lix-releng-staging/src/nix-hash/help.txt

nix-hash [OPTIONS...] [FILES...]

`nix-hash' computes and prints cryptographic hashes for the specified
files.

  --flat: compute hash of regular file contents, not metadata
  --base32: print hash in base-32 instead of hexadecimal
  --type HASH: use hash algorithm HASH ("md5" (default), "sha1", "sha256")
* Help text for all (non-script) programs, so no more: $ nix-instantiate --help error: unknown flag `--help` Try `nix-instantiate --help' for more information. :-) 2003-12-01 15:55:05 +00:00			`nix-hash [OPTIONS...] [FILES...]`

* Lots of manual stuff. Reference pages for most Nix commands. * nix-pull now requires the full url to the manifest, i.e., `/MANIFEST/' is no longer automatically appended. * nix-prefetch-url works again. 2004-02-10 16:14:47 +00:00			`nix-hash' computes and prints cryptographic hashes for the specified
* Help text for all (non-script) programs, so no more: $ nix-instantiate --help error: unknown flag `--help` Try `nix-instantiate --help' for more information. :-) 2003-12-01 15:55:05 +00:00			`files.`

			`--flat: compute hash of regular file contents, not metadata`
* Removed the `id' attribute hack. * Formalise the notion of fixed-output derivations, i.e., derivations for which a cryptographic hash of the output is known in advance. Changes to such derivations should not propagate upwards through the dependency graph. Previously this was done by specifying the hash component of the output path through the `id' attribute, but this is insecure since you can lie about it (i.e., you can specify any hash and then produce a completely different output). Now the responsibility for checking the output is moved from the builder to Nix itself. A fixed-output derivation can be created by specifying the `outputHash' and `outputHashAlgo' attributes, the latter taking values `md5', `sha1', and `sha256', and the former specifying the actual hash in hexadecimal or in base-32 (auto-detected by looking at the length of the attribute value). MD5 is included for compatibility but should be considered deprecated. * Removed the `drvPath' pseudo-attribute in derivation results. It's no longer necessary. * Cleaned up the support for multiple output paths in derivation store expressions. Each output now has a unique identifier (e.g., `out', `devel', `docs'). Previously there was no way to tell output paths apart at the store expression level. * `nix-hash' now has a flag `--base32' to specify that the hash should be printed in base-32 notation. * `fetchurl' accepts parameters `sha256' and `sha1' in addition to `md5'. * `nix-prefetch-url' now prints out a SHA-1 hash in base-32. (TODO: a flag to specify the hash.) 2005-01-17 16:55:19 +00:00			`--base32: print hash in base-32 instead of hexadecimal`
			`--type HASH: use hash algorithm HASH ("md5" (default), "sha1", "sha256")`