From 190f53232d1e92a57843df90e889bcfea39620d3 Mon Sep 17 00:00:00 2001 From: Thomas Rast Date: Mon, 5 Jan 2009 18:35:16 +0100 Subject: [PATCH] rebase: learn to rebase root commit Teach git-rebase a new option --root, which instructs it to rebase the entire history leading up to . This option must be used with --onto , and causes commits that already exist in to be skipped. (Normal operation skips commits that already exist in instead.) One possible use-case is with git-svn: suppose you start hacking (perhaps offline) on a new project, but later notice you want to commit this work to SVN. You will have to rebase the entire history, including the root commit, on a (possibly empty) commit coming from git-svn, to establish a history connection. This previously had to be done by cherry-picking the root commit manually. Signed-off-by: Thomas Rast Signed-off-by: Junio C Hamano --- git-rebase.sh | 56 +++++++++++++++++++-------- t/t3412-rebase-root.sh | 86 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 126 insertions(+), 16 deletions(-) create mode 100755 t/t3412-rebase-root.sh diff --git a/git-rebase.sh b/git-rebase.sh index ebd4df3a0..6d3eddbad 100755 --- a/git-rebase.sh +++ b/git-rebase.sh @@ -3,7 +3,7 @@ # Copyright (c) 2005 Junio C Hamano. # -USAGE='[--interactive | -i] [-v] [--onto ] []' +USAGE='[--interactive | -i] [-v] [--onto ] [|--root] []' LONG_USAGE='git-rebase replaces with a new branch of the same name. When the --onto option is provided the new branch starts out with a HEAD equal to , otherwise it is equal to @@ -47,6 +47,7 @@ dotest="$GIT_DIR"/rebase-merge prec=4 verbose= git_am_opt= +rebase_root= continue_merge () { test -n "$prev_head" || die "prev_head must be defined" @@ -297,6 +298,9 @@ do -C*) git_am_opt="$git_am_opt $1" ;; + --root) + rebase_root=t + ;; -*) usage ;; @@ -344,17 +348,29 @@ case "$diff" in ;; esac -# The upstream head must be given. Make sure it is valid. -upstream_name="$1" -upstream=`git rev-parse --verify "${upstream_name}^0"` || - die "invalid upstream $upstream_name" +if test -z "$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 ${1+"$@"} +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) @@ -362,16 +378,16 @@ run_pre_rebase_hook ${1+"$@"} # $head_name -- refs/heads/ or "detached HEAD" switch_to= case "$#" in -2) +1) # Is it "rebase other $branchname" or "rebase other $commit"? - branch_name="$2" - switch_to="$2" + branch_name="$1" + switch_to="$1" - if git show-ref --verify --quiet -- "refs/heads/$2" && - branch=$(git rev-parse -q --verify "refs/heads/$2") + if git show-ref --verify --quiet -- "refs/heads/$1" && + branch=$(git rev-parse -q --verify "refs/heads/$1") then - head_name="refs/heads/$2" - elif branch=$(git rev-parse -q --verify "$2") + head_name="refs/heads/$1" + elif branch=$(git rev-parse -q --verify "$1") then head_name="detached HEAD" else @@ -393,7 +409,8 @@ case "$#" in esac orig_head=$branch -# Now we are rebasing commits $upstream..$branch on top of $onto +# 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 $onto with linear history, # but this should be done only when upstream and onto are the same. @@ -429,10 +446,17 @@ then exit 0 fi +if test -n "$rebase_root" +then + revisions="$onto..$orig_head" +else + revisions="$upstream..$orig_head" +fi + if test -z "$do_merge" then git format-patch -k --stdout --full-index --ignore-if-in-upstream \ - "$upstream..$orig_head" | + $root_flag "$revisions" | git am $git_am_opt --rebasing --resolvemsg="$RESOLVEMSG" && move_to_original_branch ret=$? @@ -455,7 +479,7 @@ echo "$orig_head" > "$dotest/orig-head" echo "$head_name" > "$dotest/head-name" msgnum=0 -for cmt in `git rev-list --reverse --no-merges "$upstream..$orig_head"` +for cmt in `git rev-list --reverse --no-merges "$revisions"` do msgnum=$(($msgnum + 1)) echo "$cmt" > "$dotest/cmt.$msgnum" diff --git a/t/t3412-rebase-root.sh b/t/t3412-rebase-root.sh new file mode 100755 index 000000000..dd919100d --- /dev/null +++ b/t/t3412-rebase-root.sh @@ -0,0 +1,86 @@ +#!/bin/sh + +test_description='git rebase --root + +Tests if git rebase --root --onto can rebase the root commit. +' +. ./test-lib.sh + +test_expect_success 'prepare repository' ' + echo 1 > A && + git add A && + git commit -m 1 && + echo 2 > A && + git add A && + git commit -m 2 && + git symbolic-ref HEAD refs/heads/other && + rm .git/index && + echo 3 > B && + git add B && + git commit -m 3 && + echo 1 > A && + git add A && + git commit -m 1b && + echo 4 > B && + git add B && + git commit -m 4 +' + +test_expect_success 'rebase --root expects --onto' ' + test_must_fail git rebase --root +' + +test_expect_success 'setup pre-rebase hook' ' + mkdir -p .git/hooks && + cat >.git/hooks/pre-rebase <.git/PRE-REBASE-INPUT +EOF + chmod +x .git/hooks/pre-rebase +' +cat > expect <' ' + git checkout -b work && + git rebase --root --onto master && + git log --pretty=tformat:"%s" > rebased && + test_cmp expect rebased +' + +test_expect_success 'pre-rebase got correct input (1)' ' + test "z$(cat .git/PRE-REBASE-INPUT)" = z--root, +' + +test_expect_success 'rebase --root --onto ' ' + git branch work2 other && + git rebase --root --onto master work2 && + git log --pretty=tformat:"%s" > rebased2 && + test_cmp expect rebased2 +' + +test_expect_success 'pre-rebase got correct input (2)' ' + test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,work2 +' + +test_expect_success 'setup pre-rebase hook that fails' ' + mkdir -p .git/hooks && + cat >.git/hooks/pre-rebase <