module-setup.sh: don't polute the namespace unnecessarily

Only source kdump libs when building a kdump initramfs.

Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Lianbo Jiang <lijiang@redhat.com>

dracut-early-kdump-module-setup.sh

@@ -1,7 +1,6 @@
 #!/bin/bash
 
 . /etc/sysconfig/kdump
-. /lib/kdump/kdump-lib.sh
 
 KDUMP_KERNEL=""
 KDUMP_INITRD=""
@@ -21,6 +20,8 @@ depends() {
 }
 
 prepare_kernel_initrd() {
+    . /lib/kdump/kdump-lib.sh
+
     prepare_kdump_bootinfo
 
     # $kernel is a variable from dracut

dracut-module-setup.sh

@@ -1,10 +1,12 @@
 #!/bin/bash
 
-. /lib/kdump/kdump-lib.sh
+kdump_module_init() {
+    if ! [[ -d "${initdir}/tmp" ]]; then
+        mkdir -p "${initdir}/tmp"
+    fi
 
-if ! [[ -d "${initdir}/tmp" ]]; then
-    mkdir -p "${initdir}/tmp"
-fi
+    . /lib/kdump/kdump-lib.sh
+}
 
 check() {
     [[ $debug ]] && set -x
@@ -19,6 +21,8 @@ check() {
 depends() {
     local _dep="base shutdown"
 
+    kdump_module_init
+
     add_opt_module() {
         [[ " $omit_dracutmodules " != *\ $1\ * ]] && _dep="$_dep $1"
     }
@@ -825,6 +829,7 @@ kdump_install_systemd_conf() {
 }
 
 install() {
+    kdump_module_init
     kdump_install_conf
     overwrite_sysctl_conf