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Merge pull request #9229 from tfc/small-improvements

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Remove warnings, small improvements

(cherry picked from commit 5ac87a75dd65c19c50976559a6f7810c315cd9d5)
Change-Id: I88349b6e954398dde83c845f42d41a9dd89ba9e0
This commit is contained in:
eldritch horrors 2024-03-04 05:16:42 +01:00
parent ea10088703
commit 8abb20390e
3 changed files with 51 additions and 44 deletions
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22
src/libstore/builtins/buildenv.cc
View file

@ -174,15 +174,19 @@ void builtinBuildenv(const BasicDerivation & drv)
/* Convert the stuff we get from the environment back into a
* coherent data type. */
Packages pkgs;
auto derivations = tokenizeString<Strings>(getAttr("derivations"));
while (!derivations.empty()) {
/* !!! We're trusting the caller to structure derivations env var correctly */
auto active = derivations.front(); derivations.pop_front();
auto priority = stoi(derivations.front()); derivations.pop_front();
auto outputs = stoi(derivations.front()); derivations.pop_front();
for (auto n = 0; n < outputs; n++) {
auto path = derivations.front(); derivations.pop_front();
pkgs.emplace_back(path, active != "false", priority);
{
auto derivations = tokenizeString<Strings>(getAttr("derivations"));
auto itemIt = derivations.begin();
while (itemIt != derivations.end()) {
/* !!! We're trusting the caller to structure derivations env var correctly */
const bool active = "false" != *itemIt++;
const int priority = stoi(*itemIt++);
const size_t outputs = stoul(*itemIt++);
for (size_t n {0}; n < outputs; n++) {
pkgs.emplace_back(std::move(*itemIt++), active, priority);
}
}
}

13
src/libstore/content-address.cc
View file

@ -29,12 +29,13 @@ std::string ContentAddressMethod::renderPrefix() const
ContentAddressMethod ContentAddressMethod::parsePrefix(std::string_view & m)
{
ContentAddressMethod method = FileIngestionMethod::Flat;
if (splitPrefix(m, "r:"))
method = FileIngestionMethod::Recursive;
else if (splitPrefix(m, "text:"))
method = TextIngestionMethod {};
return method;
if (splitPrefix(m, "r:")) {
return FileIngestionMethod::Recursive;
}
else if (splitPrefix(m, "text:")) {
return TextIngestionMethod {};
}
return FileIngestionMethod::Flat;
}
std::string ContentAddressMethod::render(HashType ht) const

60
src/libstore/lock.cc
View file

@ -7,6 +7,31 @@
namespace nix {
#if __linux__
static std::vector<gid_t> get_group_list(const char *username, gid_t group_id)
{
std::vector<gid_t> gids;
gids.resize(32); // Initial guess
auto getgroupl_failed {[&] {
int ngroups = gids.size();
int err = getgrouplist(username, group_id, gids.data(), &ngroups);
gids.resize(ngroups);
return err == -1;
}};
// The first error means that the vector was not big enough.
// If it happens again, there is some different problem.
if (getgroupl_failed() && getgroupl_failed()) {
throw SysError("failed to get list of supplementary groups for '%s'", username);
}
return gids;
}
#endif
struct SimpleUserLock : UserLock
{
AutoCloseFD fdUserLock;
@ -67,37 +92,14 @@ struct SimpleUserLock : UserLock
throw Error("the Nix user should not be a member of '%s'", settings.buildUsersGroup);
#if __linux__
/* Get the list of supplementary groups of this build
user. This is usually either empty or contains a
group such as "kvm". */
int ngroups = 32; // arbitrary initial guess
std::vector<gid_t> gids;
gids.resize(ngroups);
int err = getgrouplist(
pw->pw_name, pw->pw_gid,
gids.data(),
&ngroups);
/* Our initial size of 32 wasn't sufficient, the
correct size has been stored in ngroups, so we try
again. */
if (err == -1) {
gids.resize(ngroups);
err = getgrouplist(
pw->pw_name, pw->pw_gid,
gids.data(),
&ngroups);
}
// If it failed once more, then something must be broken.
if (err == -1)
throw Error("failed to get list of supplementary groups for '%s'", pw->pw_name);
/* Get the list of supplementary groups of this user. This is
* usually either empty or contains a group such as "kvm". */
// Finally, trim back the GID list to its real size.
for (auto i = 0; i < ngroups; i++)
if (gids[i] != lock->gid)
lock->supplementaryGIDs.push_back(gids[i]);
for (auto gid : get_group_list(pw->pw_name, pw->pw_gid)) {
if (gid != lock->gid)
lock->supplementaryGIDs.push_back(gid);
}
#endif
return lock;