Revision d699676dda5fdf0996601006c3bac2a9c077a862 authored by Linus Torvalds on 10 August 2007, 19:31:20 UTC, committed by Junio C Hamano on 10 August 2007, 21:00:25 UTC
This trivially optimizes the two-way merge case of git-read-tree too, which affects switching branches. When you have tons and tons of files in your repository, but there are only small differences in the branches (maybe just a couple of files changed), the biggest cost of the branch switching was actually just the index calculations. This fixes it (timings for switching between the "testing" and "master" branches in the 100,000 file testing-repo-from-hell, where the branches only differ in one small file). Before: [torvalds@woody bummer]$ time git checkout master real 0m9.919s user 0m8.461s sys 0m0.264s After: [torvalds@woody bummer]$ time git checkout testing real 0m0.576s user 0m0.348s sys 0m0.228s so it's easily an order of magnitude different. This concludes the series. I think we could/should do the three-way merge too (to speed up merges), but I'm lazy. Somebody else can do it. The rule is very simple: you need to remove the old entry if: - you want to remove the file entirely - you replace it with a "merge conflict" entry (ie a non-stage-0 entry) and you can avoid removing it if you either - keep the old one - or resolve it to a new one. and these rules should all be valid for the three-way case too. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 288f072
git-bisect.sh
#!/bin/sh
USAGE='[start|bad|good|next|reset|visualize|replay|log|run]'
LONG_USAGE='git bisect start [<bad> [<good>...]] [--] [<pathspec>...]
reset bisect state and start bisection.
git bisect bad [<rev>]
mark <rev> a known-bad revision.
git bisect good [<rev>...]
mark <rev>... known-good revisions.
git bisect next
find next bisection to test and check it out.
git bisect reset [<branch>]
finish bisection search and go back to branch.
git bisect visualize
show bisect status in gitk.
git bisect replay <logfile>
replay bisection log.
git bisect log
show bisect log.
git bisect run <cmd>...
use <cmd>... to automatically bisect.'
. git-sh-setup
require_work_tree
sq() {
@@PERL@@ -e '
for (@ARGV) {
s/'\''/'\'\\\\\'\''/g;
print " '\''$_'\''";
}
print "\n";
' "$@"
}
bisect_autostart() {
test -d "$GIT_DIR/refs/bisect" || {
echo >&2 'You need to start by "git bisect start"'
if test -t 0
then
echo >&2 -n 'Do you want me to do it for you [Y/n]? '
read yesno
case "$yesno" in
[Nn]*)
exit ;;
esac
bisect_start
else
exit 1
fi
}
}
bisect_start() {
#
# Verify HEAD. If we were bisecting before this, reset to the
# top-of-line master first!
#
head=$(GIT_DIR="$GIT_DIR" git symbolic-ref HEAD) ||
die "Bad HEAD - I need a symbolic ref"
case "$head" in
refs/heads/bisect)
if [ -s "$GIT_DIR/head-name" ]; then
branch=`cat "$GIT_DIR/head-name"`
else
branch=master
fi
git checkout $branch || exit
;;
refs/heads/*)
[ -s "$GIT_DIR/head-name" ] && die "won't bisect on seeked tree"
echo "$head" | sed 's#^refs/heads/##' >"$GIT_DIR/head-name"
;;
*)
die "Bad HEAD - strange symbolic ref"
;;
esac
#
# Get rid of any old bisect state
#
bisect_clean_state
mkdir "$GIT_DIR/refs/bisect"
#
# Check for one bad and then some good revisions.
#
has_double_dash=0
for arg; do
case "$arg" in --) has_double_dash=1; break ;; esac
done
orig_args=$(sq "$@")
bad_seen=0
while [ $# -gt 0 ]; do
arg="$1"
case "$arg" in
--)
shift
break
;;
*)
rev=$(git rev-parse --verify "$arg^{commit}" 2>/dev/null) || {
test $has_double_dash -eq 1 &&
die "'$arg' does not appear to be a valid revision"
break
}
if [ $bad_seen -eq 0 ]; then
bad_seen=1
bisect_write_bad "$rev"
else
bisect_write_good "$rev"
fi
shift
;;
esac
done
sq "$@" >"$GIT_DIR/BISECT_NAMES"
echo "git-bisect start$orig_args" >>"$GIT_DIR/BISECT_LOG"
bisect_auto_next
}
bisect_bad() {
bisect_autostart
case "$#" in
0)
rev=$(git rev-parse --verify HEAD) ;;
1)
rev=$(git rev-parse --verify "$1^{commit}") ;;
*)
usage ;;
esac || exit
bisect_write_bad "$rev"
echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
bisect_auto_next
}
bisect_write_bad() {
rev="$1"
echo "$rev" >"$GIT_DIR/refs/bisect/bad"
echo "# bad: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
}
bisect_good() {
bisect_autostart
case "$#" in
0) revs=$(git rev-parse --verify HEAD) || exit ;;
*) revs=$(git rev-parse --revs-only --no-flags "$@") &&
test '' != "$revs" || die "Bad rev input: $@" ;;
esac
for rev in $revs
do
rev=$(git rev-parse --verify "$rev^{commit}") || exit
bisect_write_good "$rev"
echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
done
bisect_auto_next
}
bisect_write_good() {
rev="$1"
echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
echo "# good: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
}
bisect_next_check() {
missing_good= missing_bad=
git show-ref -q --verify refs/bisect/bad || missing_bad=t
test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
case "$missing_good,$missing_bad,$1" in
,,*)
: have both good and bad - ok
;;
*,)
# do not have both but not asked to fail - just report.
false
;;
t,,good)
# have bad but not good. we could bisect although
# this is less optimum.
echo >&2 'Warning: bisecting only with a bad commit.'
if test -t 0
then
printf >&2 'Are you sure [Y/n]? '
case "$(read yesno)" in [Nn]*) exit 1 ;; esac
fi
: bisect without good...
;;
*)
THEN=''
test -d "$GIT_DIR/refs/bisect" || {
echo >&2 'You need to start by "git bisect start".'
THEN='then '
}
echo >&2 'You '$THEN'need to give me at least one good' \
'and one bad revisions.'
echo >&2 '(You can use "git bisect bad" and' \
'"git bisect good" for that.)'
exit 1 ;;
esac
}
bisect_auto_next() {
bisect_next_check && bisect_next || :
}
bisect_next() {
case "$#" in 0) ;; *) usage ;; esac
bisect_autostart
bisect_next_check good
bad=$(git rev-parse --verify refs/bisect/bad) &&
good=$(git for-each-ref --format='^%(objectname)' \
"refs/bisect/good-*" | tr '[\012]' ' ') &&
eval="git rev-list --bisect-vars $good $bad --" &&
eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
eval=$(eval "$eval") &&
eval "$eval" || exit
if [ -z "$bisect_rev" ]; then
echo "$bad was both good and bad"
exit 1
fi
if [ "$bisect_rev" = "$bad" ]; then
echo "$bisect_rev is first bad commit"
git diff-tree --pretty $bisect_rev
exit 0
fi
echo "Bisecting: $bisect_nr revisions left to test after this"
echo "$bisect_rev" >"$GIT_DIR/refs/heads/new-bisect"
git checkout -q new-bisect || exit
mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
GIT_DIR="$GIT_DIR" git symbolic-ref HEAD refs/heads/bisect
git show-branch "$bisect_rev"
}
bisect_visualize() {
bisect_next_check fail
not=`cd "$GIT_DIR/refs" && echo bisect/good-*`
eval gitk bisect/bad --not $not -- $(cat "$GIT_DIR/BISECT_NAMES")
}
bisect_reset() {
case "$#" in
0) if [ -s "$GIT_DIR/head-name" ]; then
branch=`cat "$GIT_DIR/head-name"`
else
branch=master
fi ;;
1) git show-ref --verify --quiet -- "refs/heads/$1" || {
echo >&2 "$1 does not seem to be a valid branch"
exit 1
}
branch="$1" ;;
*)
usage ;;
esac
if git checkout "$branch"; then
rm -f "$GIT_DIR/head-name"
bisect_clean_state
fi
}
bisect_clean_state() {
rm -fr "$GIT_DIR/refs/bisect"
rm -f "$GIT_DIR/refs/heads/bisect"
rm -f "$GIT_DIR/BISECT_LOG"
rm -f "$GIT_DIR/BISECT_NAMES"
rm -f "$GIT_DIR/BISECT_RUN"
}
bisect_replay () {
test -r "$1" || {
echo >&2 "cannot read $1 for replaying"
exit 1
}
bisect_reset
while read bisect command rev
do
test "$bisect" = "git-bisect" || continue
case "$command" in
start)
cmd="bisect_start $rev"
eval "$cmd"
;;
good)
echo "$rev" >"$GIT_DIR/refs/bisect/good-$rev"
echo "# good: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
echo "git-bisect good $rev" >>"$GIT_DIR/BISECT_LOG"
;;
bad)
echo "$rev" >"$GIT_DIR/refs/bisect/bad"
echo "# bad: "$(git show-branch $rev) >>"$GIT_DIR/BISECT_LOG"
echo "git-bisect bad $rev" >>"$GIT_DIR/BISECT_LOG"
;;
*)
echo >&2 "?? what are you talking about?"
exit 1 ;;
esac
done <"$1"
bisect_auto_next
}
bisect_run () {
bisect_next_check fail
while true
do
echo "running $@"
"$@"
res=$?
# Check for really bad run error.
if [ $res -lt 0 -o $res -ge 128 ]; then
echo >&2 "bisect run failed:"
echo >&2 "exit code $res from '$@' is < 0 or >= 128"
exit $res
fi
# Use "bisect_good" or "bisect_bad"
# depending on run success or failure.
if [ $res -gt 0 ]; then
next_bisect='bisect_bad'
else
next_bisect='bisect_good'
fi
# We have to use a subshell because bisect_good or
# bisect_bad functions can exit.
( $next_bisect > "$GIT_DIR/BISECT_RUN" )
res=$?
cat "$GIT_DIR/BISECT_RUN"
if [ $res -ne 0 ]; then
echo >&2 "bisect run failed:"
echo >&2 "$next_bisect exited with error code $res"
exit $res
fi
if grep "is first bad commit" "$GIT_DIR/BISECT_RUN" > /dev/null; then
echo "bisect run success"
exit 0;
fi
done
}
case "$#" in
0)
usage ;;
*)
cmd="$1"
shift
case "$cmd" in
start)
bisect_start "$@" ;;
bad)
bisect_bad "$@" ;;
good)
bisect_good "$@" ;;
next)
# Not sure we want "next" at the UI level anymore.
bisect_next "$@" ;;
visualize)
bisect_visualize "$@" ;;
reset)
bisect_reset "$@" ;;
replay)
bisect_replay "$@" ;;
log)
cat "$GIT_DIR/BISECT_LOG" ;;
run)
bisect_run "$@" ;;
*)
usage ;;
esac
esac
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