pipeline-snapshot: Use user_cache_dir from the GLib

The 'dirs' crate doesn't behave the same leading to incompatibility

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1956>

Cargo.lock

@@ -1657,27 +1657,6 @@ dependencies = [
  "subtle",
 ]
 
-[[package]]
-name = "dirs"
-version = "6.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3e8aa94d75141228480295a7d0e7feb620b1a5ad9f12bc40be62411e38cce4e"
-dependencies = [
- "dirs-sys",
-]
-
-[[package]]
-name = "dirs-sys"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e01a3366d27ee9890022452ee61b2b63a67e6f13f58900b651ff5665f0bb1fab"
-dependencies = [
- "libc",
- "option-ext",
- "redox_users",
- "windows-sys 0.59.0",
-]
-
 [[package]]
 name = "displaydoc"
 version = "0.2.5"
@@ -3236,7 +3215,6 @@ dependencies = [
  "async-tungstenite",
  "atomic_refcell",
  "chrono",
- "dirs",
  "etherparse",
  "futures",
  "gst-plugin-version-helper",
@@ -4781,16 +4759,6 @@ version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8355be11b20d696c8f18f6cc018c4e372165b1fa8126cef092399c9951984ffa"
 
-[[package]]
-name = "libredox"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0ff37bd590ca25063e35af745c343cb7a0271906fb7b37e4813e8f79f00268d"
-dependencies = [
- "bitflags 2.8.0",
- "libc",
-]
-
 [[package]]
 name = "librespot-audio"
 version = "0.6.0"
@@ -5492,12 +5460,6 @@ dependencies = [
  "vcpkg",
 ]
 
-[[package]]
-name = "option-ext"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
-
 [[package]]
 name = "option-operations"
 version = "0.5.0"
@@ -6314,17 +6276,6 @@ dependencies = [
  "bitflags 2.8.0",
 ]
 
-[[package]]
-name = "redox_users"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd6f9d3d47bdd2ad6945c5015a226ec6155d0bcdfd8f7cd29f86b71f8de99d2b"
-dependencies = [
- "getrandom 0.2.15",
- "libredox",
- "thiserror 2.0.11",
-]
-
 [[package]]
 name = "regex"
 version = "1.11.1"

utils/tracers/Cargo.toml

@@ -15,7 +15,6 @@ regex = "1"
 atomic_refcell = "0.1"
 pcap-file = "1.1.1"
 etherparse = "0.16.0"
-dirs = "6"
 chrono = "0.4.35"
 walkdir = "2"
 tokio = { version = "1", features = ["macros", "rt-multi-thread"] }

utils/tracers/src/pipeline_snapshot/imp.rs

@@ -71,7 +71,7 @@
 use futures::prelude::*;
 use std::collections::HashMap;
 use std::io::Write;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use std::str::FromStr;
 use std::sync::{Arc, Mutex, RwLock};
 use tokio::runtime;
@@ -230,7 +230,7 @@ impl Settings {
     fn set_xdg_cache(&mut self, xdg_cache: bool) {
         self.xdg_cache = xdg_cache;
         if xdg_cache {
-            let mut path = dirs::cache_dir().expect("Failed to find cache directory");
+            let mut path = gst::glib::user_cache_dir();
             path.push("gstreamer-dots");
             self.dot_dir = path.to_str().map(|s| s.to_string());
         }
@@ -630,19 +630,32 @@ impl PipelineSnapshot {
                 settings.dot_prefix.as_ref().map_or("", |s| s.as_str()),
                 pipeline.name(),
             );
-            gst::debug!(CAT, imp = self, "Writing {}", dot_path);
+
-            match std::fs::File::create(&dot_path) {
-                Ok(mut f) => {
             let data = pipeline.debug_to_dot_data(gst::DebugGraphDetails::all());
-                    if let Err(e) = f.write_all(data.as_bytes()) {
+
+            if let Err(e) = self.write_dot_file_atomically(Path::new(&dot_path), data.as_bytes()) {
                 gst::warning!(CAT, imp = self, "Failed to write {}: {}", dot_path, e);
             }
         }
-                Err(e) => {
-                    gst::warning!(CAT, imp = self, "Failed to create {}: {}", dot_path, e);
-                }
     }
+
+    fn write_dot_file_atomically(&self, path: &Path, data: &[u8]) -> std::io::Result<()> {
+        // Create a temporary file in the same directory
+        let tmp_path = path.with_extension("dot.tmp");
+
+        // Write data to temporary file
+        {
+            let mut tmp_file = std::fs::File::create(&tmp_path)?;
+            tmp_file.write_all(data)?;
+
+            // Ensure all data is written to disk
+            tmp_file.sync_all()?;
         }
+
+        // Atomically rename temporary file to target path
+        std::fs::rename(tmp_path, path)?;
+
+        Ok(())
     }
 
     #[cfg(unix)]