[PATCH v2 3/3] fadump: add a kernel install hook to clean up fadump initramfs

[Hari Bathini]

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 
---

* Could have had 60-kdump.install.ppc64 that takes care of both kdump
  & fadump cleanup for ppc64 but that needs kdump cleanup code to be
  maintained in two files. So, preferred to go with a separate install
  file (60-fadump.install) instead.

Changes in v2:
* Added cleanup of kernel version based checksum file.

60-fadump.install | 32 ++++++++++++++++++++++++++++++++
 kexec-tools.spec  |  3 +++
 2 files changed, 35 insertions(+)
 create mode 100755 60-fadump.install

diff --git a/60-fadump.install b/60-fadump.install
new file mode 100755
index 0000000..c317d9c
--- /dev/null
+++ b/60-fadump.install
@@ -0,0 +1,32 @@
+#!/usr/bin/bash
+
+COMMAND="$1"
+KERNEL_VERSION="$2"
+
+if ! [[ ${KERNEL_INSTALL_MACHINE_ID-x} ]]; then
+    exit 0
+fi
+
+# Currently, fadump is supported only in environments with
+# writable /boot directory.
+if [[ ! -w "/boot" ]]; then
+    exit 0
+fi
+
+FADUMP_INITRD_DIR_ABS="/boot"
+FADUMP_INITRD=".initramfs-${KERNEL_VERSION}.img.default"
+FADUMP_INITRD_CHECKSUM=".fadump_initrd_checksum.${KERNEL_VERSION}"
+
+ret=0
+case "$COMMAND" in
+    add)
+        # Do nothing, fadump initramfs is strictly host only
+        # and managed by kdump service
+        ;;
+    remove)
+        rm -f -- "$FADUMP_INITRD_DIR_ABS/$FADUMP_INITRD"
+        rm -f -- "$FADUMP_INITRD_DIR_ABS/$FADUMP_INITRD_CHECKSUM"
+        ret=$?
+        ;;
+esac
+exit $ret
diff --git a/kexec-tools.spec b/kexec-tools.spec
index bfa7a5b..d4c3590 100644
--- a/kexec-tools.spec
+++ b/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
@@ -203,6 +204,7 @@ 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
@@ -365,6 +367,7 @@ fi
 %endif
 %ifarch ppc64 ppc64le
 /usr/sbin/mkfadumprd
+%{_prefix}/lib/kernel/install.d/60-fadump.install
 %endif
 /usr/sbin/mkdumprd
 /usr/sbin/vmcore-dmesg