fadump: add a kernel install hook to clean up fadump initramfs

Kdump service will create fadump initramfs when needed, but it won't
clean up the fadump initramfs on kernel uninstall. So create a kernel
install hook to do the clean up job.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>

60-fadump.install

@@ -0,0 +1,31 @@
+#!/usr/bin/bash
+
+COMMAND="$1"
+KERNEL_VERSION="$2"
+
+if ! [[ ${KERNEL_INSTALL_MACHINE_ID-x} ]]; then
+    exit 0
+fi
+
+# Currently, fadump is supported only in environments with
+# writable /boot directory.
+if [[ ! -w "/boot" ]]; then
+    exit 0
+fi
+
+FADUMP_INITRD="/boot/.initramfs-${KERNEL_VERSION}.img.default"
+FADUMP_INITRD_CHECKSUM="$FADUMP_INITRD.checksum"
+
+ret=0
+case "$COMMAND" in
+    add)
+        # Do nothing, fadump initramfs is strictly host only
+        # and managed by kdump service
+        ;;
+    remove)
+        rm -f -- "$FADUMP_INITRD"
+        rm -f -- "$FADUMP_INITRD_CHECKSUM"
+        ret=$?
+        ;;
+esac
+exit $ret

kexec-tools.spec

@@ -38,6 +38,7 @@ Source33: 92-crashkernel.install
 Source34: crashkernel-howto.txt
 Source35: kdump-migrate-action.sh
 Source36: kdump-restart.sh
+Source37: 60-fadump.install
 
 #######################################
 # These are sources for mkdumpramfs
@@ -204,6 +205,7 @@ install -m 644 %{SOURCE13} $RPM_BUILD_ROOT%{_udevrulesdir}/98-kexec.rules
 %endif
 %ifarch ppc64 ppc64le
 install -m 644 %{SOURCE14} $RPM_BUILD_ROOT%{_udevrulesdir}/98-kexec.rules
+install -m 755 -D %{SOURCE37} $RPM_BUILD_ROOT%{_prefix}/lib/kernel/install.d/60-fadump.install
 %endif
 install -m 644 %{SOURCE15} $RPM_BUILD_ROOT%{_mandir}/man5/kdump.conf.5
 install -m 644 %{SOURCE16} $RPM_BUILD_ROOT%{_unitdir}/kdump.service
@@ -366,6 +368,7 @@ fi
 %endif
 %ifarch ppc64 ppc64le
 /usr/sbin/mkfadumprd
+%{_prefix}/lib/kernel/install.d/60-fadump.install
 %endif
 /usr/sbin/mkdumprd
 /usr/sbin/vmcore-dmesg