[S] Change in flashrom[master]: flashrom_tester: Use tempdir crate for test data

[Evan Benn (Code Review)]

Evan Benn has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/68739 )

Change subject: flashrom_tester: Use tempdir crate for test data
......................................................................

flashrom_tester: Use tempdir crate for test data

Use tempdir crate to create a tempdir that is deleted when the tester
closes.

BUG=b:243460685
BRANCH=None
TEST=/usr/bin/flashrom_tester --flashrom_binary /usr/sbin/flashrom host

Change-Id: I14089ef69c3f509cb6f01cc44c7924c244ab7d73
Signed-off-by: Evan Benn 
---
M util/flashrom_tester/Cargo.toml
M util/flashrom_tester/src/tester.rs
M util/flashrom_tester/src/tests.rs
3 files changed, 31 insertions(+), 8 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/39/68739/1

diff --git a/util/flashrom_tester/Cargo.toml b/util/flashrom_tester/Cargo.toml
index b57f04e..364a223 100644
--- a/util/flashrom_tester/Cargo.toml
+++ b/util/flashrom_tester/Cargo.toml
@@ -23,6 +23,7 @@
 rand = "0.6.4"
 serde_json = "1"
 sys-info = "0.9"
+tempdir = "0.3.7"

[build-dependencies]
 built = { version = "0.5", features = ["chrono"] }
diff --git a/util/flashrom_tester/src/tester.rs b/util/flashrom_tester/src/tester.rs
index 6ce3889..8324ade 100644
--- a/util/flashrom_tester/src/tester.rs
+++ b/util/flashrom_tester/src/tester.rs
@@ -46,6 +46,7 @@
 use std::path::PathBuf;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Mutex;
+use tempdir::TempDir;

// type-signature comes from the return type of lib.rs workers.
 type TestError = Box<dyn std::error::Error>;
@@ -67,6 +68,8 @@
     random_data: PathBuf,
     /// The path to a file containing layout data.
     pub layout_file: PathBuf,
+    /// A directory for temporary test data, including the above files.
+    pub tmp_dir: TempDir,
 }

impl<'a> TestEnv<'a> {
@@ -76,14 +79,16 @@
         print_layout: bool,
     ) -> Result<Self, FlashromError> {
         let rom_sz = cmd.get_size()?;
+        let tmp_dir = TempDir::new("flashrom_tester").map_err(|e| e.to_string())?;
         let out = TestEnv {
             chip_type,
             cmd,
             layout: utils::get_layout_sizes(rom_sz)?,
             wp: WriteProtectState::from_hardware(cmd, chip_type)?,
-            original_flash_contents: "/tmp/flashrom_tester_golden.bin".into(),
-            random_data: "/tmp/random_content.bin".into(),
-            layout_file: create_layout_file(rom_sz, Path::new("/tmp/"), print_layout),
+            original_flash_contents: tmp_dir.path().join("flashrom_tester_golden.bin"),
+            random_data: tmp_dir.path().join("random_content.bin"),
+            layout_file: create_layout_file(rom_sz, tmp_dir.path(), print_layout),
+            tmp_dir,
         };

info!("Stashing golden image for verification/recovery on completion");
diff --git a/util/flashrom_tester/src/tests.rs b/util/flashrom_tester/src/tests.rs
index af34208..94fe14d 100644
--- a/util/flashrom_tester/src/tests.rs
+++ b/util/flashrom_tester/src/tests.rs
@@ -43,8 +43,6 @@
 use std::io::BufRead;
 use std::sync::atomic::AtomicBool;

-const ELOG_FILE: &str = "/tmp/elog.file";
-
 /// Iterate over tests, yielding only those tests with names matching filter_names.
 ///
 /// If filter_names is None, all tests will be run. None is distinct from Some(∅);
@@ -223,15 +221,17 @@
     env.ensure_golden()?;

const ELOG_RW_REGION_NAME: &str = "RW_ELOG";
+    let elog_file = env.tmp_dir.path().join("elog.file");
+
     env.cmd
-        .read_region_into_file(ELOG_FILE.as_ref(), ELOG_RW_REGION_NAME)?;
+        .read_region_into_file(&elog_file, ELOG_RW_REGION_NAME)?;

// Just checking for the magic numer
     // TODO: improve this test to read the events
-    if fs::metadata(ELOG_FILE)?.len() < 4 {
+    if fs::metadata(&elog_file)?.len() < 4 {
         return Err("ELOG contained no data".into());
     }
-    let data = fs::read(ELOG_FILE)?;
+    let data = fs::read(&elog_file)?;
     if u32::from_le_bytes(data[0..4].try_into()?) != 0x474f4c45 {
         return Err("ELOG had bad magic number".into());
     }