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tmpfiles: insist on at least one configuration file being specified on --purge

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Also, extend the man page explanation substantially, matching more
closely what --create says.

Fixes: #33349
This commit is contained in:
Lennart Poettering 2024-06-18 09:55:20 +02:00 committed by Luca Boccassi
parent edeceb80a9
commit 41064a3c97
2 changed files with 24 additions and 6 deletions
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26
man/systemd-tmpfiles.xml
View file

@ -151,12 +151,26 @@
<varlistentry>
<term><option>--purge</option></term>
<listitem><para>If this option is passed, all files and directories created by a
<filename>tmpfiles.d/</filename> entry will be deleted. Keep in mind that by default,
<filename>/home</filename> is created by <command>systemd-tmpfiles</command>
(see <filename>/usr/lib/tmpfiles.d/home.conf</filename>). Therefore it is recommended
to first run <command>systemd-tmpfiles --dry-run --purge</command> to be certain which files
and directories will be deleted.</para>
<listitem><para>If this option is passed, all files and directories marked for
<emphasis>creation</emphasis> by the <filename>tmpfiles.d/</filename> files specified on the command
line will be <emphasis>deleted</emphasis>. Specifically, this acts on all files and directories
marked with <varname>f</varname>, <varname>F</varname>, <varname>d</varname>, <varname>D</varname>,
<varname>v</varname>, <varname>q</varname>, <varname>Q</varname>, <varname>p</varname>,
<varname>L</varname>, <varname>c</varname>, <varname>b</varname>, <varname>C</varname>,
<varname>w</varname>, <varname>e</varname>. If this switch is used at least one
<filename>tmpfiles.d/</filename> file (or <filename>-</filename> for standard input) must be
specified on the command line or the invocation will be refused, for safety reasons (as otherwise
much of the installed system files might be removed).</para>
<para>The primary usecase for this option is to automatically remove files and directories that
originally have been created on behalf of an installed packaged at package removal time.</para>
<para>It is recommended to first run this command in combination with <option>--dry-run</option>
(see below) to verify which files and directories will be deleted.</para>
<para><emphasis>Warning!</emphasis> This is is usually not the command you want! In most cases
<option>--remove</option> is what you are looking for.</para>
<xi:include href="version-info.xml" xpointer="v256"/></listitem>
</varlistentry>

4
src/tmpfiles/tmpfiles.c
View file

@ -4344,6 +4344,10 @@ static int parse_argv(int argc, char *argv[]) {
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"You need to specify at least one of --clean, --create, --remove, or --purge.");
if (FLAGS_SET(arg_operation, OPERATION_PURGE) && optind >= argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Refusing --purge without specification of a configuration file.");
if (arg_replace && arg_cat_flags != CAT_CONFIG_OFF)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Option --replace= is not supported with --cat-config/--tldr.");