Add %specpartsdir to macros.in

so it can be configured from the spec file

Also move the dir beside the %buildsubdir as %{buildsubdir}-SPECPARTS so
it doesn't pollute the %buildsubdir.

This patch is still missing adjustments to the dynamic_specs.md as we
might decide to keep the SPECPARTS in %buildsubdir

build/build.c

@@ -195,6 +195,11 @@ rpmRC doScript(rpmSpec spec, rpmBuildFlags what, const char *name,
 	fprintf(fp, "cd '%s'\n", buildSubdir);
 
     if (what == RPMBUILD_RMBUILD) {
+	if (rpmMacroIsDefined(spec->macros, "specpartsdir")) {
+	    char * buf = rpmExpand("%{specpartsdir}", NULL);
+	    fprintf(fp, "rm -rf '%s'\n", buf);
+	    free(buf);
+	}
 	if (buildSubdir[0] != '\0')
 	    fprintf(fp, "rm -rf '%s' '%s.gemspec'\n",
 		    buildSubdir, buildSubdir);

build/parsePrep.c

@@ -274,13 +274,14 @@ static int doSetupMacro(rpmSpec spec, const char *line)
     }
 
     /* mkdir for dynamic specparts */
-    buf = rpmExpand("%{__mkdir_p} SPECPARTS", NULL);
-    appendBuf(spec, buf, 1);
-    free(buf);
-
-    buf = rpmGenPath("%{_builddir}", "%{buildsubdir}", "SPECPARTS");
-    rpmPushMacro(spec->macros, "specpartsdir", NULL, buf, RMIL_SPEC);
-    free(buf);
+    if (rpmMacroIsDefined(spec->macros, "specpartsdir")) {
+	buf = rpmExpand("rm -rf '%{specpartsdir}'", NULL);
+	appendBuf(spec, buf, 1);
+	free(buf);
+	buf = rpmExpand("%{__mkdir_p} '%{specpartsdir}'", NULL);
+	appendBuf(spec, buf, 1);
+	free(buf);
+    }
 
     appendBuf(spec, getStringBuf(after), 0);
 

macros.in

@@ -132,6 +132,8 @@
 
 %_keyringpath		%{_dbpath}/pubkeys/
 
+%specpartsdir %{_builddir}/%{buildsubdir}-SPECPARTS
+
 # sysusers helper binary or script, uncomment to disable
 %__systemd_sysusers	%{_bindir}/systemd-sysusers
 

tests/rpmspec.at

@@ -333,7 +333,8 @@ if [ $STATUS -ne 0 ]; then
   exit $STATUS
 fi
 cd 'hello-1.0'
-/usr/bin/mkdir -p SPECPARTS
+rm -rf '/build/BUILD/hello-1.0-SPECPARTS'
+/usr/bin/mkdir -p '/build/BUILD/hello-1.0-SPECPARTS'
 /usr/bin/chmod -Rf a+rX,u+w,g-w,o-w .
 echo "Patch #0 (hello-1.0-modernize.patch):"
 /usr/bin/patch --no-backup-if-mismatch -f -p1 -b --suffix .modernize --fuzz=0 < /build/SOURCES/hello-1.0-modernize.patch