* utils/geninitrdsz.c: Added util to generate the initrd.size file

   needed on zSeries (#197773).

   * utils/Makefile: Compile geninitrdsz, install to anaconda-runtime.

   * scripts/mk-images: Define GENINITRDSZ command.

   * scripts/mk-images.s390: Generate initrd.size for each s390 tree
   build.

2 files changed, 52 insertions, 2 deletions

diff --git a/utils/Makefile b/utils/Makefile
index 313f89723..ee5bc9994 100644
--- a/utils/Makefile
+++ b/utils/Makefile
@@ -19,7 +19,7 @@ endif
 
 everything: $(TARGET)
 
-all:	modlist moddeps snarffont mapshdr readmap
+all:	modlist moddeps snarffont mapshdr readmap geninitrdsz
 
 modlist: modlist.o moduleinfo.o
 	$(CC) $(LDFLAGS) -o modlist modlist.o moduleinfo.o $(LOADLIBES)
@@ -42,6 +42,9 @@ md5.o: md5.c md5.h
 hash.o : hash.c
 	$(CC) $(RPMCFLAGS) -c -o $@ $<
 
+geninitrdsz: geninitrdsz.c
+	$(CC) $(CFLAGS) -o $@ $<
+
 depends:
 
 install: all
@@ -54,9 +57,10 @@ install: all
 	install -m755 modlist $(DESTDIR)/$(RUNTIMEDIR)
 	install -m755 readmap $(DESTDIR)/$(RUNTIMEDIR)
 	install -m755 mapshdr $(DESTDIR)/$(RUNTIMEDIR)
+	install -m755 geninitrdsz $(DESTDIR)/$(RUNTIMEDIR)
 
 clean:	
-	rm -f modlist moddeps snarffont mapshdr readmap \
+	rm -f modlist moddeps snarffont mapshdr readmap geninitrdsz \
 	moduledeps.c moduleinfo.c .depend *.o
 
 depend:
diff --git a/utils/geninitrdsz.c b/utils/geninitrdsz.c
new file mode 100644
index 000000000..5b8b8048e
--- /dev/null
+++ b/utils/geninitrdsz.c
@@ -0,0 +1,46 @@
+/*
+ * Generate initrd.size file for zSeries platforms.
+ * Takes an integer argument and writes out the binary representation of
+ * that value to the initrd.size file.
+ * https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=197773
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+int main(int argc,char **argv) {
+    unsigned int zero = 0;
+    int fd;
+    unsigned int size;
+
+    if (argc != 3) {
+        printf("Usage: %s [integer size] [output file]\n", basename(argv[0]));
+        printf("Example: %s 12288475 initrd.size\n", basename(argv[0]));
+        return 0;
+    }
+
+    size = htonl(atoi(argv[1]));
+
+    fd = open(argv[2], O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
+
+    if (write(fd, &zero, sizeof(int)) == -1) {
+        perror("writing initrd.size (zero)");
+        return errno;
+    }
+
+    if (write(fd, &size, sizeof(int)) == -1) {
+        perror("writing initrd.size (size)");
+        return errno;
+    }
+
+    close(fd);
+    return 0;
+}