A script that implements uppercasing all letters in a file.

  $ UPPERCASEPY="$TESTTMP/uppercase.py"

  $ cat > $UPPERCASEPY <<EOF

  > import sys

  > from mercurial.utils.procutil import setbinary

  > setbinary(sys.stdin)

  > setbinary(sys.stdout)

  > sys.stdout.write(sys.stdin.read().upper())

  > EOF

  $ TESTLINES="foo\nbar\nbaz\n"

  $ printf $TESTLINES | "$PYTHON" $UPPERCASEPY

  FOO

  BAR

  BAZ

This file attempts to test our workarounds for pickle's lack of

support for short reads.

  $ cat >> $HGRCPATH <<EOF

  > [extensions]

  > fix =

  > [fix]

  > uppercase-whole-file:command="$PYTHON" $UPPERCASEPY

  > uppercase-whole-file:pattern=set:**

  > EOF

  $ hg init repo

  $ cd repo

# Create a file that's large enough that it seems to not fit in

# pickle's buffer, making it use the code path that expects our

# _blockingreader's read() method to return bytes.

  $ echo "some stuff" > file

  $ for i in $($TESTDIR/seq.py 13); do

  >   cat file file > tmp

  >   mv -f tmp file

  > done

  $ hg commit -Am "add large file"

  adding file

Check that we don't get a crash

  $ hg fix -r .

  saved backup bundle to $TESTTMP/repo/.hg/strip-backup/*-fix.hg (glob)