test: replace symlinks with actual unit files

During installation, meson complains:
> Installing /home/zbyszek/src/systemd-work/test/units/sysinit.target to /var/tmp/systemd-test.Q1FSuj/root/usr/lib/systemd/tests/testdata/units
> Warning: trying to copy a symlink that points to a file. This will copy the file,
> but this will be changed in a future version of Meson to copy the symlink as is. Please update your
> build definitions so that it will not break when the change happens.

It *is* convenient to have those files as symlinks, but it is also confusing,
because symlinks create aliases, and it seems that in those cases we actually
don't want aliases (at least in the case of loopy*.service that'd make the test
pointless).

test/test-path/basic.target

@@ -1 +0,0 @@
-../../units/basic.target

test/test-path/basic.target

@@ -0,0 +1,22 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=Basic System
+Documentation=man:systemd.special(7)
+Requires=sysinit.target
+Wants=sockets.target timers.target paths.target slices.target
+After=sysinit.target sockets.target paths.target slices.target tmp.mount
+
+# We support /var, /tmp, /var/tmp, being on NFS, but we don't pull in
+# remote-fs.target by default, hence pull them in explicitly here. Note that we
+# require /var and /var/tmp, but only add a Wants= type dependency on /tmp, as
+# we support that unit being masked, and this should not be considered an error.
+RequiresMountsFor=/var /var/tmp
+Wants=tmp.mount

test/test-path/path-changed.service

@@ -1 +0,0 @@
-path-service.service

test/test-path/path-changed.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Service Test for Path units
+
+[Service]
+ExecStart=/bin/true
+Type=oneshot

test/test-path/path-directorynotempty.service

@@ -1 +0,0 @@
-path-service.service

test/test-path/path-directorynotempty.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Service Test for Path units
+
+[Service]
+ExecStart=/bin/true
+Type=oneshot

test/test-path/path-exists.service

@@ -1 +0,0 @@
-path-service.service

test/test-path/path-exists.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Service Test for Path units
+
+[Service]
+ExecStart=/bin/true
+Type=oneshot

test/test-path/path-existsglob.service

@@ -1 +0,0 @@
-path-service.service

test/test-path/path-existsglob.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Service Test for Path units
+
+[Service]
+ExecStart=/bin/true
+Type=oneshot

test/test-path/path-makedirectory.service

@@ -1 +0,0 @@
-path-service.service

test/test-path/path-makedirectory.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Service Test for Path units
+
+[Service]
+ExecStart=/bin/true
+Type=oneshot

test/test-path/path-modified.service

@@ -1 +0,0 @@
-path-service.service

test/test-path/path-modified.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Service Test for Path units
+
+[Service]
+ExecStart=/bin/true
+Type=oneshot

test/test-path/paths.target

@@ -1 +0,0 @@
-../../units/paths.target

test/test-path/paths.target

@@ -0,0 +1,12 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=Paths
+Documentation=man:systemd.special(7)

test/test-path/sysinit.target

@@ -1 +0,0 @@
-../../units/sysinit.target

test/test-path/sysinit.target

@@ -0,0 +1,15 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=System Initialization
+Documentation=man:systemd.special(7)
+Conflicts=emergency.service emergency.target
+Wants=local-fs.target swap.target
+After=local-fs.target swap.target emergency.service emergency.target

test/units/basic.target

@@ -1 +0,0 @@
-../../units/basic.target

test/units/basic.target

@@ -0,0 +1,22 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=Basic System
+Documentation=man:systemd.special(7)
+Requires=sysinit.target
+Wants=sockets.target timers.target paths.target slices.target
+After=sysinit.target sockets.target paths.target slices.target tmp.mount
+
+# We support /var, /tmp, /var/tmp, being on NFS, but we don't pull in
+# remote-fs.target by default, hence pull them in explicitly here. Note that we
+# require /var and /var/tmp, but only add a Wants= type dependency on /tmp, as
+# we support that unit being masked, and this should not be considered an error.
+RequiresMountsFor=/var /var/tmp
+Wants=tmp.mount

test/units/loopy2.service

@@ -1 +0,0 @@
-loopy.service

test/units/loopy2.service

@@ -0,0 +1,2 @@
+[Service]
+ExecStart=/bin/true

test/units/loopy4.service

@@ -1 +0,0 @@
-loopy3.service

test/units/loopy4.service

@@ -0,0 +1,5 @@
+[Service]
+ExecStart=/bin/true
+
+[Unit]
+Conflicts=loopy4.service

test/units/shutdown.target

@@ -1 +0,0 @@
-../../units/shutdown.target

test/units/shutdown.target

@@ -0,0 +1,14 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=Shutdown
+Documentation=man:systemd.special(7)
+DefaultDependencies=no
+RefuseManualStart=yes

test/units/sockets.target

@@ -1 +0,0 @@
-../../units/sockets.target

test/units/sockets.target

@@ -0,0 +1,12 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=Sockets
+Documentation=man:systemd.special(7)

test/units/sysinit.target

@@ -1 +0,0 @@
-../../units/sysinit.target

test/units/sysinit.target

@@ -0,0 +1,15 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=System Initialization
+Documentation=man:systemd.special(7)
+Conflicts=emergency.service emergency.target
+Wants=local-fs.target swap.target
+After=local-fs.target swap.target emergency.service emergency.target

test/units/timers.target

@@ -1 +0,0 @@
-../../units/timers.target

test/units/timers.target

@@ -0,0 +1,15 @@
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  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=Timers
+Documentation=man:systemd.special(7)
+
+DefaultDependencies=no
+Conflicts=shutdown.target