mms: introduce a shortcut to quickly rebuild kernel/boot.img

Add a new shortcut to short circuit the long build process that walks
the entire tree collecting all Android.mks. The resulting dependency
list is sufficient to rebuild the kernel, copy product files and
repack the system image with updated modules.

This shortcut allows Kernel devs to rebuild just the boot.img and
kernel modules very quickly (20s vs 3min).

Change-Id: Ie0a69f241ea7b920859ff1e02c3542b79952462c

1 files changed, 26 insertions, 0 deletions

diff --git a/envsetup.sh b/envsetup.sh
index cb49f2a..38f9c6c 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -13,6 +13,8 @@ Invoke ". build/envsetup.sh" from your shell to add the following functions to y
 - mmp:     Builds all of the modules in the current directory and pushes them to the device.
 - mmmp:    Builds all of the modules in the supplied directories and pushes them to the device.
 - mmma:    Builds all of the modules in the supplied directories, and their dependencies.
+- mms:     Short circuit builder. Quickly re-build the kernel, rootfs, boot and system images
+           without deep dependencies. Requires the full build to have run before.
 - cgrep:   Greps on all local C/C++ files.
 - ggrep:   Greps on all local Gradle files.
 - jgrep:   Greps on all local Java files.
@@ -2138,6 +2140,30 @@ function cmka() {
     fi
 }
 
+function mms() {
+    local T=$(gettop)
+    if [ -z "$T" ]
+    then
+        echo "Couldn't locate the top of the tree.  Try setting TOP."
+        return 1
+    fi
+
+    case `uname -s` in
+        Darwin)
+            local NUM_CPUS=$(sysctl hw.ncpu|cut -d" " -f2)
+            ONE_SHOT_MAKEFILE="__none__" \
+                make -C $T -j $NUM_CPUS "$@"
+            ;;
+        *)
+            local NUM_CPUS=$(cat /proc/cpuinfo | grep "^processor" | wc -l)
+            ONE_SHOT_MAKEFILE="__none__" \
+                mk_timer schedtool -B -n 1 -e ionice -n 1 \
+                make -C $T -j $NUM_CPUS "$@"
+            ;;
+    esac
+}
+
+
 function repolastsync() {
     RLSPATH="$ANDROID_BUILD_TOP/.repo/.repo_fetchtimes.json"
     RLSLOCAL=$(date -d "$(stat -c %z $RLSPATH)" +"%e %b %Y, %T %Z")