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32 lines
962 B
32 lines
962 B
7 years ago
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diff --git a/src/system.c b/src/system.c
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index ba4ac2d..ea88cd6 100644
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--- a/src/system.c
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+++ b/src/system.c
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@@ -231,8 +231,25 @@ 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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