wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-06-30 11:43:15 +02:00
Code Activity

Support symlinks properly with git-hashing experimental feature

Browse source 
Before, they would not be written to a file `FileSystemObjectSink`
correctly.
This commit is contained in:
John Ericson 2024-02-28 10:56:07 -05:00
parent 864fc85fc8
commit bcb5f235f9
6 changed files with 110 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

75
src/libutil/git.cc
View file

@ -56,31 +56,63 @@ void parseBlob(
FileSystemObjectSink & sink,
const Path & sinkPath,
Source & source,
bool executable,
BlobMode blobMode,
const ExperimentalFeatureSettings & xpSettings)
{
xpSettings.require(Xp::GitHashing);
sink.createRegularFile(sinkPath, [&](auto & crf) {
if (executable)
crf.isExecutable();
unsigned long long size = std::stoi(getStringUntil(source, 0));
unsigned long long size = std::stoi(getStringUntil(source, 0));
auto doRegularFile = [&](bool executable) {
sink.createRegularFile(sinkPath, [&](auto & crf) {
if (executable)
crf.isExecutable();
crf.preallocateContents(size);
crf.preallocateContents(size);
unsigned long long left = size;
std::string buf;
buf.reserve(65536);
unsigned long long left = size;
std::string buf;
buf.reserve(65536);
while (left) {
while (left) {
checkInterrupt();
buf.resize(std::min((unsigned long long)buf.capacity(), left));
source(buf);
crf(buf);
left -= buf.size();
}
});
};
switch (blobMode) {
case BlobMode::Regular:
doRegularFile(false);
break;
case BlobMode::Executable:
doRegularFile(true);
break;
case BlobMode::Symlink:
{
std::string target;
target.resize(size, '0');
target.reserve(size);
for (size_t n = 0; n < target.size();) {
checkInterrupt();
buf.resize(std::min((unsigned long long)buf.capacity(), left));
source(buf);
crf(buf);
left -= buf.size();
n += source.read(
const_cast<char *>(target.c_str()) + n,
target.size() - n);
}
});
sink.createSymlink(sinkPath, target);
break;
}
default:
assert(false);
}
}
void parseTree(
@ -142,7 +174,7 @@ void parse(
FileSystemObjectSink & sink,
const Path & sinkPath,
Source & source,
bool executable,
BlobMode rootModeIfBlob,
std::function<SinkHook> hook,
const ExperimentalFeatureSettings & xpSettings)
{
@ -152,7 +184,7 @@ void parse(
switch (type) {
case ObjectType::Blob:
parseBlob(sink, sinkPath, source, executable, xpSettings);
parseBlob(sink, sinkPath, source, rootModeIfBlob, xpSettings);
break;
case ObjectType::Tree:
parseTree(sink, sinkPath, source, hook, xpSettings);
@ -177,7 +209,7 @@ std::optional<Mode> convertMode(SourceAccessor::Type type)
void restore(FileSystemObjectSink & sink, Source & source, std::function<RestoreHook> hook)
{
parse(sink, "", source, false, [&](Path name, TreeEntry entry) {
parse(sink, "", source, BlobMode::Regular, [&](Path name, TreeEntry entry) {
auto [accessor, from] = hook(entry.hash);
auto stat = accessor->lstat(from);
auto gotOpt = convertMode(stat.type);
@ -275,6 +307,13 @@ Mode dump(
}
case SourceAccessor::tSymlink:
{
auto target = accessor.readLink(path);
dumpBlobPrefix(target.size(), sink, xpSettings);
sink(target);
return Mode::Symlink;
}
case SourceAccessor::tMisc:
default:
throw Error("file '%1%' has an unsupported type", path);