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#!/bin/sh
#
# Copyright (c) 2006 Johannes E. Schindelin

# SHORT DESCRIPTION
#
# This script makes it easy to fix up commits in the middle of a series,
# and rearrange commits.
#
# The original idea comes from Eric W. Biederman, in
# http://article.gmane.org/gmane.comp.version-control.git/22407

OPTIONS_KEEPDASHDASH=
OPTIONS_SPEC="\
git-rebase [-i] [options] [--] <upstream> [<branch>]
git-rebase [-i] (--continue | --abort | --skip)
--
Available options are
v,verbose display a diffstat of what changed upstream
onto= rebase onto given branch instead of upstream
p,preserve-merges try to recreate merges instead of ignoring them
s,strategy= use the given merge strategy
m,merge always used (no-op)
i,interactive always used (no-op)
Actions:
continue continue rebasing process
abort abort rebasing process and restore original branch
skip skip current patch and continue rebasing process
no-verify override pre-rebase hook from stopping the operation
root rebase all reachable commmits up to the root(s)
"

. git-sh-setup
require_work_tree

DOTEST="$GIT_DIR/rebase-merge"
TODO="$DOTEST"/git-rebase-todo
DONE="$DOTEST"/done
MSG="$DOTEST"/message
SQUASH_MSG="$DOTEST"/message-squash
REWRITTEN="$DOTEST"/rewritten
DROPPED="$DOTEST"/dropped
PRESERVE_MERGES=
STRATEGY=
ONTO=
VERBOSE=
OK_TO_SKIP_PRE_REBASE=
REBASE_ROOT=

GIT_CHERRY_PICK_HELP=" After resolving the conflicts,
mark the corrected paths with 'git add <paths>', and
run 'git rebase --continue'"
export GIT_CHERRY_PICK_HELP

warn () {
echo "$*" >&2
}

output () {
case "$VERBOSE" in
'')
output=$("$@" 2>&1 )
status=$?
test $status != 0 && printf "%s\n" "$output"
return $status
;;
*)
"$@"
;;
esac
}

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
}

require_clean_work_tree () {
# test if working tree is dirty
git rev-parse --verify HEAD > /dev/null &&
git update-index --ignore-submodules --refresh &&
git diff-files --quiet --ignore-submodules &&
git diff-index --cached --quiet HEAD --ignore-submodules -- ||
die "Working tree is dirty"
}

ORIG_REFLOG_ACTION="$GIT_REFLOG_ACTION"

comment_for_reflog () {
case "$ORIG_REFLOG_ACTION" in
''|rebase*)
GIT_REFLOG_ACTION="rebase -i ($1)"
export GIT_REFLOG_ACTION
;;
esac
}

last_count=
mark_action_done () {
sed -e 1q < "$TODO" >> "$DONE"
sed -e 1d < "$TODO" >> "$TODO".new
mv -f "$TODO".new "$TODO"
count=$(grep -c '^[^#]' < "$DONE")
total=$(($count+$(grep -c '^[^#]' < "$TODO")))
if test "$last_count" != "$count"
then
last_count=$count
printf "Rebasing (%d/%d)\r" $count $total
test -z "$VERBOSE" || echo
fi
}

make_patch () {
sha1_and_parents="$(git rev-list --parents -1 "$1")"
case "$sha1_and_parents" in
?*' '?*' '?*)
git diff --cc $sha1_and_parents
;;
?*' '?*)
git diff-tree -p "$1^!"
;;
*)
echo "Root commit"
;;
esac > "$DOTEST"/patch
test -f "$DOTEST"/message ||
git cat-file commit "$1" | sed "1,/^$/d" > "$DOTEST"/message
test -f "$DOTEST"/author-script ||
get_author_ident_from_commit "$1" > "$DOTEST"/author-script
}

die_with_patch () {
make_patch "$1"
git rerere
die "$2"
}

die_abort () {
rm -rf "$DOTEST"
die "$1"
}

has_action () {
grep '^[^#]' "$1" >/dev/null
}

pick_one () {
no_ff=
case "$1" in -n) sha1=$2; no_ff=t ;; *) sha1=$1 ;; esac
output git rev-parse --verify $sha1 || die "Invalid commit name: $sha1"
test -d "$REWRITTEN" &&
pick_one_preserving_merges "$@" && return
if test ! -z "$REBASE_ROOT"
then
output git cherry-pick "$@"
return
fi
parent_sha1=$(git rev-parse --verify $sha1^) ||
die "Could not get the parent of $sha1"
current_sha1=$(git rev-parse --verify HEAD)
if test "$no_ff$current_sha1" = "$parent_sha1"; then
output git reset --hard $sha1
test "a$1" = a-n && output git reset --soft $current_sha1
sha1=$(git rev-parse --short $sha1)
output warn Fast forward to $sha1
else
output git cherry-pick "$@"
fi
}

pick_one_preserving_merges () {
fast_forward=t
case "$1" in
-n)
fast_forward=f
sha1=$2
;;
*)
sha1=$1
;;
esac
sha1=$(git rev-parse $sha1)

if test -f "$DOTEST"/current-commit
then
if test "$fast_forward" = t
then
cat "$DOTEST"/current-commit | while read current_commit
do
git rev-parse HEAD > "$REWRITTEN"/$current_commit
done
rm "$DOTEST"/current-commit ||
die "Cannot write current commit's replacement sha1"
fi
fi

echo $sha1 >> "$DOTEST"/current-commit

# rewrite parents; if none were rewritten, we can fast-forward.
new_parents=
pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
if test "$pend" = " "
then
pend=" root"
fi
while [ "$pend" != "" ]
do
p=$(expr "$pend" : ' \([^ ]*\)')
pend="${pend# $p}"

if test -f "$REWRITTEN"/$p
then
new_p=$(cat "$REWRITTEN"/$p)

# If the todo reordered commits, and our parent is marked for
# rewriting, but hasn't been gotten to yet, assume the user meant to
# drop it on top of the current HEAD
if test -z "$new_p"
then
new_p=$(git rev-parse HEAD)
fi

test $p != $new_p && fast_forward=f
case "$new_parents" in
*$new_p*)
;; # do nothing; that parent is already there
*)
new_parents="$new_parents $new_p"
;;
esac
else
if test -f "$DROPPED"/$p
then
fast_forward=f
replacement="$(cat "$DROPPED"/$p)"
test -z "$replacement" && replacement=root
pend=" $replacement$pend"
else
new_parents="$new_parents $p"
fi
fi
done
case $fast_forward in
t)
output warn "Fast forward to $sha1"
output git reset --hard $sha1 ||
die "Cannot fast forward to $sha1"
;;
f)
first_parent=$(expr "$new_parents" : ' \([^ ]*\)')

if [ "$1" != "-n" ]
then
# detach HEAD to current parent
output git checkout $first_parent 2> /dev/null ||
die "Cannot move HEAD to $first_parent"
fi

case "$new_parents" in
' '*' '*)
test "a$1" = a-n && die "Refusing to squash a merge: $sha1"

# redo merge
author_script=$(get_author_ident_from_commit $sha1)
eval "$author_script"
msg="$(git cat-file commit $sha1 | sed -e '1,/^$/d')"
# No point in merging the first parent, that's HEAD
new_parents=${new_parents# $first_parent}
if ! GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
output git merge $STRATEGY -m "$msg" \
$new_parents
then
printf "%s\n" "$msg" > "$GIT_DIR"/MERGE_MSG
die_with_patch $sha1 "Error redoing merge $sha1"
fi
;;
*)
output git cherry-pick "$@" ||
die_with_patch $sha1 "Could not pick $sha1"
;;
esac
;;
esac
}

nth_string () {
case "$1" in
*1[0-9]|*[04-9]) echo "$1"th;;
*1) echo "$1"st;;
*2) echo "$1"nd;;
*3) echo "$1"rd;;
esac
}

make_squash_message () {
if test -f "$SQUASH_MSG"; then
COUNT=$(($(sed -n "s/^# This is [^0-9]*\([1-9][0-9]*\).*/\1/p" \
< "$SQUASH_MSG" | sed -ne '$p')+1))
echo "# This is a combination of $COUNT commits."
sed -e 1d -e '2,/^./{
/^$/d
}' <"$SQUASH_MSG"
else
COUNT=2
echo "# This is a combination of two commits."
echo "# The first commit's message is:"
echo
git cat-file commit HEAD | sed -e '1,/^$/d'
fi
echo
echo "# This is the $(nth_string $COUNT) commit message:"
echo
git cat-file commit $1 | sed -e '1,/^$/d'
}

peek_next_command () {
sed -n "1s/ .*$//p" < "$TODO"
}

do_next () {
rm -f "$DOTEST"/message "$DOTEST"/author-script \
"$DOTEST"/amend || exit
read command sha1 rest < "$TODO"
case "$command" in
'#'*|''|noop)
mark_action_done
;;
pick|p)
comment_for_reflog pick

mark_action_done
pick_one $sha1 ||
die_with_patch $sha1 "Could not apply $sha1... $rest"
;;
edit|e)
comment_for_reflog edit

mark_action_done
pick_one $sha1 ||
die_with_patch $sha1 "Could not apply $sha1... $rest"
make_patch $sha1
git rev-parse --verify HEAD > "$DOTEST"/amend
warn "Stopped at $sha1... $rest"
warn "You can amend the commit now, with"
warn
warn " git commit --amend"
warn
warn "Once you are satisfied with your changes, run"
warn
warn " git rebase --continue"
warn
exit 0
;;
squash|s)
comment_for_reflog squash

test -f "$DONE" && has_action "$DONE" ||
die "Cannot 'squash' without a previous commit"

mark_action_done
make_squash_message $sha1 > "$MSG"
failed=f
author_script=$(get_author_ident_from_commit HEAD)
output git reset --soft HEAD^
pick_one -n $sha1 || failed=t
case "$(peek_next_command)" in
squash|s)
USE_OUTPUT=output
MSG_OPT=-F
EDIT_OR_FILE="$MSG"
cp "$MSG" "$SQUASH_MSG"
;;
*)
USE_OUTPUT=
MSG_OPT=
EDIT_OR_FILE=-e
rm -f "$SQUASH_MSG" || exit
cp "$MSG" "$GIT_DIR"/SQUASH_MSG
rm -f "$GIT_DIR"/MERGE_MSG || exit
;;
esac
echo "$author_script" > "$DOTEST"/author-script
if test $failed = f
then
# This is like --amend, but with a different message
eval "$author_script"
GIT_AUTHOR_NAME="$GIT_AUTHOR_NAME" \
GIT_AUTHOR_EMAIL="$GIT_AUTHOR_EMAIL" \
GIT_AUTHOR_DATE="$GIT_AUTHOR_DATE" \
$USE_OUTPUT git commit --no-verify \
$MSG_OPT "$EDIT_OR_FILE" || failed=t
fi
if test $failed = t
then
cp "$MSG" "$GIT_DIR"/MERGE_MSG
warn
warn "Could not apply $sha1... $rest"
die_with_patch $sha1 ""
fi
;;
*)
warn "Unknown command: $command $sha1 $rest"
die_with_patch $sha1 "Please fix this in the file $TODO."
;;
esac
test -s "$TODO" && return

comment_for_reflog finish &&
HEADNAME=$(cat "$DOTEST"/head-name) &&
OLDHEAD=$(cat "$DOTEST"/head) &&
SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
NEWHEAD=$(git rev-parse HEAD) &&
case $HEADNAME in
refs/*)
message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
git symbolic-ref HEAD $HEADNAME
;;
esac && {
test ! -f "$DOTEST"/verbose ||
git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
} &&
rm -rf "$DOTEST" &&
git gc --auto &&
warn "Successfully rebased and updated $HEADNAME."

exit
}

do_rest () {
while :
do
do_next
done
}

# check if no other options are set
is_standalone () {
test $# -eq 2 -a "$2" = '--' &&
test -z "$ONTO" &&
test -z "$PRESERVE_MERGES" &&
test -z "$STRATEGY" &&
test -z "$VERBOSE"
}

get_saved_options () {
test -d "$REWRITTEN" && PRESERVE_MERGES=t
test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
test -f "$DOTEST"/verbose && VERBOSE=t
test -f "$DOTEST"/rebase-root && REBASE_ROOT=t
}

while test $# != 0
do
case "$1" in
--no-verify)
OK_TO_SKIP_PRE_REBASE=yes
;;
--verify)
;;
--continue)
is_standalone "$@" || usage
get_saved_options
comment_for_reflog continue

test -d "$DOTEST" || die "No interactive rebase running"

# Sanity check
git rev-parse --verify HEAD >/dev/null ||
die "Cannot read HEAD"
git update-index --ignore-submodules --refresh &&
git diff-files --quiet --ignore-submodules ||
die "Working tree is dirty"

# do we have anything to commit?
if git diff-index --cached --quiet --ignore-submodules HEAD --
then
: Nothing to commit -- skip this
else
. "$DOTEST"/author-script ||
die "Cannot find the author identity"
amend=
if test -f "$DOTEST"/amend
then
amend=$(git rev-parse --verify HEAD)
test "$amend" = $(cat "$DOTEST"/amend) ||
die "\
You have uncommitted changes in your working tree. Please, commit them
first and then run 'git rebase --continue' again."
git reset --soft HEAD^ ||
die "Cannot rewind the HEAD"
fi
export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL GIT_AUTHOR_DATE &&
git commit --no-verify -F "$DOTEST"/message -e || {
test -n "$amend" && git reset --soft $amend
die "Could not commit staged changes."
}
fi

require_clean_work_tree
do_rest
;;
--abort)
is_standalone "$@" || usage
get_saved_options
comment_for_reflog abort

git rerere clear
test -d "$DOTEST" || die "No interactive rebase running"

HEADNAME=$(cat "$DOTEST"/head-name)
HEAD=$(cat "$DOTEST"/head)
case $HEADNAME in
refs/*)
git symbolic-ref HEAD $HEADNAME
;;
esac &&
output git reset --hard $HEAD &&
rm -rf "$DOTEST"
exit
;;
--skip)
is_standalone "$@" || usage
get_saved_options
comment_for_reflog skip

git rerere clear
test -d "$DOTEST" || die "No interactive rebase running"

output git reset --hard && do_rest
;;
-s)
case "$#,$1" in
*,*=*)
STRATEGY="-s "$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
1,*)
usage ;;
*)
STRATEGY="-s $2"
shift ;;
esac
;;
-m)
# we use merge anyway
;;
-v)
VERBOSE=t
;;
-p)
PRESERVE_MERGES=t
;;
-i)
# yeah, we know
;;
--root)
REBASE_ROOT=t
;;
--onto)
shift
ONTO=$(git rev-parse --verify "$1") ||
die "Does not point to a valid commit: $1"
;;
--)
shift
test -z "$REBASE_ROOT" -a $# -ge 1 -a $# -le 2 ||
test ! -z "$REBASE_ROOT" -a $# -le 1 || usage
test -d "$DOTEST" &&
die "Interactive rebase already started"

git var GIT_COMMITTER_IDENT >/dev/null ||
die "You need to set your committer info first"

if test -z "$REBASE_ROOT"
then
UPSTREAM_ARG="$1"
UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
test -z "$ONTO" && ONTO=$UPSTREAM
shift
else
UPSTREAM=
UPSTREAM_ARG=--root
test -z "$ONTO" &&
die "You must specify --onto when using --root"
fi
run_pre_rebase_hook "$UPSTREAM_ARG" "$@"

comment_for_reflog start

require_clean_work_tree

if test ! -z "$1"
then
output git show-ref --verify --quiet "refs/heads/$1" ||
die "Invalid branchname: $1"
output git checkout "$1" ||
die "Could not checkout $1"
fi

HEAD=$(git rev-parse --verify HEAD) || die "No HEAD?"
mkdir "$DOTEST" || die "Could not create temporary $DOTEST"

: > "$DOTEST"/interactive || die "Could not mark as interactive"
git symbolic-ref HEAD > "$DOTEST"/head-name 2> /dev/null ||
echo "detached HEAD" > "$DOTEST"/head-name

echo $HEAD > "$DOTEST"/head
case "$REBASE_ROOT" in
'')
rm -f "$DOTEST"/rebase-root ;;
*)
: >"$DOTEST"/rebase-root ;;
esac
echo $ONTO > "$DOTEST"/onto
test -z "$STRATEGY" || echo "$STRATEGY" > "$DOTEST"/strategy
test t = "$VERBOSE" && : > "$DOTEST"/verbose
if test t = "$PRESERVE_MERGES"
then
# $REWRITTEN contains files for each commit that is
# reachable by at least one merge base of $HEAD and
# $UPSTREAM. They are not necessarily rewritten, but
# their children might be.
# This ensures that commits on merged, but otherwise
# unrelated side branches are left alone. (Think "X"
# in the man page's example.)
if test -z "$REBASE_ROOT"
then
mkdir "$REWRITTEN" &&
for c in $(git merge-base --all $HEAD $UPSTREAM)
do
echo $ONTO > "$REWRITTEN"/$c ||
die "Could not init rewritten commits"
done
else
mkdir "$REWRITTEN" &&
echo $ONTO > "$REWRITTEN"/root ||
die "Could not init rewritten commits"
fi
# No cherry-pick because our first pass is to determine
# parents to rewrite and skipping dropped commits would
# prematurely end our probe
MERGES_OPTION=
first_after_upstream="$(git rev-list --reverse --first-parent $UPSTREAM..$HEAD | head -n 1)"
else
MERGES_OPTION="--no-merges --cherry-pick"
fi

SHORTHEAD=$(git rev-parse --short $HEAD)
SHORTONTO=$(git rev-parse --short $ONTO)
if test -z "$REBASE_ROOT"
# this is now equivalent to ! -z "$UPSTREAM"
then
SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
REVISIONS=$UPSTREAM...$HEAD
SHORTREVISIONS=$SHORTUPSTREAM..$SHORTHEAD
else
REVISIONS=$ONTO...$HEAD
SHORTREVISIONS=$SHORTHEAD
fi
git rev-list $MERGES_OPTION --pretty=oneline --abbrev-commit \
--abbrev=7 --reverse --left-right --topo-order \
$REVISIONS | \
sed -n "s/^>//p" | while read shortsha1 rest
do
if test t != "$PRESERVE_MERGES"
then
echo "pick $shortsha1 $rest" >> "$TODO"
else
sha1=$(git rev-parse $shortsha1)
if test -z "$REBASE_ROOT"
then
preserve=t
for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)
do
if test -f "$REWRITTEN"/$p -a \( $p != $UPSTREAM -o $sha1 = $first_after_upstream \)
then
preserve=f
fi
done
else
preserve=f
fi
if test f = "$preserve"
then
touch "$REWRITTEN"/$sha1
echo "pick $shortsha1 $rest" >> "$TODO"
fi
fi
done

# Watch for commits that been dropped by --cherry-pick
if test t = "$PRESERVE_MERGES"
then
mkdir "$DROPPED"
# Save all non-cherry-picked changes
git rev-list $REVISIONS --left-right --cherry-pick | \
sed -n "s/^>//p" > "$DOTEST"/not-cherry-picks
# Now all commits and note which ones are missing in
# not-cherry-picks and hence being dropped
git rev-list $REVISIONS |
while read rev
do
if test -f "$REWRITTEN"/$rev -a "$(grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
then
# Use -f2 because if rev-list is telling us this commit is
# not worthwhile, we don't want to track its multiple heads,
# just the history of its first-parent for others that will
# be rebasing on top of it
git rev-list --parents -1 $rev | cut -d' ' -s -f2 > "$DROPPED"/$rev
short=$(git rev-list -1 --abbrev-commit --abbrev=7 $rev)
grep -v "^[a-z][a-z]* $short" <"$TODO" > "${TODO}2" ; mv "${TODO}2" "$TODO"
rm "$REWRITTEN"/$rev
fi
done
fi

test -s "$TODO" || echo noop >> "$TODO"
cat >> "$TODO" << EOF

# Rebase $SHORTREVISIONS onto $SHORTONTO
#
# Commands:
# p, pick = use commit
# e, edit = use commit, but stop for amending
# s, squash = use commit, but meld into previous commit
#
# If you remove a line here THAT COMMIT WILL BE LOST.
# However, if you remove everything, the rebase will be aborted.
#
EOF

has_action "$TODO" ||
die_abort "Nothing to do"

cp "$TODO" "$TODO".backup
git_editor "$TODO" ||
die "Could not execute editor"

has_action "$TODO" ||
die_abort "Nothing to do"

git update-ref ORIG_HEAD $HEAD
output git checkout $ONTO && do_rest
;;
esac
shift
done
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