add gen sub packages.

Signed-off-by: yyjeqhc <1772413353@qq.com>

macros.buildsystem.rustcrates

@@ -1,13 +1,40 @@
+# Dynamic specpart generator for rust feature metapackage %files (build phase)
+%rustcrates_gen_feature_specparts() %{expand:\
+  if [ ! -d "$RPM_SPECPARTS_DIR" ]; then \
+    echo "error: dynamic spec generation is not supported by this RPM version (missing RPM_SPECPARTS_DIR)" >&2 ; \
+    exit 1 ; \
+  fi ; \
+  specpart="$RPM_SPECPARTS_DIR/50-feature-files.specpart" ; \
+  : > "$specpart" ; \
+  set -- %{_sourcedir}/*.spec ; \
+  spec_self="$1" ; \
+  awk ' \
+    /^[[:space:]]*%package[[:space:]]+/ { \
+      if (match($0, /-n[[:space:]]+%\\{name\\}\\+([A-Za-z0-9_.-]+)/, m) && !seen[m[1]]++) { \
+        print "%%files -n %%{name}+" m[1] ; \
+        print "" ; \
+        found = 1 ; \
+      } \
+    } \
+    END { \
+      exit(found ? 0 : 2) ; \
+    } \
+  ' "$spec_self" > "$specpart" || \
+  echo "warning: no feature subpackages parsed from $spec_self" >&2 ; \
+}
+
 # Example buildsystem for rust crates
-%buildsystem_rustcrates_prep() %{expand:\\\
-  %autosetup -C -p1 %*  \\\
+%buildsystem_rustcrates_prep() %{expand:\
+  %autosetup -C -p1 %* \
 }
 %buildsystem_rustcrates_conf() %nil
-%buildsystem_rustcrates_build() %nil
-%buildsystem_rustcrates_install() %{expand:\\\
-  %__install -d %{buildroot}%{_datadir}/cargo/registry/%{crate_name}-%{version} ; \\\
-  %__cp -a . %{buildroot}%{_datadir}/cargo/registry/%{crate_name}-%{version}/ ; \\\
-  %__rm -f %{buildroot}%{_datadir}/cargo/registry/%{crate_name}-%{version}/*checksum.json ; \\\
-  echo '{"files":{},"package":null}' > %{buildroot}%{_datadir}/cargo/registry/%{crate_name}-%{version}/.cargo-checksum.json \\\
+%buildsystem_rustcrates_build() %{expand:\
+  %rustcrates_gen_feature_specparts \
 }
-%buildsystem_rustcrates_check() %nil
+%buildsystem_rustcrates_install() %{expand:\
+  %__install -d %{buildroot}%{_datadir}/cargo/registry/%{crate_name}-%{version} ; \
+  %__cp -a . %{buildroot}%{_datadir}/cargo/registry/%{crate_name}-%{version}/ ; \
+  %__rm -f %{buildroot}%{_datadir}/cargo/registry/%{crate_name}-%{version}/*checksum.json ; \
+  echo '{"files":{},"package":null}' > %{buildroot}%{_datadir}/cargo/registry/%{crate_name}-%{version}/.cargo-checksum.json \
+}
+%buildsystem_rustcrates_check() %nil