From f6185d9cdde57ea4e7177be30d30441d1d30cde9 Mon Sep 17 00:00:00 2001
From: Arvin Schnell <aschnell@suse.de>
Date: Tue, 16 Jun 2026 11:30:37 +0200
Subject: [PATCH] - allow to disable all-time unique snapshot numbers

---
 data/default-config        |  5 +++++
 doc/snapper-configs.xml.in | 14 ++++++++++++--
 doc/unique-numbers.txt     |  3 +++
 package/snapper.changes    |  6 ++++++
 snapper/Snapshot.cc        |  7 +++++--
 5 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/data/default-config b/data/default-config
index 5c9585b7..11f331e2 100644
--- a/data/default-config
+++ b/data/default-config
@@ -17,6 +17,11 @@ SPACE_LIMIT="0.5"
 FREE_LIMIT="0.2"
 
 
+# Whether snapshot numbers should be all-time unique. If set to yes, snapshot
+# numbers are not reused even after snapshots are deleted.
+UNIQUE_NUMBERS="yes"
+
+
 # users and groups allowed to work with config
 ALLOW_USERS=""
 ALLOW_GROUPS=""
diff --git a/doc/snapper-configs.xml.in b/doc/snapper-configs.xml.in
index ac03241b..60c6a3ed 100644
--- a/doc/snapper-configs.xml.in
+++ b/doc/snapper-configs.xml.in
@@ -2,13 +2,13 @@
 <refentry id='snapper-configs5'>
 
   <refentryinfo>
-    <date>2022-07-12</date>
+    <date>2026-06-16</date>
   </refentryinfo>
 
   <refmeta>
     <refentrytitle>snapper-configs</refentrytitle>
     <manvolnum>5</manvolnum>
-    <refmiscinfo class='date'>2022-07-12</refmiscinfo>
+    <refmiscinfo class='date'>2026-06-16</refmiscinfo>
     <refmiscinfo class='version'>@VERSION@</refmiscinfo>
     <refmiscinfo class='manual'>Filesystem Snapshot Management</refmiscinfo>
   </refmeta>
@@ -81,6 +81,16 @@
 	</listitem>
       </varlistentry>
 
+      <varlistentry>
+	<term><option>UNIQUE_NUMBERS=<replaceable>boolean</replaceable></option></term>
+	<listitem>
+	  <para>Whether snapshot numbers should be all-time unique. If set to
+	  yes, snapshot numbers are not reused even after snapshots are deleted.</para>
+	  <para>Default value is &quot;yes&quot;.</para>
+	  <para>New in version 0.13.2.</para>
+	</listitem>
+      </varlistentry>
+
       <varlistentry>
 	<term><option>ALLOW_USERS=<replaceable>users</replaceable></option></term>
 	<listitem>
diff --git a/doc/unique-numbers.txt b/doc/unique-numbers.txt
index 0cd12ea9..640bef11 100644
--- a/doc/unique-numbers.txt
+++ b/doc/unique-numbers.txt
@@ -8,3 +8,6 @@ directories when finding the number for the next snapshot.
 
 As a consequence there can temporarily be empty directories in the
 infos directories.
+
+This behavior can be disabled by setting UNIQUE_NUMBERS="no" in the
+configuration.
diff --git a/package/snapper.changes b/package/snapper.changes
index de378f0e..5a6fdfb6 100644
--- a/package/snapper.changes
+++ b/package/snapper.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Jun 16 10:40:03 CEST 2026 - Arvin Schnell <aschnell@suse.com>
+
+- allow to disable all-time unique snapshot numbers (see
+  bsc#1268225)
+
 -------------------------------------------------------------------
 Fri Jun 12 09:47:19 CEST 2026 - Arvin Schnell <aschnell@suse.com>
 
diff --git a/snapper/Snapshot.cc b/snapper/Snapshot.cc
index 71b8ea67..17fd27f6 100644
--- a/snapper/Snapshot.cc
+++ b/snapper/Snapshot.cc
@@ -859,10 +859,13 @@ namespace snapper
 	if (info_dir.unlink("info.xml") < 0)
 	    y2err("unlink 'info.xml' failed errno: " << errno << " (" << stringerror(errno) << ")");
 
-	// We want all-time unique snapshot numbers. So keep directory of snapshot with
+	// If want all-time unique snapshot numbers keep directory of snapshot with
 	// highest number.
 
-	if (snapshot->num != entries.rbegin()->num)
+	bool unique_numbers = true;
+	snapper->getConfigInfo().get_value("UNIQUE_NUMBERS", unique_numbers);
+
+	if (!unique_numbers || snapshot->num != entries.rbegin()->num)
 	{
 	    SDir infos_dir = snapper->openInfosDir();
 	    if (infos_dir.rmdir(decString(snapshot->getNum())) < 0)
-- 
2.47.3