annotate tests/test-eol-add.t @ 43658:0796e266d26b

dirs: resolve fuzzer OOM situation by disallowing deep directory hierarchies

It seems like 2048 directories ought to be enough for any reasonable
use of Mercurial?

A previous version of this patch scanned for slashes before any allocations
occurred. That approach is slower than this in the happy path, but much faster
than this in the case that too many slashes are encountered. We may want to
revisit it in the future using memchr() so it'll be well-optimized by the libc
we're using.

.. bc:

    Mercurial will now defend against OOMs by refusing to operate on
    paths with 2048 or more components. This means that _extremely_
    deep path hierarchies will be rejected, but we anticipate nobody
    is using hierarchies this deep.

Differential Revision: https://phab.mercurial-scm.org/D7411

Test adding .hgeol

  $ cat >> $HGRCPATH <<EOF
  > [diff]
  > git = 1
  > EOF
  $ seteol () {
  >     if [ $1 = "LF" ]; then
  >         EOL='\n'
  >     else
  >         EOL='\r\n'
  >     fi
  > }
  $ makerepo () {
  >     echo
  >     echo "# ==== setup repository ===="
  >     echo '% hg init'
  >     hg init repo
  >     cd repo
  >     printf "first\nsecond\nthird\n" > a.txt
  >     hg commit -d '100 0' --addremove -m 'LF commit'
  >     cd ..
  > }
  $ dotest () {
  >     seteol $1
  >     echo
  >     echo "% hg clone repo repo-$1"
  >     hg clone repo repo-$1
  >     cd repo-$1
  >     cat > .hg/hgrc <<EOF
  > [extensions]
  > eol =
  > [eol]
  > native = LF
  > EOF
  >     cat > .hgeol <<EOF
  > [patterns]
  > **.txt = native
  > [repository]
  > native = $1
  > EOF
  >     echo '% hg add .hgeol'
  >     hg add .hgeol
  >     echo '% hg status'
  >     hg status
  >     echo '% hg commit'
  >     hg commit -d '200 0' -m 'Added .hgeol file'
  >     echo '% hg status'
  >     hg status
  >     echo '% hg tip -p'
  >     hg tip -p
  >     cd ..
  >     rm -r repo-$1
  > }
  $ makerepo
  
  # ==== setup repository ====
  % hg init
  adding a.txt
  $ dotest LF
  
  % hg clone repo repo-LF
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  % hg add .hgeol
  % hg status
  A .hgeol
  % hg commit
  % hg status
  % hg tip -p
  changeset:   1:33503edb53b0
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:03:20 1970 +0000
  summary:     Added .hgeol file
  
  diff --git a/.hgeol b/.hgeol
  new file mode 100644
  --- /dev/null
  +++ b/.hgeol
  @@ -0,0 +1,4 @@
  +[patterns]
  +**.txt = native
  +[repository]
  +native = LF
  
  $ dotest CRLF
  
  % hg clone repo repo-CRLF
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  % hg add .hgeol
  % hg status
  M a.txt
  A .hgeol
  % hg commit
  % hg status
  % hg tip -p
  changeset:   1:6e64eaa9eb23
  tag:         tip
  user:        test
  date:        Thu Jan 01 00:03:20 1970 +0000
  summary:     Added .hgeol file
  
  diff --git a/.hgeol b/.hgeol
  new file mode 100644
  --- /dev/null
  +++ b/.hgeol
  @@ -0,0 +1,4 @@
  +[patterns]
  +**.txt = native
  +[repository]
  +native = CRLF
  diff --git a/a.txt b/a.txt
  --- a/a.txt
  +++ b/a.txt
  @@ -1,3 +1,3 @@
  -first
  -second
  -third
  +first\r (esc)
  +second\r (esc)
  +third\r (esc)
  
  $ rm -r repo