units: replace remote-cryptsetup-pre.target with remote-fs-pre.target

remote-cryptsetup-pre.target was designed as an active unit (that pulls in
network-online.target), the opposite of remote-fs-pre.target (a passive unit,
with individual provider services ordering itself before it and pulling it in,
for example iscsi.service and nfs-client.target).

To make remote-cryptsetup-pre.target really work, those services should be
ordered before it too. But this would require updates to all those services,
not just changes from systemd side.

But the requirements for remote-fs-pre.target and remote-cryptset-pre.target
are fairly similar (e.g. iscsi devices can certainly be used for both), so
let's reuse remote-fs-pre.target also for remote cryptsetup units. This loses
a bit of flexibility, but does away with the requirement for various provider
services to know about remote-cryptsetup-pre.target.

man/crypttab.xml

@@ -198,7 +198,7 @@
         started after the network is available, similarly to
         <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
         units marked with <option>_netdev</option>. The service unit to set up this device
-        will be ordered between <filename>remote-cryptsetup-pre.target</filename> and
+        will be ordered between <filename>remote-fs-pre.target</filename> and
         <filename>remote-cryptsetup.target</filename>, instead of
         <filename>cryptsetup-pre.target</filename> and
         <filename>cryptsetup.target</filename>.</para></listitem>

man/systemd.special.xml

@@ -81,7 +81,6 @@
     <filename>poweroff.target</filename>,
     <filename>printer.target</filename>,
     <filename>reboot.target</filename>,
-    <filename>remote-cryptsetup-pre.target</filename>,
     <filename>remote-cryptsetup.target</filename>,
     <filename>remote-fs-pre.target</filename>,
     <filename>remote-fs.target</filename>,
@@ -494,18 +493,6 @@
           this target unit, for compatibility with SysV.</para>
         </listitem>
       </varlistentry>
-      <varlistentry>
-        <term><filename>remote-cryptsetup-pre.target</filename></term>
-        <listitem>
-          <para>This target unit is automatically ordered before all cryptsetup devices
-          marked with the <option>_netdev</option>. It can be used to execute additional
-          units before such devices are set up.</para>
-
-          <para>It is ordered after <filename>network.target</filename> and
-          <filename>network-online.target</filename>, and also pulls the latter in as a
-          <varname>Wants=</varname> dependency.</para>
-        </listitem>
-      </varlistentry>
       <varlistentry>
         <term><filename>remote-cryptsetup.target</filename></term>
         <listitem>
@@ -906,9 +893,10 @@
         <term><filename>remote-fs-pre.target</filename></term>
         <listitem>
           <para>This target unit is automatically ordered before all
-          remote mount point units (see above). It can be used to run
-          certain units before the remote mounts are established. Note
-          that this unit is generally not part of the initial
+          mount point units (see above) and cryptsetup devices
+          marked with the <option>_netdev</option>. It can be used to run
+          certain units before remote encrypted devices and mounts are established.
+          Note that this unit is generally not part of the initial
           transaction, unless the unit that wants to be ordered before
           all remote mounts pulls it in via a
           <varname>Wants=</varname> type dependency. If the unit wants

src/cryptsetup/cryptsetup-generator.c

@@ -113,7 +113,7 @@ static int create_disk(
                 "Conflicts=umount.target\n"
                 "IgnoreOnIsolate=true\n"
                 "After=%s\n",
-                netdev ? "remote-cryptsetup-pre.target" : "cryptsetup-pre.target");
+                netdev ? "remote-fs-pre.target" : "cryptsetup-pre.target");
 
         if (!nofail)
                 fprintf(f,

units/meson.build

@@ -48,7 +48,6 @@ units = [
         ['proc-sys-fs-binfmt_misc.mount',       'ENABLE_BINFMT'],
         ['reboot.target',                       '',
          'runlevel6.target ctrl-alt-del.target'],
-        ['remote-cryptsetup-pre.target',        'HAVE_LIBCRYPTSETUP'],
         ['remote-cryptsetup.target',            'HAVE_LIBCRYPTSETUP',
          join_paths(pkgsysconfdir, 'system/multi-user.target.wants/')],
         ['remote-fs-pre.target',                ''],

units/remote-cryptsetup-pre.target

@@ -1,15 +0,0 @@
-#  This file is part of systemd.
-#
-#  systemd is free software; you can redistribute it and/or modify it
-#  under the terms of the GNU Lesser General Public License as published by
-#  the Free Software Foundation; either version 2.1 of the License, or
-#  (at your option) any later version.
-
-[Unit]
-Description=Remote Encrypted Volumes (Pre)
-Documentation=man:systemd.special(7)
-RefuseManualStart=yes
-Before=remote-cryptsetup.target
-
-After=network.target network-online.target
-Wants=network-online.target

units/remote-cryptsetup.target

@@ -8,7 +8,7 @@
 [Unit]
 Description=Remote Encrypted Volumes
 Documentation=man:systemd.special(7)
-After=remote-cryptsetup-pre.target
+After=remote-fs-pre.target
 DefaultDependencies=no
 Conflicts=shutdown.target