From 8f48e7b1e991375f6b03fac09a4f4416eb2f1afc Mon Sep 17 00:00:00 2001
From: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Date: Mon, 16 Mar 2020 10:49:45 +0100
Subject: [PATCH] util/xmlconfig: add new sha1 application attribute
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This is useful to enable workarounds for applications with a generic name.

For instance all games made with the YoYo game engine have the same executable
name "runner".

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4181>
---
 src/util/00-mesa-defaults.conf |  3 ++-
 src/util/xmlconfig.c           | 29 ++++++++++++++++++++++++++++-
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/src/util/00-mesa-defaults.conf b/src/util/00-mesa-defaults.conf
index 72c415abef8..d078b938021 100644
--- a/src/util/00-mesa-defaults.conf
+++ b/src/util/00-mesa-defaults.conf
@@ -34,7 +34,8 @@ TODO: document the other workarounds.
    <!ATTLIST device       driver CDATA #IMPLIED>
    <!ELEMENT application  (option+)>
    <!ATTLIST application  name CDATA #REQUIRED
-                          executable CDATA #REQUIRED>
+                          executable CDATA #REQUIRED
+                          sha1 CDATA #IMPLIED>
    <!ELEMENT engine       (option+)>
 
    <!-- engine_name_match: A regexp matching the engine name -->
diff --git a/src/util/xmlconfig.c b/src/util/xmlconfig.c
index b036145269e..0ef67ab7b76 100644
--- a/src/util/xmlconfig.c
+++ b/src/util/xmlconfig.c
@@ -46,6 +46,7 @@
 #include "strndup.h"
 #include "xmlconfig.h"
 #include "u_process.h"
+#include "os_file.h"
 
 /* For systems like Hurd */
 #ifndef PATH_MAX
@@ -780,13 +781,39 @@ parseAppAttr(struct OptConfData *data, const XML_Char **attr)
 {
     uint32_t i;
     const XML_Char *exec = NULL;
+    const XML_Char *sha1 = NULL;
     for (i = 0; attr[i]; i += 2) {
         if (!strcmp (attr[i], "name")) /* not needed here */;
         else if (!strcmp (attr[i], "executable")) exec = attr[i+1];
+        else if (!strcmp (attr[i], "sha1")) sha1 = attr[i+1];
         else XML_WARNING("unknown application attribute: %s.", attr[i]);
     }
-    if (exec && strcmp (exec, data->execName))
+    if (exec && strcmp (exec, data->execName)) {
         data->ignoringApp = data->inApp;
+    } else if (sha1) {
+        if (strlen(sha1) != 40) {
+            XML_WARNING("Incorrect sha1 application attribute");
+            data->ignoringApp = data->inApp;
+        } else {
+            size_t len;
+            char* content;
+            char path[PATH_MAX];
+            if (util_get_process_exec_path(path, ARRAY_SIZE(path)) > 0 &&
+                (content = os_read_file(path, &len))) {
+                uint8_t sha1x[20];
+                char sha1s[40];
+                _mesa_sha1_compute(content, len, sha1x);
+                _mesa_sha1_format((char*) sha1s, sha1x);
+                free(content);
+
+                if (memcmp(sha1, sha1s, SHA1_DIGEST_LENGTH)) {
+                    data->ignoringApp = data->inApp;
+                }
+            } else {
+                data->ignoringApp = data->inApp;
+            }
+        }
+    }
 }
 
 /** \brief Parse attributes of an application element. */
-- 
2.30.2