From 4c301883a5a94a9a186a1bb1d45d234db4db7c88 Mon Sep 17 00:00:00 2001
From: Dominik Neudert-Schulz <dominikns@bachtechnology.com>
Date: Wed, 30 Jun 2021 14:13:46 +0200
Subject: [PATCH] fix rpmbuild failure because of wrong symlink length on some
 filesystems

---
 build/files.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/build/files.c b/build/files.c
index f8153ad2b5..571b502e91 100644
--- a/build/files.c
+++ b/build/files.c
@@ -1363,6 +1363,8 @@ static rpmRC addFile(FileList fl, const char * diskPath,
 {
     size_t plen = strlen(diskPath);
     char buf[plen + 1];
+    char linkPath[PATH_MAX];
+    ssize_t linkLen;
     const char *cpioPath;
     struct stat statbuf;
     mode_t fileMode;
@@ -1459,6 +1461,20 @@ static rpmRC addFile(FileList fl, const char * diskPath,
     fileUid = statp->st_uid;
     fileGid = statp->st_gid;
 
+    if (S_ISLNK(fileMode)) {
+        /* stat's man page states that statp->st_size should equal the length of
+           the pointed-to path. On some filesystem a wrong size is reported.
+           So, explicitly get the length here. */
+        linkLen = readlink(diskPath, linkPath, sizeof(linkPath));
+        if ((linkLen < 0) || (linkLen >= sizeof(linkPath))) {
+            rpmlog(RPMLOG_ERR,
+               "Symbolic link too long or corrupt: %s\n",
+               diskPath);
+            goto exit;
+        }
+        statp->st_size = linkLen;
+    }
+
     /* Explicit %attr() always wins */
     if (fl->cur.ar.ar_fmodestr) {
 	if (S_ISLNK(fileMode)) {