Nix Hash: Difference between revisions
→What exactly is hashed
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== What exactly is hashed == | == What exactly is hashed == | ||
Some content can either be hashed "flat" or "recursively". "flat" (sometimes also called "file") is simply taking the hash of the file, byte by byte, and will give you the same result as for example `sha256sum -b myfile.zip`. "recursive" (or sometimes "path") hashing takes multiple files, path names and metadata (attributes) into consideration. It works by | Some content can either be hashed "flat" or "recursively". "flat" (sometimes also called "file") is simply taking the hash of the file, byte by byte, and will give you the same result as for example `sha256sum -b myfile.zip`. "recursive" (or sometimes "path") hashing takes multiple files, path names and metadata (attributes) into consideration. It works by <abbr title="nix archive (file format)">NAR</abbr>ing the input before hashing. | ||
For <code>fetchurl</code>, the option to switch between both is called <code>recursiveHash</code> and defaults to <code>false</code>. | For <code>fetchurl</code>, the option to switch between both is called <code>recursiveHash</code> and defaults to <code>false</code>. | ||