initramfs-framework/dmverity: add retry loop for slow boot devices

Detection of USB devices by the kernel is slow enough. We need to
keep trying for a while (default: 5s seconds, controlled by roottimeout=<seconds>)
and sleep between each attempt (default: one second, rootdelay=<seconds>).

Fix is based on https://git.yoctoproject.org/cgit.cgi/poky/commit/meta/recipes-core/initrdscripts/initramfs-framework/rootfs?id=ee6a6c3461694ce09789bf4d852cea2e22fc95e4

Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

1 files changed, 37 insertions, 27 deletions

diff --git a/recipes-core/initrdscripts/initramfs-framework/dmverity b/recipes-core/initrdscripts/initramfs-framework/dmverity
index bb07aab..888052c 100644
--- a/recipes-core/initrdscripts/initramfs-framework/dmverity
+++ b/recipes-core/initrdscripts/initramfs-framework/dmverity
@@ -10,33 +10,43 @@ dmverity_run() {
 
     . /usr/share/misc/dm-verity.env
 
-    case "${bootparam_root}" in
-        ID=*)
-            RDEV="$(realpath /dev/disk/by-id/${bootparam_root#ID=})"
-            ;;
-        LABEL=*)
-            RDEV="$(realpath /dev/disk/by-label/${bootparam_root#LABEL=})"
-            ;;
-        PARTLABEL=*)
-            RDEV="$(realpath /dev/disk/by-partlabel/${bootparam_root#PARTLABEL=})"
-            ;;
-        PARTUUID=*)
-            RDEV="$(realpath /dev/disk/by-partuuid/${bootparam_root#PARTUUID=})"
-            ;;
-        PATH=*)
-            RDEV="$(realpath /dev/disk/by-path/${bootparam_root#PATH=})"
-            ;;
-        UUID=*)
-            RDEV="$(realpath /dev/disk/by-uuid/${bootparam_root#UUID=})"
-            ;;
-        *)
-            RDEV="${bootparam_root}"
-    esac
-
-    if ! [ -b "${RDEV}" ]; then
-        echo "Root device resolution failed"
-        exit 1
-    fi
+    C=0
+    delay=${bootparam_rootdelay:-1}
+    timeout=${bootparam_roottimeout:-5}
+    RDEV="$(realpath /dev/disk/by-partuuid/${bootparam_root#PARTUUID=})"
+    while [ ! -b "${RDEV}" ]; do
+        if [ $(( $C * $delay )) -gt $timeout ]; then
+            fatal "Root device resolution failed"
+            exit 1
+        fi
+
+        case "${bootparam_root}" in
+            ID=*)
+                RDEV="$(realpath /dev/disk/by-id/${bootparam_root#ID=})"
+                ;;
+            LABEL=*)
+                RDEV="$(realpath /dev/disk/by-label/${bootparam_root#LABEL=})"
+                ;;
+            PARTLABEL=*)
+                RDEV="$(realpath /dev/disk/by-partlabel/${bootparam_root#PARTLABEL=})"
+                ;;
+            PARTUUID=*)
+                RDEV="$(realpath /dev/disk/by-partuuid/${bootparam_root#PARTUUID=})"
+                ;;
+            PATH=*)
+                RDEV="$(realpath /dev/disk/by-path/${bootparam_root#PATH=})"
+                ;;
+            UUID=*)
+                RDEV="$(realpath /dev/disk/by-uuid/${bootparam_root#UUID=})"
+                ;;
+            *)
+                RDEV="${bootparam_root}"
+        esac
+        debug "Sleeping for $delay second(s) to wait root to settle..."
+        sleep $delay
+        C=$(( $C + 1 ))
+
+    done
 
     veritysetup \
         --data-block-size=1024 \