hgeditor

rust: translated random test of missingancestors

This is a Rust implementation of the random
DAG generator and related incrementalmissingancestors
tests against a naive brute force implementation.

It is provided as an integration test, so that it
won't run by default if any unit test fails.

In case of a failed example, all needed information
for reproduction is included in the panic message,
(this is how
`test_remove_ancestors_from_case1()` has been generated),
as well as the random seed.

The whole test is rerunnable by passing the random seed
in the TEST_RANDOM_SEED environment variable.
The other parameters (numbers of iterations) can be passed
in the TEST_MISSING_ANCESTORS environment variable.

An alternative would have been to expose to Python
MissingAncestors<VecGraphs> but that would have meant
pollution of the release build used from Python,
whereas we do it in this changeset within the tests submodule

Differential Revision: https://phab.mercurial-scm.org/D5417

#!/bin/sh
#
# This is an example of using HGEDITOR to create of diff to review the
# changes while committing.

# If you want to pass your favourite editor some other parameters
# only for Mercurial, modify this:
case "${EDITOR}" in
    "")
        EDITOR="vi"
        ;;
    emacs)
        EDITOR="$EDITOR -nw"
        ;;
    gvim|vim)
        EDITOR="$EDITOR -f -o"
        ;;
esac


HGTMP=""
cleanup_exit() {
    rm -rf "$HGTMP"
}

# Remove temporary files even if we get interrupted
trap "cleanup_exit" 0 # normal exit
trap "exit 255" HUP INT QUIT ABRT TERM

HGTMP=$(mktemp -d ${TMPDIR-/tmp}/hgeditor.XXXXXX)
[ x$HGTMP != x -a -d $HGTMP ] || {
  echo "Could not create temporary directory! Exiting." 1>&2
  exit 1
}

(
    grep '^HG: changed' "$1" | cut -b 13- | while read changed; do
        "$HG" diff "$changed" >> "$HGTMP/diff"
    done
)

cat "$1" > "$HGTMP/msg"

MD5=$(which md5sum 2>/dev/null) || \
    MD5=$(which md5 2>/dev/null)
[ -x "${MD5}" ] && CHECKSUM=`${MD5} "$HGTMP/msg"`
if [ -s "$HGTMP/diff" ]; then
    $EDITOR "$HGTMP/msg" "$HGTMP/diff" || exit $?
else
    $EDITOR "$HGTMP/msg" || exit $?
fi
[ -x "${MD5}" ] && (echo "$CHECKSUM" | ${MD5} -c >/dev/null 2>&1 && exit 13)

mv "$HGTMP/msg" "$1"

exit $?