How to use host os directory from chroot (mock) environment.
On Fedora Project's work, a chroot environment is usually used to build and test. The environment is called "mock" environment.
As I often forget the way, I save it to this page.
There are 2 ways.
1. Using mount --bind
Use below command.
$ mount --bind <old_dir> <new_dir>
The /path/to/root/mnt directory is /mnt in the mock (chroot) environment.
Create a directory to mount a directory.
$ sudo mkdir /var/lib/mock/fedora-rawhide-x86_64/root/mnt/foo
Mounting the directory, it can be referred in the mock (chroot) environment.
$ cd /path/to/foo $ sudo mount --bind . /var/lib/mock/fedora-rawhide-x86_64/mnt/foo
2. Using mock's mount plugin
2nd way is limited to the mock command. But it's easier way.
The document is here [1].
You can set it for example in $HOME/.config/mock.cfg.
This directory is auto-mounted when doing login to the mock environment.
config_opts['plugin_conf']['bind_mount_enable'] = True config_opts['plugin_conf']['bind_mount_opts']['dirs'].append(('/host_os/path/to/foo', '/mnt/foo' ))
That's all.
References
Travis CI: A better alternative of travis_wait to output the command stdout
I found a better way to run heavy command, seeing a code [1] by chance.
If the command does not output log to stdout or stderr for 10 minutes, the job stops. The popular practice to prevent it is like this. But the problem is this command does not output while processing the command.
.travis.yml
script: - travis_wait 40 heavy_command
And below is a better way.
script:
# Ping stdout every 9 minutes or Travis kills build,
# while travis_wait does not show the command output while processing.
# https://docs.travis-ci.com/user/common-build-problems/#build-times-out-because-no-output-was-received
- |
while sleep 9m; do
echo "====[ $SECONDS seconds still running ]===="
done &
- heavy_command
$SECONDS shows the processing running time. It seems that is reserved environment variable by Travis CI.
