4 files changed, 43 insertions, 5 deletions
diff --git a/lib/tar/Makemodule.am b/lib/tar/Makemodule.am
index f0945ff..abc0209 100644
--- a/lib/tar/Makemodule.am
+++ b/lib/tar/Makemodule.am
@@ -3,6 +3,7 @@ libtar_a_SOURCES += lib/tar/number.c lib/tar/checksum.c lib/tar/cleanup.c
 libtar_a_SOURCES += lib/tar/read_sparse_map.c lib/tar/read_sparse_map_old.c
 libtar_a_SOURCES += lib/tar/base64.c lib/tar/urldecode.c lib/tar/internal.h
 libtar_a_SOURCES += lib/tar/padd_file.c lib/tar/read_retry.c include/tar.h
+libtar_a_SOURCES += lib/tar/write_retry.c
 libtar_a_CFLAGS = $(AM_CFLAGS)
 libtar_a_CPPFLAGS = $(AM_CPPFLAGS)
 
diff --git a/lib/tar/padd_file.c b/lib/tar/padd_file.c
index 471370d..f58cfbf 100644
--- a/lib/tar/padd_file.c
+++ b/lib/tar/padd_file.c
@@ -25,8 +25,8 @@ int padd_file(int outfd, sqfs_u64 size)
 	if (buffer == NULL)
 		goto fail_errno;
 
-	if (write_data("padding output file to block size",
-		       outfd, buffer, padd_sz)) {
+	if (write_retry("padding output file to block size",
+			outfd, buffer, padd_sz)) {
 		goto out;
 	}
 
diff --git a/lib/tar/write_header.c b/lib/tar/write_header.c
index 14802c0..84aa2d3 100644
--- a/lib/tar/write_header.c
+++ b/lib/tar/write_header.c
@@ -88,7 +88,7 @@ static int write_header(int fd, const struct stat *sb, const char *name,
 
 	update_checksum(&hdr);
 
-	return write_data("writing tar header record", fd, &hdr, sizeof(hdr));
+	return write_retry("writing tar header record", fd, &hdr, sizeof(hdr));
 }
 
 static int write_gnu_header(int fd, const struct stat *orig,
@@ -104,8 +104,8 @@ static int write_gnu_header(int fd, const struct stat *orig,
 	if (write_header(fd, &sb, name, NULL, type))
 		return -1;
 
-	if (write_data("writing GNU extension header",
-		       fd, payload, payload_len)) {
+	if (write_retry("writing GNU extension header",
+			fd, payload, payload_len)) {
 		return -1;
 	}
 
diff --git a/lib/tar/write_retry.c b/lib/tar/write_retry.c
new file mode 100644
index 0000000..1ff1a7e
--- /dev/null
+++ b/lib/tar/write_retry.c
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * write_retry.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include "tar.h"
+
+int write_retry(const char *errstr, int fd, const void *data, size_t size)
+{
+	ssize_t ret;
+
+	while (size > 0) {
+		ret = write(fd, data, size);
+		if (ret == 0) {
+			fprintf(stderr, "%s: write truncated\n", errstr);
+			return -1;
+		}
+		if (ret < 0) {
+			if (errno == EINTR)
+				continue;
+			perror(errstr);
+			return -1;
+		}
+
+		data = (const char *)data + ret;
+		size -= ret;
+	}
+
+	return 0;
+}