tdf#127069 sal: preserve gid of files in the unx osl_replaceFile()

The w32 implementation preserves all attributes of the destination
file, the unx one preserved none of them.

Bring the unx osl_replaceFile() closer to the w32 by preserving the gid
of the destination file as a start.

[ No testcase, we support building on systems where the user is part of
a single group only, and it's not possible to verify the effect of this
change in such environments. ]

Change-Id: I722d4802df34caf71a9dc0db1a3df8b76acb9de6
Reviewed-on: https://gerrit.libreoffice.org/78789
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

1 files changed, 32 insertions, 1 deletions

diff --git a/sal/osl/unx/file_misc.cxx b/sal/osl/unx/file_misc.cxx
index 8ecc59299265..1690ca884dda 100644
--- a/sal/osl/unx/file_misc.cxx
+++ b/sal/osl/unx/file_misc.cxx
@@ -617,7 +617,38 @@ oslFileError SAL_CALL osl_moveFile( rtl_uString* ustrFileURL, rtl_uString* ustrD
 
 oslFileError SAL_CALL osl_replaceFile(rtl_uString* ustrFileURL, rtl_uString* ustrDestURL)
 {
-    return osl_moveFile(ustrFileURL, ustrDestURL);
+    int nGid = -1;
+    char destPath[PATH_MAX];
+    oslFileError eRet = FileURLToPath(destPath, PATH_MAX, ustrDestURL);
+    if (eRet == osl_File_E_None)
+    {
+        struct stat aFileStat;
+        int nRet = stat(destPath, &aFileStat);
+        if (nRet == -1)
+        {
+            nRet = errno;
+            SAL_INFO("sal.file", "stat(" << destPath << "): " << UnixErrnoString(nRet));
+        }
+        else
+        {
+            nGid = aFileStat.st_gid;
+        }
+    }
+
+    eRet = osl_moveFile(ustrFileURL, ustrDestURL);
+
+    if (eRet == osl_File_E_None && nGid != -1)
+    {
+        int nRet = chown(destPath, -1, nGid);
+        if (nRet == -1)
+        {
+            nRet = errno;
+            SAL_INFO("sal.file",
+                     "chown(" << destPath << "-1, " << nGid << "): " << UnixErrnoString(nRet));
+        }
+    }
+
+    return eRet;
 }
 
 oslFileError SAL_CALL osl_copyFile( rtl_uString* ustrFileURL, rtl_uString* ustrDestURL )