corrected hooks

README.md

@@ -1,6 +1,6 @@
 # How to boot a diskless VM with iPXE over NFS using only IPv6
 
-I have encoutered so many issues and countless hours trying to figure this out, but I finally succeeded. Reading source code, strace'ing binaries trying to figure out what was wrong with them.
+I have encountered so many issues and countless hours trying to figure this out, but I finally succeeded. Reading source code, strace'ing binaries trying to figure out what was wrong with them.
 
 # iPXE
 iPXE will do IPv4 DHCP first and then IPv6 SLAAC/DHCP. This is not a problem, it's just annoying. IPv4 DHCP has a default timeout in iPXE of 10 seconds.
@@ -14,16 +14,18 @@ What you need to do in iPXE:
 
 Make sure you pass the right kernel options for initramfs/initrd to know exactly what you want to do. (replace eth0 with the name of your PXE interface)
 * `ip=:::::eth0:off` (disable IPv4 on the PXE interface)
-* `ip6=:::::eth0:on` (enable IPv6 on the PXE interface)
+* `ip6=eth0` (enable IPv6 on the PXE interface)
 * `nfsroot=<hostname>:<path>` (mounting IPv6 NFS shares using a literal IPv6 **WILL FAIL**, you **MUST** use a hostname)
 
 Those options will tell the initrd script which interface and protocol is desired.
 
 # Hooks in initramfs
 
-A few files must be copied to the initramfs in order to make this work. First we need DNS to work and secondly we need to replace the busybox nfsmount with mount.nfs4 (don't worry, it can also do NFS3).
+NOTE: Be aware that this will increase the size of initrd. In my case it went to ~16MB which is still way less than on a physical host (~60MB).
 
-In /etc/initramfs-tools/hooks create an executable script with the name of your choice. Here's the content:
+A few files must be copied to the initramfs in order to make this work. First we need DNS to work and secondly we need to replace the busybox nfsmount with mount.nfs.
+
+In `/etc/initramfs-tools/hooks/` create an executable script with the name of your choice. Here's the content:
 
 ````
 #!/bin/bash
@@ -32,7 +34,7 @@ In /etc/initramfs-tools/hooks create an executable script with the name of your
 # copy all the name libraries (for DNS to work)
 cp -fpL /lib/x86_64-linux-gnu/libns* ${DESTDIR}/lib/x86_64-linux-gnu/
 
-# copy helper files needed by mount.nfs4
+# copy helper files needed by mount.nfs
 for file in /etc/protocols /etc/netconfig
 do cp $file ${DESTDIR}${file}; done
 
@@ -40,8 +42,29 @@ do cp $file ${DESTDIR}${file}; done
 # copy_exec /sbin/dhclient /sbin
 # copy_exec /bin/ping /bin
 # copy_exec /usr/bin/strace /bin
-# replace the busybox nfsmount with mount.nfs4 (this way we don't need to modify the included nfs script which calls nfsmount)
-copy_exec /sbin/mount.nfs4 /bin/nfsmount
+
+# replace the busybox nfsmount with mount.nfs (this way we don't need to modify the included nfs script which calls nfsmount)
+cp /sbin/mount.nfs ${DESTDIR}/bin/nfsmount
+
+# this little hack will find all libraries needed by mount.nfs, locate them and copy them.
+for lib in `ldd /sbin/mount.nfs | awk '{print $1}'`
+do
+    found=0
+    for path in /lib /lib/x86_64-linux-gnu /usr/lib /usr/lib/x86_64-linux-gnu
+    do
+        if [ -r "${path}/${lib}" ]
+        then
+            cp -L ${path}/${lib} ${DESTDIR}/${path}/${lib}
+            found=1
+        fi
+    done
+
+    if [ ! $found ]
+    then
+        echo "ERROR: Cannot find ${lib}"
+        exit 1;
+    fi
+done
 ````
 
 After that you'll need to `update-initramfs -u`