From: Eric Biggers <ebiggers3@gmail.com>
Date: Thu, 12 Nov 2015 01:43:17 +0000 (-0600)
Subject: write.c: let compaction work on untruncatable files
X-Git-Tag: v1.8.3~4
X-Git-Url: https://wimlib.net/git/?p=wimlib;a=commitdiff_plain;h=05bbdd83d65782a9872b579505e1299587cd2009;hp=ab64cfca6f15354ccef5a86441cd9c35898a220a

write.c: let compaction work on untruncatable files
---

diff --git a/src/write.c b/src/write.c
index f3308a24..7f13630c 100644
--- a/src/write.c
+++ b/src/write.c
@@ -2430,7 +2430,10 @@ finish_write(WIMStruct *wim, int image, int write_flags,
 	ret = WIMLIB_ERR_WRITE;
 	if (unlikely(write_flags & WIMLIB_WRITE_FLAG_UNSAFE_COMPACT)) {
 		/* Truncate any data the compaction freed up.  */
-		if (ftruncate(wim->out_fd.fd, wim->out_fd.offset)) {
+		if (ftruncate(wim->out_fd.fd, wim->out_fd.offset) &&
+		    errno != EINVAL) /* allow compaction on untruncatable files,
+					e.g. block devices  */
+		{
 			ERROR_WITH_ERRNO("Failed to truncate the output WIM file");
 			goto out;
 		}