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nspawn: permit --ephemeral with --link-journal=try-* (treat as =no)

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Common sense says that to "try" something means "to not fail if
something turns out not to be possible", thus do not make this
combination a hard error.

The actual implementation ignores any --link-journal= setting when
--ephemeral is in effect, so the semantics are upheld.
This commit is contained in:
Ivan Shapovalov 2024-01-20 12:52:28 +01:00 committed by Yu Watanabe
parent 85686b37b0
commit 00fcd79e65
2 changed files with 6 additions and 3 deletions
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3
man/systemd-nspawn.xml
View file

@ -1439,7 +1439,8 @@ After=sys-subsystem-net-devices-ens1.device</programlisting>
and the subdirectory is symlinked into the host at the same
location. <literal>try-host</literal> and
<literal>try-guest</literal> do the same but do not fail if
the host does not have persistent journaling enabled. If
the host does not have persistent journaling enabled, or if
the container is in the <option>--ephemeral</option> mode. If
<literal>auto</literal> (the default), and the right
subdirectory of <filename>/var/log/journal</filename> exists,
it will be bind mounted into the container. If the

6
src/nspawn/nspawn.c
View file

@ -1728,8 +1728,10 @@ static int verify_arguments(void) {
if (arg_ephemeral && arg_template)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --template= may not be combined.");
if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --link-journal= may not be combined.");
/* Permit --ephemeral with --link-journal=try-* to satisfy principle of the least astonishment
* (by common sense, "try" means "do not fail if not possible") */
if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO) && !arg_link_journal_try)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--ephemeral and --link-journal={host,guest} may not be combined.");
if (arg_userns_mode != USER_NAMESPACE_NO && !userns_supported())
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "--private-users= is not supported, kernel compiled without user namespace support.");