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Factor out nix::maybeLstat

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This function is nice for more than `PosixSourceAccessor`. We can make a
few things simpler with it.

Note that the error logic slightly changes in some of the call sites, in
that we also count `ENOTDIR` and not just `ENOENT` as not having the
file, but that should be fine.
This commit is contained in:
John Ericson 2024-03-29 15:21:10 -04:00
parent eeecbb9c36
commit 8be347afca
5 changed files with 36 additions and 37 deletions
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22
src/libutil/file-system.cc
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@ -174,15 +174,23 @@ struct stat lstat(const Path & path)
}
std::optional<struct stat> maybeLstat(const Path & path)
{
std::optional<struct stat> st{std::in_place};
if (lstat(path.c_str(), &*st))
{
if (errno == ENOENT || errno == ENOTDIR)
st.reset();
else
throw SysError("getting status of '%s'", path);
}
return st;
}
bool pathExists(const Path & path)
{
int res;
struct stat st;
res = lstat(path.c_str(), &st);
if (!res) return true;
if (errno != ENOENT && errno != ENOTDIR)
throw SysError("getting status of %1%", path);
return false;
return maybeLstat(path).has_value();
}
bool pathAccessible(const Path & path)