From: Kai Wohlfahrt <kai@vant.ai>
Date: Mon, 22 Jun 2026 07:38:21 +0000 (+0200)
Subject: repart: expand specifiers in MakeSymlinks= target
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7efb51b0e183200b14672d332c521d8a553d7d0b;p=thirdparty%2Fsystemd.git

repart: expand specifiers in MakeSymlinks= target

Previously, they were only expanded in the source part of the arguments.
No other validation is applied to the target component.
---

diff --git a/man/repart.d.xml b/man/repart.d.xml
index 8d53805bb7f..8de04357354 100644
--- a/man/repart.d.xml
+++ b/man/repart.d.xml
@@ -1176,8 +1176,8 @@
     <title>Specifiers</title>
 
     <para>Specifiers may be used in the <varname>Label=</varname>, <varname>CopyBlocks=</varname>,
-    <varname>CopyFiles=</varname>, <varname>MakeDirectories=</varname>, <varname>SplitName=</varname>
-    settings. The following expansions are understood:</para>
+    <varname>CopyFiles=</varname>, <varname>MakeDirectories=</varname>, <varname>MakeSymlinks=</varname>,
+    <varname>SplitName=</varname> settings. The following expansions are understood:</para>
       <table class='specifiers'>
         <title>Specifiers available</title>
         <tgroup cols='3' align='left' colsep='1' rowsep='1'>
diff --git a/src/repart/repart.c b/src/repart/repart.c
index c7814798ad1..561e5bd50bd 100644
--- a/src/repart/repart.c
+++ b/src/repart/repart.c
@@ -2366,7 +2366,7 @@ static int config_parse_make_symlinks(
         int r;
 
         for (;;) {
-                _cleanup_free_ char *word = NULL, *path = NULL, *target = NULL, *d = NULL;
+                _cleanup_free_ char *word = NULL, *source = NULL, *target = NULL, *resolved_source = NULL, *resolved_target = NULL;
 
                 r = extract_first_word(&p, &word, NULL, EXTRACT_UNQUOTE);
                 if (r == -ENOMEM)
@@ -2379,7 +2379,7 @@ static int config_parse_make_symlinks(
                         return 0;
 
                 const char *q = word;
-                r = extract_many_words(&q, ":", EXTRACT_UNQUOTE|EXTRACT_DONT_COALESCE_SEPARATORS, &path, &target);
+                r = extract_many_words(&q, ":", EXTRACT_UNQUOTE|EXTRACT_DONT_COALESCE_SEPARATORS, &source, &target);
                 if (r < 0) {
                         log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid syntax, ignoring: %s", q);
                         continue;
@@ -2390,18 +2390,26 @@ static int config_parse_make_symlinks(
                         continue;
                 }
 
-                r = specifier_printf(path, PATH_MAX-1, system_and_tmp_specifier_table, arg_root, /* userdata= */ NULL, &d);
+                r = specifier_printf(source, PATH_MAX-1, system_and_tmp_specifier_table, arg_root, /* userdata= */ NULL, &resolved_source);
                 if (r < 0) {
                         log_syntax(unit, LOG_WARNING, filename, line, r,
-                                   "Failed to expand specifiers in Subvolumes= parameter, ignoring: %s", path);
+                                   "Failed to expand specifiers in MakeSymlinks= source, ignoring: %s", source);
                         continue;
                 }
 
-                r = path_simplify_and_warn(d, PATH_CHECK_ABSOLUTE, unit, filename, line, lvalue);
+                r = path_simplify_and_warn(resolved_source, PATH_CHECK_ABSOLUTE, unit, filename, line, lvalue);
                 if (r < 0)
                         continue;
 
-                r = strv_consume_pair(sv, TAKE_PTR(d), TAKE_PTR(target));
+                r = specifier_printf(target, PATH_MAX-1, system_and_tmp_specifier_table, arg_root, /* userdata= */ NULL, &resolved_target);
+                if (r < 0) {
+                        log_syntax(unit, LOG_WARNING, filename, line, r,
+                                   "Failed to expand specifiers in MakeSymlinks= target, ignoring: %s", target);
+                        continue;
+                }
+                /* Don't simplify the symlink target, preserve the exact argument including relative components */
+
+                r = strv_consume_pair(sv, TAKE_PTR(resolved_source), TAKE_PTR(resolved_target));
                 if (r < 0)
                         return log_error_errno(r, "Failed to add symlink to list: %m");
         }
diff --git a/test/units/TEST-58-REPART.sh b/test/units/TEST-58-REPART.sh
index bc0edbf206f..ddab61f1dc2 100755
--- a/test/units/TEST-58-REPART.sh
+++ b/test/units/TEST-58-REPART.sh
@@ -1618,6 +1618,8 @@ Type=root
 MakeDirectories=/dir
 MakeSymlinks=/foo:/bar
 MakeSymlinks=/dir/foo:/bar
+MakeSymlinks=/dir/foo-%a:/bar-%a
+MakeSymlinks=/dir/bar-%a:../bar-%a
 EOF
 
     systemd-repart --offline="$OFFLINE" \
@@ -1632,6 +1634,8 @@ EOF
     systemd-dissect "$imgs/zzz" -M "$imgs/mnt"
     assert_eq "$(readlink "$imgs/mnt/foo")" "/bar"
     assert_eq "$(readlink "$imgs/mnt/dir/foo")" "/bar"
+    assert_eq "$(readlink "$imgs/mnt/dir/foo-${architecture}")" "/bar-${architecture}"
+    assert_eq "$(readlink "$imgs/mnt/dir/bar-${architecture}")" "../bar-${architecture}"
     systemd-dissect -U "$imgs/mnt"
 }