1 files changed, 66 insertions, 0 deletions
diff --git a/pkgs/applications/audio/spotify/preload.c b/pkgs/applications/audio/spotify/preload.c
new file mode 100644
index 000000000000..42d482c21e43
--- /dev/null
+++ b/pkgs/applications/audio/spotify/preload.c
@@ -0,0 +1,66 @@
+/* Spotify looks for its theme data in /usr/share/spotify/theme.  This
+   LD_PRELOAD library intercepts open() and stat() calls to redirect
+   them to the corresponding location in $out. */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <limits.h>
+
+char themeDir [] = "/usr/share/spotify/theme";
+char realThemeDir [] = OUT "/share/spotify/theme";
+
+const char * rewrite(const char * path, char * buf)
+{
+    if (strncmp(path, themeDir, sizeof(themeDir) - 1) != 0) return path;
+    if (snprintf(buf, PATH_MAX, "%s%s", realThemeDir, path + sizeof(themeDir) - 1) >= PATH_MAX)
+        abort();
+    return buf;
+}
+
+int open(const char *path, int flags, ...)
+{
+    char buf[PATH_MAX];
+    int (*_open) (const char *, int, mode_t) = dlsym(RTLD_NEXT, "open");
+    mode_t mode = 0;
+    if (flags & O_CREAT) {
+        va_list ap;
+        va_start(ap, flags);
+        mode = va_arg(ap, mode_t);
+        va_end(ap);
+    }
+    return _open(rewrite(path, buf), flags, mode);
+}
+
+int open64(const char *path, int flags, ...)
+{
+    char buf[PATH_MAX];
+    int (*_open64) (const char *, int, mode_t) = dlsym(RTLD_NEXT, "open64");
+    mode_t mode = 0;
+    if (flags & O_CREAT) {
+        va_list ap;
+        va_start(ap, flags);
+        mode = va_arg(ap, mode_t);
+        va_end(ap);
+    }
+    return _open64(rewrite(path, buf), flags, mode);
+}
+
+int __xstat64(int ver, const char *path, struct stat64 *st)
+{
+    char buf[PATH_MAX];
+    int (*___xstat64) (int ver, const char *, struct stat64 *) = dlsym(RTLD_NEXT, "__xstat64");
+    return ___xstat64(ver, rewrite(path, buf), st);
+}
+
+int access(const char *path, int mode)
+{
+    char buf[PATH_MAX];
+    int (*_access) (const char *path, int mode) = dlsym(RTLD_NEXT, "access");
+    return _access(rewrite(path, buf), mode);
+}