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Clean up Base* code

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Make it separate from Hash, since other things can be base-encoded too.

This isn't really needed for Nix, but it makes the code easier to read
e.g. for someone reimplementing this stuff in a different language. (Of
course, Base16/Base64 should be gotten off-the-shelf, but now the hash
code, which is more bespoke, is less cluttered with the parts that would
be from some library.)

Many reimplementations of "Nix32" and our hash type already exist, so
this cleanup is coming years too late, but I say better late than never
/ it is always good to nudge the code in the direction of being a
"living spec".

Co-authored-by: Sergei Zimmerman <sergei@zimmerman.foo>
This commit is contained in:
John Ericson 2025-08-05 14:12:00 -04:00
parent 664f06c94c
commit 991831227e
18 changed files with 357 additions and 244 deletions
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3
src/libfetchers/git-utils.cc
View file

@ -2,6 +2,7 @@
#include "nix/fetchers/git-lfs-fetch.hh"
#include "nix/fetchers/cache.hh"
#include "nix/fetchers/fetch-settings.hh"
#include "nix/util/base-n.hh"
#include "nix/util/finally.hh"
#include "nix/util/processes.hh"
#include "nix/util/signals.hh"
@ -608,7 +609,7 @@ struct GitRepoImpl : GitRepo, std::enable_shared_from_this<GitRepoImpl>
// Calculate sha256 fingerprint from public key and escape the regex symbol '+' to match the key literally
std::string keyDecoded;
try {
keyDecoded = base64Decode(k.key);
keyDecoded = base64::decode(k.key);
} catch (Error & e) {
e.addTrace({}, "while decoding public key '%s' used for git signature", k.key);
}