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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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Overview
Comment:An improved way of generating the SQLITE_READONLY_DIRECTORY error. The error message submitted to sqlite3_log() is still correct this way.
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SHA3-256: 1c0aa919ee429cd194820ec9c54084563f39e63fd399b23f859fc6703b429b15
User & Date: drh 2017-12-13 20:35:34
Context
2017-12-13
22:42
Add support for the 'lsm1.c' target in the MSVC makefile. check-in: 6de21dea user: mistachkin tags: trunk
20:35
An improved way of generating the SQLITE_READONLY_DIRECTORY error. The error message submitted to sqlite3_log() is still correct this way. check-in: 1c0aa919 user: drh tags: trunk
20:02
New result code SQLITE_READONLY_DIRECTORY is returned when an attempt is made to write on a database file that is in a read-only directory and hence the journal file could not be created. This situation formerly returned SQLITE_CANTOPEN, which less helpful. check-in: 3ec73c38 user: drh tags: trunk
Changes
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Changes to src/os_unix.c.

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      assert( !p->pPreallocatedUnused );
      assert( eType==SQLITE_OPEN_WAL || eType==SQLITE_OPEN_MAIN_JOURNAL );
      return rc;
    }
    fd = robust_open(zName, openFlags, openMode);
    OSTRACE(("OPENX   %-3d %s 0%o\n", fd, zName, openFlags));
    assert( !isExclusive || (openFlags & O_CREAT)!=0 );
    if( fd<0 && isNewJrnl && osAccess(zName, F_OK) ){
      /* Trying to create a journal file where we don't have write 
      ** permission on the directory */
      rc = unixLogError(SQLITE_READONLY_DIRECTORY, "open", zName);
      goto open_finished;
    }
    if( fd<0 && errno!=EISDIR && isReadWrite ){
      /* Failed to open the file for read/write access. Try read-only. */
      flags &= ~(SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE);
      openFlags &= ~(O_RDWR|O_CREAT);
      flags |= SQLITE_OPEN_READONLY;
      openFlags |= O_RDONLY;
      isReadonly = 1;
      fd = robust_open(zName, openFlags, openMode);
    }
    if( fd<0 ){
      rc = unixLogError(SQLITE_CANTOPEN_BKPT, "open", zName);



      goto open_finished;
    }

    /* If this process is running as root and if creating a new rollback
    ** journal or WAL file, set the ownership of the journal or WAL to be
    ** the same as the original database.
    */







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      assert( !p->pPreallocatedUnused );
      assert( eType==SQLITE_OPEN_WAL || eType==SQLITE_OPEN_MAIN_JOURNAL );
      return rc;
    }
    fd = robust_open(zName, openFlags, openMode);
    OSTRACE(("OPENX   %-3d %s 0%o\n", fd, zName, openFlags));
    assert( !isExclusive || (openFlags & O_CREAT)!=0 );






    if( fd<0 && errno!=EISDIR && isReadWrite ){
      /* Failed to open the file for read/write access. Try read-only. */
      flags &= ~(SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE);
      openFlags &= ~(O_RDWR|O_CREAT);
      flags |= SQLITE_OPEN_READONLY;
      openFlags |= O_RDONLY;
      isReadonly = 1;
      fd = robust_open(zName, openFlags, openMode);
    }
    if( fd<0 ){
      rc = unixLogError(SQLITE_CANTOPEN_BKPT, "open", zName);
      /* If unable to create a journal, change the error code to
      ** indicate that the directory permissions are wrong. */
      if( isNewJrnl && osAccess(zName, F_OK) ) rc = SQLITE_READONLY_DIRECTORY;
      goto open_finished;
    }

    /* If this process is running as root and if creating a new rollback
    ** journal or WAL file, set the ownership of the journal or WAL to be
    ** the same as the original database.
    */