Split out -sysusers and -shared

... (rhbz#2344322)

rpm-libs has Requires:/usr/bin/systemd-sysusers.

We split split out /usr/bin/systemd-sysusers (the normal version) to a
subpackage, and the shared library
/usr/lib64/systemd/libsystemd-shared-257.2-14.fc42.so to a second subpackage.
(In preparation for maybe making further splits later.)
systemd-sysusers+libsystemd-shared.so is 4.8MB, but libsystemd-shared.so also
pulls in a bunch of libraries. We'll find out what the actual change in
installation footprint (compared to systemd-standalone-sysusers) really is when
we build some images with the new split.

split-files.py

@@ -57,12 +57,14 @@ def files(root):
 
 outputs = {suffix: open(f'.file-list-{suffix}', 'w')
            for suffix in (
+                   'shared',
                    'libs',
                    'udev',
                    'ukify',
                    'boot',
                    'pam',
                    'rpm-macros',
+                   'sysusers',
                    'devel',
                    'container',
                    'networkd',
@@ -122,8 +124,10 @@ for file in files(buildroot):
         o = outputs['tests']
     elif 'ukify' in n:
         o = outputs['ukify']
-    elif re.search(r'/libsystemd-(shared|core)-.*\.so$', n):
+    elif re.search(r'/libsystemd-core-.*\.so$', n):
         o = outputs['main']
+    elif re.search(r'/libsystemd-shared-.*\.so$', n):
+        o = outputs['shared']
     elif re.search(r'/libcryptsetup-token-systemd-.*\.so$', n):
         o = outputs['udev']
     elif re.search(r'/lib.*\.pc|/man3/|/usr/include|\.so$', n):
@@ -135,6 +139,14 @@ for file in files(buildroot):
     ''', n, re.X):
         o = outputs['remote']
 
+    # Just the binary, the dir, and the man page.
+    elif re.search(r'''systemd-sysusers$|
+                       sysusers\.d$|
+                       man/.*sysusers\.d\.5|
+                       man/.*systemd-sysusers\.8
+    ''', n, re.X):
+        o = outputs['sysusers']
+
     elif re.search(r'''mymachines|
                        machinectl|
                        importctl|

systemd.spec

@@ -253,6 +253,8 @@ Requires(meta): (%{name}-rpm-macros = %{version}-%{release} if rpm-build)
 Requires:       %{name}-libs%{_isa} = %{version}-%{release}
 %{?fedora:Recommends:     %{name}-networkd = %{version}-%{release}}
 %{?fedora:Recommends:     %{name}-resolved = %{version}-%{release}}
+Requires:       %{name}-shared%{_isa} = %{version}-%{release}
+Requires:       %{name}-sysusers%{_isa} = %{version}-%{release}
 Recommends:     diffutils
 Requires:       (util-linux-core or util-linux)
 Provides:       /bin/systemctl
@@ -264,7 +266,7 @@ Provides:       system-setup-keyboard = 0.9
 # systemd-sysv-convert was removed in f20: https://fedorahosted.org/fpc/ticket/308
 Obsoletes:      systemd-sysv < 206
 # self-obsoletes so that dnf will install new subpackages on upgrade (#1260394)
-Obsoletes:      %{name} < 249~~
+Obsoletes:      systemd < 257.3-4
 Provides:       systemd-sysv = 206
 Conflicts:      initscripts < 9.56.1
 %if 0%{?fedora}
@@ -290,8 +292,6 @@ Obsoletes:      timedatex < 0.6-3
 Provides:       timedatex = 0.6-3
 Conflicts:      %{name}-standalone-tmpfiles
 Provides:       %{name}-tmpfiles = %{version}-%{release}
-Conflicts:      %{name}-standalone-sysusers
-Provides:       %{name}-sysusers = %{version}-%{release}
 Conflicts:      %{name}-standalone-shutdown
 Provides:       %{name}-shutdown = %{version}-%{release}
 
@@ -371,6 +371,13 @@ Provides:       nss-myhostname%{_isa} = 0.4
 %description libs
 Libraries for systemd and udev.
 
+%package shared
+Summary:        Internal systemd shared library
+License:        LGPL-2.1-or-later AND MIT
+
+%description shared
+Internal libraries used by various systemd binaries.
+
 %package pam
 Summary:        systemd PAM module
 Requires:       %{name} = %{version}-%{release}
@@ -389,6 +396,15 @@ See
 https://docs.fedoraproject.org/en-US/packaging-guidelines/Scriptlets/#_systemd
 for information how to use those macros.
 
+%package sysusers
+Summary:        systemd-sysusers program
+Requires:       %{name}-shared%{_isa} = %{version}-%{release}
+Conflicts:      %{name}-standalone-sysusers
+Obsoletes:      systemd < 257.3-4
+
+%description sysusers
+This package contains the systemd-sysusers program.
+
 %package devel
 Summary:        Development headers for systemd
 License:        LGPL-2.1-or-later AND MIT
@@ -1322,10 +1338,16 @@ fi
 %files libs -f .file-list-libs
 %license LICENSE.LGPL2.1
 
+%files shared -f .file-list-shared
+%license LICENSE.LGPL2.1
+%license LICENSES/MIT.txt
+
 %files pam -f .file-list-pam
 
 %files rpm-macros -f .file-list-rpm-macros
 
+%files sysusers -f .file-list-sysusers
+
 %files resolved -f .file-list-resolve
 
 %files devel -f .file-list-devel