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127 lines
3.8 KiB
Bash
Executable File
127 lines
3.8 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Script to enter the chroot environment
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# Load common constants. This should be the first executable line.
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# The path to common.sh should be relative to your script's location.
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. "$(dirname "$0")/common.sh"
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# Script must be run outside the chroot
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assert_outside_chroot
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# Define command line flags
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# See http://code.google.com/p/shflags/wiki/Documentation10x
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DEFINE_string chroot "$DEFAULT_CHROOT_DIR" \
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"The destination dir for the chroot environment." "d"
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DEFINE_string trunk "$GCLIENT_ROOT" \
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"The source trunk to bind mount within the chroot." "s"
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DEFINE_boolean mount $FLAGS_FALSE "Only set up mounts."
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DEFINE_boolean unmount $FLAGS_FALSE "Only tear down mounts."
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DEFINE_boolean svn_rev $FLAGS_FALSE "Pass subversion revision into chroot."
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# More useful help
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FLAGS_HELP="USAGE: $0 [flags] [VAR=value] [-- \"command\"]
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One or more VAR=value pairs can be specified to export variables into
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the chroot environment. For example:
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$0 FOO=bar BAZ=bel
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If [-- \"command\"] is present, runs the command inside the chroot,
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after changing directory to /$USER/trunk/src/scripts. Note that the
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command should be enclosed in quotes to prevent interpretation by the
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shell before getting into the chroot. For example:
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$0 -- \"./build_platform_packages.sh\"
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Otherwise, provides an interactive shell.
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"
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# Parse command line flags
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FLAGS "$@" || exit 1
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eval set -- "${FLAGS_ARGV}"
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# Only now can we die on error. shflags functions leak non-zero error codes,
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# so will die prematurely if 'set -e' is specified before now.
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# TODO: replace shflags with something less error-prone, or contribute a fix.
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set -e
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function setup_env {
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echo "Mounting chroot environment."
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# Mount only if not already mounted
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MOUNTED_PATH="$(readlink -f "$FLAGS_chroot/proc")"
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if [ -z "$(mount | grep -F "on $MOUNTED_PATH")" ]
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then
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sudo mount none -t proc "$MOUNTED_PATH"
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fi
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MOUNTED_PATH="$(readlink -f "$FLAGS_chroot/dev/pts")"
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if [ -z "$(mount | grep -F "on $MOUNTED_PATH")" ]
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then
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sudo mount none -t devpts "$MOUNTED_PATH"
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fi
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MOUNTED_PATH="$(readlink -f "${FLAGS_chroot}$CHROOT_TRUNK_DIR")"
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if [ -z "$(mount | grep -F "on $MOUNTED_PATH")" ]
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then
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sudo mount --bind "$FLAGS_trunk" "$MOUNTED_PATH"
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fi
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}
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function teardown_env {
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echo "Unmounting chroot environment."
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mount | grep "on $(readlink -f "$FLAGS_chroot")" | awk '{print $3}' \
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| xargs -r -L1 sudo umount
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}
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if [ $FLAGS_mount -eq $FLAGS_TRUE ]
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then
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setup_env
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echo "Make sure you run"
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echo " $0 --unmount"
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echo "before deleting $FLAGS_chroot"
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echo "or you'll end up deleting $FLAGS_trunk too!"
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exit 0
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fi
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if [ $FLAGS_unmount -eq $FLAGS_TRUE ]
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then
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teardown_env
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exit 0
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fi
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# Make sure we unmount before exiting
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trap teardown_env EXIT
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setup_env
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if [ $FLAGS_svn_rev -eq $FLAGS_TRUE ]
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then
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# Get the subversion revision to pass into the chroot.
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#
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# This must be determined outside the chroot because (1) there is no
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# svn inside the chroot, and (2) if there were it would likely be
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# the wrong version, which would mess up the .svn directories.
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#
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# Note that this fixes $CHROMEOS_REVISION at the time the chroot is
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# entered. That's ok for the main use case of automated builds,
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# which pass each command line into a separate call to enter_chroot
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# so always have up-to-date info. For developer builds, there isn't
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# really a single revision anyway, since the developer may have
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# hand-sync'd some subdirs and edited files in others.
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SVNREV="CHROMEOS_REVISION=$(svn info | grep "Revision: " | awk '{print $2}')"
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fi
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# Run command or interactive shell
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sudo chroot "$FLAGS_chroot" sudo -i -u $USER $SVNREV "$@"
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# Remove trap and explicitly unmount
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trap - EXIT
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teardown_env
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