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fstab-generator: disable default deps if x-systemd.{wanted,required}-by= is used
Fixes #30273
This commit is contained in:
Mike Yuan
parent
d3a7602d83
commit
39a4c452d2
@ -134,15 +134,17 @@
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<listitem><para>Mount units referring to local file systems automatically gain
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an <varname>After=</varname> dependency on <filename>local-fs-pre.target</filename>, and a
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<varname>Before=</varname> dependency on <filename>local-fs.target</filename> unless
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<option>nofail</option> mount option is set.</para></listitem>
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<varname>Before=</varname> dependency on <filename>local-fs.target</filename> unless one or more
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mount options among <option>nofail</option>, <option>x-systemd.wanted-by=</option>,
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and <option>x-systemd.required-by=</option> is set. See below for detailed information.
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</para></listitem>
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<listitem><para>Network mount units
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automatically acquire <varname>After=</varname> dependencies on <filename>remote-fs-pre.target</filename>,
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<filename>network.target</filename> and <filename>network-online.target</filename>, and gain a
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<varname>Before=</varname> dependency on <filename>remote-fs.target</filename> unless
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<option>nofail</option> mount option is set. Towards the latter a
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<varname>Wants=</varname> unit is added as well.</para></listitem>
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<listitem><para>Network mount units automatically acquire <varname>After=</varname> dependencies on
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<filename>remote-fs-pre.target</filename>, <filename>network.target</filename>,
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plus <varname>After=</varname> and <varname>Wants=</varname> dependencies on <filename>network-online.target</filename>,
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and a <varname>Before=</varname> dependency on <filename>remote-fs.target</filename>, unless
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one or more mount options among <option>nofail</option>, <option>x-systemd.wanted-by=</option>,
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and <option>x-systemd.required-by=</option> is set.</para></listitem>
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</itemizedlist>
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<para>Mount units referring to local and network file systems are distinguished by their file system type
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@ -240,13 +242,13 @@
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<term><option>x-systemd.wanted-by=</option></term>
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<term><option>x-systemd.required-by=</option></term>
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<listitem><para>In the created mount unit, configures a
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<varname>WantedBy=</varname> or <varname>RequiredBy=</varname>
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dependency on another unit. This option may be
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specified more than once. If this is specified, the normal
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automatic dependencies on the created mount unit, e.g.,
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<filename>local-fs.target</filename>, are not automatically
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created. See <varname>WantedBy=</varname> and <varname>RequiredBy=</varname> in
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<listitem><para>In the created mount unit, configures a <varname>WantedBy=</varname> or
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<varname>RequiredBy=</varname> dependency on another unit. This option may be specified more than once.
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If this is specified, the default dependencies (see above) other than <filename>umount.target</filename>
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on the created mount unit, e.g. <filename>local-fs.target</filename>, are not automatically created.
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Hence it is likely that some ordering dependencies need to be set up manually through
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<option>x-systemd.before=</option> and <option>x-systemd.after=</option>. See <varname>WantedBy=</varname>
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and <varname>RequiredBy=</varname> in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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@ -599,13 +599,25 @@ static int add_mount(
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SET_FLAG(flags, MOUNT_NOFAIL, true);
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}
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if (!strv_isempty(wanted_by) || !strv_isempty(required_by)) {
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/* If x-systemd.{wanted,required}-by= is specified, target_unit is not used */
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target_unit = NULL;
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/* Don't set default ordering dependencies on local-fs.target or remote-fs.target, but we
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* still need to conflict with umount.target. */
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fputs("DefaultDependencies=no\n"
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"Conflicts=umount.target\n"
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"Before=umount.target\n",
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f);
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}
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r = write_extra_dependencies(f, opts);
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if (r < 0)
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return r;
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/* Order the mount unit we generate relative to target_unit, so that DefaultDependencies= on the
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* target unit won't affect us. */
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if (!FLAGS_SET(flags, MOUNT_NOFAIL))
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if (target_unit && !FLAGS_SET(flags, MOUNT_NOFAIL))
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fprintf(f, "Before=%s\n", target_unit);
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if (passno != 0) {
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@ -696,26 +708,7 @@ static int add_mount(
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}
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}
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if (!FLAGS_SET(flags, MOUNT_AUTOMOUNT)) {
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if (!FLAGS_SET(flags, MOUNT_NOAUTO) && strv_isempty(wanted_by) && strv_isempty(required_by)) {
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r = generator_add_symlink(dest, target_unit,
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(flags & MOUNT_NOFAIL) ? "wants" : "requires", name);
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if (r < 0)
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return r;
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} else {
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STRV_FOREACH(s, wanted_by) {
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r = generator_add_symlink(dest, *s, "wants", name);
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if (r < 0)
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return r;
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}
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STRV_FOREACH(s, required_by) {
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r = generator_add_symlink(dest, *s, "requires", name);
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if (r < 0)
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return r;
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}
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}
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} else {
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if (FLAGS_SET(flags, MOUNT_AUTOMOUNT)) {
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r = unit_name_from_path(where, ".automount", &automount_name);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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@ -745,11 +738,37 @@ static int add_mount(
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r = fflush_and_check(f);
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if (r < 0)
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return log_error_errno(r, "Failed to write unit file %s: %m", automount_name);
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}
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r = generator_add_symlink(dest, target_unit,
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(flags & MOUNT_NOFAIL) ? "wants" : "requires", automount_name);
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if (r < 0)
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return r;
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if (target_unit) {
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assert(strv_isempty(wanted_by));
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assert(strv_isempty(required_by));
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/* noauto has no effect if x-systemd.automount is used */
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if (!FLAGS_SET(flags, MOUNT_NOAUTO) || automount_name) {
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r = generator_add_symlink(dest, target_unit,
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FLAGS_SET(flags, MOUNT_NOFAIL) ? "wants" : "requires",
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automount_name ?: name);
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if (r < 0)
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return r;
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}
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} else {
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const char *unit_name = automount_name ?: name;
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STRV_FOREACH(s, wanted_by) {
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r = generator_add_symlink(dest, *s, "wants", unit_name);
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if (r < 0)
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return r;
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}
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STRV_FOREACH(s, required_by) {
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r = generator_add_symlink(dest, *s, "requires", unit_name);
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if (r < 0)
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return r;
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}
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if ((flags & (MOUNT_NOAUTO|MOUNT_NOFAIL)) != 0)
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log_warning("x-systemd.wanted-by= and/or x-systemd.required-by= specified, 'noauto' and 'nofail' have no effect.");
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}
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return true;
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@ -0,0 +1 @@
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../mnt-wantedby-automount.automount
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@ -3,7 +3,9 @@
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[Unit]
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Documentation=man:fstab(5) man:systemd-fstab-generator(8)
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SourcePath=/etc/fstab
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Before=local-fs.target
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DefaultDependencies=no
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Conflicts=umount.target
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Before=umount.target
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After=blockdev@dev-sdx8.target
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[Mount]
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@ -0,0 +1,8 @@
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# Automatically generated by systemd-fstab-generator
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[Unit]
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SourcePath=/etc/fstab
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Documentation=man:fstab(5) man:systemd-fstab-generator(8)
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[Automount]
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Where=/mnt/wantedby-automount
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@ -0,0 +1,14 @@
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# Automatically generated by systemd-fstab-generator
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[Unit]
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Documentation=man:fstab(5) man:systemd-fstab-generator(8)
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SourcePath=/etc/fstab
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DefaultDependencies=no
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Conflicts=umount.target
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Before=umount.target
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After=blockdev@dev-sdx17.target
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[Mount]
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What=/dev/sdx17
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Where=/mnt/wantedby
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Options=x-systemd.wanted-by=foo.service,x-systemd.automount
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@ -3,7 +3,9 @@
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[Unit]
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Documentation=man:fstab(5) man:systemd-fstab-generator(8)
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SourcePath=/etc/fstab
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Before=local-fs.target
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DefaultDependencies=no
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Conflicts=umount.target
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Before=umount.target
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After=blockdev@dev-sdx7.target
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[Mount]
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@ -0,0 +1 @@
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../mnt-wantedby-automount.automount
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@ -3,7 +3,9 @@
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[Unit]
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Documentation=man:fstab(5) man:systemd-fstab-generator(8)
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SourcePath=/etc/fstab
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Before=local-fs.target
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DefaultDependencies=no
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Conflicts=umount.target
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Before=umount.target
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After=blockdev@dev-sdx8.target
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[Mount]
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@ -0,0 +1,8 @@
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# Automatically generated by systemd-fstab-generator
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[Unit]
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SourcePath=/etc/fstab
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Documentation=man:fstab(5) man:systemd-fstab-generator(8)
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[Automount]
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Where=/mnt/wantedby-automount
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@ -0,0 +1,14 @@
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# Automatically generated by systemd-fstab-generator
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[Unit]
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Documentation=man:fstab(5) man:systemd-fstab-generator(8)
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SourcePath=/etc/fstab
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DefaultDependencies=no
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Conflicts=umount.target
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Before=umount.target
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After=blockdev@dev-sdx17.target
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[Mount]
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What=/dev/sdx17
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Where=/mnt/wantedby
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Options=x-systemd.wanted-by=foo.service,x-systemd.automount
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@ -3,7 +3,9 @@
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[Unit]
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Documentation=man:fstab(5) man:systemd-fstab-generator(8)
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SourcePath=/etc/fstab
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Before=local-fs.target
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DefaultDependencies=no
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Conflicts=umount.target
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Before=umount.target
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After=blockdev@dev-sdx7.target
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[Mount]
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@ -1,16 +1,17 @@
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/dev/sdx1 /sysroot auto defaults 0 1
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/dev/sdx2 /mnt/timeout auto x-systemd.mount-timeout=10m 0 0
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/dev/sdx3 /mnt/after auto x-systemd.after=foo.service 0 0
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/dev/sdx4 /mnt/before auto x-systemd.before=foo.service 0 0
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/dev/sdx5 /mnt/requires auto x-systemd.requires=foo.service 0 0
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/dev/sdx6 /mnt/reqmounts auto x-systemd.requires-mounts-for=/hoge 0 0
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/dev/sdx7 /mnt/wantedby auto x-systemd.wanted-by=foo.service 0 0
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/dev/sdx8 /mnt/requiredby auto x-systemd.required-by=foo.service 0 0
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/dev/sdx9 /mnt/automount1 auto x-systemd.automount,x-systemd.idle-timeout=30m 0 0
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/dev/sdx10 /mnt/automount2 auto x-systemd.automount,nofail 0 0
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/dev/sdx11 /mnt/rwonly auto x-systemd.rw-only 0 0
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/dev/sdx12 /mnt/mkfs ext4 x-systemd.makefs 0 0
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/dev/sdx13 /mnt/growfs auto x-systemd.growfs 0 0
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/dev/sdx14 /mnt/pcrfs auto x-systemd.pcrfs 0 0
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/dev/sdx15 /mnt/noauto auto noauto 0 0
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/dev/sdx16 /mnt/nofail auto nofail 0 0
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/dev/sdx1 /sysroot auto defaults 0 1
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/dev/sdx2 /mnt/timeout auto x-systemd.mount-timeout=10m 0 0
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/dev/sdx3 /mnt/after auto x-systemd.after=foo.service 0 0
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/dev/sdx4 /mnt/before auto x-systemd.before=foo.service 0 0
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/dev/sdx5 /mnt/requires auto x-systemd.requires=foo.service 0 0
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/dev/sdx6 /mnt/reqmounts auto x-systemd.requires-mounts-for=/hoge 0 0
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/dev/sdx7 /mnt/wantedby auto x-systemd.wanted-by=foo.service 0 0
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/dev/sdx8 /mnt/requiredby auto x-systemd.required-by=foo.service 0 0
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/dev/sdx9 /mnt/automount1 auto x-systemd.automount,x-systemd.idle-timeout=30m 0 0
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/dev/sdx10 /mnt/automount2 auto x-systemd.automount,nofail 0 0
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/dev/sdx11 /mnt/rwonly auto x-systemd.rw-only 0 0
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/dev/sdx12 /mnt/mkfs ext4 x-systemd.makefs 0 0
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/dev/sdx13 /mnt/growfs auto x-systemd.growfs 0 0
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/dev/sdx14 /mnt/pcrfs auto x-systemd.pcrfs 0 0
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/dev/sdx15 /mnt/noauto auto noauto 0 0
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/dev/sdx16 /mnt/nofail auto nofail 0 0
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/dev/sdx17 /mnt/wantedby-automount auto x-systemd.wanted-by=foo.service,x-systemd.automount 0 0
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