partvi: create the dm map

2 files changed, 45 insertions, 1 deletions

diff --git a/partitions/part0.conf b/partitions/part0.conf
new file mode 100644
index 0000000..b81ea5b
--- /dev/null
+++ b/partitions/part0.conf
@@ -0,0 +1,4 @@
+name=ptable
+type=partition-table
+allocation=1M
+rebuild=always
diff --git a/src/partvi b/src/partvi
index 57a3dba..322b5ba 100755
--- a/src/partvi
+++ b/src/partvi
@@ -79,6 +79,7 @@ do
         case "$type" in
                 efi-system-partition|bios-grub|samizdat-*) ;;
                 dm-verity-hashes|dm-verity-data) require_var data_path ;;
+                partition-table) ;;
                 *) die "invalid type: $type" ;;
         esac
 
@@ -129,9 +130,48 @@ do
                                 cp -f -T --reflink "$data_path".verity "$builddir"/"$partuuid"
                                 ln -sfT "$partuuid" "$tmp"
                         ;;
-                        *) die "Unrecognized type: $type" ;;
                 esac
                 mv -T "$tmp" "$imgfile"
                 notice "Successfully wrote $imgfile"
         fi
 done
+
+if [ "$UID" = 0 ]
+then sudo=
+else sudo=sudo
+fi
+
+map_name=samline
+
+quietly()
+{
+        "$@" >/dev/null 2>&1 || true
+}
+
+quietly $sudo dmsetup remove "$map_name"
+quietly $sudo losetup -D
+
+start=0
+map=$builddir/dmsetup.map
+: > "$map"
+
+for f in part*.conf
+do
+        part=$builddir/${f%.conf}
+        if [ -h "$part" ]
+        then
+                partuuid=$(readlink -e "$part")
+        else
+                partuuid=
+        fi
+        #stat -L --format="$part %s" "$part"
+        $sudo losetup -L -f "$part"
+        dev=$(losetup -j "$part" -O NAME --noheadings)
+        devsz=$($sudo blockdev --getsz $dev)
+        printf '%d %d linear %s 0\n' $start $devsz "$dev" >> "$map"
+        start=$((start + devsz))
+
+done
+$sudo dmsetup -v create "$map_name" "$map"
+$sudo dmsetup remove "$map_name"
+