Add kdump dracut config

In some cases, we need to change dracut [omit_]dracutmodules to
customize the first kernel's initrd to meet the needs, such as
bootc and CoreOS.

In most cases kdump does not use these modules, but the change of
[omit]_dracutmodules may break existing functionality. For example,
if we set omit_dracutmodules='nfs', the nfs module cannot be added
even if we use "dracut_args --force-add 'nfs'".

Some dracut conf may override dracutmodules variable, this also may
break the building of kdump img. We need to keep it empty.

It is better to maintain its own dracut config for kdump. This patch
moved the hardcoded dracut modules and omit modules to the new conf
dir /lib/kdump/dracut.conf.d/99-kdump.conf.

Dracut will support --add-confdir start by 104, kdump can use this
option when building kdump initramfs. If --add-confdir is not
available in your system, kdump will use --confdir, in this case,
the default confdir "/etc/dracut.conf.d" will not work while
generating kdump initrd.

Suggested-by: Dave Young <[email protected]>
Suggested-by: Colin Walters <[email protected]>
Signed-off-by: Lichen Liu <[email protected]>

99-kdump.conf

@@ -0,0 +1,3 @@
+dracutmodules=''
+add_dracutmodules+='kdumpbase'
+omit_dracutmodules+='rdma plymouth resume ifcfg earlykdump'

Makefile

@@ -33,7 +33,7 @@ manpages:
 	install -D -m 644 kdump.conf.5 $(DESTDIR)$(mandir)/man5/kdump.conf.5
 
 install: dracut-modules kdump-conf kdump-sysconfig manpages
-	mkdir -p $(DESTDIR)$(pkglibdir)
+	mkdir -p $(DESTDIR)$(pkglibdir)/dracut.conf.d
 	mkdir -p -m755 $(DESTDIR)$(sysconfdir)/kdump/pre.d
 	mkdir -p -m755 $(DESTDIR)$(sysconfdir)/kdump/post.d
 	mkdir -p -m755 $(DESTDIR)$(localstatedir)/crash
@@ -46,6 +46,7 @@ install: dracut-modules kdump-conf kdump-sysconfig manpages
 	install -D -m 644 kdump.conf $(DESTDIR)$(sysconfdir)
 	install -D -m 644 kdump.sysconfig $(DESTDIR)$(sysconfdir)/sysconfig/kdump
 	install -D -m 755 kdump-lib.sh kdump-lib-initramfs.sh kdump-logger.sh -t $(DESTDIR)$(pkglibdir)
+	install -D -m 644 99-kdump.conf -t $(DESTDIR)$(pkglibdir)/dracut.conf.d
 
 ifeq ($(ARCH), $(filter ppc64le ppc64,$(ARCH)))
 	install -m 755 mkfadumprd $(DESTDIR)$(sbindir)

mkdumprd

@@ -29,15 +29,13 @@ SSH_KEY_LOCATION=$DEFAULT_SSHKEY
 SAVE_PATH=$(get_save_path)
 
 declare -a dracut_args
-dracut_args+=(--add kdumpbase)
 dracut_args+=(--quiet)
 dracut_args+=(--hostonly)
 dracut_args+=(--hostonly-cmdline)
 dracut_args+=(--hostonly-i18n)
 dracut_args+=(--hostonly-mode strict)
 dracut_args+=(--hostonly-nics '')
 dracut_args+=(--aggressive-strip)
-dracut_args+=(--omit "rdma plymouth resume ifcfg earlykdump")
 
 MKDUMPRD_TMPDIR="$(mktemp -d -t mkdumprd.XXXXXX)"
 [ -d "$MKDUMPRD_TMPDIR" ] || perror_exit "dracut: mktemp -p -d -t dracut.XXXXXX failed."
@@ -441,4 +439,18 @@ elif ! is_fadump_capable && \
 	add_mount "$status_target"
 fi
 
+# Use kdump managed dracut profile.
+_dracut_add_confdir_option="--confdir"
+if dracut --help | grep -q "add-confdir" ; then
+	_dracut_add_confdir_option="--add-confdir"
+fi
+
+[[ $kdumpdracutconfdir ]] || kdumpdracutconfdir=/lib/kdump/dracut.conf.d
+if [ -d "$kdumpdracutconfdir" ]; then
+	dracut_args+=("$_dracut_add_confdir_option" "$kdumpdracutconfdir")
+else
+	dracut_args+=(--add kdumpbase)
+	dracut_args+=(--omit "rdma plymouth resume ifcfg earlykdump")
+fi
+
 dracut "${dracut_args[@]}" "$@"