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tighten up systemd launch check

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This commit is contained in:
Jeffrey C. Ollie
2024-07-29 16:50:59 -05:00
parent 32fd4097f8
commit 99e447898b
1 changed files with 32 additions and 9 deletions
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41
src/os/systemd.zig
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@ -39,20 +39,43 @@ pub fn launchedBySystemd() bool {
// a user systemd daemon. Do that by checking the `/proc/<ppid>/exe` symlink
// to see if it ends with `/systemd`.
var path_buf: [std.fs.max_path_bytes]u8 = undefined;
const path = std.fmt.bufPrint(&path_buf, "/proc/{d}/exe", .{ppid}) catch {
log.err("unable to format path to exe {d}", .{ppid});
var exe_path_buf: [std.fs.max_path_bytes]u8 = undefined;
const exe_path = std.fmt.bufPrint(&exe_path_buf, "/proc/{d}/exe", .{ppid}) catch {
log.err("unable to format path to exe for pid {d}", .{ppid});
break :linux false;
};
var link_buf: [std.fs.max_path_bytes]u8 = undefined;
const link = std.fs.readLinkAbsolute(path, &link_buf) catch {
log.err("unable to read link '{s}'", .{path});
var exe_link_buf: [std.fs.max_path_bytes]u8 = undefined;
const exe_link = std.fs.readLinkAbsolute(exe_path, &exe_link_buf) catch {
log.err("unable to read link '{s}'", .{exe_path});
// Some systems prohibit access to /proc/<pid>/exe for some
// reason so don't fail if we can't read the link.
break :linux true;
// reason so fall back to reading /proc/<pid>/comm and see if it
// is equal to "systemd".
var comm_path_buf: [std.fs.max_path_bytes]u8 = undefined;
const comm_path = std.fmt.bufPrint(&comm_path_buf, "/proc/{d}/comm", .{ppid}) catch {
log.err("unable to format comm path for pid {d}", .{ppid});
break :linux false;
};
const comm_file = std.fs.openFileAbsolute(comm_path, .{ .mode = .read_only }) catch {
log.err("unable to open '{s}' for reading", .{comm_path});
break :linux false;
};
defer comm_file.close();
var comm_data_buf: [std.fs.MAX_NAME_BYTES]u8 = undefined;
const comm_size = comm_file.readAll(&comm_data_buf) catch {
log.err("problems reading from '{s}'", .{comm_path});
break :linux false;
};
const comm_data = comm_data_buf[0..comm_size];
if (std.mem.eql(u8, comm_data, "systemd")) break :linux true;
break :linux false;
};
if (std.mem.endsWith(u8, link, "/systemd")) break :linux true;
if (std.mem.endsWith(u8, exe_link, "/systemd")) break :linux true;
break :linux false;
},