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cros_sdk: optimize fuse loading

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Running `sudo` at all is a bit poky, so let's avoid modprobing fuse when
we know it already exists because it's listed in /proc/filesystems.

The relative speed:
 time sudo modprobe fuse -> 0.164s
 time grep -q fuse /proc/filesystems -> 0.002s

BUG=None
TEST=enable `set -x`; run `sudo modprobe fuse`; run `cros_sdk true`; see modprobe skipped

Change-Id: I07213e7b0607ca65df2a8a3ae22eb4a49c8bb888
Reviewed-on: http://gerrit.chromium.org/gerrit/7824
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
This commit is contained in:
Mike Frysinger 2011-09-15 18:06:25 -04:00 committed by chrome-bot
parent da7be781c0
commit acc4c9b3fc
1 changed files with 3 additions and 2 deletions
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5
sdk_lib/enter_chroot.sh
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@ -273,8 +273,9 @@ function setup_env {
fi
fi
# Install fuse module.
if [ -c "${FUSE_DEVICE}" ]; then
# Install fuse module. Skip modprobe when possible for slight
# speed increase when initializing the env.
if [ -c "${FUSE_DEVICE}" ] && ! grep -q fuse /proc/filesystems; then
sudo modprobe fuse 2> /dev/null ||\
warn "-- Note: modprobe fuse failed. gmergefs will not work"
fi