don't assume that rev is a SHA1 hash

This was a problem when writing a fetcher that uses e.g. sha256 hashes
for revisions. This doesn't actually do anything new, but allows for
creating such fetchers in the future (perhaps when support for Git's
SHA256 object format gains more popularity).
This commit is contained in:
Kasper Gałkowski 2022-04-06 19:28:12 +02:00
parent f01e33f283
commit 2c2fd4946f
3 changed files with 13 additions and 6 deletions

View file

@ -238,9 +238,18 @@ std::optional<std::string> Input::getRef() const
std::optional<Hash> Input::getRev() const
{
if (auto s = maybeGetStrAttr(attrs, "rev"))
return Hash::parseAny(*s, htSHA1);
return {};
std::optional<Hash> hash = {};
if (auto s = maybeGetStrAttr(attrs, "rev")) {
try {
hash = Hash::parseAnyPrefixed(*s);
} catch (BadHash &e) {
// Default to sha1 for backwards compatibility with existing flakes
hash = Hash::parseAny(*s, htSHA1);
}
}
return hash;
}
std::optional<uint64_t> Input::getRevCount() const

View file

@ -155,7 +155,7 @@ static std::pair<std::optional<HashType>, bool> getParsedTypeAndSRI(std::string_
{
bool isSRI = false;
// Parse the has type before the separater, if there was one.
// Parse the hash type before the separator, if there was one.
std::optional<HashType> optParsedType;
{
auto hashRaw = splitPrefixTo(rest, ':');

View file

@ -93,13 +93,11 @@ public:
std::string gitRev() const
{
assert(type == htSHA1);
return to_string(Base16, false);
}
std::string gitShortRev() const
{
assert(type == htSHA1);
return std::string(to_string(Base16, false), 0, 7);
}