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Support 'dir' and other parameters in path flakerefs

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This commit is contained in:
Eelco Dolstra 2019-05-31 19:01:11 +02:00
parent 63c5c91cc0
commit b971e406de
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GPG key ID: 8170B4726D7198DE
1 changed files with 49 additions and 41 deletions
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90
src/libexpr/primops/flakeref.cc
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@ -1,4 +1,5 @@
#include "flakeref.hh"
#include "store-api.hh"
#include <regex>
@ -30,10 +31,6 @@ const static std::string schemeRegex = "(?:http|https|ssh|git|file)";
const static std::string authorityRegex = "[a-zA-Z0-9._~-]*";
const static std::string segmentRegex = "[a-zA-Z0-9._~-]+";
const static std::string pathRegex = "/?" + segmentRegex + "(?:/" + segmentRegex + ")*";
// FIXME: support escaping in query string.
// Note: '/' is not a valid query parameter, but so what...
const static std::string paramRegex = "[a-z]+=[/a-zA-Z0-9._-]*";
const static std::string paramsRegex = "(?:[?](" + paramRegex + "(?:&" + paramRegex + ")*))";
// 'dir' path elements cannot start with a '.'. We also reject
// potentially dangerous characters like ';'.
@ -41,7 +38,7 @@ const static std::string subDirElemRegex = "(?:[a-zA-Z0-9_-]+[a-zA-Z0-9._-]*)";
const static std::string subDirRegex = subDirElemRegex + "(?:/" + subDirElemRegex + ")*";
FlakeRef::FlakeRef(const std::string & uri, bool allowRelative)
FlakeRef::FlakeRef(const std::string & uri_, bool allowRelative)
{
// FIXME: could combine this into one regex.
@ -50,21 +47,46 @@ FlakeRef::FlakeRef(const std::string & uri, bool allowRelative)
std::regex::ECMAScript);
static std::regex githubRegex(
"github:(" + ownerRegex + ")/(" + repoRegex + ")(?:/" + revOrRefRegex + ")?"
+ paramsRegex + "?",
"github:(" + ownerRegex + ")/(" + repoRegex + ")(?:/" + revOrRefRegex + ")?",
std::regex::ECMAScript);
static std::regex uriRegex(
"((" + schemeRegex + "):" +
"(?://(" + authorityRegex + "))?" +
"(" + pathRegex + "))" +
paramsRegex + "?",
"(" + pathRegex + "))",
std::regex::ECMAScript);
static std::regex refRegex2(refRegex, std::regex::ECMAScript);
static std::regex subDirRegex2(subDirRegex, std::regex::ECMAScript);
auto [uri, params] = splitUriAndParams(uri_);
auto handleSubdir = [&](const std::string & name, const std::string & value) {
if (name == "dir") {
if (value != "" && !std::regex_match(value, subDirRegex2))
throw Error("flake '%s' has invalid subdirectory '%s'", uri, value);
subdir = value;
return true;
} else
return false;
};
auto handleGitParams = [&](const std::string & name, const std::string & value) {
if (name == "rev") {
if (!std::regex_match(value, revRegex))
throw Error("invalid Git revision '%s'", value);
rev = Hash(value, htSHA1);
} else if (name == "ref") {
if (!std::regex_match(value, refRegex2))
throw Error("invalid Git ref '%s'", value);
ref = value;
} else if (handleSubdir(name, value))
;
else return false;
return true;
};
std::cmatch match;
if (std::regex_match(uri.c_str(), match, flakeRegex)) {
IsAlias d;
@ -88,17 +110,11 @@ FlakeRef::FlakeRef(const std::string & uri, bool allowRelative)
else if (match[4].matched) {
ref = match[4];
}
for (auto & param : tokenizeString<Strings>(match[5], "&")) {
auto n = param.find('=');
assert(n != param.npos);
std::string name(param, 0, n);
std::string value(param, n + 1);
if (name == "dir") {
if (value != "" && !std::regex_match(value, subDirRegex2))
throw Error("flake '%s' has invalid subdirectory '%s'", uri, value);
subdir = value;
} else
throw Error("invalid Git flake reference parameter '%s', in '%s'", name, uri);
for (auto & param : params) {
if (handleSubdir(param.first, param.second))
;
else
throw Error("invalid Git flakeref parameter '%s', in '%s'", param.first, uri);
}
data = d;
}
@ -108,26 +124,12 @@ FlakeRef::FlakeRef(const std::string & uri, bool allowRelative)
{
IsGit d;
d.uri = match[1];
for (auto & param : tokenizeString<Strings>(match[5], "&")) {
auto n = param.find('=');
assert(n != param.npos);
std::string name(param, 0, n);
std::string value(param, n + 1);
if (name == "rev") {
if (!std::regex_match(value, revRegex))
throw Error("invalid Git revision '%s'", value);
rev = Hash(value, htSHA1);
} else if (name == "ref") {
if (!std::regex_match(value, refRegex2))
throw Error("invalid Git ref '%s'", value);
ref = value;
} else if (name == "dir") {
if (value != "" && !std::regex_match(value, subDirRegex2))
throw Error("flake '%s' has invalid subdirectory '%s'", uri, value);
subdir = value;
} else
for (auto & param : params) {
if (handleGitParams(param.first, param.second))
;
else
// FIXME: should probably pass through unknown parameters
throw Error("invalid Git flake reference parameter '%s', in '%s'", name, uri);
throw Error("invalid Git flakeref parameter '%s', in '%s'", param.first, uri);
}
if (rev && !ref)
throw Error("flake URI '%s' lacks a Git ref", uri);
@ -138,6 +140,12 @@ FlakeRef::FlakeRef(const std::string & uri, bool allowRelative)
IsPath d;
d.path = allowRelative ? absPath(uri) : canonPath(uri);
data = d;
for (auto & param : params) {
if (handleGitParams(param.first, param.second))
;
else
throw Error("invalid Git flakeref parameter '%s', in '%s'", param.first, uri);
}
}
else
@ -165,10 +173,10 @@ std::string FlakeRef::to_string() const
}
else if (auto refData = std::get_if<FlakeRef::IsPath>(&data)) {
assert(subdir == "");
string = refData->path;
if (ref) addParam("ref", *ref);
if (rev) addParam("rev", rev->gitRev());
return refData->path;
if (subdir != "") addParam("dir", subdir);
}
else if (auto refData = std::get_if<FlakeRef::IsGitHub>(&data)) {