The caller of add_worktree() provides it with a command to invoke to
populate the new worktree. This was a useful abstraction during the
conversion of "git checkout --to" functionality to "git worktree add"
since git-checkout and git-worktree constructed the population command
differently. However, now that "git checkout --to" has been retired, and
add_worktree() has access to the options given to "worktree add", this
extra indirection is no longer useful, and makes the code a bit more
convoluted than it needs to be.

Moreover, the eventual goal is for git-worktree to populate the new
worktree via "git reset --hard" rather than "git checkout", and to do
so, it may need to invoke other commands in addition to the
worktree-population command, so it will be doing command construction
itself anyhow. Therefore, relocate construction of the
worktree-population command from add() to add_worktree().

Signed-off-by: Eric Sunshine <sunsh...@sunshineco.com>
---
 builtin/worktree.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/builtin/worktree.c b/builtin/worktree.c
index 9be1c74..e04a6d1 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -178,7 +178,7 @@ static const char *worktree_basename(const char *path, int 
*olen)
        return name;
 }
 
-static int add_worktree(const char *path, const char **child_argv,
+static int add_worktree(const char *path, const char *refname,
                        const struct add_opts *opts)
 {
        struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
@@ -260,7 +260,12 @@ static int add_worktree(const char *path, const char 
**child_argv,
        setenv(GIT_WORK_TREE_ENVIRONMENT, path, 1);
        memset(&cp, 0, sizeof(cp));
        cp.git_cmd = 1;
-       cp.argv = child_argv;
+       argv_array_push(&cp.args, "checkout");
+       if (opts->force)
+               argv_array_push(&cp.args, "--ignore-other-worktrees");
+       if (opts->detach)
+               argv_array_push(&cp.args, "--detach");
+       argv_array_push(&cp.args, refname);
        ret = run_command(&cp);
        if (!ret) {
                is_junk = 0;
@@ -283,7 +288,6 @@ static int add(int ac, const char **av, const char *prefix)
        struct add_opts opts;
        const char *new_branch_force = NULL;
        const char *path, *branch;
-       struct argv_array cmd = ARGV_ARRAY_INIT;
        struct option options[] = {
                OPT__FORCE(&opts.force, N_("checkout <branch> even if already 
checked out in other worktree")),
                OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
@@ -328,14 +332,7 @@ static int add(int ac, const char **av, const char *prefix)
                branch = opts.new_branch;
        }
 
-       argv_array_push(&cmd, "checkout");
-       if (opts.force)
-               argv_array_push(&cmd, "--ignore-other-worktrees");
-       if (opts.detach)
-               argv_array_push(&cmd, "--detach");
-       argv_array_push(&cmd, branch);
-
-       return add_worktree(path, cmd.argv, &opts);
+       return add_worktree(path, branch, &opts);
 }
 
 int cmd_worktree(int ac, const char **av, const char *prefix)
-- 
2.5.0.rc1.201.ga12d9f8

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