initrdscripts-secure-core: clean up RDEPENDS

Signed-off-by: Lans Zhang <jia.zhang@windriver.com>

meta/recipes-core/initrdscripts/initrdscripts-secure-core.bb

@@ -1,27 +1,42 @@
 SUMMARY = "Basic init for initramfs to mount and pivot root"
 LICENSE = "MIT"
-LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
+LIC_FILES_CHKSUM = "\
+    file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420 \
+"
 
-SRC_URI = "file://init"
+SRC_URI = "\
+    file://init \
+"
 
 do_install() {
-        install -m 0755 "${WORKDIR}/init" "${D}/init"
+    install -m 0755 "${WORKDIR}/init" "${D}/init"
 
-        # Create device nodes expected by kernel in initramfs
-        # before executing /init.
-        install -d "${D}/dev"
-        mknod -m 0600 "${D}/dev/console" c 5 1
+    # Create device nodes expected by kernel in initramfs
+    # before executing /init.
+    install -d "${D}/dev"
+    mknod -m 0600 "${D}/dev/console" c 5 1
 }
 
-FILES_${PN} = "/init /dev"
-
-RDEPENDS_${PN} += "\
-    bash \
-    kmod \
-    sed \
-    grep \
-    coreutils \
-    util-linux \
-    gawk \
-    udev \
+FILES_${PN} = "\
+    /init \
+    /dev \
+"
+
+# Install the minimal stuffs only, and don't care how the external
+# environment is configured.
+
+# @sysvinit: init
+# @coreutils: echo, cat, sleep, switch_root, expr, mkdir
+# @util-linux: mount
+# @grep: grep
+# @gawk: awk
+# @eudev: udevd, udevadm
+# @procps: pkill
+RDEPENDS_${PN} += "\
+    sysvinit \
+    coreutils \
+    util-linux-mount \
+    grep \
+    gawk \
+    eudev \
 "