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checkout: allow detaching to HEAD even when switching to the tip of a branch

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You cannot currently checkout the tip of an existing branch
without moving to the branch.

This allows you to detach your HEAD and place it at such a
commit, with:

    $ git checkout master^0

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2007-03-29 01:02:50 -07:00
parent cbb84e5d17
commit fdc99cbbdc
2 changed files with 64 additions and 3 deletions
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4
git-checkout.sh
View File

@ -170,7 +170,7 @@ describe_detached_head () {
}
}
if test -z "$branch$newbranch" && test "$new" != "$old"
if test -z "$branch$newbranch" && test "$new_name" != "$old_name"
then
detached="$new"
if test -n "$oldbranch" && test -z "$quiet"
@ -180,7 +180,7 @@ If you want to create a new branch from this checkout, you may do so
(now or later) by using -b with the checkout command again. Example:
git checkout -b <new_branch_name>"
fi
elif test -z "$oldbranch"
elif test -z "$oldbranch" && test "$new" != "$old"
then
describe_detached_head 'Previous HEAD position was' "$old"
fi

63
t/t7201-co.sh
View File

@ -3,7 +3,20 @@
# Copyright (c) 2006 Junio C Hamano
#
test_description='git-checkout tests.'
test_description='git-checkout tests.
Creates master, forks renamer and side branches from it.
Test switching across them.
! [master] Initial A one, A two
* [renamer] Renamer R one->uno, M two
! [side] Side M one, D two, A three
---
+ [side] Side M one, D two, A three
* [renamer] Renamer R one->uno, M two
+*+ [master] Initial A one, A two
'
. ./test-lib.sh
@ -129,4 +142,52 @@ test_expect_success 'checkout -m with merge conflict' '
! test -s current
'
test_expect_success 'checkout to detach HEAD' '
git checkout -f renamer && git clean &&
git checkout renamer^ &&
H=$(git rev-parse --verify HEAD) &&
M=$(git show-ref -s --verify refs/heads/master) &&
test "z$H" = "z$M" &&
if git symbolic-ref HEAD >/dev/null 2>&1
then
echo "OOPS, HEAD is still symbolic???"
false
else
: happy
fi
'
test_expect_success 'checkout to detach HEAD with branchname^' '
git checkout -f master && git clean &&
git checkout renamer^ &&
H=$(git rev-parse --verify HEAD) &&
M=$(git show-ref -s --verify refs/heads/master) &&
test "z$H" = "z$M" &&
if git symbolic-ref HEAD >/dev/null 2>&1
then
echo "OOPS, HEAD is still symbolic???"
false
else
: happy
fi
'
test_expect_success 'checkout to detach HEAD with HEAD^0' '
git checkout -f master && git clean &&
git checkout HEAD^0 &&
H=$(git rev-parse --verify HEAD) &&
M=$(git show-ref -s --verify refs/heads/master) &&
test "z$H" = "z$M" &&
if git symbolic-ref HEAD >/dev/null 2>&1
then
echo "OOPS, HEAD is still symbolic???"
false
else
: happy
fi
'
test_done