From 1b36cb8e32bab2fac9d5a51a374522069b537342 Mon Sep 17 00:00:00 2001
From: Nikola Forró <nforro@redhat.com>
Date: Apr 20 2024 08:11:21 +0000
Subject: Fix pagure.lib.git.get_changed_files()


Signed-off-by: Nikola Forró <nforro@redhat.com>

---

diff --git a/pagure/lib/git.py b/pagure/lib/git.py
index 1999516..9c2d710 100644
--- a/pagure/lib/git.py
+++ b/pagure/lib/git.py
@@ -1398,6 +1398,10 @@ def get_changed_files(torev, fromrev, abspath):
     """Return files changed between HEAD and BASE.
     Return as a dict with paths as keys and status letters as values.
     """
+    if set(fromrev) == set("0") or set(fromrev) == set("^0"):
+        # get hash of the empty tree
+        cmd = ["hash-object", "-t", "tree", "/dev/null"]
+        fromrev = pagure.lib.git.read_git_output(cmd, abspath)
     cmd = ["diff", "--name-status", "-z", fromrev, torev]
     output = pagure.lib.git.read_git_output(cmd, abspath)
     items = output.split("\0")
diff --git a/tests/test_pagure_lib_git.py b/tests/test_pagure_lib_git.py
index 595de6d..08c932e 100644
--- a/tests/test_pagure_lib_git.py
+++ b/tests/test_pagure_lib_git.py
@@ -3231,6 +3231,12 @@ index 0000000..60f7480
         hash0 = output[0].replace("'", "")
         hash1 = output[1].replace("'", "")
 
+        # Case 0: EMPTY_TREE => hash0
+        output0 = pagure.lib.git.get_changed_files(
+            hash0, "^" + 40 * "0", gitrepo
+        )
+        self.assertEqual(output0, {issue.uid: "A"})
+
         # Case 1: hash1 => hash0
         output1 = pagure.lib.git.get_changed_files(hash0, hash1, gitrepo)
         self.assertEqual(output1, {issue.uid: "M"})