Fix 4 test failures from Proxmox VM report

1. converter panic (5 unit tests): "FIXME_CHECKSUM".repeat(4) is only
   56 chars but was sliced to [..64], causing index-out-of-bounds panic.
   Both crux.rs and gentoo.rs converters now use "a".repeat(64) as the
   placeholder checksum instead.

2. dpack list/check exit code 1: these commands call PackageDb::open()
   which tries to create /var/lib/dpack/db — fails without root.
   Test runner now creates a temp dpack.conf pointing at a writable
   temp directory with repos symlinked from the project. Also added
   search and info smoke tests.

3. host.ovmf: not a code bug — edk2-ovmf just needs to be installed
   on the test VM (sudo pacman -S edk2-ovmf --noconfirm).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/dpack/src/converter/crux.rs

@@ -119,7 +119,7 @@ pub fn parse_pkgfile(content: &str) -> Result<PackageDefinition> {
         },
         source: SourceInfo {
             url: template_url,
-            sha256: "FIXME_CHECKSUM".repeat(4)[..64].to_string(), // Placeholder
+            sha256: "a".repeat(64), // Placeholder
             git: String::new(),
             branch: String::new(),
             tag: String::new(),

src/dpack/src/converter/gentoo.rs

@@ -139,7 +139,7 @@ pub fn parse_ebuild(content: &str, filename: &str) -> Result<PackageDefinition>
         },
         source: SourceInfo {
             url: source_url,
-            sha256: "FIXME_CHECKSUM".repeat(4)[..64].to_string(),
+            sha256: "a".repeat(64),
             git: String::new(),
             branch: String::new(),
             tag: String::new(),

tests/proxmox/run-in-vm.sh

@@ -175,13 +175,58 @@ fi
 # Unit tests
 timed "dpack.unit_tests" cargo test || true
 
-# CLI smoke test
+# CLI smoke tests — use a temp config so we don't need root for /var/lib/dpack
 DPACK="${PROJECT_ROOT}/src/dpack/target/release/dpack"
 if [ -x "$DPACK" ]; then
     $DPACK --version &>/dev/null && record "dpack.cli.version" "pass" || record "dpack.cli.version" "fail"
     $DPACK --help &>/dev/null && record "dpack.cli.help" "pass" || record "dpack.cli.help" "fail"
-    $DPACK list &>/dev/null && record "dpack.cli.list" "pass" || record "dpack.cli.list" "fail" "Exit code $?"
+
-    $DPACK check &>/dev/null && record "dpack.cli.check" "pass" || record "dpack.cli.check" "fail" "Exit code $?"
+    # Create a temp dpack config pointing at writable directories
+    DPACK_TEST_DIR=$(mktemp -d /tmp/dpack-test-XXXXX)
+    mkdir -p "${DPACK_TEST_DIR}"/{db,repos,sources,build}
+    # Symlink repos from the project
+    ln -sf "${PROJECT_ROOT}/src/repos/core" "${DPACK_TEST_DIR}/repos/core"
+    ln -sf "${PROJECT_ROOT}/src/repos/extra" "${DPACK_TEST_DIR}/repos/extra"
+    ln -sf "${PROJECT_ROOT}/src/repos/desktop" "${DPACK_TEST_DIR}/repos/desktop"
+    ln -sf "${PROJECT_ROOT}/src/repos/gaming" "${DPACK_TEST_DIR}/repos/gaming"
+
+    cat > "${DPACK_TEST_DIR}/dpack.conf" << DCONF
+[paths]
+db_dir = "${DPACK_TEST_DIR}/db"
+repo_dir = "${DPACK_TEST_DIR}/repos"
+source_dir = "${DPACK_TEST_DIR}/sources"
+build_dir = "${DPACK_TEST_DIR}/build"
+
+[[repos]]
+name = "core"
+path = "${DPACK_TEST_DIR}/repos/core"
+priority = 0
+
+[[repos]]
+name = "extra"
+path = "${DPACK_TEST_DIR}/repos/extra"
+priority = 10
+
+[[repos]]
+name = "desktop"
+path = "${DPACK_TEST_DIR}/repos/desktop"
+priority = 20
+
+[[repos]]
+name = "gaming"
+path = "${DPACK_TEST_DIR}/repos/gaming"
+priority = 30
+DCONF
+
+    DPACK_CMD="$DPACK --config ${DPACK_TEST_DIR}/dpack.conf"
+    $DPACK_CMD list &>/dev/null && record "dpack.cli.list" "pass" || record "dpack.cli.list" "fail" "Exit code $?"
+    $DPACK_CMD check &>/dev/null && record "dpack.cli.check" "pass" || record "dpack.cli.check" "fail" "Exit code $?"
+
+    # Test search finds packages in our repos
+    $DPACK_CMD search zlib 2>/dev/null | grep -q "zlib" && record "dpack.cli.search" "pass" || record "dpack.cli.search" "fail" "zlib not found"
+    $DPACK_CMD info zlib 2>/dev/null | grep -q "Compression" && record "dpack.cli.info" "pass" || record "dpack.cli.info" "fail" "info zlib failed"
+
+    rm -rf "${DPACK_TEST_DIR}"
 fi
 
 cd "${PROJECT_ROOT}"