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53 lines
1.5 KiB
53 lines
1.5 KiB
3 weeks ago
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From 90f446f9b04ab820a99b9408e68c01dc6b57056c Mon Sep 17 00:00:00 2001
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From: rpm-build <rpm-build>
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Date: Mon, 28 Jul 2014 08:10:10 +0200
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Subject: [PATCH 2/9] vfat-like FS & sparse (still downstream)
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Fix extracting sparse files to a file system like vfat, when
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ftruncate may fail to grow the size of a file. Still downstram,
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(do we need this now? ftruncate & vfat works is now OK).
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Resolves: #179507
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Upstream bugreport:
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http://lists.gnu.org/archive/html/bug-tar/2006-02/msg00000.html
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---
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src/system.c | 19 ++++++++++++++++++-
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1 file changed, 18 insertions(+), 1 deletion(-)
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diff --git a/src/system.c b/src/system.c
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index 9414233..37e9a3e 100644
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--- a/src/system.c
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+++ b/src/system.c
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@@ -243,8 +243,25 @@ sys_compare_links (struct stat *link_data, struct stat *stat_data)
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int
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sys_truncate (int fd)
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{
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+ struct stat st;
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off_t pos = lseek (fd, (off_t) 0, SEEK_CUR);
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- return pos < 0 ? -1 : ftruncate (fd, pos);
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+
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+ if ( pos < 0)
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+ return -1;
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+
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+ if ( ftruncate(fd, pos) && errno == EPERM ) {
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+ /* wrapper around ftruncate:
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+ * ftruncate may fail to grow the size of a file with some OS and filesystem
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+ * combinations. Linux and vfat/fat is one example. If this is the case do
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+ * a write to grow the file to the desired length.
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+ */
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+ if( (fstat( fd, &st ) == -1) ||
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+ (st.st_size >= pos) ||
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+ (lseek( fd, pos - 1, SEEK_SET) == (off_t)-1) ||
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+ (write( fd, "\0", 1) == -1) )
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+ return -1;
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+ }
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+ return 0;
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}
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/* Return nonzero if NAME is the name of a regular file, or if the file
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--
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1.9.3
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