Add ShellSpec tests for managing the crashkernel kernel parameter

Signed-off-by: Coiby Xu <coxu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>

kdumpctl

@@ -1666,12 +1666,13 @@ reset_crashkernel()
 	fi
 }
 
+GRUB_CFG=/boot/grub2/grub.cfg
 _is_bootloader_installed()
 {
 	if [[ $(uname -m) == s390x ]]; then
 		test -f /etc/zipl.conf
 	else
-		test -f /boot/grub2/grub.cfg
+		test -f "$GRUB_CFG"
 	fi
 }
 

spec/kdumpctl_manage_crashkernel_spec.sh

@@ -0,0 +1,107 @@
+#!/bin/bash
+
+Describe 'Management of the kernel crashkernel parameter.'
+	Include ./kdumpctl
+	kernel1=/boot/vmlinuz-5.15.6-100.fc34.x86_64
+	kernel2=/boot/vmlinuz-5.14.14-200.fc34.x86_64
+	old_ck=1G-4G:162M,4G-64G:256M,64G-:512M
+	new_ck=1G-4G:196M,4G-64G:256M,64G-:512M
+	KDUMP_SPEC_TEST_RUN_DIR=$(mktemp -u /tmp/spec_test.XXXXXXXXXX)
+	GRUB_CFG="$KDUMP_SPEC_TEST_RUN_DIR/grub.cfg"
+
+	uname() {
+		if [[ $1 == '-m' ]]; then
+			echo -n x86_64
+		elif [[ $1 == '-r' ]]; then
+			echo -n $current_kernel
+		fi
+	}
+
+	# dinfo is a bit complex for unit tets, simply mock it
+	dinfo() {
+		echo "$1"
+	}
+
+	kdump_get_arch_recommend_crashkernel() {
+		echo -n "$new_ck"
+	}
+
+	setup() {
+		mkdir -p "$KDUMP_SPEC_TEST_RUN_DIR"
+		cp -r spec/support/boot_load_entries "$KDUMP_SPEC_TEST_RUN_DIR"
+		cp spec/support/grub_env "$KDUMP_SPEC_TEST_RUN_DIR"/env_temp
+		touch "$GRUB_CFG"
+
+		grubby --args crashkernel=$old_ck --update-kernel=$kernel1
+		grubby --args crashkernel=$new_ck --update-kernel=$kernel2
+		grubby --remove-args fadump --update-kernel=ALL
+
+	}
+
+	cleanup() {
+		rm -rf "$KDUMP_SPEC_TEST_RUN_DIR"
+	}
+
+	grubby() {
+		# - --no-etc-grub-update, not update /etc/default/grub
+		# - --bad-image-okay, don't check the validity of the image
+		# - --env, specify custom grub2 environment block file to avoid modifying
+		#   the default /boot/grub2/grubenv
+		# - --bls-directory, specify custom BootLoaderSpec config files to avoid
+		#   modifying the default /boot/loader/entries
+		@grubby --no-etc-grub-update --grub2 --config-file="$GRUB_CFG" --bad-image-okay --env="$KDUMP_SPEC_TEST_RUN_DIR"/env_temp -b "$KDUMP_SPEC_TEST_RUN_DIR"/boot_load_entries "$@"
+	}
+
+	Describe "When kexec-tools have its default crashkernel updated, "
+
+		Context "if kexec-tools is updated alone, "
+			BeforeAll 'setup'
+			AfterAll 'cleanup'
+			Specify 'reset_crashkernel_after_update should report updated kernels and note that auto_reset_crashkernel=yes'
+				When call reset_crashkernel_after_update
+				The output should include "For kernel=$kernel1, crashkernel=$new_ck now."
+				The output should not include "For kernel=$kernel2, crashkernel=$new_ck now."
+				# A hint on how to turn off auto update of crashkernel
+				The output should include "auto_reset_crashkernel=no"
+			End
+
+			Specify 'kernel1 should have crashkernel updated'
+				When call grubby --info $kernel1
+				The line 3 of output should include crashkernel="$new_ck"
+			End
+
+			Specify 'kernel2 should also have crashkernel updated'
+				When call grubby --info $kernel2
+				The line 3 of output should include crashkernel="$new_ck"
+			End
+
+		End
+
+		Context "If kernel package is installed alone, "
+			BeforeAll 'setup'
+			AfterAll 'cleanup'
+			# BeforeAll somehow doesn't work as expected, manually call setup to bypass this issue.
+			setup
+			new_kernel_ver=new_kernel
+			new_kernel=/boot/vmlinuz-$new_kernel_ver
+			grubby --add-kernel=$new_kernel --initrd=/boot/initramfs-$new_kernel_ver.img --title=$new_kernel_ver
+
+			Specify 'reset_crashkernel_for_installed_kernel should report the new kernel has its crashkernel updated'
+				When call reset_crashkernel_for_installed_kernel $new_kernel_ver
+				The output should include "crashkernel=$new_ck"
+			End
+
+			Specify 'the new kernel should have crashkernel updated'
+				When call grubby --info $new_kernel
+				The output should include crashkernel="$new_ck"
+			End
+
+			Specify 'kernel1 keeps its crashkernel value'
+				When call grubby --info $kernel1
+				The output should include crashkernel="$old_ck"
+			End
+
+		End
+
+	End
+End