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git/git-rebase.sh
Tor Arne Vestbø a9c3821ca2 git-rebase: Add --stat and --no-stat for producing diffstat on rebase
The behavior of --verbose is unchanged, but uses a different state
variable internally, so that the meaning of verbose output may be
expanded without affecting the diffstat. This is also reflected in
the documentation.

The configuration option rebase.stat works the same was as merg.stat,
but the default is currently false.

Signed-off-by: Tor Arne Vestbø <torarnv@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-03-02 23:22:32 -08:00

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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano.
#
USAGE='[--interactive | -i] [-v] [--onto <newbase>] [<upstream>|--root] [<branch>]'
LONG_USAGE='git-rebase replaces <branch> with a new branch of the
same name. When the --onto option is provided the new branch starts
out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
It then attempts to create a new commit for each commit from the original
<branch> that does not exist in the <upstream> branch.
It is possible that a merge failure will prevent this process from being
completely automatic. You will have to resolve any such merge failure
and run git rebase --continue. Another option is to bypass the commit
that caused the merge failure with git rebase --skip. To restore the
original <branch> and remove the .git/rebase-apply working files, use the
command git rebase --abort instead.
Note that if <branch> is not specified on the command line, the
currently checked out branch is used.
Example: git-rebase master~1 topic
A---B---C topic A'\''--B'\''--C'\'' topic
/ --> /
D---E---F---G master D---E---F---G master
'
SUBDIRECTORY_OK=Yes
OPTIONS_SPEC=
. git-sh-setup
set_reflog_action rebase
require_work_tree
cd_to_toplevel
OK_TO_SKIP_PRE_REBASE=
RESOLVEMSG="
When you have resolved this problem run \"git rebase --continue\".
If you would prefer to skip this patch, instead run \"git rebase --skip\".
To restore the original branch and stop rebasing run \"git rebase --abort\".
"
unset newbase
strategy=recursive
do_merge=
dotest="$GIT_DIR"/rebase-merge
prec=4
verbose=
diffstat=$(git config --bool rebase.stat)
git_am_opt=
rebase_root=
continue_merge () {
test -n "$prev_head" || die "prev_head must be defined"
test -d "$dotest" || die "$dotest directory does not exist"
unmerged=$(git ls-files -u)
if test -n "$unmerged"
then
echo "You still have unmerged paths in your index"
echo "did you forget to use git add?"
die "$RESOLVEMSG"
fi
cmt=`cat "$dotest/current"`
if ! git diff-index --quiet --ignore-submodules HEAD --
then
if ! git commit --no-verify -C "$cmt"
then
echo "Commit failed, please do not call \"git commit\""
echo "directly, but instead do one of the following: "
die "$RESOLVEMSG"
fi
printf "Committed: %0${prec}d " $msgnum
else
printf "Already applied: %0${prec}d " $msgnum
fi
git rev-list --pretty=oneline -1 "$cmt" | sed -e 's/^[^ ]* //'
prev_head=`git rev-parse HEAD^0`
# save the resulting commit so we can read-tree on it later
echo "$prev_head" > "$dotest/prev_head"
# onto the next patch:
msgnum=$(($msgnum + 1))
echo "$msgnum" >"$dotest/msgnum"
}
call_merge () {
cmt="$(cat "$dotest/cmt.$1")"
echo "$cmt" > "$dotest/current"
hd=$(git rev-parse --verify HEAD)
cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
msgnum=$(cat "$dotest/msgnum")
end=$(cat "$dotest/end")
eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
eval GITHEAD_$hd='$(cat "$dotest/onto_name")'
export GITHEAD_$cmt GITHEAD_$hd
git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
rv=$?
case "$rv" in
0)
unset GITHEAD_$cmt GITHEAD_$hd
return
;;
1)
git rerere
die "$RESOLVEMSG"
;;
2)
echo "Strategy: $rv $strategy failed, try another" 1>&2
die "$RESOLVEMSG"
;;
*)
die "Unknown exit code ($rv) from command:" \
"git-merge-$strategy $cmt^ -- HEAD $cmt"
;;
esac
}
move_to_original_branch () {
test -z "$head_name" &&
head_name="$(cat "$dotest"/head-name)" &&
onto="$(cat "$dotest"/onto)" &&
orig_head="$(cat "$dotest"/orig-head)"
case "$head_name" in
refs/*)
message="rebase finished: $head_name onto $onto"
git update-ref -m "$message" \
$head_name $(git rev-parse HEAD) $orig_head &&
git symbolic-ref HEAD $head_name ||
die "Could not move back to $head_name"
;;
esac
}
finish_rb_merge () {
move_to_original_branch
rm -r "$dotest"
echo "All done."
}
is_interactive () {
while test $# != 0
do
case "$1" in
-i|--interactive)
interactive_rebase=explicit
break
;;
-p|--preserve-merges)
interactive_rebase=implied
;;
esac
shift
done
if [ "$interactive_rebase" = implied ]; then
GIT_EDITOR=:
export GIT_EDITOR
fi
test -n "$interactive_rebase" || test -f "$dotest"/interactive
}
run_pre_rebase_hook () {
if test -z "$OK_TO_SKIP_PRE_REBASE" &&
test -x "$GIT_DIR/hooks/pre-rebase"
then
"$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
echo >&2 "The pre-rebase hook refused to rebase."
exit 1
}
fi
}
test -f "$GIT_DIR"/rebase-apply/applying &&
die 'It looks like git-am is in progress. Cannot rebase.'
is_interactive "$@" && exec git-rebase--interactive "$@"
if test $# -eq 0
then
test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply || usage
test -d "$dotest" -o -f "$GIT_DIR"/rebase-apply/rebasing &&
die 'A rebase is in progress, try --continue, --skip or --abort.'
die "No arguments given and $GIT_DIR/rebase-apply already exists."
fi
while test $# != 0
do
case "$1" in
--no-verify)
OK_TO_SKIP_PRE_REBASE=yes
;;
--continue)
test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
die "No rebase in progress?"
git diff-files --quiet --ignore-submodules || {
echo "You must edit all merge conflicts and then"
echo "mark them as resolved using git add"
exit 1
}
if test -d "$dotest"
then
prev_head=$(cat "$dotest/prev_head")
end=$(cat "$dotest/end")
msgnum=$(cat "$dotest/msgnum")
onto=$(cat "$dotest/onto")
continue_merge
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
exit
fi
head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
git am --resolved --3way --resolvemsg="$RESOLVEMSG" &&
move_to_original_branch
exit
;;
--skip)
test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
die "No rebase in progress?"
git reset --hard HEAD || exit $?
if test -d "$dotest"
then
git rerere clear
prev_head=$(cat "$dotest/prev_head")
end=$(cat "$dotest/end")
msgnum=$(cat "$dotest/msgnum")
msgnum=$(($msgnum + 1))
onto=$(cat "$dotest/onto")
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
exit
fi
head_name=$(cat "$GIT_DIR"/rebase-apply/head-name) &&
onto=$(cat "$GIT_DIR"/rebase-apply/onto) &&
orig_head=$(cat "$GIT_DIR"/rebase-apply/orig-head) &&
git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
move_to_original_branch
exit
;;
--abort)
test -d "$dotest" -o -d "$GIT_DIR"/rebase-apply ||
die "No rebase in progress?"
git rerere clear
if test -d "$dotest"
then
move_to_original_branch
else
dotest="$GIT_DIR"/rebase-apply
move_to_original_branch
fi
git reset --hard $(cat "$dotest/orig-head")
rm -r "$dotest"
exit
;;
--onto)
test 2 -le "$#" || usage
newbase="$2"
shift
;;
-M|-m|--m|--me|--mer|--merg|--merge)
do_merge=t
;;
-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
--strateg=*|--strategy=*|\
-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
case "$#,$1" in
*,*=*)
strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
1,*)
usage ;;
*)
strategy="$2"
shift ;;
esac
do_merge=t
;;
-n|--no-stat)
diffstat=
;;
--stat)
diffstat=t
;;
-v|--verbose)
verbose=t
diffstat=t
;;
--whitespace=*)
git_am_opt="$git_am_opt $1"
;;
-C*)
git_am_opt="$git_am_opt $1"
;;
--root)
rebase_root=t
;;
-*)
usage
;;
*)
break
;;
esac
shift
done
test $# -gt 2 && usage
# Make sure we do not have $GIT_DIR/rebase-apply
if test -z "$do_merge"
then
if mkdir "$GIT_DIR"/rebase-apply 2>/dev/null
then
rmdir "$GIT_DIR"/rebase-apply
else
echo >&2 '
It seems that I cannot create a rebase-apply directory, and
I wonder if you are in the middle of patch application or another
rebase. If that is not the case, please
rm -fr '"$GIT_DIR"'/rebase-apply
and run me again. I am stopping in case you still have something
valuable there.'
exit 1
fi
else
if test -d "$dotest"
then
die "previous rebase directory $dotest still exists." \
'Try git rebase (--continue | --abort | --skip)'
fi
fi
# The tree must be really really clean.
if ! git update-index --ignore-submodules --refresh; then
echo >&2 "cannot rebase: you have unstaged changes"
exit 1
fi
diff=$(git diff-index --cached --name-status -r --ignore-submodules HEAD --)
case "$diff" in
?*) echo >&2 "cannot rebase: your index contains uncommitted changes"
echo >&2 "$diff"
exit 1
;;
esac
if test -z "$rebase_root"
then
# The upstream head must be given. Make sure it is valid.
upstream_name="$1"
shift
upstream=`git rev-parse --verify "${upstream_name}^0"` ||
die "invalid upstream $upstream_name"
unset root_flag
upstream_arg="$upstream_name"
else
test -z "$newbase" && die "--root must be used with --onto"
unset upstream_name
unset upstream
root_flag="--root"
upstream_arg="$root_flag"
fi
# Make sure the branch to rebase onto is valid.
onto_name=${newbase-"$upstream_name"}
onto=$(git rev-parse --verify "${onto_name}^0") || exit
# If a hook exists, give it a chance to interrupt
run_pre_rebase_hook "$upstream_arg" "$@"
# If the branch to rebase is given, that is the branch we will rebase
# $branch_name -- branch being rebased, or HEAD (already detached)
# $orig_head -- commit object name of tip of the branch before rebasing
# $head_name -- refs/heads/<that-branch> or "detached HEAD"
switch_to=
case "$#" in
1)
# Is it "rebase other $branchname" or "rebase other $commit"?
branch_name="$1"
switch_to="$1"
if git show-ref --verify --quiet -- "refs/heads/$1" &&
branch=$(git rev-parse -q --verify "refs/heads/$1")
then
head_name="refs/heads/$1"
elif branch=$(git rev-parse -q --verify "$1")
then
head_name="detached HEAD"
else
usage
fi
;;
*)
# Do not need to switch branches, we are already on it.
if branch_name=`git symbolic-ref -q HEAD`
then
head_name=$branch_name
branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
else
head_name="detached HEAD"
branch_name=HEAD ;# detached
fi
branch=$(git rev-parse --verify "${branch_name}^0") || exit
;;
esac
orig_head=$branch
# Now we are rebasing commits $upstream..$branch (or with --root,
# everything leading up to $branch) on top of $onto
# Check if we are already based on $onto with linear history,
# but this should be done only when upstream and onto are the same.
mb=$(git merge-base "$onto" "$branch")
if test "$upstream" = "$onto" && test "$mb" = "$onto" &&
# linear history?
! (git rev-list --parents "$onto".."$branch" | grep " .* ") > /dev/null
then
# Lazily switch to the target branch if needed...
test -z "$switch_to" || git checkout "$switch_to"
echo >&2 "Current branch $branch_name is up to date."
exit 0
fi
# Detach HEAD and reset the tree
echo "First, rewinding head to replay your work on top of it..."
git checkout -q "$onto^0" || die "could not detach HEAD"
git update-ref ORIG_HEAD $branch
if test -n "$diffstat"
then
if test -n "$verbose"
then
echo "Changes from $mb to $onto:"
fi
# We want color (if set), but no pager
GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
fi
# If the $onto is a proper descendant of the tip of the branch, then
# we just fast forwarded.
if test "$mb" = "$branch"
then
echo >&2 "Fast-forwarded $branch_name to $onto_name."
move_to_original_branch
exit 0
fi
if test -n "$rebase_root"
then
revisions="$onto..$orig_head"
else
revisions="$upstream..$orig_head"
fi
if test -z "$do_merge"
then
git format-patch -k --stdout --full-index --ignore-if-in-upstream \
$root_flag "$revisions" |
git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" &&
move_to_original_branch
ret=$?
test 0 != $ret -a -d "$GIT_DIR"/rebase-apply &&
echo $head_name > "$GIT_DIR"/rebase-apply/head-name &&
echo $onto > "$GIT_DIR"/rebase-apply/onto &&
echo $orig_head > "$GIT_DIR"/rebase-apply/orig-head
exit $ret
fi
# start doing a rebase with git-merge
# this is rename-aware if the recursive (default) strategy is used
mkdir -p "$dotest"
echo "$onto" > "$dotest/onto"
echo "$onto_name" > "$dotest/onto_name"
prev_head=$orig_head
echo "$prev_head" > "$dotest/prev_head"
echo "$orig_head" > "$dotest/orig-head"
echo "$head_name" > "$dotest/head-name"
msgnum=0
for cmt in `git rev-list --reverse --no-merges "$revisions"`
do
msgnum=$(($msgnum + 1))
echo "$cmt" > "$dotest/cmt.$msgnum"
done
echo 1 >"$dotest/msgnum"
echo $msgnum >"$dotest/end"
end=$msgnum
msgnum=1
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge