all: Allow multiple config files

This is somewhat an intrusive change, but necessary if we want
to upstream the kdump tooling while allowing great extent of
customizations on SteamOS.

With this change, we have now a kdump.d folder on /usr/share,
that holds configuration files in the same way sysctl.d does.
In other words, we can easily override default settings by
just having more configuration files, which are sourced
following natural name sorting, i.e., we have now the concept
of config file precedence in kdump.

Our default config file is called 00-default, so we eventually
might have a 01-steamos e.g., with Deck's custom settings.
This is planned to other package though.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>

Makefile

@@ -20,4 +20,4 @@ install: all
 	install -D -m0644 README.md $(DESTDIR)$(dracutmodulesdir)/55kdump/README
 	install -D -m0755 kdump-load.sh $(DESTDIR)$(libdir)/kdump/kdump-load.sh
 	install -D -m0755 save-dumps.sh $(DESTDIR)$(libdir)/kdump/save-dumps.sh
-	install -D -m0644 kdump.conf $(DESTDIR)$(sharedir)/kdump/kdump.conf
+	install -D -m0644 00-default.conf $(DESTDIR)$(sharedir)/kdump.d/00-default

kdump-collect.sh

@@ -13,7 +13,13 @@
 #  output for the user.
 #
 
-. /usr/lib/kdump/kdump.conf
+#  We have a more controlled situation with regards the config
+#  files here, since we manually added them in the initrd and
+#  the validation also happened there, during such addition,
+#  hence not requiring checking here.
+for cfg in "/usr/lib/kdump/conf/"/*; do
+	. "$cfg"
+done
 
 VMCORE="/proc/vmcore"
 KDUMP_TIMESTAMP=$(date -u +"%Y%m%d%H%M")

kdump-load.sh

@@ -78,13 +78,21 @@ cleanup_unused_initrd() {
 	rm -f "${INSTALLED_KERNELS}"
 }
 
-
-if [ ! -s "/usr/share/kdump/kdump.conf" ]; then
-	logger "kdump: /usr/share/kdump/kdump.conf is missing, aborting."
-	exit 0
+#  Load the necessary external variables, otherwise it'll fail later.
+HAVE_CFG_FILES=0
+shopt -s nullglob
+for cfg in "/usr/share/kdump.d"/*; do
+	if [ -f "$cfg" ]; then
+		. "$cfg"
+		HAVE_CFG_FILES=1
 	fi
+done
+shopt -u nullglob
 
-. /usr/share/kdump/kdump.conf
+if [ ${HAVE_CFG_FILES} -eq 0 ]; then
+	logger "kdump: no config files in /usr/share/kdump.d/ - aborting."
+	exit 1
+fi
 
 #  Find the proper mount point expected for kdump collection:
 DEVN_MOUNTED="$(findmnt "${MOUNT_DEVNODE}" -fno TARGET)"

module-setup.sh

@@ -19,20 +19,12 @@ installkernel() {
 }
 
 install() {
-    #  Having a valid /usr/share/kdump/kdump.conf is essential for kdump.
-    if [ ! -s "/usr/share/kdump/kdump.conf" ]; then
-        logger "kdump: failed to create initrd, kdump.conf is missing"
-        exit 1
-    fi
-
-    # Also true for makedumpfile...
+    # A valid makedumpfile is essential for the kdump initrd creation.
     if [ ! -x "$(command -v makedumpfile)" ]; then
         logger "kdump: failed to create initrd, makedumpfile is missing"
         exit 1
     fi
 
-    . /usr/share/kdump/kdump.conf
-
     #  First clear all unnecessary firmwares/drivers added by drm in order to
     #  reduce the size of this minimal initramfs being created. This should
     #  be already done via command-line arguments, but let's play safe and delete
@@ -45,7 +37,25 @@ install() {
     inst sync
     inst makedumpfile
 
-    mkdir -p "$initdir"/usr/lib/kdump
+    mkdir -p "$initdir"/usr/lib/kdump/conf
+
+    #  Load the necessary external variables, otherwise it'll fail later.
+    HAVE_CFG_FILES=0
+    shopt -s nullglob
+    for cfg in "/usr/share/kdump.d"/*; do
+        if [ -f "$cfg" ]; then
+            . "$cfg"
+            HAVE_CFG_FILES=1
+        fi
+    done
+    shopt -u nullglob
+
+    if [ ${HAVE_CFG_FILES} -eq 0 ]; then
+        logger "kdump: no config files in /usr/share/kdump.d/ - aborting."
+        exit 1
+    fi
+
+    cp -LR --preserve=all "/usr/share/kdump.d"/* "$initdir"/usr/lib/kdump/conf/
 
     #  Determine the numerical devnode for kdump, and save it on initrd;
     #  notice that partset link is not available that early in boot time.
@@ -53,7 +63,6 @@ install() {
     echo "${DEVN}" > "$initdir"/usr/lib/kdump/kdump.devnode
 
     cp -LR --preserve=all /usr/lib/kdump/* "$initdir"/usr/lib/kdump/
-    cp -LR --preserve=all /usr/share/kdump/kdump.conf "$initdir"/usr/lib/kdump/kdump.conf
 
     inst_hook pre-mount 01 "$moddir/kdump-collect.sh"
 }

save-dumps.sh

@@ -9,14 +9,21 @@
 #  collected data and save it in the local disk, in the next successful boot.
 #
 
-#  We do some validation to be sure KDUMP_MNT pointed path is valid...
-#  That and having a valid /usr/share/kdump/kdump.conf are essential conditions.
-if [ ! -s "/usr/share/kdump/kdump.conf" ]; then
-	logger "kdump: /usr/share/kdump/kdump.conf is missing, aborting."
-	exit 0
+#  Load the necessary external variables, otherwise it'll fail later.
+HAVE_CFG_FILES=0
+shopt -s nullglob
+for cfg in "/usr/share/kdump.d"/*; do
+	if [ -f "$cfg" ]; then
+		. "$cfg"
+		HAVE_CFG_FILES=1
 	fi
+done
+shopt -u nullglob
 
-. /usr/share/kdump/kdump.conf
+if [ ${HAVE_CFG_FILES} -eq 0 ]; then
+	logger "kdump: no config files in /usr/share/kdump.d/ - aborting."
+	exit 1
+fi
 
 KDUMP_MAIN_FOLDER="$(cat "${KDUMP_MNT}")"
 rm -f "${KDUMP_MNT}"