Blob manifest;         /* Manifest in baseline form */
  Blob muuid;            /* Manifest uuid */
  Blob cksum1, cksum2;   /* Before and after commit checksums */
  Blob cksum1b;          /* Checksum recorded in the manifest */
  int szD;               /* Size of the delta manifest */
  int szB;               /* Size of the baseline manifest */
  int nConflict = 0;     /* Number of unresolved merge conflicts */
  int abortCommit = 0;   /* Abort the commit due to text format conversions */
  Blob ans;              /* Answer to continuation prompts */
  char cReply;           /* First character of ans */
  int bRecheck = 0;      /* Repeat fork and closed-branch checks*/

  memset(&sCiInfo, 0, sizeof(sCiInfo));
  url_proxy_options();
  /* --sha1sum is an undocumented alias for --hash for backwards compatiblity */
  useHash = find_option("hash",0,0)!=0 || find_option("sha1sum",0,0)!=0;
  noSign = find_option("nosign",0,0)!=0;
  forceDelta = find_option("delta",0,0)!=0;

        " WHERE is_selected(id)"
        "   AND (chnged OR deleted OR rid=0 OR pathname!=origname)")
  ){
    fossil_fatal("none of the selected files have changed; use "
                 "--allow-empty to override.");
  }

  /* This loop checks for potential forks and for check-ins against a
  ** closed branch.  The checks are repeated once after interactive
  ** check-in comment editing.
  */
  do{
    /*
    ** Do not allow a commit that will cause a fork unless the --allow-fork
    ** or --force flags is used, or unless this is a private check-in.
    ** The initial commit MUST have tags "trunk" and "sym-trunk".
    */
    if( sCiInfo.zBranch==0
     && allowFork==0
     && forceFlag==0
     && g.markPrivate==0
     && (vid==0 || !is_a_leaf(vid) || g.ckinLockFail)
    ){
      if( g.ckinLockFail ){
        fossil_fatal("Might fork due to a check-in race with user \"%s\"\n"
                     "Try \"update\" first, or --branch, or "
                     "use --override-lock",
                     g.ckinLockFail);
      }else{
        fossil_fatal("Would fork.  \"update\" first or use --branch or "
                     "--allow-fork.");
      }
    }
  
    /*
    ** Do not allow a commit against a closed leaf unless the commit
    ** ends up on a different branch.
    */
    if(
        /* parent check-in has the "closed" tag... */
        db_exists("SELECT 1 FROM tagxref"
                  " WHERE tagid=%d AND rid=%d AND tagtype>0",
                  TAG_CLOSED, vid)
        /* ... and the new check-in has no --branch option or the --branch
        ** option does not actually change the branch */
     && (sCiInfo.zBranch==0
         || db_exists("SELECT 1 FROM tagxref"
                      " WHERE tagid=%d AND rid=%d AND tagtype>0"
                      "   AND value=%Q", TAG_BRANCH, vid, sCiInfo.zBranch))
    ){
      fossil_fatal("cannot commit against a closed leaf");
    }

    /* Always exit the loop on the second pass */
    if( bRecheck ) break;
  
    /* Get the check-in comment.  This might involve prompting the
    ** user for the check-in comment, in which case we should resync
    ** to renew the check-in lock and repeat the checks for conflicts.
    */
    if( zComment ){
      blob_zero(&comment);
      blob_append(&comment, zComment, -1);
    }else if( zComFile ){
      blob_zero(&comment);
      blob_read_from_file(&comment, zComFile, ExtFILE);
      blob_to_utf8_no_bom(&comment, 1);
    }else if( dryRunFlag ){
      blob_zero(&comment);
    }else if( !noPrompt ){
      char *zInit = db_text(0,"SELECT value FROM vvar WHERE name='ci-comment'");
      prepare_commit_comment(&comment, zInit, &sCiInfo, vid);
      if( zInit && zInit[0] && fossil_strcmp(zInit, blob_str(&comment))==0 ){
        prompt_user("unchanged check-in comment.  continue (y/N)? ", &ans);
        cReply = blob_str(&ans)[0];
        blob_reset(&ans);
        if( cReply!='y' && cReply!='Y' ){
          fossil_exit(1);
        }
      }
      free(zInit);
      db_multi_exec("REPLACE INTO vvar VALUES('ci-comment',%B)", &comment);
      db_end_transaction(0);
      db_begin_transaction();
      if( !g.markPrivate && vid!=0 && !allowFork && !forceFlag ){
        /* Do another auto-pull, renewing the check-in lock.  Then set
        ** bRecheck so that we loop back above to verify that the check-in
        ** is still not against a closed branch and still won't fork. */
        int syncFlags = SYNC_PULL|SYNC_CKIN_LOCK;
        if( autosync_loop(syncFlags, db_get_int("autosync-tries", 1), 1) ){
          fossil_exit(1);
        }
        bRecheck = 1;
      }
    }
  }while( bRecheck );

  if( blob_size(&comment)==0 ){
    if( !dryRunFlag ){
      if( !noPrompt ){
        prompt_user("empty check-in comment.  continue (y/N)? ", &ans);
        cReply = blob_str(&ans)[0];
        blob_reset(&ans);
      }else{
        fossil_print("Abandoning commit due to empty check-in comment\n");
        cReply = 'N';
      }
      if( cReply!='y' && cReply!='Y' ){
        fossil_exit(1);
      }
    }




  }

  /*
  ** Step 1: Compute an aggregate MD5 checksum over the disk image
  ** of every file in vid.  The file names are part of the checksum.
  ** The resulting checksum is the same as is expected on the R-card
  ** of a manifest.

** of the other restrictions (2) through (4), it should be safe
** to leave "localauth" set to 0 in most installations, and 
** especially on cloned repositories on workstations. Leaving
** "localauth" at 0 makes the "fossil ui" command more convenient
** to use.
*/
/*
** SETTING: lock-timeout  width=25 default=60
** This is the number of seconds that a check-in lock will be held on
** the server before the lock expires.  The default is a 60-second delay.
** Set this value to zero to disable the check-in lock mechanism.
**
** This value should be set on the server to which users auto-sync
** their work.  This setting has no affect on client repositories.  The
** check-in lock mechanism is only effective if all users are auto-syncing
** to the same server.
**
** Check-in locks are an advisory mechanism designed to help prevent
** accidental forks due to a check-in race in installations where many
** user are  committing to the same branch and auto-sync is enabled.
** As forks are harmless, there is no danger in disabling this mechanism.
** However, keeping check-in locks turned on can help prevent unnecessary
** confusion.
*/
/*
** SETTING: main-branch      width=40 default=trunk
** The value is the primary branch for the project.
*/

      */
      if( blob_eq(&xfer.aToken[1], "ci-lock")
       && xfer.nToken==4
       && blob_is_hname(&xfer.aToken[2])
      ){
        Stmt q;
        sqlite3_int64 iNow = time(0);
        sqlite3_int64 maxAge = db_get_int("lock-timeout",60);
        int seenFault = 0;
        db_prepare(&q,
          "SELECT json_extract(value,'$.login'),"
          "       mtime,"
          "       json_extract(value,'$.clientid'),"
          "       (SELECT rid FROM blob WHERE uuid=substr(name,9)),"
          "       name"