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Merge branch 'tr/rebase-root'

* tr/rebase-root:
  rebase: update documentation for --root
  rebase -i: learn to rebase root commit
  rebase: learn to rebase root commit
  rebase -i: execute hook only after argument checking
This commit is contained in:
Junio C Hamano 2009-01-17 23:06:38 -08:00
commit 90abc19b5a
4 changed files with 322 additions and 52 deletions

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@ -8,10 +8,11 @@ git-rebase - Forward-port local commits to the updated upstream head
SYNOPSIS
--------
[verse]
'git rebase' [-i | --interactive] [-v | --verbose] [-m | --merge]
[-s <strategy> | --strategy=<strategy>] [--no-verify]
[-C<n>] [ --whitespace=<option>] [-p | --preserve-merges]
[--onto <newbase>] <upstream> [<branch>]
'git rebase' [-i | --interactive] [options] [--onto <newbase>]
<upstream> [<branch>]
'git rebase' [-i | --interactive] [options] --onto <newbase>
--root [<branch>]
'git rebase' --continue | --skip | --abort
DESCRIPTION
@ -22,7 +23,8 @@ it remains on the current branch.
All changes made by commits in the current branch but that are not
in <upstream> are saved to a temporary area. This is the same set
of commits that would be shown by `git log <upstream>..HEAD`.
of commits that would be shown by `git log <upstream>..HEAD` (or
`git log HEAD`, if --root is specified).
The current branch is reset to <upstream>, or <newbase> if the
--onto option was supplied. This has the exact same effect as
@ -255,6 +257,15 @@ OPTIONS
--preserve-merges::
Instead of ignoring merges, try to recreate them.
--root::
Rebase all commits reachable from <branch>, instead of
limiting them with an <upstream>. This allows you to rebase
the root commit(s) on a branch. Must be used with --onto, and
will skip changes already contained in <newbase> (instead of
<upstream>). When used together with --preserve-merges, 'all'
root commits will be rewritten to have <newbase> as parent
instead.
include::merge-strategies.txt[]
NOTES

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@ -27,6 +27,7 @@ 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
@ -44,6 +45,7 @@ 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
@ -154,6 +156,11 @@ pick_one () {
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)
@ -197,7 +204,11 @@ pick_one_preserving_merges () {
# rewrite parents; if none were rewritten, we can fast-forward.
new_parents=
pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)"
pend=" $(git rev-list --parents -1 $sha1 | cut -d' ' -s -f2-)"
if test "$pend" = " "
then
pend=" root"
fi
while [ "$pend" != "" ]
do
p=$(expr "$pend" : ' \([^ ]*\)')
@ -227,7 +238,9 @@ pick_one_preserving_merges () {
if test -f "$DROPPED"/$p
then
fast_forward=f
pend=" $(cat "$DROPPED"/$p)$pend"
replacement="$(cat "$DROPPED"/$p)"
test -z "$replacement" && replacement=root
pend=" $replacement$pend"
else
new_parents="$new_parents $p"
fi
@ -443,6 +456,7 @@ get_saved_options () {
test -d "$REWRITTEN" && PRESERVE_MERGES=t
test -f "$DOTEST"/strategy && STRATEGY="$(cat "$DOTEST"/strategy)"
test -f "$DOTEST"/verbose && VERBOSE=t
test ! -s "$DOTEST"/upstream && REBASE_ROOT=t
}
while test $# != 0
@ -547,6 +561,9 @@ first and then run 'git rebase --continue' again."
-i)
# yeah, we know
;;
--root)
REBASE_ROOT=t
;;
--onto)
shift
ONTO=$(git rev-parse --verify "$1") ||
@ -554,27 +571,36 @@ first and then run 'git rebase --continue' again."
;;
--)
shift
run_pre_rebase_hook ${1+"$@"}
test $# -eq 1 -o $# -eq 2 || usage
test ! -z "$REBASE_ROOT" -o $# -eq 1 -o $# -eq 2 || usage
test -d "$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=$UPSTREAM
shift
else
UPSTREAM_ARG=--root
test -z "$ONTO" &&
die "You must specify --onto when using --root"
fi
run_pre_rebase_hook "$UPSTREAM_ARG" "$@"
comment_for_reflog start
require_clean_work_tree
UPSTREAM=$(git rev-parse --verify "$1") || die "Invalid base"
test -z "$ONTO" && ONTO=$UPSTREAM
if test ! -z "$2"
if test ! -z "$1"
then
output git show-ref --verify --quiet "refs/heads/$2" ||
die "Invalid branchname: $2"
output git checkout "$2" ||
die "Could not checkout $2"
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?"
@ -598,12 +624,19 @@ first and then run 'git rebase --continue' again."
# This ensures that commits on merged, but otherwise
# unrelated side branches are left alone. (Think "X"
# in the man page's example.)
mkdir "$REWRITTEN" &&
for c in $(git merge-base --all $HEAD $UPSTREAM)
do
echo $ONTO > "$REWRITTEN"/$c ||
if test -z "$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"
done
fi
# No cherry-pick because our first pass is to determine
# parents to rewrite and skipping dropped commits would
# prematurely end our probe
@ -613,12 +646,21 @@ first and then run 'git rebase --continue' again."
MERGES_OPTION="--no-merges --cherry-pick"
fi
SHORTUPSTREAM=$(git rev-parse --short $UPSTREAM)
SHORTHEAD=$(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 \
$UPSTREAM...$HEAD | \
$REVISIONS | \
sed -n "s/^>//p" | while read shortsha1 rest
do
if test t != "$PRESERVE_MERGES"
@ -626,14 +668,19 @@ first and then run 'git rebase --continue' again."
echo "pick $shortsha1 $rest" >> "$TODO"
else
sha1=$(git rev-parse $shortsha1)
preserve=t
for p in $(git rev-list --parents -1 $sha1 | cut -d' ' -f2-)
do
if test -f "$REWRITTEN"/$p -a \( $p != $UPSTREAM -o $sha1 = $first_after_upstream \)
then
preserve=f
fi
done
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"/$sha1
@ -647,11 +694,11 @@ first and then run 'git rebase --continue' again."
then
mkdir "$DROPPED"
# Save all non-cherry-picked changes
git rev-list $UPSTREAM...$HEAD --left-right --cherry-pick | \
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 $UPSTREAM..$HEAD |
git rev-list $REVISIONS |
while read rev
do
if test -f "$REWRITTEN"/$rev -a "$(grep "$rev" "$DOTEST"/not-cherry-picks)" = ""
@ -660,17 +707,18 @@ first and then run 'git rebase --continue' again."
# 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 $rev | cut -d' ' -f2 > "$DROPPED"/$rev
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 $SHORTUPSTREAM..$SHORTHEAD onto $SHORTONTO
# Rebase $SHORTREVISIONS onto $SHORTONTO
#
# Commands:
# p, pick = use commit

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@ -3,7 +3,7 @@
# Copyright (c) 2005 Junio C Hamano.
#
USAGE='[--interactive | -i] [-v] [--onto <newbase>] <upstream> [<branch>]'
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>
@ -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 ${1+"$@"}
# $head_name -- refs/heads/<that-branch> or "detached HEAD"
switch_to=
case "$#" 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"

187
t/t3412-rebase-root.sh Executable file
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@ -0,0 +1,187 @@
#!/bin/sh
test_description='git rebase --root
Tests if git rebase --root --onto <newparent> 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 <<EOF &&
#!$SHELL_PATH
echo "\$1,\$2" >.git/PRE-REBASE-INPUT
EOF
chmod +x .git/hooks/pre-rebase
'
cat > expect <<EOF
4
3
2
1
EOF
test_expect_success 'rebase --root --onto <newbase>' '
git checkout -b work &&
git rebase --root --onto master &&
git log --pretty=tformat:"%s" > rebased &&
test_cmp expect rebased
'
test_expect_success 'pre-rebase got correct input (1)' '
test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
'
test_expect_success 'rebase --root --onto <newbase> <branch>' '
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$(cat .git/PRE-REBASE-INPUT)" = z--root,work2
'
test_expect_success 'rebase -i --root --onto <newbase>' '
git checkout -b work3 other &&
GIT_EDITOR=: git rebase -i --root --onto master &&
git log --pretty=tformat:"%s" > rebased3 &&
test_cmp expect rebased3
'
test_expect_success 'pre-rebase got correct input (3)' '
test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
'
test_expect_success 'rebase -i --root --onto <newbase> <branch>' '
git branch work4 other &&
GIT_EDITOR=: git rebase -i --root --onto master work4 &&
git log --pretty=tformat:"%s" > rebased4 &&
test_cmp expect rebased4
'
test_expect_success 'pre-rebase got correct input (4)' '
test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,work4
'
test_expect_success 'rebase -i -p with linear history' '
git checkout -b work5 other &&
GIT_EDITOR=: git rebase -i -p --root --onto master &&
git log --pretty=tformat:"%s" > rebased5 &&
test_cmp expect rebased5
'
test_expect_success 'pre-rebase got correct input (5)' '
test "z$(cat .git/PRE-REBASE-INPUT)" = z--root,
'
test_expect_success 'set up merge history' '
git checkout other^ &&
git checkout -b side &&
echo 5 > C &&
git add C &&
git commit -m 5 &&
git checkout other &&
git merge side
'
sed 's/#/ /g' > expect-side <<'EOF'
* Merge branch 'side' into other
|\##
| * 5
* | 4
|/##
* 3
* 2
* 1
EOF
test_expect_success 'rebase -i -p with merge' '
git checkout -b work6 other &&
GIT_EDITOR=: git rebase -i -p --root --onto master &&
git log --graph --topo-order --pretty=tformat:"%s" > rebased6 &&
test_cmp expect-side rebased6
'
test_expect_success 'set up second root and merge' '
git symbolic-ref HEAD refs/heads/third &&
rm .git/index &&
rm A B C &&
echo 6 > D &&
git add D &&
git commit -m 6 &&
git checkout other &&
git merge third
'
sed 's/#/ /g' > expect-third <<'EOF'
* Merge branch 'third' into other
|\##
| * 6
* | Merge branch 'side' into other
|\ \##
| * | 5
* | | 4
|/ /##
* | 3
|/##
* 2
* 1
EOF
test_expect_success 'rebase -i -p with two roots' '
git checkout -b work7 other &&
GIT_EDITOR=: git rebase -i -p --root --onto master &&
git log --graph --topo-order --pretty=tformat:"%s" > rebased7 &&
test_cmp expect-third rebased7
'
test_expect_success 'setup pre-rebase hook that fails' '
mkdir -p .git/hooks &&
cat >.git/hooks/pre-rebase <<EOF &&
#!$SHELL_PATH
false
EOF
chmod +x .git/hooks/pre-rebase
'
test_expect_success 'pre-rebase hook stops rebase' '
git checkout -b stops1 other &&
GIT_EDITOR=: test_must_fail git rebase --root --onto master &&
test "z$(git symbolic-ref HEAD)" = zrefs/heads/stops1
test 0 = $(git rev-list other...stops1 | wc -l)
'
test_expect_success 'pre-rebase hook stops rebase -i' '
git checkout -b stops2 other &&
GIT_EDITOR=: test_must_fail git rebase --root --onto master &&
test "z$(git symbolic-ref HEAD)" = zrefs/heads/stops2
test 0 = $(git rev-list other...stops2 | wc -l)
'
test_done