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-rw-r--r--Documentation/git-checkout.txt42
-rwxr-xr-xgit-checkout.sh79
2 files changed, 103 insertions, 18 deletions
diff --git a/Documentation/git-checkout.txt b/Documentation/git-checkout.txt
index f753c14..b7bb1b4 100644
--- a/Documentation/git-checkout.txt
+++ b/Documentation/git-checkout.txt
@@ -7,12 +7,24 @@ git-checkout - Checkout and switch to a branch.
SYNOPSIS
--------
-'git-checkout' [-f] [-b <new_branch>] [<branch>]
+'git-checkout' [-f] [-b <new_branch>] [<branch>] [<paths>...]
DESCRIPTION
-----------
-Updates the index and working tree to reflect the specified branch,
-<branch>. Updates HEAD to be <branch> or, if specified, <new_branch>.
+
+When <paths> are not given, this command switches branches, by
+updating the index and working tree to reflect the specified
+branch, <branch>, and updating HEAD to be <branch> or, if
+specified, <new_branch>.
+
+When <paths> are given, this command does *not* switch
+branches. It updates the named paths in the working tree from
+the index file (i.e. it runs `git-checkout-index -f -u`). In
+this case, `-f` and `-b` options are meaningless and giving
+either of them results in an error. <branch> argument can be
+used to specify a specific tree-ish to update the index for the
+given paths before updating the working tree.
+
OPTIONS
-------
@@ -29,6 +41,30 @@ OPTIONS
Branch to checkout; may be any object ID that resolves to a
commit. Defaults to HEAD.
+
+EXAMPLE
+-------
+
+The following sequence checks out the `master` branch, reverts
+the `Makefile` to two revisions back, deletes hello.c by
+mistake, and gets it back from the index.
+
+------------
+$ git checkout master
+$ git checkout master~2 Makefile
+$ rm -f hello.c
+$ git checkout hello.c
+------------
+
+If you have an unfortunate branch that is named `hello.c`, the
+last step above would be confused as an instruction to switch to
+that branch. You should instead write:
+
+------------
+$ git checkout -- hello.c
+------------
+
+
Author
------
Written by Linus Torvalds <torvalds@osdl.org>
diff --git a/git-checkout.sh b/git-checkout.sh
index 2c053a3..73652fa 100755
--- a/git-checkout.sh
+++ b/git-checkout.sh
@@ -23,32 +23,81 @@ while [ "$#" != "0" ]; do
"-f")
force=1
;;
+ --)
+ break
+ ;;
*)
- rev=$(git-rev-parse --verify "$arg^0" 2>/dev/null) ||
- die "I don't know any '$arg'."
- if [ -z "$rev" ]; then
- echo "unknown flag $arg"
- exit 1
- fi
- if [ "$new" ]; then
- echo "Multiple revisions?"
- exit 1
- fi
- new="$rev"
- if [ -f "$GIT_DIR/refs/heads/$arg" ]; then
- branch="$arg"
+ if rev=$(git-rev-parse --verify "$arg^0" 2>/dev/null)
+ then
+ if [ -z "$rev" ]; then
+ echo "unknown flag $arg"
+ exit 1
+ fi
+ new="$rev"
+ if [ -f "$GIT_DIR/refs/heads/$arg" ]; then
+ branch="$arg"
+ fi
+ elif rev=$(git-rev-parse --verify "$arg^{tree}" 2>/dev/null)
+ then
+ # checking out selected paths from a tree-ish.
+ new="$rev"
+ branch=
+ else
+ new=
+ branch=
+ set x "$arg" "$@"
+ shift
fi
+ break
;;
esac
done
-[ -z "$new" ] && new=$old
+# The behaviour of the command with and without explicit path
+# parameters is quite different.
+#
+# Without paths, we are checking out everything in the work tree,
+# possibly switching branches. This is the traditional behaviour.
#
+# With paths, we are _never_ switching branch, but checking out
+# the named paths from either index (when no rev is given),
+# or the named tree-ish (when rev is given).
+
+if test "$#" -ge 1
+then
+ if test '' != "$newbranch$force"
+ then
+ die "updating paths and switching branches or forcing are incompatible."
+ fi
+ if test '' != "$new"
+ then
+ # from a specific tree-ish; note that this is for
+ # rescuing paths and is never meant to remove what
+ # is not in the named tree-ish.
+ git-ls-tree -r "$new" "$@" |
+ sed -ne 's/^\([0-7]*\) blob \(.*\)$/\1 \2/p' |
+ git-update-index --index-info || exit $?
+ fi
+ git-checkout-index -f -u -- "$@"
+ exit $?
+else
+ # Make sure we did not fall back on $arg^{tree} codepath
+ # since we are not checking out from an arbitrary tree-ish,
+ # but switching branches.
+ if test '' != "$new"
+ then
+ git-rev-parse --verify "$new^{commit}" >/dev/null 2>&1 ||
+ die "Cannot switch branch to a non-commit."
+ fi
+fi
+
+[ -z "$new" ] && new=$old
+
# If we don't have an old branch that we're switching to,
# and we don't have a new branch name for the target we
# are switching to, then we'd better just be checking out
# what we already had
-#
+
[ -z "$branch$newbranch" ] &&
[ "$new" != "$old" ] &&
die "git checkout: you need to specify a new branch name"