[libvirt] [PATCH] virconf: properly set the end of content

[Jim Fehlig]

There was a recent report of the xen-xl converter not handling
config files missing an ending newline

https://www.redhat.com/archives/libvir-list/2017-October/msg01353.html

Commit 3cc2a9e0 fixed a similar problem when parsing content of a
file but missed parsing in-memory content. But AFAICT, the better
fix is to properly set the end of the content when initializing the
virConfParserCtxt in virConfParse().

This commit reverts the part of 3cc2a9e0 that appends a newline to
files missing it, and fixes setting the end of content when
initializing virConfParserCtxt. A test is also added to check
parsing in-memory content missing an ending newline.

Signed-off-by: Jim Fehlig <jfehlig at suse.com>
---
 src/util/virconf.c  | 13 ++--------
 tests/virconftest.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 11 deletions(-)

diff --git a/src/util/virconf.c b/src/util/virconf.c
index 39c2bd917..a82a509ca 100644
--- a/src/util/virconf.c
+++ b/src/util/virconf.c
@@ -705,7 +705,7 @@ virConfParse(const char *filename, const char *content, int len,
 
     ctxt.filename = filename;
     ctxt.base = ctxt.cur = content;
-    ctxt.end = content + len - 1;
+    ctxt.end = content + len;
     ctxt.line = 1;
 
     ctxt.conf = virConfCreate(filename, flags);
@@ -745,7 +745,7 @@ virConfReadFile(const char *filename, unsigned int flags)
 {
     char *content;
     int len;
-    virConfPtr conf = NULL;
+    virConfPtr conf;
 
     VIR_DEBUG("filename=%s", NULLSTR(filename));
 
@@ -757,17 +757,8 @@ virConfReadFile(const char *filename, unsigned int flags)
     if ((len = virFileReadAll(filename, MAX_CONFIG_FILE_SIZE, &content)) < 0)
         return NULL;
 
-    if (len && len < MAX_CONFIG_FILE_SIZE && content[len - 1] != '\n') {
-        VIR_DEBUG("appending newline to busted config file %s", filename);
-        if (VIR_REALLOC_N(content, len + 2) < 0)
-            goto cleanup;
-        content[len++] = '\n';
-        content[len] = '\0';
-    }
-
     conf = virConfParse(filename, content, len, flags);
 
- cleanup:
     VIR_FREE(content);
 
     return conf;
diff --git a/tests/virconftest.c b/tests/virconftest.c
index a8b18bae0..3cf0df3ac 100644
--- a/tests/virconftest.c
+++ b/tests/virconftest.c
@@ -77,6 +77,72 @@ static int testConfRoundTrip(const void *opaque)
 }
 
 
+static int testConfMemoryNoNewline(const void *opaque ATTRIBUTE_UNUSED)
+{
+    const char *srcdata = \
+        "ullong = '123456789'\n" \
+        "string = 'foo'\n" \
+        "uint = 12345";
+
+    virConfPtr conf = virConfReadString(srcdata, 0);
+    int ret = -1;
+    virConfValuePtr val;
+    unsigned long long llvalue;
+    char *str = NULL;
+    int uintvalue;
+
+    if (!conf)
+        return -1;
+
+    if (!(val = virConfGetValue(conf, "ullong")))
+        goto cleanup;
+
+    if (val->type != VIR_CONF_STRING)
+        goto cleanup;
+
+    if (virStrToLong_ull(val->str, NULL, 10, &llvalue) < 0)
+        goto cleanup;
+
+    if (llvalue != 123456789) {
+        fprintf(stderr, "Expected '123' got '%llu'\n", llvalue);
+        goto cleanup;
+    }
+
+    if (virConfGetValueType(conf, "string") !=
+        VIR_CONF_STRING) {
+        fprintf(stderr, "expected a string for 'string'\n");
+        goto cleanup;
+    }
+
+    if (virConfGetValueString(conf, "string", &str) < 0)
+        goto cleanup;
+
+    if (STRNEQ_NULLABLE(str, "foo")) {
+        fprintf(stderr, "Expected 'foo' got '%s'\n", str);
+        goto cleanup;
+    }
+
+    if (virConfGetValueType(conf, "uint") != VIR_CONF_ULLONG) {
+        fprintf(stderr, "expected an unsigned long for 'uint'\n");
+        goto cleanup;
+    }
+
+    if (virConfGetValueInt(conf, "uint", &uintvalue) < 0)
+        goto cleanup;
+
+    if (uintvalue != 12345) {
+        fprintf(stderr, "Expected 12345 got %ud\n", uintvalue);
+        goto cleanup;
+    }
+
+    ret = 0;
+ cleanup:
+    VIR_FREE(str);
+    virConfFree(conf);
+    return ret;
+}
+
+
 static int testConfParseInt(const void *opaque ATTRIBUTE_UNUSED)
 {
     const char *srcdata = \
@@ -414,6 +480,9 @@ mymain(void)
     if (virTestRun("no-newline", testConfRoundTrip, "no-newline") < 0)
         ret = -1;
 
+    if (virTestRun("memory-no-newline", testConfMemoryNoNewline, NULL) < 0)
+        ret = -1;
+
     if (virTestRun("int", testConfParseInt, NULL) < 0)
         ret = -1;
 
-- 
2.14.2