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What a chroot test environment does
A chroot environment gives a process a different directory as its filesystem root. A command started inside /var/chroot/test sees that directory as /, so its package database, libraries, binaries and configuration files can be kept separate from the host. This is useful for testing package installation, build scripts, release upgrades and software that must run against a particular Ubuntu userspace.
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The kernel is still the host kernel. Processes in a basic chroot are not separated from the host in the way a virtual machine or a namespace container is. A process can still use host kernel interfaces, and anything you bind-mount, copy into the root or expose through a setup script is available inside the test. Do not use plain chroot to run hostile code or to claim security isolation.
Choose plain chroot, schroot or systemd-nspawn
| Characteristic | chroot |
schroot |
systemd-nspawn |
|---|---|---|---|
| What it provides | A direct filesystem-root change for one command or shell. | Named, repeatable chroot sessions with users, groups, mount rules and start/stop scripts. | A lightweight namespace container intended for debugging, testing and building. |
| Setup repeatability | Low unless you maintain your own scripts and mounts. | High: configuration files define the directory, access policy, personality and session behavior. | High when an OS tree and explicit command-line options are kept under version control. |
| Host filesystem exposure | Whatever the process can reach or whatever you mount; there is no policy layer by default. | Controlled through schroot mount configuration and setup scripts, but defaults must be inspected. | Namespace and device options can reduce exposure; review every shared path and device. |
| Process, IPC and namespace isolation | None beyond the changed root directory. | Still a chroot; schroot adds management rather than kernel isolation. | Provides filesystem and process-tree namespace features that are stronger than plain chroot. |
| Boot a complete userspace | No service manager or boot sequence is provided. | No; it starts commands in a chroot session. | Can boot a full Linux userspace from an operating-system tree when the tree and options support it. |
| Cross-architecture testing | The root filesystem can contain another architecture, but programs still need compatible execution support such as emulation. | Uses the same underlying chroot rules; personality can adjust reported process personality, but it does not translate instructions. |
Can use an OS tree for another architecture when the host has the required execution support; verify binfmt or emulation separately. |
| Session and cleanup | You must mount, enter and clean up manually. | Sessions, mount setup and teardown are named and inspectable. | Container lifetime is tied to the nspawn process or its service definition. |
Use direct chroot for a quick, trusted, one-off shell. Use schroot for recurring tests where the same mounts, users and cleanup rules must be applied every time. Choose systemd-nspawn when a test needs process and IPC namespaces, a virtualized process tree or a userspace that can be booted rather than merely entered.
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Prepare the Ubuntu host
Install the bootstrap and session tools
On the Ubuntu host, install the packages that provide the root filesystem bootstrapper and the managed chroot wrapper:
sudo apt update
sudo apt install debootstrap schrootUse an account with sudo access. Creating the root directory, bootstrapping packages and changing ownership or mounts normally require root privileges. Decide in advance which Ubuntu release and architecture the test represents, where the root filesystem will live, which users may enter it and which host paths, if any, must be shared.
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Keep each test root in its own directory so it can be inspected, reset or removed without touching the host root:
sudo install -d -m 0755 /var/chroot/testDo not place test output in a host directory that the environment can write unless that sharing is intentional. A separate output directory, mounted read-only input tree and disposable session make failures easier to reproduce.
Bootstrap the Ubuntu root filesystem with debootstrap
Select the release and architecture
The first positional argument to debootstrap is the Ubuntu release codename. Select the release your software must support, not necessarily the host release. The --arch option selects the target architecture. A different architecture can be unpacked, but binaries still require compatible kernel support or emulation when you execute them.
For a package-building environment, use --variant=buildd. That variant is intended for build roots and produces a different initial package set from the default bootstrap. Add it only when your test is actually modelling a build environment.
Run the bootstrap
Replace the values in angle brackets with the release codename, architecture and Ubuntu mirror appropriate for your environment:
sudo debootstrap
--arch=<target-architecture>
--variant=buildd
<release-codename>
/var/chroot/test
<ubuntu-mirror-url>For a normal runtime test, omit --variant=buildd:
sudo debootstrap
--arch=<target-architecture>
<release-codename>
/var/chroot/test
<ubuntu-mirror-url>During the bootstrap, packages are downloaded and unpacked into the target directory. If the command stops part way through, read the final error before deleting anything; network failures can often be corrected and the command rerun against the same directory. If the target directory contains an unrelated filesystem, stop and choose a new location rather than allowing bootstrap files to mix with it.
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Confirm the result before adding policy
sudo test -x /var/chroot/test/bin/sh
sudo ls -la /var/chroot/test
sudo chroot /var/chroot/test /bin/sh -c 'cat /etc/os-release'The last command should report the release you selected. It does not prove that DNS, locales, device access or package installation are ready; those are separate validation steps.
Define a named schroot environment
Choose the configuration file style
Ubuntu installations may use a central /etc/schroot/schroot.conf file or individual files in /etc/schroot/chroot.d/. Use the style already present on your host. A named entry should state what the environment is, where it lives and who can use it. Keep the configuration in your system configuration management if several machines must create the same test root.
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Write a minimal entry
The following example uses the per-chroot directory style. Save it as a root-owned file such as /etc/schroot/chroot.d/test.conf, or place the same stanza in /etc/schroot/schroot.conf:
[test]
description=Ubuntu test root
directory=/var/chroot/test
users=alice
groups=ubuntu-testers
personality=linuxRemove the leading space before directory if you copy the example; configuration keys should start at the beginning of the line. Replace alice and ubuntu-testers with the account and group that should enter the environment. If only root should use it, omit the ordinary-user entries and use the access controls appropriate to your host policy.
The personality setting is useful when a test expects a particular Linux process personality, but it does not create CPU emulation or kernel isolation. Keep the entry as small as possible: every mount, copied file and permission is part of the test contract.
Inspect mount defaults before the first session
Schroot can apply default mounts and setup scripts when a session starts. Inspect the host’s mount defaults and related configuration before allowing a test to run:
sudo sed -n '1,240p' /etc/schroot/mount-defaults
sudo find /etc/schroot -maxdepth 2 -type f -printUbuntu’s community guidance warns that a default configuration may bind the host’s /home into the chroot. If the test must not see host home directories, disable that bind line or override the mount configuration for this chroot. Check for other shared paths, including temporary directories, build caches, sockets and device trees. A clean-looking root directory does not mean the running session is isolated if a setup script mounts host content into it.
Enter the environment
Use a managed schroot session
Start a shell through the named configuration:
schroot -c testFor a single command, pass the command after the configuration name:
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schroot -c test -- /bin/bash -lc 'command-under-test --version'Schroot applies its session rules and setup or teardown scripts around the command. Record the session name and inspect logs when a mount or copy operation fails. Exit the shell normally when finished so teardown can run.
Use direct chroot when management is unnecessary
sudo chroot /var/chroot/test /bin/bashDirect chroot is useful for checking the root or debugging a bootstrap, but it does not automatically reproduce schroot’s mounts, copied host files or cleanup behavior. If the test depends on those details, use the named schroot entry instead of switching between methods.
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Install the packages and files the test needs
Make the root practical without making it opaque
A newly bootstrapped root can be too bare for ordinary package tests. Ubuntu community guidance suggests installing ubuntu-minimal when the initial environment lacks expected base utilities:
apt update
apt install ubuntu-minimalRun those commands inside the environment. Then install only the test dependencies, pin versions where the test requires them and record the package list. Avoid copying the host’s entire /etc, library directories or home directory into the root; broad copies make failures depend on the host and defeat the purpose of a controlled test.
Decide how DNS and identity data are supplied
Package installation and network tests need a working resolver. Verify what schroot setup scripts do with /etc/resolv.conf, NSS databases and related files. Schroot scripts can copy host files and NSS databases at session start, so those copies are part of the environment’s behavior. If a test is intended to be offline or hermetic, disable those copies and provide explicit fixtures instead.
Generate locales when warnings occur
Locale warnings usually mean the requested locale is not generated in the test root. Check the current setting and available locales:
locale
locale -aInstall the locale package if necessary and generate the locale required by the test. On an Ubuntu root that uses the standard locale tools, the workflow is:
apt install locales
# edit /etc/locale.gen and uncomment the required locale
locale-gen
update-locale LANG=<locale-name>Use the exact locale name required by the application, then open a new session so environment variables and generated data are picked up consistently.
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Validate the environment before running tests
Run a short preflight inside the same kind of session that will execute the suite. A useful checklist is:
- Release:
cat /etc/os-releaseconfirms the target userspace. - Architecture:
uname -manddpkg --print-architectureshow what the kernel and package manager report. - Identity:
idconfirms the effective user and groups. - DNS:
getent hosts archive.ubuntu.comchecks name resolution without assuming a particular resolver utility. - Locales:
localeandlocale -aconfirm the test’s language and encoding. - Mounts:
mountshows whether host home, temporary directories, devices or test data are shared. - Writable paths: create a file in the intended scratch directory and verify that it is not appearing in an unintended host path.
- Test data: check that fixtures are present, inputs are read-only when they should be, and output goes to the designated directory.
Keep the preflight as a script and run it in continuous integration. A test that silently falls back to the host’s home directory or resolver can pass for the wrong reason.
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Control mounts and copied host files
Mounts are the most common source of accidental host exposure. Review /etc/schroot/mount-defaults and any setup scripts before granting access to other users. In particular, look for:
- Host
/homeor a user’s home directory. /tmpand build caches that may contain credentials or unrelated artifacts.- Device, proc, sysfs and run-time mounts.
- Host sockets, including desktop, SSH-agent or container-engine sockets.
- Copied files such as
/etc/passwd,/etc/group, resolver configuration and NSS databases.
Share only what the test needs. A read-only fixture mount is safer than a writable host directory; a dedicated disposable output directory is safer than the host home. If a setup script copies a file at session start, changes made on the host can change test results even though the root filesystem itself is unchanged.
Run tests reproducibly
Separate image creation from test execution
Build the root filesystem in one step, install and configure dependencies in a documented step, then execute tests in a fresh session. This makes it possible to discard a contaminated root and distinguish bootstrap failures from test failures. Save the release codename, architecture, debootstrap options, package manifest, schroot stanza and mount policy with the test definition.
Use disposable state for destructive tests
Tests that alter package databases, system configuration or service state should start from a known root. Keep a pristine copy or rebuild with debootstrap rather than relying on manual cleanup. Do not delete /var/chroot/test while a session is active or while mounts from that session remain attached; exit all shells and stop the managed session first.
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Prefix host operations with sudo and run guest operations only after entering schroot. In automation, invoke the command explicitly with schroot -c test -- so a failed entry cannot accidentally run the test on the host.
Troubleshoot common failures
“Command not found” immediately after bootstrap
The root may contain only the bootstrap’s minimal set. Enter it, run apt update, install ubuntu-minimal and then install the test’s declared dependencies. If apt update itself fails, troubleshoot DNS, routes, resolver configuration and architecture before adding unrelated packages.
DNS works on the host but not in schroot
Inspect /etc/resolv.conf inside the session and compare it with the mount and setup rules. Confirm that the resolver file is intentionally copied or mounted, then test with getent hosts. For an offline test, remove the dependency on live DNS and provide a local package cache or fixture instead of exposing the host resolver.
Locale warnings appear in every command
Check locale -a, install locales, uncomment the required locale in /etc/locale.gen, run locale-gen and set the environment with update-locale. Start a new session after generation.
Host files are visible unexpectedly
Run mount inside the session and inspect /etc/schroot/mount-defaults plus every setup script. Disable the host-home bind and remove unnecessary copied files. Re-test with a deliberately empty test account and a marker file outside the designated shared paths.
An alternate architecture fails with “Exec format error”
--arch controls what debootstrap installs; it does not translate instructions. Confirm the target architecture with dpkg --print-architecture, then provide the host kernel’s required emulation or use a host capable of executing that architecture. Do not treat a successfully unpacked root as proof that its binaries can run.
A schroot session will not cleanly end
Exit every shell started from the session, identify processes that still have files or working directories under the root, and allow schroot’s stop scripts to run. Inspect mounts before removing the directory. If a test launches a background process, make the test terminate it explicitly; otherwise teardown can remain blocked or leave host resources attached.
When systemd-nspawn is the better choice
Ubuntu documents systemd-nspawn as a lightweight namespace container for debugging, testing and building. Unlike a plain chroot, it can virtualize the filesystem hierarchy and process tree and can boot a full Linux userspace from an operating-system tree. That makes it a better fit for tests that start multiple processes, exercise IPC behavior, expect a service manager or need stronger separation from the host than a filesystem-root change provides.
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sudo systemd-nspawn -D /var/chroot/testUse the nspawn options appropriate to the mounts, networking, users and boot mode your test requires. Keep those options explicit and review shared directories just as you review schroot mounts. A namespace container still depends on the host kernel and is not a substitute for a virtual machine when you need a different kernel or a hard security boundary.
Do not switch to nspawn merely because a chroot command is inconvenient. If the test only needs a separate package database and filesystem tree, schroot is simpler and its configuration is easier to audit. Switch when process-tree behavior, namespace isolation or booting the userspace is a requirement.
Security and repeatability checklist
- Run untrusted code in a stronger isolation mechanism than plain chroot; chroot is not a complete security boundary.
- Review
/etc/schroot/mount-defaultsand all setup scripts before the first test and after package or configuration changes. - Disable host-home binding unless the test explicitly needs it.
- Limit users and groups in the schroot stanza.
- Share dedicated fixture and output paths rather than a personal home directory.
- Record debootstrap release, architecture, variant and mirror choices.
- Record installed packages, locale settings, resolver behavior and mount policy.
- Run a preflight for release, architecture, identity, DNS, locales, mounts and test data.
- Use fresh or reset roots for destructive tests.
- End sessions and verify mounts are gone before deleting a root.
A practical decision
For most Ubuntu package and integration tests, bootstrap the target release with debootstrap, define a minimal named schroot entry, inspect its mounts, install ubuntu-minimal and the declared dependencies, then run a preflight before the suite. Use direct chroot only for quick trusted maintenance. If the test needs a virtualized process tree, IPC and filesystem namespaces, or a bootable userspace, use systemd-nspawn and document its sharing options.
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