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