Adds gmergefs. A method of remoting to a target and pushing new

src/scripts/enter_chroot.sh

 #!/bin/bash
 
 # Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to enter the chroot environment
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
 # Script must be run outside the chroot and as a regular user.
 assert_outside_chroot
 assert_not_root_user
 
 # Define command line flags
 # See http://code.google.com/p/shflags/wiki/Documentation10x
 DEFINE_string chroot "$DEFAULT_CHROOT_DIR" \
   "The destination dir for the chroot environment." "d"
 DEFINE_string trunk "$GCLIENT_ROOT" \
   "The source trunk to bind mount within the chroot." "s"
 DEFINE_string build_number "" \
   "The build-bot build number (when called by buildbot only)." "b"
 DEFINE_string chrome_root "" \
   "The root of your chrome browser source. Should contain a 'src' subdir."
 
-DEFINE_boolean official_build $FLAGS_FALSE "Set CHROMEOS_OFFICIAL=1 for release builds."
+DEFINE_boolean official_build $FLAGS_FALSE \
+  "Set CHROMEOS_OFFICIAL=1 for release builds."
 DEFINE_boolean mount $FLAGS_FALSE "Only set up mounts."
 DEFINE_boolean unmount $FLAGS_FALSE "Only tear down mounts."
 
 # More useful help
 FLAGS_HELP="USAGE: $0 [flags] [VAR=value] [-- \"command\"]
 
 One or more VAR=value pairs can be specified to export variables into
 the chroot environment.  For example:
 
    $0 FOO=bar BAZ=bel
@@ skipping 18 matching lines @@
 fi
 
 # Only now can we die on error.  shflags functions leak non-zero error codes,
 # so will die prematurely if 'set -e' is specified before now.
 # TODO: replace shflags with something less error-prone, or contribute a fix.
 set -e
 
 INNER_CHROME_ROOT="/home/$USER/chrome_root"  # inside chroot
 CHROME_ROOT_CONFIG="/var/cache/chrome_root"  # inside chroot
 INNER_DEPOT_TOOLS_ROOT="/home/$USER/depot_tools"  # inside chroot
+KERNEL_MODULES_ROOT="/lib/modules/$( uname -r )" # inside and outside chroot
+FUSE_DEVICE="/dev/fuse"
 
 sudo chmod 0777 "$FLAGS_chroot/var/lock"
 
 LOCKFILE="$FLAGS_chroot/var/lock/enter_chroot"
 
 function setup_env {
   (
     flock 200
     echo $$ >> "$LOCKFILE"
 
@@ skipping 54 matching lines @@
     then
       if [ $(which gclient 2>/dev/null) ]; then
         echo "Mounting depot_tools"
         DEPOT_TOOLS=$(dirname $(which gclient) )
         mkdir -p "$MOUNTED_PATH"
         if ! sudo mount --bind "$DEPOT_TOOLS" "$MOUNTED_PATH"; then
           echo "depot_tools failed to mount; perhaps it's on NFS?"
           echo "This may impact chromium build."
         fi
       fi
-    fi
+    fi    
+        
+    # Mount fuse device from host machine into chroot and copy over
+    # corresponding kernel modules.
+    MOUNTED_PATH="$(readlink -f "${FLAGS_chroot}${FUSE_DEVICE}")"
+    if [ -z "$(mount | grep -F "on ${MOUNTED_PATH} ")" ]
+    then
+      if [ -c "${FUSE_DEVICE}" ] ; then
+        echo "Mounting fuse device"      
+        sudo touch "${MOUNTED_PATH}"
+        sudo mount --bind "${FUSE_DEVICE}" "${MOUNTED_PATH}"               
+        INNER_MOD_PATH="$(readlink -f "${FLAGS_chroot}${KERNEL_MODULES_ROOT}")"    
+        if [ ! -f "${INNER_MOD_PATH}/modules.dep" ] ; then
+          sudo mkdir -p "${INNER_MOD_PATH}/kernel/fs/fuse"
+          sudo cp -fu "${KERNEL_MODULES_ROOT}/modules.dep" "${INNER_MOD_PATH}"
+          sudo cp -fu "${KERNEL_MODULES_ROOT}/kernel/fs/fuse/fuse.ko" \
+            "${INNER_MOD_PATH}/kernel/fs/fuse"
+        fi        
+      else
+        echo "Warning:  Fuse device not found.  gmergefs will not work"
+      fi
+    fi                    
+        
   ) 200>>"$LOCKFILE" || die "setup_env failed"
 }
 
 function teardown_env {
   # Only teardown if we're the last enter_chroot to die
   (
     flock 200
 
     # check each pid in $LOCKFILE to see if it's died unexpectedly
     TMP_LOCKFILE="$LOCKFILE.tmp"
@@ skipping 78 matching lines @@
 
 # Run command or interactive shell.  Also include the non-chrooted path to
 # the source trunk for scripts that may need to print it (e.g.
 # build_image.sh).
 sudo chroot "$FLAGS_chroot" sudo -i -u $USER $CHROOT_PASSTHRU \
   EXTERNAL_TRUNK_PATH="${FLAGS_trunk}" LANG=C "$@"
 
 # Remove trap and explicitly unmount
 trap - EXIT
 teardown_env