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path: root/examples/unschroot.py
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2024-06-22unschroot: allow device accessHelmut Grohne
2024-06-22populate_sys: allow device accessHelmut Grohne
The systemd test suite does not like having no access to /sys/dev and other trees related to devices. Optionally provide them. Properly virtualizing them likely requires lxcfs or similar.
2024-06-22unschroot: only provide /dev/net/tun when the network namespace is unsharedHelmut Grohne
2024-06-22unschroot: create an /etc/hosts unless it existsHelmut Grohne
Software has a reasonable assumption that localhost as well as the current hostname resolves to an IP address. Without an /etc/hosts file, this is not the case and makes some builds such as src:ovn fail.
2024-06-22unschroot: add argument --isolate-networkHelmut Grohne
This is where unschroot becomes incompatible with schroot as schroot does not have this option. The idea is that unschroot becomes feature-compatible with sbuild --chroot-mode=unshare and that requires supporting network isolation. To make use of this, sbuild needs to be extended to pass this flag when it sees a "Type unshare" chroot that is not normally exposed from regular schroot.
2024-06-21unschroot: enable opening /dev/stdoutHelmut Grohne
When stdout is an (unnamed) pipe, it usually has permission 0o644. Since we change uids, /dev/stdout cannot be opened unless we chmod it first. This causes some packages such as supervisor to fail to build.
2024-06-11fix formatting and spelling errorsHelmut Grohne
No functional changes.
2024-06-11improve typingHelmut Grohne
linuxnamespaces/__init__.py: * linuxnamespaces.filedescriptor only exports FileDescriptor. By importing *, we re-export it implicitly. linuxnamespaces/atlocation.py: * PathLike should be parameterized and we no longer allow bytes there. linuxnamespaces/tarutils.py: * Resolve dict vs Mapping. tests/test_simple.py: * Establish expected type to mypy. examples/unschroot.py: * pidfd is first an int and later a FileDescriptor, but we always use it as int. * Also tell mypy that we cannot get NULL from waitid.
2024-06-11unschroot: add a pid 1 that reaps zombiesHelmut Grohne
While sbuild --chroot-mode=unshare opted for installing dumb-init, we'll keep the environment minimal and have a dumb-init written in perl-base, which happens to be essential still. Unfortunately, we cannot wait for our target process from our main process as the target process is a child of our perl init. Therefore our perl init must forward the exit code.
2024-06-11unschroot: synchronize reparentingHelmut Grohne
Before this change, it could happen that we'd call prctl_set_child_subreaper before our parent actually died. Thus we'd quickly get the death signal. The additional synchronization point ensures that our previous parent process has been waited for (and thus we are reparented) before installing the death signal.
2024-06-11unschroot: report "Type unshare" for our sessionsHelmut Grohne
Any existing type would be an invalid promise. While sbuild parses the type, it also currently throws its value away and does not base any decisions on it. With the new value, it could recognize unschroot and opt into new features.
2024-06-11unschroot: tweak --info outputHelmut Grohne
* Tag sessions as "Session Purged". This causes sbuild to skip uninstalling build-depends and other cleanup. * Always emit "Aliases" even when empty as we get a warning from sbuild otherwise.
2024-06-11unschroot: fix internal option conflictHelmut Grohne
Fixes: a1cc59818088 ("add example "unschroot.py"")
2024-06-08add example "unschroot.py"Helmut Grohne
While this mostly provides the schroot API and adds its own semantics around ~/.cache/unschroot, please do not consider examples a stable interface but a room for experimentation and incompatible changes.