git-commit-vandalism/git-rebase.sh

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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano.
#
USAGE='[--interactive | -i] [-v] [--force-rebase | -f] [--no-ff] [--onto <newbase>] (<upstream>|--root) [<branch>] [--quiet | -q]'
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
LF='
'
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 onto
strategy=recursive
strategy_opts=
do_merge=
merge_dir="$GIT_DIR"/rebase-merge
apply_dir="$GIT_DIR"/rebase-apply
prec=4
verbose=
diffstat=
test "$(git config --bool rebase.stat)" = true && diffstat=t
git_am_opt=
rebase_root=
force_rebase=
allow_rerere_autoupdate=
# Non-empty if a rebase was in progress when 'git rebase' was invoked
in_progress=
# One of {am, merge, interactive}
type=
# One of {"$GIT_DIR"/rebase-apply, "$GIT_DIR"/rebase-merge}
state_dir=
# One of {'', continue, skip, abort}, as parsed from command line
action=
rebase: refactor reading of state The code reading the state saved in $merge_dir or $rebase_dir is currently spread out in many places, making it harder to read and to introduce additional state. Extract this code into one method that reads the state. Only extract the code associated with the state that is written when the rebase is initiated. Leave the state that changes for each commmit, at least for now. Currently, when resuming a merge-based rebase using --continue or --skip, move_to_original_branch (via finish_rb_merge) will be called without head_name and orig_head set. These variables are then lazily read in move_to_original_branch if head_name is not set (together with onto, which is unnecessarily read again). Change this by always eagerly reading the state, for both am-based and merge-based rebase, in the --continue and --skip cases. Note that this does not change the behavior for am-based rebase, which read the state eagerly even before this commit. Reading the state eagerly means that part of the state will sometimes be read unnecessarily. One example is when the rebase is continued, but stops again at another merge conflict. Another example is when the rebase is aborted. However, since both of these cases involve user interaction, the delay is hopefully not noticeable. The call_merge/continue_merge loop is not affected. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-02-06 19:43:31 +01:00
read_state () {
if test "$type" = merge
rebase: refactor reading of state The code reading the state saved in $merge_dir or $rebase_dir is currently spread out in many places, making it harder to read and to introduce additional state. Extract this code into one method that reads the state. Only extract the code associated with the state that is written when the rebase is initiated. Leave the state that changes for each commmit, at least for now. Currently, when resuming a merge-based rebase using --continue or --skip, move_to_original_branch (via finish_rb_merge) will be called without head_name and orig_head set. These variables are then lazily read in move_to_original_branch if head_name is not set (together with onto, which is unnecessarily read again). Change this by always eagerly reading the state, for both am-based and merge-based rebase, in the --continue and --skip cases. Note that this does not change the behavior for am-based rebase, which read the state eagerly even before this commit. Reading the state eagerly means that part of the state will sometimes be read unnecessarily. One example is when the rebase is continued, but stops again at another merge conflict. Another example is when the rebase is aborted. However, since both of these cases involve user interaction, the delay is hopefully not noticeable. The call_merge/continue_merge loop is not affected. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-02-06 19:43:31 +01:00
then
onto_name=$(cat "$state_dir"/onto_name) &&
end=$(cat "$state_dir"/end) &&
msgnum=$(cat "$state_dir"/msgnum)
rebase: refactor reading of state The code reading the state saved in $merge_dir or $rebase_dir is currently spread out in many places, making it harder to read and to introduce additional state. Extract this code into one method that reads the state. Only extract the code associated with the state that is written when the rebase is initiated. Leave the state that changes for each commmit, at least for now. Currently, when resuming a merge-based rebase using --continue or --skip, move_to_original_branch (via finish_rb_merge) will be called without head_name and orig_head set. These variables are then lazily read in move_to_original_branch if head_name is not set (together with onto, which is unnecessarily read again). Change this by always eagerly reading the state, for both am-based and merge-based rebase, in the --continue and --skip cases. Note that this does not change the behavior for am-based rebase, which read the state eagerly even before this commit. Reading the state eagerly means that part of the state will sometimes be read unnecessarily. One example is when the rebase is continued, but stops again at another merge conflict. Another example is when the rebase is aborted. However, since both of these cases involve user interaction, the delay is hopefully not noticeable. The call_merge/continue_merge loop is not affected. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-02-06 19:43:31 +01:00
fi &&
head_name=$(cat "$state_dir"/head-name) &&
onto=$(cat "$state_dir"/onto) &&
orig_head=$(cat "$state_dir"/orig-head) &&
GIT_QUIET=$(cat "$state_dir"/quiet)
}
continue_merge () {
test -d "$merge_dir" || die "$merge_dir directory does not exist"
unmerged=$(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 "$merge_dir/current"`
if ! git diff-index --quiet --ignore-submodules HEAD --
then
if ! git commit --no-verify -C "$cmt"
then
echo "Commit failed, please do not call \"git commit\""
echo "directly, but instead do one of the following: "
die "$resolvemsg"
fi
if test -z "$GIT_QUIET"
then
printf "Committed: %0${prec}d " $msgnum
fi
echo "$cmt $(git rev-parse HEAD^0)" >> "$merge_dir/rewritten"
else
if test -z "$GIT_QUIET"
then
printf "Already applied: %0${prec}d " $msgnum
fi
fi
test -z "$GIT_QUIET" &&
GIT_PAGER='' git log --format=%s -1 "$cmt"
# onto the next patch:
msgnum=$(($msgnum + 1))
echo "$msgnum" >"$merge_dir/msgnum"
}
call_merge () {
cmt="$(cat "$merge_dir/cmt.$1")"
echo "$cmt" > "$merge_dir/current"
hd=$(git rev-parse --verify HEAD)
cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
msgnum=$(cat "$merge_dir/msgnum")
eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
eval GITHEAD_$hd='$onto_name'
export GITHEAD_$cmt GITHEAD_$hd
if test -n "$GIT_QUIET"
then
GIT_MERGE_VERBOSITY=1 && export GIT_MERGE_VERBOSITY
fi
eval 'git-merge-$strategy' $strategy_opts '"$cmt^" -- "$hd" "$cmt"'
rv=$?
case "$rv" in
0)
unset GITHEAD_$cmt GITHEAD_$hd
return
;;
1)
git rerere $allow_rerere_autoupdate
die "$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 $cmt"
;;
esac
}
move_to_original_branch () {
case "$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 $head_name"
;;
esac
}
finish_rb_merge () {
move_to_original_branch
git notes copy --for-rewrite=rebase < "$merge_dir"/rewritten
if test -x "$GIT_DIR"/hooks/post-rewrite &&
test -s "$merge_dir"/rewritten; then
"$GIT_DIR"/hooks/post-rewrite rebase < "$merge_dir"/rewritten
fi
rm -r "$merge_dir"
say 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 "$interactive_rebase" || test -f "$merge_dir"/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" ${1+"$@"} ||
die "The pre-rebase hook refused to rebase."
fi
}
test -f "$apply_dir"/applying &&
die 'It looks like git-am is in progress. Cannot rebase.'
is_interactive "$@" && exec git-rebase--interactive "$@"
if test -d "$apply_dir"
then
type=am
state_dir="$apply_dir"
elif test -d "$merge_dir"
then
if test -f "$merge_dir"/interactive
then
type=interactive
interactive_rebase=explicit
else
type=merge
fi
state_dir="$merge_dir"
fi
test -n "$type" && in_progress=t
total_argc=$#
while test $# != 0
do
case "$1" in
--no-verify)
ok_to_skip_pre_rebase=yes
;;
--verify)
ok_to_skip_pre_rebase=
;;
--continue|--skip|--abort)
test $total_argc -eq 1 || usage
action=${1##--}
;;
--onto)
test 2 -le "$#" || usage
onto="$2"
shift
;;
-M|-m|--m|--me|--mer|--merg|--merge)
do_merge=t
;;
-X*|--strategy-option*)
case "$#,$1" in
1,-X|1,--strategy-option)
usage ;;
*,-X|*,--strategy-option)
newopt="$2"
shift ;;
*,--strategy-option=*)
newopt="$(expr " $1" : ' --strategy-option=\(.*\)')" ;;
*,-X*)
newopt="$(expr " $1" : ' -X\(.*\)')" ;;
1,*)
usage ;;
esac
strategy_opts="$strategy_opts $(git rev-parse --sq-quote "--$newopt")"
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="$2"
shift ;;
esac
do_merge=t
;;
-n|--no-stat)
diffstat=
;;
--stat)
diffstat=t
;;
-v|--verbose)
verbose=t
diffstat=t
GIT_QUIET=
;;
-q|--quiet)
GIT_QUIET=t
git_am_opt="$git_am_opt -q"
verbose=
diffstat=
;;
--whitespace=*)
git_am_opt="$git_am_opt $1"
case "$1" in
--whitespace=fix|--whitespace=strip)
force_rebase=t
;;
esac
;;
--ignore-whitespace)
git_am_opt="$git_am_opt $1"
;;
--committer-date-is-author-date|--ignore-date)
git_am_opt="$git_am_opt $1"
force_rebase=t
;;
-C*)
git_am_opt="$git_am_opt $1"
;;
--root)
rebase_root=t
;;
-f|--f|--fo|--for|--forc|--force|--force-r|--force-re|--force-reb|--force-reba|--force-rebas|--force-rebase|--no-ff)
force_rebase=t
;;
--rerere-autoupdate|--no-rerere-autoupdate)
allow_rerere_autoupdate="$1"
;;
-*)
usage
;;
*)
break
;;
esac
shift
done
test $# -gt 2 && usage
test -n "$action" && test -z "$in_progress" && die "No rebase in progress?"
case "$action" in
continue)
git update-index --ignore-submodules --refresh &&
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
}
read_state
if test -d "$merge_dir"
then
continue_merge
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
exit
fi
git am --resolved --3way --resolvemsg="$resolvemsg" &&
move_to_original_branch
exit
;;
skip)
git reset --hard HEAD || exit $?
read_state
if test -d "$merge_dir"
then
git rerere clear
msgnum=$(($msgnum + 1))
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge
exit
fi
git am -3 --skip --resolvemsg="$resolvemsg" &&
move_to_original_branch
exit
;;
abort)
git rerere clear
read_state
case "$head_name" in
refs/*)
git symbolic-ref HEAD $head_name ||
die "Could not move back to $head_name"
;;
esac
git reset --hard $orig_head
rm -r "$state_dir"
exit
;;
esac
# Make sure no rebase is in progress
if test -n "$in_progress"
then
die '
It seems that there is already a '"${state_dir##*/}"' directory, and
I wonder if you are in the middle of another rebase. If that is the
case, please try
git rebase (--continue | --abort | --skip)
If that is not the case, please
rm -fr '"$state_dir"'
and run me again. I am stopping in case you still have something
valuable there.'
fi
test $# -eq 0 && test -z "$rebase_root" && usage
require_clean_work_tree "rebase" "Please commit or stash them."
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 "$onto" && die "--root must be used with --onto"
unset upstream_name
unset upstream
root_flag="--root"
upstream_arg="$root_flag"
fi
# Make sure the branch to rebase onto is valid.
onto_name=${onto-"$upstream_name"}
case "$onto_name" in
*...*)
if left=${onto_name%...*} right=${onto_name#*...} &&
onto=$(git merge-base --all ${left:-HEAD} ${right:-HEAD})
then
case "$onto" in
?*"$LF"?*)
die "$onto_name: there are more than one merge bases"
;;
'')
die "$onto_name: there is no merge base"
;;
esac
else
die "$onto_name: there is no merge base"
fi
;;
*)
onto=$(git rev-parse --verify "${onto_name}^0") || exit
;;
esac
# 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
echo >&2 "fatal: no such branch: $1"
usage
fi
;;
*)
# Do not need to switch branches, we are already on it.
if branch_name=`git symbolic-ref -q HEAD`
then
head_name=$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" | sane_grep " .* ") > /dev/null
then
if test -z "$force_rebase"
then
# Lazily switch to the target branch if needed...
test -z "$switch_to" || git checkout "$switch_to" --
say "Current branch $branch_name is up to date."
exit 0
else
say "Current branch $branch_name is up to date, rebase forced."
fi
fi
# Detach HEAD and reset the tree
say "First, rewinding head to replay your work on top of it..."
git checkout -q "$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
say "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 \
--src-prefix=a/ --dst-prefix=b/ \
--no-renames $root_flag "$revisions" |
git am $git_am_opt --rebasing --resolvemsg="$resolvemsg" &&
move_to_original_branch
ret=$?
test 0 != $ret -a -d "$apply_dir" &&
echo $head_name > "$apply_dir/head-name" &&
echo $onto > "$apply_dir/onto" &&
echo $orig_head > "$apply_dir/orig-head" &&
echo "$GIT_QUIET" > "$apply_dir/quiet"
exit $ret
fi
# start doing a rebase with git-merge
# this is rename-aware if the recursive (default) strategy is used
mkdir -p "$merge_dir"
echo "$onto_name" > "$merge_dir/onto_name"
echo "$head_name" > "$merge_dir/head-name"
rebase: refactor reading of state The code reading the state saved in $merge_dir or $rebase_dir is currently spread out in many places, making it harder to read and to introduce additional state. Extract this code into one method that reads the state. Only extract the code associated with the state that is written when the rebase is initiated. Leave the state that changes for each commmit, at least for now. Currently, when resuming a merge-based rebase using --continue or --skip, move_to_original_branch (via finish_rb_merge) will be called without head_name and orig_head set. These variables are then lazily read in move_to_original_branch if head_name is not set (together with onto, which is unnecessarily read again). Change this by always eagerly reading the state, for both am-based and merge-based rebase, in the --continue and --skip cases. Note that this does not change the behavior for am-based rebase, which read the state eagerly even before this commit. Reading the state eagerly means that part of the state will sometimes be read unnecessarily. One example is when the rebase is continued, but stops again at another merge conflict. Another example is when the rebase is aborted. However, since both of these cases involve user interaction, the delay is hopefully not noticeable. The call_merge/continue_merge loop is not affected. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-02-06 19:43:31 +01:00
echo "$onto" > "$merge_dir/onto"
echo "$orig_head" > "$merge_dir/orig-head"
echo "$GIT_QUIET" > "$merge_dir/quiet"
msgnum=0
for cmt in `git rev-list --reverse --no-merges "$revisions"`
do
msgnum=$(($msgnum + 1))
echo "$cmt" > "$merge_dir/cmt.$msgnum"
done
echo 1 >"$merge_dir/msgnum"
echo $msgnum >"$merge_dir/end"
end=$msgnum
msgnum=1
while test "$msgnum" -le "$end"
do
call_merge "$msgnum"
continue_merge
done
finish_rb_merge