[Build]: Fix /proc not mounted issue (#10164)

[Build]: Fix /proc not mounted issue

Author: xumia

build_debian.sh

@@ -67,6 +67,9 @@ mkdir -p $FILESYSTEM_ROOT/$PLATFORM_DIR
 mkdir -p $FILESYSTEM_ROOT/$PLATFORM_DIR/x86_64-grub
 touch $FILESYSTEM_ROOT/$PLATFORM_DIR/firsttime
 
+## ensure proc is mounted
+sudo mount proc /proc -t proc || true
+
 ## make / as a mountpoint in chroot env, needed by dockerd
 pushd $FILESYSTEM_ROOT
 sudo mount --bind . .

files/build_templates/sonic_debian_extension.j2

@@ -648,10 +648,7 @@ if [ $MULTIARCH_QEMU_ENVIRON == y ]; then
 fi
 
 {% if installer_images.strip() -%}
-clean_proc() {
-    sudo umount /proc || true
-}
-trap_push clean_proc
+## ensure proc is mounted
 sudo mount proc /proc -t proc || true
 sudo mkdir $FILESYSTEM_ROOT/target
 sudo mount --bind target $FILESYSTEM_ROOT/target
@@ -732,7 +729,6 @@ if [ $MULTIARCH_QEMU_ENVIRON == y ]; then
 else
     sudo chroot $FILESYSTEM_ROOT $DOCKER_CTL_SCRIPT stop
 fi
-sudo umount /proc || true
 
 sudo bash -c "echo { > $FILESYSTEM_ROOT_USR_SHARE_SONIC_TEMPLATES/ctr_image_names.json"
 {% for entry in feature_vs_image_names.split(' ') -%}