From 54e45e125435b4a4c133547b7ee9b3c8667ef7dc Mon Sep 17 00:00:00 2001
From: Justin Bedo <cu@cua0.org>
Date: Wed, 5 Jan 2022 13:09:53 +1100
Subject: fix bug in strip-store-paths

also taking the opportunity to simplify the rewriteOutput
function and handle filenames with spaces
---
 default.nix                             | 8 +-------
 strip-store-paths/strip-store-paths.zig | 9 ++++++++-
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/default.nix b/default.nix
index 04fd62c..3ec0450 100644
--- a/default.nix
+++ b/default.nix
@@ -151,13 +151,7 @@ let
           stripCommand = ''
 
             function rewriteOutput {
-              if [ -f ''${!1} ] ; then
-                strip-store-paths ''${!1}
-              else
-                for f in $(find ''${!1} -type f) ; do
-                  strip-store-paths $f
-                done
-              fi
+              find ''${!1} -type f -print0 | xargs -0 -n1 strip-store-paths
             }
             for o in $outputs ; do
               rewriteOutput $o
diff --git a/strip-store-paths/strip-store-paths.zig b/strip-store-paths/strip-store-paths.zig
index 243bd4a..9ded95e 100644
--- a/strip-store-paths/strip-store-paths.zig
+++ b/strip-store-paths/strip-store-paths.zig
@@ -7,6 +7,9 @@ pub const File = struct {
 
     pub fn init(fd: std.os.fd_t, allocator: std.mem.Allocator) !File {
         var stats = try std.os.fstat(fd);
+        if (stats.size == 0) {
+            return error.ZeroFile;
+        }
         var ptr = try std.os.mmap(null, @intCast(usize, stats.size), std.os.PROT.READ | std.os.PROT.WRITE, std.os.MAP.SHARED, fd, 0);
         return File{ .ptr = ptr, .len = @intCast(u64, stats.size), .allocator = allocator };
     }
@@ -32,7 +35,11 @@ pub fn main() !void {
 
     // mmap input
     var fd = try std.os.open(path, std.os.O.RDWR, 0);
-    var input = try File.init(fd, allocator);
+    var input = File.init(fd, allocator) catch |err| if (err == error.ZeroFile) {
+        return;
+    } else {
+        return err;
+    };
     defer input.deinit();
 
     // search for /nix/store
-- 
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