Fix shell check

https://github.com/koalaman/shellcheck/wiki/SC2068
https://github.com/koalaman/shellcheck/wiki/SC2086
https://github.com/koalaman/shellcheck/wiki/SC2164
Signed-off-by: clarklee92 <[email protected]>

Author: clarklee92

cluster/gce/config-default.sh

@@ -16,7 +16,7 @@
 
 # TODO(jbeda): Provide a way to override project
 # gcloud multiplexing for shared GCE/GKE tests.
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/../..
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/../..
 source "${KUBE_ROOT}/cluster/gce/config-common.sh"
 
 # Specifying KUBE_GCE_API_ENDPOINT will override the default GCE Compute API endpoint (https://www.googleapis.com/compute/v1/).

cluster/gce/config-test.sh

@@ -16,7 +16,7 @@
 
 # TODO(jbeda): Provide a way to override project
 # gcloud multiplexing for shared GCE/GKE tests.
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/../..
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/../..
 source "${KUBE_ROOT}/cluster/gce/config-common.sh"
 
 # Specifying KUBE_GCE_API_ENDPOINT will override the default GCE Compute API endpoint (https://www.googleapis.com/compute/v1/).

cluster/gce/upgrade.sh

@@ -27,7 +27,7 @@ if [[ "${KUBERNETES_PROVIDER:-gce}" != "gce" ]]; then
   exit 1
 fi
 
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/../..
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/../..
 source "${KUBE_ROOT}/hack/lib/util.sh"
 source "${KUBE_ROOT}/cluster/kube-util.sh"
 

cluster/gce/util.sh

@@ -20,7 +20,7 @@
 # config-default.sh.
 readonly GCE_MAX_LOCAL_SSD=8
 
-KUBE_ROOT=$(dirname "${BASH_SOURCE}")/../..
+KUBE_ROOT=$(dirname "${BASH_SOURCE[0]}")/../..
 source "${KUBE_ROOT}/cluster/gce/${KUBE_CONFIG_FILE-"config-default.sh"}"
 source "${KUBE_ROOT}/cluster/common.sh"
 source "${KUBE_ROOT}/hack/lib/util.sh"

third_party/multiarch/qemu-user-static/register/register.sh

@@ -19,13 +19,13 @@ entries="aarch64 aarch64_be alpha arm armeb hppa m68k microblaze microblazeel mi
 if [ "${1}" = "--reset" ]; then
     shift
     (
-    cd /proc/sys/fs/binfmt_misc
+    cd /proc/sys/fs/binfmt_misc || exit
     for file in $entries; do
-        if [ -f qemu-${file} ]; then
-            echo -1 > qemu-${file}
+        if [ -f "qemu-${file}" ]; then
+            echo -1 > "qemu-${file}"
         fi
     done
     )
 fi
 
-exec $(dirname "${BASH_SOURCE}")/qemu-binfmt-conf.sh --qemu-path="${QEMU_BIN_DIR}" $@
+exec $(dirname "${BASH_SOURCE[0]}")/qemu-binfmt-conf.sh --qemu-path="${QEMU_BIN_DIR}" "$@"