Add partition detection to fix osd initialization failure

The changes in the following commit did not completely solve the
problem of osd initialization failure:
https://review.opendev.org/652612

In order to solve this problem, the partprobe command consistent with
ceph-disk is added, and then a loop is added to detect the partition,
which is acquired every 1s. When the partition appears, the osd
initialization is continued.

Change-Id: I0ca255c6358132d9e3acfa6b610b70a78756512c
Closes-bug: #1824787

docker/ceph/ceph-osd/extend_start.sh

@@ -7,6 +7,32 @@ if [[ $(stat -c %a /var/log/kolla/ceph) != "755" ]]; then
     chmod 755 /var/log/kolla/ceph
 fi
 
+# Inform the os about partition table changes
+function partprobe_device {
+    local device=$1
+    udevadm settle --timeout=600
+    flock -s ${device} partprobe ${device}
+    udevadm settle --timeout=600
+}
+
+# In some cases, the disk partition will not appear immediately, so check every
+# 1s, try up to 10 times. In general, this interval is enough.
+function wait_partition_appear {
+    local dev_part=$1
+    local part_name=$(echo ${dev_part} | awk -F '/' '{print $NF}')
+    for(( i=1; i<11; i++ )); do
+        flag=$(ls /dev | awk '/'"${part_name}"'/{print $0}' | wc -l)
+        if [[ "${flag}" -eq 0 ]]; then
+            echo "sleep 1 waits for the partition ${dev_part} to appear: ${i}"
+            sleep 1
+        else
+            return 0
+        fi
+    done
+    echo "The device /dev/${dev_part} does not appear within the limited time 10s."
+    exit 1
+}
+
 # Bootstrap and exit if KOLLA_BOOTSTRAP variable is set. This catches all cases
 # of the KOLLA_BOOTSTRAP variable being set, including empty.
 if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
@@ -38,11 +64,13 @@ if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
                 sgdisk --zap-all -- "${OSD_BS_DEV}"
                 sgdisk --new=1:0:+100M --mbrtogpt -- "${OSD_BS_DEV}"
                 sgdisk --largest-new=2 --mbrtogpt -- "${OSD_BS_DEV}"
-                partprobe || true
+                partprobe_device "${OSD_BS_DEV}"
 
                 if [[ "${OSD_BS_DEV}" =~ "/dev/loop" ]]; then
+                    wait_partition_appear "${OSD_BS_DEV}"p2
                     sgdisk --zap-all -- "${OSD_BS_DEV}"p2
                 else
+                    wait_partition_appear "${OSD_BS_DEV}"2
                     sgdisk --zap-all -- "${OSD_BS_DEV}"2
                 fi
             fi