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Git fetcher: Handle submodules for workdirs

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This commit is contained in:
Eelco Dolstra 2023-10-31 15:59:25 +01:00
parent 669b074f51
commit 0c5eac9c45
4 changed files with 119 additions and 54 deletions
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83
src/libfetchers/git-utils.cc
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@ -216,6 +216,43 @@ struct GitRepoImpl : GitRepo, std::enable_shared_from_this<GitRepoImpl>
return toHash(*oid);
}
std::vector<Submodule> parseSubmodules(const CanonPath & configFile)
{
GitConfig config;
if (git_config_open_ondisk(Setter(config), configFile.abs().c_str()))
throw Error("parsing .gitmodules file: %s", git_error_last()->message);
ConfigIterator it;
if (git_config_iterator_glob_new(Setter(it), config.get(), "^submodule\\..*\\.(path|url|branch)$"))
throw Error("iterating over .gitmodules: %s", git_error_last()->message);
std::map<std::string, std::string> entries;
while (true) {
git_config_entry * entry = nullptr;
if (auto err = git_config_next(&entry, it.get())) {
if (err == GIT_ITEROVER) break;
throw Error("iterating over .gitmodules: %s", git_error_last()->message);
}
entries.emplace(entry->name + 10, entry->value);
}
std::vector<Submodule> result;
for (auto & [key, value] : entries) {
if (!hasSuffix(key, ".path")) continue;
std::string key2(key, 0, key.size() - 5);
auto path = CanonPath(value);
result.push_back(Submodule {
.path = path,
.url = entries[key2 + ".url"],
.branch = entries[key2 + ".branch"],
});
}
return result;
}
WorkdirInfo getWorkdirInfo() override
{
WorkdirInfo info;
@ -246,6 +283,11 @@ struct GitRepoImpl : GitRepo, std::enable_shared_from_this<GitRepoImpl>
if (git_status_foreach_ext(*this, &options, &statusCallbackTrampoline, &statusCallback))
throw Error("getting working directory status: %s", git_error_last()->message);
/* Get submodule info. */
auto modulesFile = path + ".gitmodules";
if (pathExists(modulesFile.abs()))
info.submodules = parseSubmodules(modulesFile);
return info;
}
@ -261,7 +303,7 @@ struct GitRepoImpl : GitRepo, std::enable_shared_from_this<GitRepoImpl>
return std::nullopt;
}
std::vector<Submodule> getSubmodules(const Hash & rev) override;
std::vector<std::tuple<Submodule, Hash>> getSubmodules(const Hash & rev) override;
std::string resolveSubmoduleUrl(const std::string & url) override
{
@ -521,7 +563,7 @@ ref<InputAccessor> GitRepoImpl::getAccessor(const Hash & rev)
return make_ref<GitInputAccessor>(ref<GitRepoImpl>(shared_from_this()), rev);
}
std::vector<GitRepoImpl::Submodule> GitRepoImpl::getSubmodules(const Hash & rev)
std::vector<std::tuple<GitRepoImpl::Submodule, Hash>> GitRepoImpl::getSubmodules(const Hash & rev)
{
/* Read the .gitmodules files from this revision. */
CanonPath modulesFile(".gitmodules");
@ -529,44 +571,17 @@ std::vector<GitRepoImpl::Submodule> GitRepoImpl::getSubmodules(const Hash & rev)
auto accessor = getAccessor(rev);
if (!accessor->pathExists(modulesFile)) return {};
/* Parse it. */
/* Parse it and get the revision of each submodule. */
auto configS = accessor->readFile(modulesFile);
auto [fdTemp, pathTemp] = createTempFile("nix-git-submodules");
writeFull(fdTemp.get(), configS);
GitConfig config;
if (git_config_open_ondisk(Setter(config), pathTemp.c_str()))
throw Error("parsing .gitmodules file: %s", git_error_last()->message);
std::vector<std::tuple<Submodule, Hash>> result;
ConfigIterator it;
if (git_config_iterator_glob_new(Setter(it), config.get(), "^submodule\\..*\\.(path|url|branch)$"))
throw Error("iterating over .gitmodules: %s", git_error_last()->message);
std::map<std::string, std::string> entries;
while (true) {
git_config_entry * entry = nullptr;
if (auto err = git_config_next(&entry, it.get())) {
if (err == GIT_ITEROVER) break;
throw Error("iterating over .gitmodules: %s", git_error_last()->message);
}
entries.emplace(entry->name + 10, entry->value);
}
std::vector<Submodule> result;
for (auto & [key, value] : entries) {
if (!hasSuffix(key, ".path")) continue;
std::string key2(key, 0, key.size() - 5);
auto path = CanonPath(value);
auto rev = accessor.dynamic_pointer_cast<GitInputAccessor>()->getSubmoduleRev(path);
result.push_back(Submodule {
.path = path,
.url = entries[key2 + ".url"],
.branch = entries[key2 + ".branch"],
.rev = rev,
});
for (auto & submodule : parseSubmodules(CanonPath(pathTemp))) {
auto rev = accessor.dynamic_pointer_cast<GitInputAccessor>()->getSubmoduleRev(submodule.path);
result.push_back({std::move(submodule), rev});
}
return result;