Merge bitcoin/bitcoin#28784: rpc: keep `.cookie` file if it was not generated

7cb9367157eb42ee06bc6fa024522cc14a80138d rpc: keep .cookie if it was not generated (Roman Zeyde)

Pull request description:

  Otherwise, starting bitcoind twice may cause the `.cookie` file generated by the first instance to be deleted by the second instance shutdown (after failing to obtain a lock).

ACKs for top commit:
  willcl-ark:
    re-ACK 7cb9367157eb42ee06bc6fa024522cc14a80138d
  achow101:
    ACK 7cb9367157eb42ee06bc6fa024522cc14a80138d
  kristapsk:
    re-ACK 7cb9367157eb42ee06bc6fa024522cc14a80138d
  stickies-v:
    ACK 7cb9367157eb42ee06bc6fa024522cc14a80138d

Tree-SHA512: 0960dbc457975b0e0535f3d814824a879d7f85c9f1191537415b3fc253429a316a8e4badde56c8bc139778f132392983cec5fbe03891fb15ff61d3bc3f6e681b

1 files changed, 7 insertions, 1 deletions

diff --git a/src/rpc/request.cpp b/src/rpc/request.cpp
index 4c67da8b70..b7acd62ee3 100644
--- a/src/rpc/request.cpp
+++ b/src/rpc/request.cpp
@@ -80,6 +80,8 @@ static fs::path GetAuthCookieFile(bool temp=false)
     return AbsPathForConfigVal(gArgs, arg);
 }
 
+static bool g_generated_cookie = false;
+
 bool GenerateAuthCookie(std::string *cookie_out)
 {
     const size_t COOKIE_SIZE = 32;
@@ -105,6 +107,7 @@ bool GenerateAuthCookie(std::string *cookie_out)
         LogPrintf("Unable to rename cookie authentication file %s to %s\n", fs::PathToString(filepath_tmp), fs::PathToString(filepath));
         return false;
     }
+    g_generated_cookie = true;
     LogPrintf("Generated RPC authentication cookie %s\n", fs::PathToString(filepath));
 
     if (cookie_out)
@@ -131,7 +134,10 @@ bool GetAuthCookie(std::string *cookie_out)
 void DeleteAuthCookie()
 {
     try {
-        fs::remove(GetAuthCookieFile());
+        if (g_generated_cookie) {
+            // Delete the cookie file if it was generated by this process
+            fs::remove(GetAuthCookieFile());
+        }
     } catch (const fs::filesystem_error& e) {
         LogPrintf("%s: Unable to remove random auth cookie file: %s\n", __func__, fsbridge::get_filesystem_error_message(e));
     }