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fstab-generator: Options= applies specifier expansion

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Let's document that this is the case, and properly escape % when we
generate Options= in the generator.

Fixes: #5086
This commit is contained in:
Lennart Poettering 2017-02-07 13:08:56 +01:00
parent b53ede699c
commit d5cc4be28f
3 changed files with 30 additions and 12 deletions
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6
man/systemd.mount.xml
View File

@ -366,9 +366,9 @@
<varlistentry>
<term><varname>Options=</varname></term>
<listitem><para>Mount options to use when mounting. This takes
a comma-separated list of options. This setting is
optional.</para></listitem>
<listitem><para>Mount options to use when mounting. This takes a comma-separated list of options. This setting
is optional. Note that the usual specifier expansion is applied to this setting, literal percent characters
should hence be written as <literal>%%</literal>.</para></listitem>
</varlistentry>
<varlistentry>

9
man/systemd.swap.xml
View File

@ -195,12 +195,11 @@
<varlistentry>
<term><varname>Options=</varname></term>
<listitem><para>May contain an option string for the swap
device. This may be used for controlling discard options among
other functionality, if the swap backing device supports the
discard or trim operation. (See
<listitem><para>May contain an option string for the swap device. This may be used for controlling discard
options among other functionality, if the swap backing device supports the discard or trim operation. (See
<citerefentry project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
for more information.) </para></listitem>
for more information.) Note that the usual specifier expansion is applied to this setting, literal percent
characters should hence be written as <literal>%%</literal>.</para></listitem>
</varlistentry>
<varlistentry>

27
src/fstab-generator/fstab-generator.c
View File

@ -57,6 +57,23 @@ static char *arg_usr_fstype = NULL;
static char *arg_usr_options = NULL;
static VolatileMode arg_volatile_mode = _VOLATILE_MODE_INVALID;
static int write_options(FILE *f, const char *options) {
_cleanup_free_ char *o = NULL;
if (isempty(options))
return 0;
if (streq(options, "defaults"))
return 0;
o = strreplace(options, "%", "%%");
if (!o)
return log_oom();
fprintf(f, "Options=%s\n", o);
return 1;
}
static int add_swap(
const char *what,
struct mntent *me,
@ -105,8 +122,9 @@ static int add_swap(
"What=%s\n",
what);
if (!isempty(me->mnt_opts) && !streq(me->mnt_opts, "defaults"))
fprintf(f, "Options=%s\n", me->mnt_opts);
r = write_options(f, me->mnt_opts);
if (r < 0)
return r;
r = fflush_and_check(f);
if (r < 0)
@ -347,8 +365,9 @@ static int add_mount(
if (r < 0)
return r;
if (!isempty(filtered) && !streq(filtered, "defaults"))
fprintf(f, "Options=%s\n", filtered);
r = write_options(f, filtered);
if (r < 0)
return r;
r = fflush_and_check(f);
if (r < 0)