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6.4 Invoking guix hash

The guix hash command computes the SHA256 hash of a file. It is primarily a convenience tool for anyone contributing to the distribution: it computes the cryptographic hash of a file, which can be used in the definition of a package (see Defining Packages).

The general syntax is:

guix hash option file

guix hash has the following option:

-f fmt

Write the hash in the format specified by fmt.

Supported formats: nix-base32, base32, base16 (hex and hexadecimal can be used as well).

If the --format option is not specified, guix hash will output the hash in nix-base32. This representation is used in the definitions of packages.


Compute the hash on file recursively.

In this case, the hash is computed on an archive containing file, including its children if it is a directory. Some of the metadata of file is part of the archive; for instance, when file is a regular file, the hash is different depending on whether file is executable or not. Metadata such as time stamps has no impact on the hash (see Invoking guix archive).

As an example, here is how you would compute the hash of a Git checkout, which is useful when using the git-fetch method (see origin Reference):

$ git clone
$ cd foo
$ rm -rf .git
$ guix hash -r .