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-rw-r--r--strip-store-paths/default.nix20
-rw-r--r--strip-store-paths/strip-store-paths.zig57
2 files changed, 77 insertions, 0 deletions
diff --git a/strip-store-paths/default.nix b/strip-store-paths/default.nix
new file mode 100644
index 0000000..40fb546
--- /dev/null
+++ b/strip-store-paths/default.nix
@@ -0,0 +1,20 @@
+{ stdenv, zig }:
+
+stdenv.mkDerivation {
+ name = "strip-store-paths";
+ nativeBuildInputs = [ zig ];
+ src = ./strip-store-paths.zig;
+
+ unpackPhase = ''
+ cp $src strip-store-paths.zig
+ '';
+
+ buildPhase = ''
+ export HOME=$TMPDIR
+ zig build-exe -OReleaseFast strip-store-paths.zig
+ '';
+
+ installPhase = ''
+ install -Dm 755 ./strip-store-paths $out/bin/strip-store-paths
+ '';
+}
diff --git a/strip-store-paths/strip-store-paths.zig b/strip-store-paths/strip-store-paths.zig
new file mode 100644
index 0000000..58d7504
--- /dev/null
+++ b/strip-store-paths/strip-store-paths.zig
@@ -0,0 +1,57 @@
+const std = @import("std");
+
+pub const File = struct {
+ ptr: []align(std.mem.page_size) u8,
+ len: u64,
+ allocator: *std.mem.Allocator,
+
+ pub fn init(fd: std.os.fd_t, allocator: *std.mem.Allocator) !File {
+ var stats = try std.os.fstat(fd);
+ 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
+ };
+ }
+
+ pub fn deinit(self: *File) void {
+ std.os.munmap(self.ptr);
+ self.ptr = undefined;
+ self.len = 0;
+ }
+};
+
+pub fn main() !void {
+ var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+ defer arena.deinit();
+ const allocator = &arena.allocator;
+
+ const args = try std.process.argsAlloc(allocator);
+ if (args.len != 2) {
+ std.debug.print("usage: {s} file\n", .{args[0]});
+ std.os.exit(1);
+ }
+ const path = args[1];
+
+ // mmap input
+ var fd = try std.os.open(path, std.os.O_RDWR, 0);
+ var input = try File.init(fd, allocator);
+ defer input.deinit();
+
+ // search for /nix/store
+ var i: usize = 0;
+ const needle = "/nix/store/";
+ while (std.mem.indexOfPos(u8, input.ptr, i, needle)) |idx| {
+ i = idx + needle.len;
+ var j = i + 32; // pos of - in a true path
+ if (j < input.len and input.ptr[j] == '-') {
+ std.mem.copy(u8, input.ptr[i..], "00000000000000000000000000000000");
+ }
+ }
+}