runinstallvm: Add TEMPLATE option for self-contained install

Signed-off-by: Marc Zyngier <maz@kernel.org>

2 files changed, 7 insertions, 1 deletions

diff --git a/README b/README
index 3658dbb..3e55846 100644
--- a/README
+++ b/README
@@ -80,8 +80,11 @@ at some point. Maybe.
     generate a "runvm.sh" script in the same directory, which calls
     runefivm.sh with the right environment variables.
 
-* build-cd-image source.iso target.iso
+  - TEMPLATE: A disk image that is used to pre-populates the virtio
+    disk (useful for things like mini.iso that will pull everything
+    from the network).
 
+* build-cd-image source.iso target.iso
 
   - Debian/Ubuntu: Takes source.iso, adds preseed.cfg to it, add a new
     grub entry for unattended installation, repack the whole thing as
diff --git a/runinstallvm.sh b/runinstallvm.sh
index ea037db..5d6ea70 100755
--- a/runinstallvm.sh
+++ b/runinstallvm.sh
@@ -2,6 +2,7 @@
 
 OUT=${KEEPME-tmp}
 size=${SIZE-16G}
+template=${TEMPLATE-/dev/null}
 
 mkdir -p $OUT || exit 1
 
@@ -9,6 +10,8 @@ export DISK=$(mktemp --tmpdir=$OUT XXXXXXXXXXXXXXXX.img)
 export EFIVAR=$OUT/$(basename $DISK .img).fd
 
 truncate -s $size $DISK
+dd if=$template of=$DISK bs=1M conv=notrunc status=none
+
 truncate -s 64M $EFIVAR
 
 if [ ! -z "$KEEPME" ]; then