--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sources/toys/dev-environment.sh	Mon Mar 15 06:01:36 2010 -0500
@@ -0,0 +1,119 @@
+
+# Set up distcc acceleration
+
+source ./run-emulator.sh --norun || exit 1
+
+# The following environment variables affect the behavior of this script:
+
+# HDB - Image file to use for -hdb on /home (none if blank)
+# HDBMEGS - Number of megabytes to create
+# HDC - Image file to use for -hdc on /mnt (none of blank)
+# QEMU_MEMORY - number of megabytes of memory for qemu (defaults to 128)
+
+# Also, to use the distcc accelerator you need to have distccd and $ARCH-cc
+# in the $PATH.
+
+[ -z "$QEMU_MEMORY" ] && QEMU_MEMORY=256
+QEMU_EXTRA="-m $QEMU_MEMORY $QEMU_EXTRA"
+
+# Should we set up an ext3 image as a second virtual hard drive for /home?
+
+if [ "$HDBMEGS" != "0" ]
+then
+  [ -z "$HDB" ] && HDB=hdb.img
+  if [ ! -e "$HDB" ]
+  then
+
+    # If we don't already have an hdb image, should we set up a sparse file and
+    # format it ext3?
+
+    [ -z "$HDBMEGS" ] && HDBMEGS=2048
+
+    # Some distros don't put /sbin:/usr/sbin in the $PATH for non-root users.
+    [ -z "$(which  mke2fs)" ] && export PATH=/sbin:/usr/bin:$PATH
+
+    dd if=/dev/zero of="$HDB" bs=1024 seek=$[$HDBMEGS*1024-1] count=1 &&
+    mke2fs -q -b 1024 -F "$HDB" -i 4096 &&
+    tune2fs -j -c 0 -i 0 "$HDB"
+
+    [ $? -ne 0 ] && exit 1
+  fi
+fi
+
+# Setup distcc
+
+# If the cross compiler isn't in the $PATH, look for it in the current
+# directory and the user's home directory.
+
+DISTCC_PATH="$(which $ARCH-cc 2>/dev/null | sed 's@\(.*\)/.*@\1@')"
+
+if [ -z "$DISTCC_PATH" ]
+then
+  for i in {"$(pwd)","$HOME"/}{,simple-}cross-compiler-"$ARCH"/bin
+  do
+    [ -f "$i/$ARCH-cc" ] && DISTCC_PATH="$i"
+    break
+  done
+fi
+
+CPUS=1
+if [ -z "$(which distccd)" ]
+then
+  echo 'No distccd in $PATH, acceleration disabled.'
+elif [ -z "$DISTCC_PATH" ]
+then
+  echo "No $ARCH-cc in "'$PATH'", acceleration disabled."
+else
+
+  # Populate a directory full of symlinks to the cross compiler using the
+  # unprefixed names distccd will try to use.
+
+  mkdir -p "distcc_links" &&
+  for i in $(cd "$DISTCC_PATH"; ls $ARCH-* | sed "s/^$ARCH-//" )
+  do
+    ln -sf "$DISTCC_PATH/$ARCH-$i" "distcc_links/$i"
+  done
+  if [ -e "$DISTCC_PATH/$ARCH-rawgcc" ]
+  then
+    for i in cc gcc g++ c++
+    do
+      ln -sf "$DISTCC_PATH/$ARCH-rawgcc" distcc_links/$i
+    done
+  fi
+
+  # Run the distcc daemon on the host system with $PATH restricted to the
+  # cross compiler binaries.
+
+  # Note that we tell it --no-detach and background it ourselves so jobs -p can
+  # find it later to kill it after the emulator exits.
+
+  PORT=$(unique_port)
+  CPUS=$[$(echo /sys/devices/system/cpu/cpu[0-9]* | wc -w)*2]
+  PATH="$(pwd)/distcc_links" "$(which distccd)" --no-detach --daemon \
+    --listen 127.0.0.1 -a 127.0.0.1 -p $PORT --jobs $CPUS \
+    --log-stderr --verbose 2>distccd.log &
+
+  # Clean up afterwards: Kill child processes we started (I.E. distccd).
+  trap "kill $(jobs -p)" EXIT
+
+  # When background processes die, they should do so silently.
+  disown $(jobs -p)
+
+  # Let the QEMU launch know we're using distcc.
+
+  DISTCC_PATH_PREFIX=/usr/distcc:
+  KERNEL_EXTRA="DISTCC_HOSTS=10.0.2.2:$PORT/$CPUS $KERNEL_EXTRA"
+fi
+
+KERNEL_EXTRA="CPUS=$CPUS $KERNEL_EXTRA"
+
+# Kill our child processes on exit.
+
+trap "pkill -P$$" EXIT
+
+# The actual emulator invocation command gets appended here by system-image.sh
+
+[ ! -z "$HDC" ] && QEMU_EXTRA="-hdc $HDC $KERNEL_EXTRA"
+[ ! -z "$HDB" ] && QEMU_EXTRA="-hdb $HDB $KERNEL_EXTRA"
+
+run_emulator