Add ability to set niceness for make.

Default niceness adjustment set to +19, to avoid buildkernel clogging
up the system.

buildkernel

@@ -3,7 +3,7 @@
 # Build kernel, modules and initial ramdisk in correct sequence, ensuring kernel
 # config is conformed, then sign if possible and copy to EFI boot partition.
 #
-# Copyright (c) 2014-2016 sakaki <[email protected]>
+# Copyright (c) 2014-2017 sakaki <[email protected]>
 #
 # License (GPL v3.0)
 # ------------------
@@ -31,7 +31,7 @@ shopt -s nullglob
 # ********************** variables ********************* 
 PROGNAME="$(basename "${0}")"
 CONFFILE="/etc/${PROGNAME}.conf"
-VERSION="1.0.17"
+VERSION="1.0.18"
 ETCPROFILE="/etc/profile"
 DEFAULTEFIBOOTFILE="bootx64.efi"
 EFIBOOTFILE="${DEFAULTEFIBOOTFILE}"
@@ -118,6 +118,7 @@ VERBOSITYFLAG=""
 ASKFLAG=""
 ALERTFLAG=""
 PORTAGEINFO=""
+MAKE=""
 # following array variables set by find_all_gpg_keyfile_partitions function
 declare -a GPGUUIDS GPGPARTNAMES GPGDEVNAMES GPGPARTNUMS
 # following array variables set by find_all_luks_partitions function
@@ -161,6 +162,8 @@ declare -i ARG_STAGEONLY=0 ARG_UNMOUNTATEND=0 ARG_VERBOSE=0 ARG_VERSION=0
 declare -i ARG_POSTCLEAR=0 ARG_MENUCONFIG=0 ARG_SNAPSHOTBACKUP=0
 declare -i ARG_EASYSETUP=0 ARG_IS_NEW_KERNEL_AVAILABLE=0
 declare -i ARG_REBUILD_EXTERNAL_MODULES=0 ARG_ALERT=0
+# non-boolean arguments
+declare -i ADJUSTMENT=19
 
 # ***************** various functions ****************** 
 cleanup_and_exit_with_code() {
@@ -1652,7 +1655,7 @@ clean_kernel_tree_if_desired() {
     fi
     if ((DOCLEAN==1)); then
         show "Cleaning up..."
-        make clean # not mrproper - so our .config file will be left alone
+        ${MAKE} clean # not mrproper - so our .config file will be left alone
     fi
 }
 kernel_build_pass_1() {
@@ -1661,13 +1664,13 @@ kernel_build_pass_1() {
     rm ${VERBOSITYFLAG} -f "${UNCOMPRESSEDINITRAMFS}"
     touch "${UNCOMPRESSEDINITRAMFS}"
     show "Building ${NEWVERSION} (pass 1 - dummy initramfs)..."
-    make modules_prepare
-    make -j ${NUMCPUSPLUSONE}
-    make install
+    ${MAKE} modules_prepare
+    ${MAKE} -j ${NUMCPUSPLUSONE}
+    ${MAKE} install
     show "Installing modules..."
-    make modules_install
+    ${MAKE} modules_install
     show "Installing firmware..."
-    make firmware_install
+    ${MAKE} firmware_install
 }
 rebuild_external_modules_if_necessary() {
     if ((ARG_REBUILD_EXTERNAL_MODULES==1)); then
@@ -1747,9 +1750,9 @@ repack_initramfs() {
 }
 kernel_build_pass_2() {
     show "Building ${NEWVERSION} (pass 2, to include real initramfs)..."
-    make -j ${NUMCPUSPLUSONE}
+    ${MAKE} -j ${NUMCPUSPLUSONE}
     show "Installing boot files to ${BOOTDIR}; for reference only..."
-    make install
+    ${MAKE} install
     # no need to re-install modules or firmware - only the initramfs has changed
 }
 sign_kernel_if_possible() {
@@ -1954,6 +1957,9 @@ Options:
                         (at /boot), or 1 otherwise
   -m, --menuconfig      show kernel configuration GUI, even if non-interactive
   -p, --postclear       clear genkernel temporary files and caches after run
+  -r, --adjustment=N    add integer N to the make niceness -20<=N<=19
+                        (the default is 19; this runs make at the lowest
+                        priority to avoid slowing the system too much)
   -s, --stage-only      prepare kernel in /boot as usual, but do not copy 
                         to system partition
   -u, --unmount-at-end  umount the EFI system partition on successful exit
@@ -1993,6 +1999,9 @@ internal_consistency_option_checks() {
     if ((ARG_MENUCONFIG==1 && ARG_COPYFROMSTAGING==1)); then
         display_usage_message_and_bail_out "--menuconfig if meaningless with --copy-from-staging"
     fi
+    if ((ADJUSTMENT<-20 || ADJUSTMENT>19)); then
+            display_usage_message_and_bail_out "must have -20 <= make niceness adjustment <= 19"
+    fi
 }
 snapshot_kernel_on_efi_partition() {
     local TIMESTAMP_PREFIX=$(date +"%Y-%m-%d-%H-%M-%S-")
@@ -2019,7 +2028,7 @@ process_command_line_options() {
     declare -i RC
     set +e
         # error trapping off, as we want to handle errors
-        TEMP="$(getopt -o aAbcefhimpsuvxV --long ask,alert,snapshot-backup,clean,easy-setup,copy-from-staging,help,is-new-kernel-available,menuconfig,postclear,stage-only,verbose,unmount-at-end,rebuild-external-modules,version -n "${PROGNAME}" -- "${@}")"
+        TEMP="$(getopt -o aAbcefhimpr:suvxV --long ask,alert,snapshot-backup,clean,easy-setup,copy-from-staging,help,is-new-kernel-available,menuconfig,postclear,adjustment:,stage-only,verbose,unmount-at-end,rebuild-external-modules,version -n "${PROGNAME}" -- "${@}")"
         RC="${?}"
     set -e
     if ((RC!=0)); then
@@ -2040,6 +2049,11 @@ process_command_line_options() {
             -i|--is-new-kernel-available) ARG_IS_NEW_KERNEL_AVAILABLE=1 ; shift ;;
             -m|--menuconfig) ARG_MENUCONFIG=1 ; shift ;;
             -p|--postclear) ARG_POSTCLEAR=1 ; shift ;;
+            -r|--adjustment)
+                case "${2}" in
+                    "") shift 2 ;;
+                    *) ADJUSTMENT="${2}" ; shift 2 ;;
+                esac ;;
             -s|--stage-only) ARG_STAGEONLY=1 ; shift ;;
             -u|--unmount-at-end) ARG_UNMOUNTATEND=1 ; shift ;;
             -v|--verbose) ARG_VERBOSE=1 ; shift ;;
@@ -2049,6 +2063,8 @@ process_command_line_options() {
             *) die "Internal error!" ;;
         esac
     done
+    # setup make with specified niceness
+    MAKE="nice -n ${ADJUSTMENT} make"
     # set verbosity
     if ((ARG_VERBOSE==1)); then
         VERBOSITY+=1

buildkernel.8

@@ -1,4 +1,4 @@
-.TH BUILDKERNEL 8 "Version 1.0.17: May 2016"
+.TH BUILDKERNEL 8 "Version 1.0.18: January 2017"
 .SH NAME
 buildkernel \- build secure boot kernel, save to EFI system partition
 .SH SYNOPSIS
@@ -146,6 +146,15 @@ b) in interactive move, ask you whether or not you wish to \fBmake menuconfig\fR
 .BR \-p ", " \-\-postclear
 Clears all \fBgenkernel\fR(8) temporary files and caches after run.
 .TP
+.BR \-r ", " \-\-adjustment\=N
+Specifies the \fBnice\fR(1) adjustment value N (-20<=N<=19) under which
+to run \fBmake\fR(1) operations.
+
+If this option is unspecified, the default niceness adjustment value is 19,
+which causes invoked makes to run at the lowest possible
+priority; this is useful to prevent \fBbuildkernel\fR clogging up your
+system. Be careful about using negative values!
+.TP
 .BR \-s ", " \-\-stage\-only
 When this option is specified, \fBbuildkernel\fR will create the kernel in
 the \fI/boot\fR staging directory as usual, but will not copy the result across
@@ -231,7 +240,7 @@ A post-reboot run of \fBgenup\fR(8) will achieve this.
 
 .SH COPYRIGHT
 .nf
-Copyright \(co 2014-2016 sakaki
+Copyright \(co 2014-2017 sakaki
 License GPLv3+ (GNU GPL version 3 or later)
 <http://gnu.org/licenses/gpl.html>
 
@@ -244,6 +253,7 @@ sakaki \(em send bug reports or comments to <[email protected]>
 .BR emerge (1),
 .BR gpg (1),
 .BR make (1),
+.BR nice (1),
 .BR systemd (1),
 .BR cryptsetup (8),
 .BR genkernel (8),

buildkernel.conf.5

@@ -1,4 +1,4 @@
-.TH BUILDKERNEL 5 "Version 1.0.17: May 2016"
+.TH BUILDKERNEL 5 "Version 1.0.18: January 2017"
 .SH NAME
 buildkernel.conf \- a configuration file for \fBbuildkernel\fR(8)
 .SH SYNOPSIS
@@ -173,7 +173,7 @@ function exit.
 .RE
 .SH COPYRIGHT
 .nf
-Copyright \(co 2014-2016 sakaki
+Copyright \(co 2014-2017 sakaki
 License GPLv3+ (GNU GPL version 3 or later)
 <http://gnu.org/licenses/gpl.html>