contrib/vim/hg-menu.vim

largefiles: don't verify largefile hashes on servers when processing statlfile

When changesets referencing largefiles are pushed then the corresponding
largefiles will be pushed too - unless the target already has them. The client
will use statlfile to make sure it only sends largefiles that the target
doesn't have. The server would however on every statlfile check that the
content of the largefile had the expected hash. What should be cheap thus
became an expensive operation that trashed the disk and the cache.

Largefile hashes are already checked by putlfile before being stored on the
server. A server should thus be able to keep its largefile store free of
errors - even more than it can keep revlogs free of errors. Verification should
happen when running 'hg verify' locally on the server. Rehashing every
largefile on every remote stat is too expensive.

Clients will also stat lfiles before downloading them. When the server verified
the hash in stat it meant that it had to read the file twice to serve it.

With this change the server will assume its own hashes are ok without checking
them on every statlfile.

Some consequences of this change:
- in case of server side corruption the problem will be detected by the
  existing check on the client side - not on server side
- clients that could upload an uncorrupted largefile when pushing will no
  longer magically heal the server (and break hardlinks) - a client will now
  only upload its uncorrupted files after the corrupted file has been removed
  on the server side
- client side verify will no longer report corruption in files it doesn't have

(Issue3123 discussed related problems - and how they have been fixed.)

" vim600: set foldmethod=marker:
" =============================================================================
"  Name Of File: hg-menu.vim
"   Description: Interface to Mercurial Version Control.
"        Author: Steve Borho (modified Jeff Lanzarotta's RCS script)
"          Date: Wednesday, October 5, 2005
"       Version: 0.1.0
"     Copyright: None.
"         Usage: These command and gui menu displays useful hg functions
" Configuration: Your hg executable must be in your path.
" =============================================================================

" Section: Init {{{1
if exists("loaded_hg_menu")
  finish
endif
let loaded_hg_menu = 1

" Section: Menu Options {{{1
if has("gui")
"  amenu H&G.Commit\ File<Tab>,ci :!hg commit %<CR>:e!<CR>
"  amenu H&G.Commit\ All<Tab>,call :!hg commit<CR>:e!<CR>
"  amenu H&G.-SEP1-        <nul>
  amenu H&G.Add<Tab>\\add :!hg add %<CR><CR>
  amenu H&G.Forget\ Add<Tab>\\fgt :!hg forget %<CR><CR>
  amenu H&G.Show\ Differences<Tab>\\diff :call ShowResults("FileDiff", "hg\ diff")<CR><CR>
  amenu H&G.Revert\ to\ Last\ Version<Tab>\\revert :!hg revert %<CR>:e!<CR>
  amenu H&G.Show\ History<Tab>\\log :call ShowResults("FileLog", "hg\ log")<CR><CR>
  amenu H&G.Annotate<Tab>\\an :call ShowResults("annotate", "hg\ annotate")<CR><CR>
  amenu H&G.-SEP1-        <nul>
  amenu H&G.Repo\ Status<Tab>\\stat :call ShowResults("RepoStatus", "hg\ status")<CR><CR>
  amenu H&G.Pull<Tab>\\pull :!hg pull<CR>:e!<CR>
  amenu H&G.Update<Tab>\\upd :!hg update<CR>:e!<CR>
endif

" Section: Mappings {{{1
if(v:version >= 600)
  " The default Leader is \ 'backslash'
  map <Leader>add       :!hg add %<CR><CR>
  map <Leader>fgt       :!hg forget %<CR><CR>
  map <Leader>diff      :call ShowResults("FileDiff", "hg\ diff")<CR><CR>
  map <Leader>revert    :!hg revert %<CR>:e!<CR>
  map <Leader>log       :call ShowResults("FileLog", "hg\ log")<CR><CR>
  map <Leader>an        :call ShowResults("annotate", "hg\ annotate")<CR><CR>
  map <Leader>stat      :call ShowResults("RepoStatus", "hg\ status")<CR><CR>
  map <Leader>upd       :!hg update<CR>:e!<CR>
  map <Leader>pull      :!hg pull<CR>:e!<CR>
else
  " pre 6.0, the default Leader was a comma
  map ,add          :!hg add %<CR><CR>
  map ,fgt          :!hg forget %<CR><CR>
  map ,diff         :call ShowResults("FileDiff", "hg\ diff")<CR><CR>
  map ,revert       :!hg revert<CR>:e!<CR>
  map ,log          :call ShowResults("FileLog", "hg\ log")<CR><CR>
  map ,an           :call ShowResults("annotate", "hg\ annotate")<CR><CR>
  map ,stat         :call ShowResults("RepoStatus", "hg\ status")<CR><CR>
  map ,upd          :!hg update<CR>:e!<CR>
  map ,pull         :!hg pull<CR>:e!<CR>
endif

" Section: Functions {{{1
" Show the log results of the current file with a revision control system.
function! ShowResults(bufferName, cmdName)
  " Modify the shortmess option:
  " A  don't give the "ATTENTION" message when an existing swap file is
  "    found.
  set shortmess+=A

  " Get the name of the current buffer.
  let currentBuffer = bufname("%")

  " If a buffer with the name rlog exists, delete it.
  if bufexists(a:bufferName)
    execute 'bd! ' a:bufferName
  endif

  " Create a new buffer.
  execute 'new ' a:bufferName

  " Execute the command.
  execute 'r!' a:cmdName ' ' currentBuffer

  " Make is so that the file can't be edited.
  setlocal nomodified
  setlocal nomodifiable
  setlocal readonly

  " Go to the beginning of the buffer.
  execute "normal 1G"

  " Restore the shortmess option.
  set shortmess-=A
endfunction