util: add fs helpers to convert perms to str and octal

Github-Pull: bitcoin#28167 Rebased-From: 36816dc
bitcoinknots · May 28, 2024 · a1b1d33 · a1b1d33
1 parent ba25bec
commit a1b1d33
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diff --git a/src/util/fs_helpers.cpp b/src/util/fs_helpers.cpp
@@ -307,6 +307,29 @@ std::string PermsToString(fs::perms p)
     return perm_str;
 }
 
+unsigned int PermsToOctal(fs::perms p)
+{
+    unsigned int octalPerms = 0;
+
+    octalPerms |= (p & fs::perms::owner_read)   != fs::perms::none ? 0400 : 0;
+    octalPerms |= (p & fs::perms::owner_write)  != fs::perms::none ? 0200 : 0;
+    octalPerms |= (p & fs::perms::owner_exec)   != fs::perms::none ? 0100 : 0;
+    octalPerms |= (p & fs::perms::group_read)   != fs::perms::none ? 0040 : 0;
+    octalPerms |= (p & fs::perms::group_write)  != fs::perms::none ? 0020 : 0;
+    octalPerms |= (p & fs::perms::group_exec)   != fs::perms::none ? 0010 : 0;
+    octalPerms |= (p & fs::perms::others_read)  != fs::perms::none ? 0004 : 0;
+    octalPerms |= (p & fs::perms::others_write) != fs::perms::none ? 0002 : 0;
+    octalPerms |= (p & fs::perms::others_exec)  != fs::perms::none ? 0001 : 0;
+
+    return octalPerms;
+}
+
+std::string PermsToOctalString(fs::perms p) {
+    std::ostringstream oss;
+    oss << std::oct << std::setfill('0') << std::setw(3) << PermsToOctal(p);
+    return oss.str();
+}
+
 std::optional<fs::perms> StringToPerms(const std::string& s)
 {
     if (s == "owner") {

diff --git a/src/util/fs_helpers.h b/src/util/fs_helpers.h
@@ -64,6 +64,8 @@ bool TryCreateDirectories(const fs::path& p);
 fs::path GetDefaultDataDir();
 
 std::string PermsToString(fs::perms p);
+unsigned int PermsToOctal(fs::perms p);
+std::string PermsToOctalString(fs::perms p);
 std::optional<fs::perms> StringToPerms(const std::string& s);
 
 #ifdef WIN32