tests/test-mq-merge

findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.

We speed up 'findrenames' for the usecase when a user specifies they
want a similarity of 100% by matching files by their exact SHA1 hash
value. This reduces the number of comparisons required to find exact
matches from O(n^2) to O(n).

While it would be nice if we could just use mercurial's pre-calculated
SHA1 hash for existing files, this hash includes the file's ancestor
information making it unsuitable for our purposes. Instead, we calculate
the hash of old content from scratch.

The following benchmarks were taken on the current head of crew:

addremove 100% similarity:
  rm -rf *; hg up -C; mv tests tests.new
  hg --time addremove -s100 --dry-run

  before:  real 176.350 secs (user 128.890+0.000 sys 47.430+0.000)
  after:   real   2.130 secs (user   1.890+0.000 sys  0.240+0.000)

addremove 75% similarity:
  rm -rf *; hg up -C; mv tests tests.new; \
      for i in tests.new/*; do echo x >> $i; done
  hg --time addremove -s75  --dry-run

  before: real 264.560 secs (user 215.130+0.000 sys 49.410+0.000)
  after:  real 218.710 secs (user 172.790+0.000 sys 45.870+0.000)

#!/bin/sh

# Test issue 529 - mq aborts when merging patch deleting files

checkundo()
{
    if [ -f .hg/store/undo ]; then
	echo ".hg/store/undo still exists after $1"
    fi
}

echo "[extensions]" >> $HGRCPATH
echo "mq =" >> $HGRCPATH
echo "[mq]" >> $HGRCPATH
echo "git = keep" >> $HGRCPATH

# Commit two dummy files in "init" changeset
hg init t
cd t
echo a > a
echo b > b
hg ci -Am init
hg tag -l init

# Create a patch removing a
hg qnew rm_a
hg rm a
hg qrefresh -m "rm a"

# Save the patch queue so we can merge it later
hg qsave -c -e 2>&1 | grep -v ^copy
checkundo qsave

# Update b and commit in an "update" changeset
hg up -C init
echo b >> b
hg st
hg ci -m update

# Here, qpush used to abort with :
# The system cannot find the file specified => a
hg manifest
hg qpush -a -m 2>&1 | grep -v ^merging
checkundo 'qpush -m'
hg manifest

# ensure status is correct after merge
hg qpop -a
cd ..

# Classic MQ merge sequence *with an explicit named queue*
echo
echo % init t2
hg init t2
cd t2
echo '[diff]' > .hg/hgrc
echo 'nodates = 1' >> .hg/hgrc
echo a > a
hg ci -Am init
echo b > a
hg ci -m changea
hg up -C 0
hg cp a aa
echo c >> a
hg qnew --git -f -e patcha
echo d >> a
hg qnew -d '0 0' -f -e patcha2
echo % create the reference queue
hg qsave -c -e -n refqueue 2> /dev/null
hg up -C 1
echo % merge
HGMERGE=internal:other hg qpush -a -m -n refqueue 2>&1 | \
    sed 's/merging with queue at.*refqueue/merging with queue at refqueue/'
echo % check patcha is still a git patch
cat .hg/patches/patcha
echo % check patcha2 is still a regular patch
grep git .hg/patches/patcha2 && echo 'git patch found!'
cd ..