branch: fix segfault when resolving an invalid HEAD

diff --git a/Documentation/git-checkout.txt b/Documentation/git-checkout.txt
index 1ae77be45055418b9c784d15db520841dd7bdd7a..918d8ee720a573f91ec6efa654da5c2cdc05d7b0 100644 (file)
--- a/Documentation/git-checkout.txt
+++ b/Documentation/git-checkout.txt
@@ -8,7 +8,7 @@ git-checkout - Checkout and switch to a branch
 SYNOPSIS
 --------
 [verse]
-'git-checkout' [-q] [-f] [-b <new_branch> [-l]] [-m] [<branch>]
+'git-checkout' [-q] [-f] [[--track | --no-track] -b <new_branch> [-l]] [-m] [<branch>]
 'git-checkout' [<tree-ish>] <paths>...
 
 DESCRIPTION
@@ -18,13 +18,14 @@ 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>.  Using -b will cause <new_branch> to
-be created.
+be created; in this case you can use the --track or --no-track
+options, which will be passed to `git 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`), or a
-named commit.  In
-this case, `-f` and `-b` options are meaningless and giving
+the index file (i.e. it runs `git-checkout-index -f -u`), or
+from a named commit.  In
+this case, the `-f` and `-b` options are meaningless and giving
 either of them results in an error.  <tree-ish> argument can be
 used to specify a specific tree-ish (i.e. commit, tag or tree)
 to update the index for the given paths before updating the
@@ -37,7 +38,8 @@ OPTIONS
        Quiet, supress feedback messages.
 
 -f::
-       Force a re-read of everything.
+       Proceed even if the index or the working tree differs
+       from HEAD.  This is used to throw away local changes.
 
 -b::
        Create a new branch named <new_branch> and start it at
@@ -45,6 +47,20 @@ OPTIONS
        by gitlink:git-check-ref-format[1].  Some of these checks
        may restrict the characters allowed in a branch name.
 
+--track::
+       When -b is given and a branch is created off a remote branch,
+       set up configuration so that git-pull will automatically
+       retrieve data from the remote branch.  Set the
+       branch.autosetupmerge configuration variable to true if you
+       want git-checkout and git-branch to always behave as if
+       '--track' were given.
+
+--no-track::
+       When -b is given and a branch is created off a remote branch,
+       set up configuration so that git-pull will not retrieve data
+       from the remote branch, ignoring the branch.autosetupmerge
+       configuration variable.
+
 -l::
        Create the new branch's ref log.  This activates recording of
        all changes to made the branch ref, enabling use of date