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RFC tmpfiles: Allow configuration to ignore execution errors

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This is an implementation that covers making errors encountered when writing
file content optionally fatal. If this is something that folks would want I'll
add handling of this for all the other directives. I'd appreciate suggestions
on how this might better be structured as well (use of a goto fail or such) as
I'm not super happy with the approach.
This commit is contained in:
William Douglas 2018-09-10 12:07:29 -07:00 committed by Lennart Poettering
parent 97c7469bbe
commit 6d7b543342
2 changed files with 19 additions and 2 deletions
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11
man/tmpfiles.d.xml
View File

@ -116,7 +116,7 @@ L /tmp/foobar - - - - /dev/null</programlisting>
<title>Type</title>
<para>The type consists of a single letter and optionally an
exclamation mark.</para>
exclamation mark and/or minus sign.</para>
<para>The following line types are understood:</para>
@ -439,6 +439,15 @@ r! /tmp/.X[0-9]*-lock</programlisting>
running system, and will only be executed with
<option>--boot</option>.</para>
<para>If the minus sign is used, this line failing to run
successfully during create (and only create) will not cause
the execution of <command>systemd-tmpfiles</command> to return
an error.</para>
<para>For example:
<programlisting># Modify sysfs but don't fail if we are in a container with a read-only /proc
w- /proc/sys/vm/swappiness - - - - 10</programlisting></para>
<para>Note that for all line types that result in creation of any kind of file node
(i.e. <varname>f</varname>/<varname>F</varname>,
<varname>d</varname>/<varname>D</varname>/<varname>v</varname>/<varname>q</varname>/<varname>Q</varname>,

10
src/tmpfiles/tmpfiles.c
View File

@ -128,6 +128,8 @@ typedef struct Item {
bool force:1;
bool allow_failure:1;
bool done:1;
} Item;
@ -2271,6 +2273,9 @@ static int process_item(Item *i) {
r = arg_create ? create_item(i) : 0;
q = arg_remove ? remove_item(i) : 0;
p = arg_clean ? clean_item(i) : 0;
/* Failure can only be tolerated for create */
if (i->allow_failure)
r = 0;
return t < 0 ? t :
r < 0 ? r :
@ -2474,7 +2479,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer, bool
ItemArray *existing;
OrderedHashmap *h;
int r, pos;
bool force = false, boot = false;
bool force = false, boot = false, allow_failure = false;
assert(fname);
assert(line >= 1);
@ -2519,6 +2524,8 @@ static int parse_line(const char *fname, unsigned line, const char *buffer, bool
boot = true;
else if (action[pos] == '+' && !force)
force = true;
else if (action[pos] == '-' && !allow_failure)
allow_failure = true;
else {
*invalid_config = true;
log_error("[%s:%u] Unknown modifiers in command '%s'",
@ -2535,6 +2542,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer, bool
i.type = action[0];
i.force = force;
i.allow_failure = allow_failure;
r = specifier_printf(path, specifier_table, NULL, &i.path);
if (r == -ENXIO)