2 files changed, 20 insertions, 18 deletions
diff --git a/strip-store-paths/default.nix b/strip-store-paths/default.nix
index 40fb546..473df87 100644
--- a/strip-store-paths/default.nix
+++ b/strip-store-paths/default.nix
@@ -4,14 +4,15 @@ stdenv.mkDerivation {
   name = "strip-store-paths";
   nativeBuildInputs = [ zig ];
   src = ./strip-store-paths.zig;
+  
+  XDG_CACHE_HOME = "Cache";
 
   unpackPhase = ''
     cp $src strip-store-paths.zig
   '';
 
   buildPhase = ''
-    export HOME=$TMPDIR
-    zig build-exe -OReleaseFast strip-store-paths.zig
+    zig build-exe -OReleaseFast -mcpu=baseline strip-store-paths.zig
   '';
 
   installPhase = ''
diff --git a/strip-store-paths/strip-store-paths.zig b/strip-store-paths/strip-store-paths.zig
index e55aeaf..64c9036 100644
--- a/strip-store-paths/strip-store-paths.zig
+++ b/strip-store-paths/strip-store-paths.zig
@@ -5,17 +5,17 @@ pub const File = struct {
     len: u64,
     allocator: std.mem.Allocator,
 
-    pub fn init(fd: std.os.fd_t, allocator: std.mem.Allocator) !File {
-        const stats = try std.os.fstat(fd);
+    pub fn init(fd: std.posix.fd_t, allocator: std.mem.Allocator) !File {
+        const stats = try std.posix.fstat(fd);
         if (stats.size == 0) {
             return error.ZeroFile;
         }
-        const ptr = try std.os.mmap(null, @intCast(stats.size), std.os.PROT.READ | std.os.PROT.WRITE, std.os.MAP.SHARED, fd, 0);
+        const ptr = try std.posix.mmap(null, @intCast(stats.size), std.posix.PROT.READ | std.posix.PROT.WRITE, .{ .TYPE = .SHARED}, fd, 0);
         return File{ .ptr = ptr, .len = @intCast(stats.size), .allocator = allocator };
     }
 
     pub fn deinit(self: *File) void {
-        std.os.munmap(self.ptr);
+        std.posix.munmap(self.ptr);
         self.ptr = undefined;
         self.len = 0;
     }
@@ -27,30 +27,31 @@ pub fn main() !void {
     const allocator = arena.allocator();
 
     const args = try std.process.argsAlloc(allocator);
-    if (args.len != 2) {
+    if (args.len == 1) {
+        std.process.exit(0);
+    } else if (args.len > 2) {
         std.debug.print("usage: {s} file\n", .{args[0]});
         std.process.exit(1);
     }
     const path = args[1];
 
     // mmap input
-    var file = try std.fs.cwd().openFile(path, .{ .mode = .read_write });
-    defer file.close();
-    const len = try file.getEndPos();
-    if (len == 0) {
-      return;
-    }
-    const ptr = try std.posix.mmap(null, len, std.posix.PROT.READ | std.posix.PROT.WRITE, .{ .TYPE = .SHARED }, file.handle, 0);
-    defer std.posix.munmap(ptr);
+    const fd = try std.posix.open(path, .{.ACCMODE = .RDWR, .CREAT = false, .TRUNC = false}, 0);
+    var input = File.init(fd, allocator) catch |err| if (err == error.ZeroFile) {
+        return;
+    } else {
+        return err;
+    };
+    defer input.deinit();
 
     // search for /nix/store
     var i: usize = 0;
     const needle = "/nix/store/";
-    while (std.mem.indexOfPos(u8, ptr, i, needle)) |idx| {
+    while (std.mem.indexOfPos(u8, input.ptr, i, needle)) |idx| {
         i = idx + needle.len;
         const j = i + 32; // pos of - in a true path
-        if (j < len and ptr[j] == '-') {
-            std.mem.copyForwards(u8, ptr[i..], "00000000000000000000000000000000");
+        if (j < input.len and input.ptr[j] == '-') {
+            @memcpy(input.ptr[i..], "00000000000000000000000000000000");
         }
     }
 }