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env: fix handling of long lowerdir paths in newer kernel/mount versions #1164

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env: fix handling of long lowerdir paths in newer kernel/mount versions #1164

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5 changes: 3 additions & 2 deletions crates/spfs/src/env.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1126,11 +1126,12 @@ pub(crate) fn get_overlay_args<P: AsRef<Path>>(
// the rightmost on the command line is the bottom layer, and the
// leftmost is on the top). For more details see:
// https://docs.kernel.org/filesystems/overlayfs.html#multiple-lower-layers
args.push_str("lowerdir=");
for path in layer_dirs.iter().rev() {
args.push_str("lowerdir+=");
args.push_str(&path.as_ref().to_string_lossy());
args.push(':');
args.push(',');
}
args.push_str("lowerdir+=");
args.push_str(&rt.config.lower_dir.to_string_lossy());

args.push_str(",upperdir=");
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