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libutil/archive: add preallocate-contents option
Make archive preallocation (fallocate) optional because some filesystems like btrfs do not behave as expected with fallocate. See #3550.
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@ -27,6 +27,8 @@ struct ArchiveSettings : Config
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#endif
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"use-case-hack",
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"Whether to enable a Darwin-specific hack for dealing with file name collisions."};
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Setting<bool> preallocateContents{this, true, "preallocate-contents",
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"Whether to preallocate files when writing objects with known size."};
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};
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static ArchiveSettings archiveSettings;
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@ -325,6 +327,9 @@ struct RestoreSink : ParseSink
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void preallocateContents(uint64_t len)
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{
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if (!archiveSettings.preallocateContents)
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return;
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#if HAVE_POSIX_FALLOCATE
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if (len) {
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errno = posix_fallocate(fd.get(), 0, len);
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