdev" ]; then
+            chzdev -e $zdev
+        fi
+    fi
+
+    # dhcp vs static
+    echo "Two methods available for IP configuration:"
+    echo "  * static: for static IP configuration"
+    echo "  * dhcp: for automatic IP configuration"
+    read -p "static dhcp (default 'dhcp'): " proto
+    # Yet support all the things linux kernel does
+    case $proto in
+        static|off|none)
+            proto=none
+            read -p "ip: " ipaddr
+            read -p "gateway: " gateway
+            read -p "dns: " dns
+            ;;
+        dhcp|on|any|"")
+            export IP=dhcp ;;
+        *)
+            echo invalid option ;;
+    esac
+
+    # vlan
+    read -p "vlan id (optional): " vlanid
+
+    # pick interface
+    interfaces=$(ls /sys/class/net | grep -v lo)
+    count=$(echo $interfaces | wc -w)
+    default_device=$(echo ${interfaces} | cut -d " " -f1)
+    if [ "$count" -gt 1 ]; then
+        if [ -n "$vlanid" ] || [ "$proto" = "none" ]; then
+            echo "Available interfaces:"
+            echo $interfaces | fold -s -w 79
+            read -p "device (default $default_device): " DEVICE
+            if [ -z "$DEVICE" ]; then
+                DEVICE=$default_device
+            fi
+        fi
+    fi
+
+    if [ "$proto" = "none" ]; then
+       export IP=:$ipaddr:$gateway:::$DEVICE:$proto:$dns
+    fi
+
+    # url & proxy
+    echo "Please specify URL to the .iso Examples:"
+    machine=$(uname -m)
+    case $machine in
+        x86_64) machine="amd64" ;;
+        ppc64le) machine="ppc64el" ;;
+        aarch64) machine="arm64" ;;
+    esac
+    case $machine in
+        amd64)
+            default_url=http://releases.ubuntu.com/focal/ubuntu-20.04-live-server-$machine.iso
+            echo " $default_url (default)"
+            echo " http://releases.ubuntu.com/focal/ubuntu-20.04-desktop-$machine.iso"
+            ;;
+        *)
+            default_url=http://cdimage.ubuntu.com/releases/focal/release/ubuntu-20.04-live-server-$machine.iso
+            echo " $default_url (default)"
+            ;;
+    esac
+    read -p "url: " url
+    if [ -z "$url" ]; then
+        url=$default_url
+    fi
+    read -p "http_proxy (optional): " http_proxy
+    if [ -n "$http_proxy" ]; then
+        export http_proxy=$http_proxy
+    fi
+
+    if [ -n "$vlanid" ]; then
+        export VLAN=$DEVICE.$vlanid:$DEVICE
+        DEVICE=$DEVICE.$vlanid
+        export VLAN=$vlan
+    fi
+
+    echo Configuring networking...
+
+    configure_networking
+
+    export NETBOOT=url
+    export URL=$url
+    do_netmount
+}
+
 do_snap_copy ()
 {
     fromdev="${1}"
@@ -768,6 +876,12 @@ mountroot() {
             sleep 1
             i="$(($i + 1))"
         done
+
+        if [ -z "${livefs_root}" ]; then
+            if do_interactive_netmount ; then
+                livefs_root="${mountpoint}"
+            fi
+        fi
     fi
 
     if [ -z "${livefs_root}" ]; then