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Merge remote-tracking branch 'origin/master' into flakes

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This commit is contained in:
Eelco Dolstra 2020-06-26 08:46:46 +02:00
commit adf2fbbdc2
66 changed files with 751 additions and 359 deletions
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70
src/libutil/hash.cc
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@ -4,6 +4,7 @@
#include <openssl/md5.h>
#include <openssl/sha.h>
#include "args.hh"
#include "hash.hh"
#include "archive.hh"
#include "util.hh"
@ -21,11 +22,13 @@ std::set<std::string> hashTypes = { "md5", "sha1", "sha256", "sha512" };
void Hash::init()
{
if (type == htMD5) hashSize = md5HashSize;
else if (type == htSHA1) hashSize = sha1HashSize;
else if (type == htSHA256) hashSize = sha256HashSize;
else if (type == htSHA512) hashSize = sha512HashSize;
else abort();
assert(type);
switch (*type) {
case htMD5: hashSize = md5HashSize; break;
case htSHA1: hashSize = sha1HashSize; break;
case htSHA256: hashSize = sha256HashSize; break;
case htSHA512: hashSize = sha512HashSize; break;
}
assert(hashSize <= maxHashSize);
memset(hash, 0, maxHashSize);
}
@ -101,15 +104,22 @@ static string printHash32(const Hash & hash)
string printHash16or32(const Hash & hash)
{
assert(hash.type);
return hash.to_string(hash.type == htMD5 ? Base16 : Base32, false);
}
HashType assertInitHashType(const Hash & h)
{
assert(h.type);
return *h.type;
}
std::string Hash::to_string(Base base, bool includeType) const
{
std::string s;
if (base == SRI || includeType) {
s += printHashType(type);
s += printHashType(assertInitHashType(*this));
s += base == SRI ? '-' : ':';
}
switch (base) {
@ -127,8 +137,10 @@ std::string Hash::to_string(Base base, bool includeType) const
return s;
}
Hash::Hash(std::string_view s, HashType type) : Hash(s, std::optional { type }) { }
Hash::Hash(std::string_view s) : Hash(s, std::optional<HashType>{}) { }
Hash::Hash(std::string_view s, HashType type)
Hash::Hash(std::string_view s, std::optional<HashType> type)
: type(type)
{
size_t pos = 0;
@ -139,17 +151,17 @@ Hash::Hash(std::string_view s, HashType type)
sep = s.find('-');
if (sep != string::npos) {
isSRI = true;
} else if (type == htUnknown)
} else if (! type)
throw BadHash("hash '%s' does not include a type", s);
}
if (sep != string::npos) {
string hts = string(s, 0, sep);
this->type = parseHashType(hts);
if (this->type == htUnknown)
if (!this->type)
throw BadHash("unknown hash type '%s'", hts);
if (type != htUnknown && type != this->type)
throw BadHash("hash '%s' should have type '%s'", s, printHashType(type));
if (type && type != this->type)
throw BadHash("hash '%s' should have type '%s'", s, printHashType(*type));
pos = sep + 1;
}
@ -205,13 +217,15 @@ Hash::Hash(std::string_view s, HashType type)
}
else
throw BadHash("hash '%s' has wrong length for hash type '%s'", s, printHashType(type));
throw BadHash("hash '%s' has wrong length for hash type '%s'", s, printHashType(*type));
}
Hash newHashAllowEmpty(std::string hashStr, HashType ht)
Hash newHashAllowEmpty(std::string hashStr, std::optional<HashType> ht)
{
if (hashStr.empty()) {
Hash h(ht);
if (!ht)
throw BadHash("empty hash requires explicit hash type");
Hash h(*ht);
warn("found empty hash, assuming '%s'", h.to_string(SRI, true));
return h;
} else
@ -331,24 +345,36 @@ Hash compressHash(const Hash & hash, unsigned int newSize)
}
HashType parseHashType(const string & s)
std::optional<HashType> parseHashTypeOpt(const string & s)
{
if (s == "md5") return htMD5;
else if (s == "sha1") return htSHA1;
else if (s == "sha256") return htSHA256;
else if (s == "sha512") return htSHA512;
else return htUnknown;
else return std::optional<HashType> {};
}
HashType parseHashType(const string & s)
{
auto opt_h = parseHashTypeOpt(s);
if (opt_h)
return *opt_h;
else
throw UsageError("unknown hash algorithm '%1%'", s);
}
string printHashType(HashType ht)
{
if (ht == htMD5) return "md5";
else if (ht == htSHA1) return "sha1";
else if (ht == htSHA256) return "sha256";
else if (ht == htSHA512) return "sha512";
else abort();
switch (ht) {
case htMD5: return "md5";
case htSHA1: return "sha1";
case htSHA256: return "sha256";
case htSHA512: return "sha512";
default:
// illegal hash type enum value internally, as opposed to external input
// which should be validated with nice error message.
abort();
}
}
}