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76764885b9
sudo takes 150ms per invocation on Goobuntu, and with 10 invocations in
enter_chroot.sh, this means that we're wasting a lot of time, every time
cros_sdk is invoked. Cutting these unnecessary invocations reduces the time
required to run enter_chroot.sh from 2.3s to 0.8s.
CL:36618 is the companion change that updates cros_sdk to invoke
sudo unshare -m prior to calling enter_chroot.sh.
Summary of changes:
1. Remove all calls to sudo and just run the commands directly.
- Remove the mount queue and any sudo_multi optimizations.
- Rename sudo_chroot -> bare_chroot because we don't run sudo anymore there.
- Remove code for validating sudo timestamp.
2. Allow the scripts to work as root:
- Ensure that files created by cros_sdk that previously were owned by the
user still are owned by the user (either using chown or cp -p).
- Use $SUDO_USER to find the user's account.
- Use $SUDO_HOME instead of $HOME to find the user's home dir.
- Remove outdated code for disabling automount on Lucid, which doesn't work
when run as root.
- Update code for calculating the user's git username to use sudo to switch
to the user. Also move it to make_chroot.sh so that this change doesn't
impact performance.
3. Cleanup
- Remove environment syncer process in favor of just syncing once when chroot
is entered.
- Remove teardown and instead rely on unshare to unmount the mounts. To make
sure that outside processes never notice the mounts, we use mount -n. This
also ensures that /etc/mtab never contains stale mounts.
- Remove path-overrides, since it is no longer needed.
BUG=chromium-os:35714, chromium-os:35679
TEST=Trybot runs.
CQ-DEPEND=CL:36618
Change-Id: I919a8aadb08fafde97348e8511573c28fdd47186
Reviewed-on: https://gerrit.chromium.org/gerrit/36619
Tested-by: David James <davidjames@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Ready: David James <davidjames@chromium.org>