--module-rebuild: Call emerge with --ignore-default-opts

It's possible that user has set conflicting emerge options like
"--ask" in EMERGE_DEFAULT_OPTS which could break genkernel.
Calling emerge with --ignore-default-opts will allow us to
avoid such scenarios.

In addition, --module-rebuild-cmd (MODULEREBUILD_CMD) option was
added to allow user to alter default command.

Closes: https://bugs.gentoo.org/705082
Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>

5 files changed, 39 insertions, 14 deletions

diff --git a/defaults/config.sh b/defaults/config.sh
index d9ea32c..678c0f9 100644
--- a/defaults/config.sh
+++ b/defaults/config.sh
@@ -34,6 +34,8 @@ DEFAULT_COMPRESS_INITRD_TYPE=best
 PORTAGE_MAKEOPTS="$(portageq envvar MAKEOPTS)"
 DEFAULT_MAKEOPTS="${PORTAGE_MAKEOPTS:- -j2}"
 
+DEFAULT_MODULEREBUILD_CMD="emerge --ignore-default-opts --quiet @module-rebuild"
+
 DEFAULT_KERNEL_MAKE=make
 DEFAULT_UTILS_MAKE=make
 
diff --git a/doc/genkernel.8.txt b/doc/genkernel.8.txt
index 6c4c155..e9076a4 100644
--- a/doc/genkernel.8.txt
+++ b/doc/genkernel.8.txt
@@ -196,10 +196,17 @@ specified.
     Copies or does not copy all kernel modules to the initrd.
 
 *--*[*no-*]*module-rebuild*::
-    Runs, or does not run "emerge @module-rebuild" to build out-of-tree
-    modules when possible, i.e. when non-static kernel and modules will be
-    build, installed, no custom INSTALL_MOD_PATH is set,
-    '/var/lib/module-rebuild/moduledb' exists and is not empty.
+    Runs, or does not run "emerge --ignore-default-opts --quiet @module-rebuild"
+    to build out-of-tree modules when possible, i.e. when non-static
+    kernel and modules will be build, installed, no custom
+    'INSTALL_MOD_PATH' is set, '/var/lib/module-rebuild/moduledb' exists
+    and is not empty.
+
+NOTE: Command can be customized using '--module-rebuild-cmd' command-line
+argument or 'MODULEREBUILD_CMD' in '/etc/genkernel.conf'.
+
+*--module-rebuild-cmd*=<...>::
+    Overwrite default *--module-rebuild* command.
 
 *--callback*=<...>::
     Run the specified arguments in the current environment after the
diff --git a/gen_cmdline.sh b/gen_cmdline.sh
index 025187f..db9c1f8 100755
--- a/gen_cmdline.sh
+++ b/gen_cmdline.sh
@@ -65,6 +65,8 @@ longusage() {
   echo "	--module-rebuild	Automatically run 'emerge @module-rebuild' when"
   echo "				necessary (and possible)"
   echo "	--no-module-rebuild	Don't automatically run 'emerge @module-rebuild'"
+  echo "	--module-rebuild-cmd=<...>"
+  echo "				Overwrite default --module-rebuild command"
   echo "	--callback=<...>	Run the specified arguments after the"
   echo "				kernel and modules have been compiled"
   echo "	--static		Build a static (monolithic kernel)"
@@ -606,6 +608,10 @@ parse_cmdline() {
 			CMD_MODULEREBUILD=$(parse_optbool "$*")
 			print_info 3 "CMD_MODULEREBUILD: ${CMD_MODULEREBUILD}"
 			;;
+		--module-rebuild-cmd=*)
+			CMD_MODULEREBUILD_CMD="${*#--module-rebuild-cmd=}"
+			print_info 3 "CMD_MODULEREBUILD_CMD: ${CMD_MODULEREBUILD_CMD}"
+			;;
 		--callback=*)
 			CMD_CALLBACK="${*#*=}"
 			print_info 3 "CMD_CALLBACK: ${CMD_CALLBACK}/$*"
diff --git a/gen_compile.sh b/gen_compile.sh
index 3f10adb..3b96f48 100755
--- a/gen_compile.sh
+++ b/gen_compile.sh
@@ -2,53 +2,51 @@
 # $Id$
 
 compile_external_modules() {
-	local command="emerge --quiet @module-rebuild 2>&1"
-
 	if ! isTrue "${CMD_MODULEREBUILD}"
 	then
-		print_info 3 "$(get_indent 1)>> --no-module-rebuild set; Skipping 'emerge @module-rebuild' ..."
+		print_info 3 "$(get_indent 1)>> --no-module-rebuild set; Skipping '${MODULEREBUILD_CMD}' ..."
 		return
 	fi
 
 	if isTrue "$(tc-is-cross-compiler)"
 	then
-		print_info 3 "$(get_indent 1)>> Cross-compilation detected; Skipping 'emerge @module-rebuild' ..."
+		print_info 3 "$(get_indent 1)>> Cross-compilation detected; Skipping '${MODULEREBUILD_CMD}' ..."
 		return
 	fi
 
 	if ! isTrue "${CMD_INSTALL}"
 	then
-		print_info 3 "$(get_indent 1)>> --no-install set; Skipping 'emerge @module-rebuild' ..."
+		print_info 3 "$(get_indent 1)>> --no-install set; Skipping '${MODULEREBUILD_CMD}' ..."
 		return
 	fi
 
 	if [ -n "${INSTALL_MOD_PATH}" ]
 	then
 		# emerge would install to a different location
-		print_warning 1 "$(get_indent 1)>> INSTALL_MOD_PATH set; Skipping 'emerge @module-rebuild' ..."
+		print_warning 1 "$(get_indent 1)>> INSTALL_MOD_PATH set; Skipping '${MODULEREBUILD_CMD}' ..."
 		return
 	fi
 
 	local modulesdb_file="/var/lib/module-rebuild/moduledb"
 	if [ ! -s "${modulesdb_file}" ]
 	then
-		print_info 2 "$(get_indent 1)>> '${modulesdb_file}' does not exist or is empty; Skipping 'emerge @module-rebuild' ..."
+		print_info 2 "$(get_indent 1)>> '${modulesdb_file}' does not exist or is empty; Skipping '${MODULEREBUILD_CMD}' ..."
 		return
 	fi
 
 	local -x KV_OUT_DIR="${KERNEL_OUTPUTDIR}"
 
 	print_info 1 "$(get_indent 1)>> Compiling out-of-tree module(s) ..."
-	print_info 3 "COMMAND: ${command}" 1 0 1
+	print_info 3 "COMMAND: ${MODULEREBUILD_CMD}" 1 0 1
 
 	if [ "${LOGLEVEL}" -gt 3 ]
 	then
 		# Output to stdout and logfile
-		eval ${command} | tee -a "${LOGFILE}"
+		eval ${MODULEREBUILD_CMD} 2>&1 | tee -a "${LOGFILE}"
 		RET=${PIPESTATUS[0]}
 	else
 		# Output to logfile only
-		eval ${command} >> "${LOGFILE}"
+		eval ${MODULEREBUILD_CMD} 2>&1 >> "${LOGFILE}"
 		RET=$?
 	fi
 
diff --git a/gen_determineargs.sh b/gen_determineargs.sh
index 616f4fe..61521d6 100755
--- a/gen_determineargs.sh
+++ b/gen_determineargs.sh
@@ -317,6 +317,7 @@ determine_real_args() {
 	set_config_with_override STRING MINKERNPACKAGE                        CMD_MINKERNPACKAGE
 	set_config_with_override STRING MODULESPACKAGE                        CMD_MODULESPACKAGE
 	set_config_with_override BOOL   MODULEREBUILD                         CMD_MODULEREBUILD                         "yes"
+	set_config_with_override STRING MODULEREBUILD_CMD                     CMD_MODULEREBUILD_CMD                     "${DEFAULT_MODULEREBUILD_CMD}"
 	set_config_with_override STRING KERNCACHE                             CMD_KERNCACHE
 	set_config_with_override BOOL   RAMDISKMODULES                        CMD_RAMDISKMODULES                        "yes"
 	set_config_with_override BOOL   ALLRAMDISKMODULES                     CMD_ALLRAMDISKMODULES                     "no"
@@ -781,6 +782,17 @@ determine_real_args() {
 			# Kernel Makefile doesn't support spaces in outputdir path...
 			gen_die "--kernel-outputdir '${KERNEL_OUTPUTDIR}' contains space character(s) which are not supported!"
 		fi
+
+		if isTrue "${CMD_MODULEREBUILD}"
+		then
+			if [ -z "${MODULEREBUILD_CMD}" ]
+			then
+				gen_die "--module-rebuild-cmd cannot be empty when --module-rebuild is set!"
+			elif [[ "${MODULEREBUILD_CMD}" == *[\$\&\|\>\(\)]* ]]
+			then
+				gen_die "--module-rebuild-cmd '${MODULEREBUILD_CMD}' contains at least one of the following disallowed characters: '\$&|>()'!"
+			fi
+		fi
 	fi
 
 	if isTrue "${BUILD_RAMDISK}"