tests: Fix tools::is_hdd unit tests

.github/workflows/build.yml

@@ -213,6 +213,8 @@ jobs:
       run: sudo ${{env.APT_INSTALL_LINUX}}
     - name: install Python dependencies
       run: pip install requests psutil monotonic zmq deepdiff
+    - name: create dummy disk drives for testing
+      run: tests/create_test_disks.sh >> $GITHUB_ENV
     - name: tests
       env:
         CTEST_OUTPUT_ON_FAILURE: ON

tests/create_test_disks.sh

@@ -0,0 +1,98 @@
+#!/bin/bash
+
+set -e
+
+LOOP_DEVICE_MAJOR=7
+LOOP_DEVICE_MIN_ID=100
+
+echo_err() {
+    echo "$@" >&2
+}
+
+root_exec() {
+    if [[ $EUID -ne 0 ]]; then
+        ${ROOT_EXEC_CMD:-sudo} "$@"
+    else
+        "$@"
+    fi
+}
+
+create_device_node() {
+    local -r last_id=$(find /dev/ -name 'loop[0-9]*' -printf '%f\n' | sed 's/^loop//' | sort -r -n | head -1)
+    local id=$((last_id + 1))
+    if [[ "$id" -lt "$LOOP_DEVICE_MIN_ID" ]]; then
+        id="$LOOP_DEVICE_MIN_ID"
+    fi
+    local path
+    for (( i=0; i<10; i++ )); do
+        path="/dev/loop$id"
+        if [[ ! -e "$path" ]] && root_exec mknod "$path" b "$LOOP_DEVICE_MAJOR" "$id"; then
+            echo "$path"
+            return 0
+        fi
+        $((id++))
+    done
+    return 1
+}
+
+device_mountpoint() {
+    local -r datadir="$1"
+    local -r dev="$2"
+    if [[ -z "$datadir" || -z "$dev" ]]; then
+        echo_err "Usage: device_mountpoint <data dir> <device>"
+        return 1
+    fi
+    echo "$datadir/mnt-$(basename "$dev")"
+}
+
+create_device() {
+    local -r datadir="$1"
+    if [[ -z "$datadir" ]]; then
+        echo_err "Usage: create_device <data dir>"
+        return 1
+    fi
+    local -r dev=$(create_device_node)
+    local -r fs="$datadir/$(basename "$dev").vhd"
+    local -r mountpoint=$(device_mountpoint "$datadir" "$dev")
+    echo_err
+    echo_err "# Device $dev"
+    dd if=/dev/zero of="$fs" bs=64K count=128 >/dev/null 2>&1
+    root_exec losetup "$dev" "$fs"
+    root_exec mkfs.ext4 "$dev" >/dev/null 2>&1
+    mkdir "$mountpoint"
+    root_exec mount "$dev" "$mountpoint"
+    echo "$dev"
+}
+
+# Unused by default, but helpful for local development
+destroy_device() {
+    local -r datadir="$1"
+    local -r dev="$2"
+    if [[ -z "$datadir" || -z "$dev" ]]; then
+        echo_err "Usage: destroy_device <data dir> <device>"
+        return 1
+    fi
+    echo_err "Destroying device $dev"
+    root_exec umount $(device_mountpoint "$datadir" "$dev")
+    root_exec losetup -d "$dev"
+    root_exec rm "$dev"
+}
+
+block_device_path() {
+    device_name=$(basename "$1")
+    device_minor=${device_name/#loop}
+    echo "/sys/dev/block/$LOOP_DEVICE_MAJOR:$device_minor"
+}
+
+tmpdir=$(mktemp --tmpdir -d monerotest.XXXXXXXX)
+echo_err "Creating devices using temporary directory: $tmpdir"
+
+dev_rot=$(create_device "$tmpdir")
+bdev_rot=$(block_device_path "$dev_rot")
+echo 1 | root_exec tee "$bdev_rot/queue/rotational" >/dev/null
+echo MONERO_TEST_DEVICE_HDD=$(device_mountpoint "$tmpdir" "$dev_rot")
+
+dev_ssd=$(create_device "$tmpdir")
+bdev_ssd=$(block_device_path "$dev_ssd")
+echo 0 | root_exec tee "$bdev_ssd/queue/rotational" >/dev/null
+echo MONERO_TEST_DEVICE_SSD=$(device_mountpoint "$tmpdir" "$dev_ssd")

tests/unit_tests/is_hdd.cpp

@@ -1,17 +1,29 @@
 #include "common/util.h"
+#include <cstdlib>
 #include <string>
 #include <gtest/gtest.h>
+#include <boost/optional/optional_io.hpp> /* required to output boost::optional in assertions */
 
 #if defined(__GLIBC__)
-TEST(is_hdd, linux_os_root)
-{
-  std::string path = "/";
-  EXPECT_TRUE(tools::is_hdd(path.c_str()) != boost::none);
+TEST(is_hdd, rotational_drive) {
+  const char *hdd = std::getenv("MONERO_TEST_DEVICE_HDD");
+  if (hdd == nullptr)
+    GTEST_SKIP() << "No rotational disk device configured";
+  EXPECT_EQ(tools::is_hdd(hdd), boost::optional<bool>(true));
 }
-#else
-TEST(is_hdd, unknown_os)
-{
-  std::string path = "";
-  EXPECT_FALSE(tools::is_hdd(path.c_str()) != boost::none);
+
+TEST(is_hdd, ssd) {
+  const char *ssd = std::getenv("MONERO_TEST_DEVICE_SSD");
+  if (ssd == nullptr)
+    GTEST_SKIP() << "No SSD device configured";
+  EXPECT_EQ(tools::is_hdd(ssd), boost::optional<bool>(false));
+}
+
+TEST(is_hdd, unknown_attrs) {
+  EXPECT_EQ(tools::is_hdd("/dev/null"), boost::none);
 }
 #endif
+TEST(is_hdd, stability)
+{
+  EXPECT_NO_THROW(tools::is_hdd(""));
+}