[PATCH v2 1/7] tests: qemu: Add helper code to lookup most recent capability file

[Peter Krempa <pkrempa@xxxxxxxxxx>]

The helper iterates the directory with files for the capability test and
looks up the most recent one for the given architecture. This will allow
testing against the newest qemu capabilities so that we can catch
regressions in behaviour more easily.

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 tests/testutilsqemu.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/testutilsqemu.h |  5 +++
 2 files changed, 99 insertions(+)

diff --git a/tests/testutilsqemu.c b/tests/testutilsqemu.c
index 9671a46f12..9dbcee6e3b 100644
--- a/tests/testutilsqemu.c
+++ b/tests/testutilsqemu.c
@@ -674,3 +674,97 @@ testQemuCapsSetGIC(virQEMUCapsPtr qemuCaps,
 }

 #endif
+
+
+static bool
+testQemuCapsIsNewerVersion(char **cur,
+                           char **max)
+{
+    size_t i;
+    int rc;
+
+    for (i = 0; i < 3; i++) {
+        rc = strlen(cur[i]) - strlen(max[i]);
+
+        if (rc > 0)
+            return true;
+
+        if (rc < 0)
+            return false;
+
+        rc = strcmp(cur[i], max[i]);
+
+        if (rc > 0)
+            return true;
+
+        if (rc < 0)
+            return false;
+    }
+
+    return false;
+}
+
+
+char *
+testQemuGetNewestCapsForArch(const char *dirname,
+                             const char *arch,
+                             const char *suffix)
+{
+    struct dirent *ent;
+    int rc;
+    DIR *dir = NULL;
+    char *ret = NULL;
+    const char *tmp;
+    char **max = NULL;
+    size_t nmax = 0;
+    const char *maxname = NULL;
+    char **cur = NULL;
+    size_t ncur = 0;
+
+    if (virDirOpen(&dir, dirname) < 0)
+        goto cleanup;
+
+    while ((rc = virDirRead(dir, &ent, dirname)) > 0) {
+        virStringListFreeCount(cur, ncur);
+        cur = NULL;
+        ncur = 0;
+
+        if (!(tmp = STRSKIP(ent->d_name, "caps_")))
+            continue;
+
+        if (!strstr(tmp, suffix) || !strstr(tmp, arch))
+            continue;
+
+        if (!(cur = virStringSplitCount(tmp, ".", 4, &ncur)))
+            goto cleanup;
+
+        if (ncur != 4) {
+            VIR_TEST_DEBUG("skipping caps file '%s'\n", ent->d_name);
+            continue;
+        }
+
+        if (!max || testQemuCapsIsNewerVersion(cur, max)) {
+            VIR_STEAL_PTR(max, cur);
+            maxname = ent->d_name;
+            nmax = ncur;
+            ncur = 0;
+        }
+    }
+
+    if (rc < 0)
+        goto cleanup;
+
+    if (!maxname) {
+        VIR_TEST_VERBOSE("failed to find capabilities for '%s' in '%s'\n",
+                         arch, dirname);
+        goto cleanup;
+    }
+
+    ignore_value(virAsprintf(&ret, "%s/%s", dirname, maxname));
+
+ cleanup:
+    virStringListFreeCount(max, nmax);
+    virStringListFreeCount(cur, ncur);
+    virDirClose(&dir);
+    return ret;
+}
diff --git a/tests/testutilsqemu.h b/tests/testutilsqemu.h
index 7ae8324933..6490db4b95 100644
--- a/tests/testutilsqemu.h
+++ b/tests/testutilsqemu.h
@@ -39,4 +39,9 @@ int qemuTestCapsCacheInsert(virFileCachePtr cache,

 int testQemuCapsSetGIC(virQEMUCapsPtr qemuCaps,
                        int gic);
+
+char *testQemuGetNewestCapsForArch(const char *dirname,
+                                   const char *arch,
+                                   const char *suffix);
+
 #endif
-- 
2.16.2

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