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Re-implement the recursive directory copy

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The recursive copy from the stl doesn’t exactly do what we need because
1. It doesn’t delete things as we go
2. It doesn’t keep the mtime, which change the nars

So re-implement it ourselves. A bit dull, but that way we have what we want
This commit is contained in:
Théophane Hufschmitt 2022-03-18 14:25:56 +01:00 committed by Théophane Hufschmitt
parent 6f89fb6008
commit c5db1821a9
1 changed files with 50 additions and 2 deletions
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52
src/libutil/filesystem.cc
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@ -43,6 +43,53 @@ void replaceSymlink(const Path & target, const Path & link,
}
}
void setWriteTime(const fs::path & p, const struct stat & st)
{
struct timeval times[2];
times[0] = {
.tv_sec = st.st_atime,
.tv_usec = 0,
};
times[1] = {
.tv_sec = st.st_mtime,
.tv_usec = 0,
};
warn("Setting the mtime of %s to %d", p.c_str(), st.st_mtim.tv_sec);
if (lutimes(p.c_str(), times) != 0)
throw SysError("changing modification time of '%s'", p);
}
void copy(const fs::directory_entry & from, const fs::path & to, bool andDelete)
{
// TODO: Rewrite the `is_*` to use `symlink_status()`
auto statOfFrom = lstat(from.path().c_str());
auto fromStatus = from.symlink_status();
// Mark the directory as writable so that we can delete its children
if (andDelete && fs::is_directory(fromStatus)) {
fs::permissions(from.path(), fs::perms::owner_write, fs::perm_options::add | fs::perm_options::nofollow);
}
if (fs::is_symlink(fromStatus) || fs::is_regular_file(fromStatus)) {
fs::copy(from.path(), to, fs::copy_options::copy_symlinks | fs::copy_options::overwrite_existing);
} else if (fs::is_directory(fromStatus)) {
fs::create_directory(to);
for (auto & entry : fs::directory_iterator(from.path())) {
copy(entry, to / entry.path().filename(), andDelete);
}
} else {
throw Error("file '%s' has an unsupported type", from.path());
}
setWriteTime(to, statOfFrom);
if (andDelete) {
if (!fs::is_symlink(fromStatus))
fs::permissions(from.path(), fs::perms::owner_write, fs::perm_options::add | fs::perm_options::nofollow);
fs::remove(from.path());
}
}
void moveFile(const Path & oldName, const Path & newName)
{
auto oldPath = fs::path(oldName);
@ -51,8 +98,9 @@ void moveFile(const Path & oldName, const Path & newName)
fs::rename(oldPath, newPath);
} catch (fs::filesystem_error & e) {
if (e.code().value() == EXDEV) {
fs::copy(oldName, newName, fs::copy_options::copy_symlinks);
fs::remove_all(oldName);
fs::remove(newPath);
warn("Copying %s to %s", oldName, newName);
copy(fs::directory_entry(oldPath), newPath, true);
}
}
}