goto end_accept_unversioned_file;
    }
  }else{
    nullContent = 1;
  }

  /* The isWriter flag must be true in order to land the new file */
  if( !isWriter ){
    blob_appendf(&pXfer->err, "Write permissions for unversioned files missing");
    goto end_accept_unversioned_file;
  }

  /* Make sure we have a valid g.rcvid marker */
  content_rcvid_init(0);

  /* Check to see if current content really should be overwritten.  Ideally,
  ** a uvfile card should never have been sent unless the overwrite should
  ** occur.  But do not trust the sender.  Double-check.

    ** Server accepts an unversioned file from the client.
    */
    if( blob_eq(&xfer.aToken[0], "uvfile") ){
      xfer_accept_unversioned_file(&xfer, g.perm.WrUnver);
      if( blob_size(&xfer.err) ){
        cgi_reset_content();
        @ error %T(blob_str(&xfer.err))
        fossil_print("%%%%%%%% xfer.err: '%s'\n", blob_str(&xfer.err));
        nErr++;
        break;
      }
    }else

    /*   gimme HASH
    **

embedded into Fossil itself. Fossil's build system and test suite are
largely based on Tcl.⁵ All of this is quite portable.

About half of Git's code is POSIX C, and about a third is POSIX shell
code. This is largely why the so-called "Git for Windows" distributions
(both [https://git-scm.com/download/win|first-party] and
[https://gitforwindows.org/|third-party]) are actually an
[https://osdn.net/projects/mingw/|MSYS POSIX portability environment] bundled
with all of the Git stuff, because it would be too painful to port Git
natively to Windows. Git is a foreign citizen on Windows, speaking to it
only through a translator.⁶

While Fossil does lean toward POSIX norms when given a choice — LF-only
line endings are treated as first-class citizens over CR+LF, for example
— the Windows build of Fossil is truly native.

The third-party extensions to Git tend to follow this same pattern.
[https://docs.gitlab.com/ee/install/install_methods.html#microsoft-windows | 
GitLab isn't portable to Windows at all],
for example. For that matter, GitLab isn't even officially supported on
macOS, the BSDs, or uncommon Linuxes! We have many users who regularly
build and run Fossil on all of these systems.


<h3 id="vs-linux">2.5 Linux vs. SQLite</h3>