forked from josch/mmdebstrap
Return the same block number irrespective of what is in /dev
Depending on the mode an on whether mknod works (mount options of $TMPDIR) different stuff might be in /dev. To make the blocksize in of the ext2 output format reproducible, ignore the content of /dev.
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@ -2857,8 +2857,10 @@ sub guess_sources_format {
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sub approx_disk_usage {
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my $directory = shift;
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info "approximating disk usage...";
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# to return the same number of blocks irrespective of the chosen mode
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# we exclude /dev from being counted
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open my $fh, '-|', 'du', '--block-size', '1024',
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'--summarize', '--one-file-system',
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"--exclude=$directory/dev", '--summarize', '--one-file-system',
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$directory // error "failed to fork(): $!";
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chomp(
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my $du = do { local $/; <$fh> }
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