There are two options to move the main worktree, but both have
complications, so it's not implemented yet. Anyway the options are:

 - convert the main worktree to a linked one and move it away, leave the
   git repository where it is. The repo essentially becomes bare after
   this move.

 - move the repository with the main worktree. The tricky part is make
   sure all file descriptors to the repository are closed, or it may
   fail on Windows.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 Documentation/git-worktree.txt         |  7 +++++-
 builtin/worktree.c                     | 43 ++++++++++++++++++++++++++++++++++
 contrib/completion/git-completion.bash |  2 +-
 t/t2028-worktree-move.sh               | 31 ++++++++++++++++++++++++
 4 files changed, 81 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index e257c19ebe..13105138a7 100644
--- a/Documentation/git-worktree.txt
+++ b/Documentation/git-worktree.txt
@@ -12,6 +12,7 @@ SYNOPSIS
 'git worktree add' [-f] [--detach] [--checkout] [-b <new-branch>] <path> 
[<branch>]
 'git worktree list' [--porcelain]
 'git worktree lock' [--reason <string>] <worktree>
+'git worktree move' <worktree> <new-path>
 'git worktree prune' [-n] [-v] [--expire <expire>]
 'git worktree unlock' <worktree>
 
@@ -71,6 +72,11 @@ files from being pruned automatically. This also prevents it 
from
 being moved or deleted. Optionally, specify a reason for the lock
 with `--reason`.
 
+move::
+
+Move a working tree to a new location. Note that the main working tree
+cannot be moved yet.
+
 prune::
 
 Prune working tree information in $GIT_DIR/worktrees.
@@ -252,7 +258,6 @@ performed manually, such as:
 
 - `remove` to remove a linked working tree and its administrative files (and
   warn if the working tree is dirty)
-- `mv` to move or rename a working tree and update its administrative files
 
 GIT
 ---
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 9a97e37a3f..0d8b57ceb3 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -15,6 +15,7 @@ static const char * const worktree_usage[] = {
        N_("git worktree add [<options>] <path> [<branch>]"),
        N_("git worktree list [<options>]"),
        N_("git worktree lock [<options>] <path>"),
+       N_("git worktree move <worktree> <new-path>"),
        N_("git worktree prune [<options>]"),
        N_("git worktree unlock <path>"),
        NULL
@@ -524,6 +525,46 @@ static int unlock_worktree(int ac, const char **av, const 
char *prefix)
        return ret;
 }
 
+static int move_worktree(int ac, const char **av, const char *prefix)
+{
+       struct option options[] = {
+               OPT_END()
+       };
+       struct worktree **worktrees, *wt;
+       struct strbuf dst = STRBUF_INIT;
+       const char *reason;
+
+       ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
+       if (ac != 2)
+               usage_with_options(worktree_usage, options);
+
+       strbuf_addstr(&dst, prefix_filename(prefix,
+                                           strlen(prefix),
+                                           av[1]));
+       if (file_exists(dst.buf))
+               die(_("target '%s' already exists"), av[1]);
+
+       worktrees = get_worktrees(0);
+       wt = find_worktree(worktrees, prefix, av[0]);
+       if (!wt)
+               die(_("'%s' is not a working directory"), av[0]);
+       if (is_main_worktree(wt))
+               die(_("'%s' is a main working directory"), av[0]);
+       reason = is_worktree_locked(wt);
+       if (reason) {
+               if (*reason)
+                       die(_("already locked, reason: %s"), reason);
+               die(_("already locked, no reason"));
+       }
+       if (validate_worktree(wt, 0))
+               return -1;
+
+       if (rename(wt->path, dst.buf) == -1)
+               die_errno(_("failed to move '%s' to '%s'"), wt->path, dst.buf);
+
+       return update_worktree_location(wt, dst.buf);
+}
+
 int cmd_worktree(int ac, const char **av, const char *prefix)
 {
        struct option options[] = {
@@ -546,5 +587,7 @@ int cmd_worktree(int ac, const char **av, const char 
*prefix)
                return lock_worktree(ac - 1, av + 1, prefix);
        if (!strcmp(av[1], "unlock"))
                return unlock_worktree(ac - 1, av + 1, prefix);
+       if (!strcmp(av[1], "move"))
+               return move_worktree(ac - 1, av + 1, prefix);
        usage_with_options(worktree_usage, options);
 }
diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 21016bf8df..613e03b879 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2715,7 +2715,7 @@ _git_whatchanged ()
 
 _git_worktree ()
 {
-       local subcommands="add list lock prune unlock"
+       local subcommands="add list lock move prune unlock"
        local subcommand="$(__git_find_on_cmdline "$subcommands")"
        if [ -z "$subcommand" ]; then
                __gitcomp "$subcommands"
diff --git a/t/t2028-worktree-move.sh b/t/t2028-worktree-move.sh
index 8298aaf97f..bef420a086 100755
--- a/t/t2028-worktree-move.sh
+++ b/t/t2028-worktree-move.sh
@@ -59,4 +59,35 @@ test_expect_success 'unlock worktree twice' '
        test_path_is_missing .git/worktrees/source/locked
 '
 
+test_expect_success 'move non-worktree' '
+       mkdir abc &&
+       test_must_fail git worktree move abc def
+'
+
+test_expect_success 'move locked worktree' '
+       git worktree lock source &&
+       test_must_fail git worktree move source destination &&
+       git worktree unlock source
+'
+
+test_expect_success 'move worktree' '
+       toplevel="$(pwd)" &&
+       git worktree move source destination &&
+       test_path_is_missing source &&
+       git worktree list --porcelain | grep "^worktree" >actual &&
+       cat <<-EOF >expected &&
+       worktree $toplevel
+       worktree $toplevel/destination
+       worktree $toplevel/elsewhere
+       EOF
+       test_cmp expected actual &&
+       git -C destination log --format=%s >actual2 &&
+       echo init >expected2 &&
+       test_cmp expected2 actual2
+'
+
+test_expect_success 'move main worktree' '
+       test_must_fail git worktree move . def
+'
+
 test_done
-- 
2.11.0.157.gd943d85

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