Add support for encrypted partition tables

Previously, it was assumed that the encrypted device contained a single
filesystem. Now we run a partprobe on decrypt to detect an existing
partition table inside the container. Behavior with devices that just
contain a single filesystem is unaffected.

This adds the partprobe binary to the initramfs.

2 files changed, 4 insertions, 1 deletions

diff --git a/init b/init
index 06abfc4..8ea174a 100755
--- a/init
+++ b/init
@@ -108,6 +108,9 @@ setup_encrypted() {
     read
   fi
 
+  # Probe the new crypto device for an additional partition table
+  partprobe "/dev/mapper/${name}" 2>/dev/null 1>/dev/null
+
   # Success. Return the path of the decrypted root device
   echo "/dev/mapper/${name}"
 }
diff --git a/mkinitramfs b/mkinitramfs
index 547d436..9ea6760 100755
--- a/mkinitramfs
+++ b/mkinitramfs
@@ -190,7 +190,7 @@ function main {
   # List of binaries to exist in the new initramfs
   resolve_bins \
     bash cat echo ls cryptsetup chmod chown mount sleep umount clear cut \
-    grep less tr which blkid reboot shutdown switch_root
+    grep less tr which blkid partprobe reboot shutdown switch_root
 
 
   # Set up the archive source dir.