Nguyễn Thái Ngọc Duy venit, vidit, dixit 23.07.2014 13:43:
> Give the user a choice in this case. If they want to detach, they can go
> with '--detach --to ...', or they could switch branch of the checkout
> that's holding the ref in question. Or they could just create a new
> branch with '-b xxx --to yyy'
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
> ---
> Documentation/config.txt | 3 ++
> advice.c | 2 ++
> advice.h | 1 +
> builtin/checkout.c | 73
> ++++++++++++++++++++++++++++--------------------
> t/t2025-checkout-to.sh | 16 +++++------
> 5 files changed, 56 insertions(+), 39 deletions(-)
>
> diff --git a/Documentation/config.txt b/Documentation/config.txt
> index 57999fa..4a41202 100644
> --- a/Documentation/config.txt
> +++ b/Documentation/config.txt
> @@ -201,6 +201,9 @@ advice.*::
> rmHints::
> In case of failure in the output of linkgit:git-rm[1],
> show directions on how to proceed from the current state.
> + checkoutTo::
> + In case of failure in the output of "git checkout --to",
> + show directions on how to proceed from the current state.
> --
>
> core.fileMode::
> diff --git a/advice.c b/advice.c
> index 9b42033..b1fb524 100644
> --- a/advice.c
> +++ b/advice.c
> @@ -15,6 +15,7 @@ int advice_detached_head = 1;
> int advice_set_upstream_failure = 1;
> int advice_object_name_warning = 1;
> int advice_rm_hints = 1;
> +int advice_checkout_to = 1;
>
> static struct {
> const char *name;
> @@ -35,6 +36,7 @@ static struct {
> { "setupstreamfailure", &advice_set_upstream_failure },
> { "objectnamewarning", &advice_object_name_warning },
> { "rmhints", &advice_rm_hints },
> + { "checkoutto", &advice_checkout_to },
>
> /* make this an alias for backward compatibility */
> { "pushnonfastforward", &advice_push_update_rejected }
> diff --git a/advice.h b/advice.h
> index 5ecc6c1..a288219 100644
> --- a/advice.h
> +++ b/advice.h
> @@ -18,6 +18,7 @@ extern int advice_detached_head;
> extern int advice_set_upstream_failure;
> extern int advice_object_name_warning;
> extern int advice_rm_hints;
> +extern int advice_checkout_to;
>
> int git_default_advice_config(const char *var, const char *value);
> __attribute__((format (printf, 1, 2)))
> diff --git a/builtin/checkout.c b/builtin/checkout.c
> index c83f476..d35245a 100644
> --- a/builtin/checkout.c
> +++ b/builtin/checkout.c
> @@ -1006,31 +1006,52 @@ static const char *unique_tracking_name(const char
> *name, unsigned char *sha1)
> return NULL;
> }
>
> -static int check_linked_checkout(struct branch_info *new,
> - const char *name, const char *path)
> +static void check_linked_checkout(struct branch_info *new, const char *id)
> {
> struct strbuf sb = STRBUF_INIT;
> + struct strbuf path = STRBUF_INIT;
> + struct strbuf gitdir = STRBUF_INIT;
> const char *start, *end;
> - if (strbuf_read_file(&sb, path, 0) < 0 ||
> - !skip_prefix(sb.buf, "ref:", &start)) {
> - strbuf_release(&sb);
> - return 0;
> - }
>
> + if (id)
> + strbuf_addf(&path, "%s/repos/%s/HEAD", get_git_common_dir(),
> id);
> + else
> + strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
> +
> + if (strbuf_read_file(&sb, path.buf, 0) <= 0 ||
> + !skip_prefix(sb.buf, "ref:", &start))
> + goto done;
> while (isspace(*start))
> start++;
> end = start;
> while (*end && !isspace(*end))
> end++;
> - if (!strncmp(start, new->path, end - start) &&
> - new->path[end - start] == '\0') {
> - strbuf_release(&sb);
> - new->path = NULL; /* detach */
> - new->checkout = xstrdup(name); /* reason */
> - return 1;
> - }
> + if (strncmp(start, new->path, end - start) ||
> + new->path[end - start] != '\0')
> + goto done;
> + if (id) {
> + strbuf_reset(&path);
> + strbuf_addf(&path, "%s/repos/%s/gitdir",
> + get_git_common_dir(), id);
> + if (strbuf_read_file(&gitdir, path.buf, 0) <= 0)
> + goto done;
> + while (gitdir.len && (gitdir.buf[gitdir.len - 1] == '\n' ||
> + gitdir.buf[gitdir.len - 1] == '\r'))
> + gitdir.buf[--gitdir.len] = '\0';
> + } else
> + strbuf_addstr(&gitdir, get_git_common_dir());
> + if (advice_checkout_to)
> + die(_("%s is already checked out at %s.\n"
> + "Either use --detach or -b together with --to "
> + "or switch branch in the the other checkout."),
"or switch to a different branch in the other checkout". But maybe we
can be even more helpful, like:
"%s is already checked out at %s.\n"
"Either checkout the detached head of branch %s using\n"
" git checkout --detach --to %s %s\n"
"or checkout a new branch based off %s using\n"
" git checkout --to %s -b %s newbranch %s\n"
"or switch to a different branch in the other checkout."
if we can figure out the appropriate arguments at this point in the code.
> + new->path, gitdir.buf);
> + else
> + die(_("%s is already checked out at %s."),
> + new->path, gitdir.buf);
> +done:
> + strbuf_release(&path);
> strbuf_release(&sb);
> - return 0;
> + strbuf_release(&gitdir);
> }
>
> static void check_linked_checkouts(struct branch_info *new)
> @@ -1045,27 +1066,17 @@ static void check_linked_checkouts(struct branch_info
> *new)
> return;
> }
>
> - strbuf_reset(&path);
> - strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
> /*
> * $GIT_COMMON_DIR/HEAD is practically outside
> * $GIT_DIR so resolve_ref_unsafe() won't work (it
> * uses git_path). Parse the ref ourselves.
> */
> - if (check_linked_checkout(new, "", path.buf)) {
> - strbuf_release(&path);
> - closedir(dir);
> - return;
> - }
> + check_linked_checkout(new, NULL);
>
> while ((d = readdir(dir)) != NULL) {
> if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
> continue;
> - strbuf_reset(&path);
> - strbuf_addf(&path, "%s/repos/%s/HEAD",
> - get_git_common_dir(), d->d_name);
> - if (check_linked_checkout(new, d->d_name, path.buf))
> - break;
> + check_linked_checkout(new, d->d_name);
> }
> strbuf_release(&path);
> closedir(dir);
> @@ -1076,7 +1087,8 @@ static int parse_branchname_arg(int argc, const char
> **argv,
> struct branch_info *new,
> struct tree **source_tree,
> unsigned char rev[20],
> - const char **new_branch)
> + const char **new_branch,
> + int force_detach)
> {
> int argcount = 0;
> unsigned char branch_rev[20];
> @@ -1198,7 +1210,7 @@ static int parse_branchname_arg(int argc, const char
> **argv,
> else
> new->path = NULL; /* not an existing branch */
>
> - if (new->path) {
> + if (new->path && !force_detach && !*new_branch) {
> unsigned char sha1[20];
> int flag;
> char *head_ref = resolve_refdup("HEAD", sha1, 0, &flag);
> @@ -1416,7 +1428,8 @@ int cmd_checkout(int argc, const char **argv, const
> char *prefix)
> !opts.new_branch;
> int n = parse_branchname_arg(argc, argv, dwim_ok,
> &new, &opts.source_tree,
> - rev, &opts.new_branch);
> + rev, &opts.new_branch,
> + opts.force_detach);
> argv += n;
> argc -= n;
> }
> diff --git a/t/t2025-checkout-to.sh b/t/t2025-checkout-to.sh
> index b0d97a0..c6601a4 100755
> --- a/t/t2025-checkout-to.sh
> +++ b/t/t2025-checkout-to.sh
> @@ -14,7 +14,7 @@ test_expect_success 'checkout --to not updating paths' '
>
> test_expect_success 'checkout --to a new worktree' '
> git rev-parse HEAD >expect &&
> - git checkout --to here master &&
> + git checkout --detach --to here master &&
> (
> cd here &&
> test_cmp ../init.t init.t &&
> @@ -28,7 +28,7 @@ test_expect_success 'checkout --to a new worktree' '
> test_expect_success 'checkout --to from a linked checkout' '
> (
> cd here &&
> - git checkout --to nested-here master
> + git checkout --detach --to nested-here master
> cd nested-here &&
> git fsck
> )
> @@ -46,19 +46,17 @@ test_expect_success 'checkout --to a new worktree
> creating new branch' '
> )
> '
>
> -test_expect_success 'detach if the same branch is already checked out' '
> +test_expect_success 'die the same branch is already checked out' '
> (
> cd here &&
> - git checkout newmaster &&
> - test_must_fail git symbolic-ref HEAD
> + test_must_fail git checkout newmaster
> )
> '
>
> -test_expect_success 'not detach on re-checking out current branch' '
> +test_expect_success 'not die on re-checking out current branch' '
> (
> cd there &&
> - git checkout newmaster &&
> - git symbolic-ref HEAD
> + git checkout newmaster
> )
> '
>
> @@ -66,7 +64,7 @@ test_expect_success 'checkout --to from a bare repo' '
> (
> git clone --bare . bare &&
> cd bare &&
> - git checkout --to ../there2 master
> + git checkout --to ../there2 -b bare-master master
> )
> '
>
>
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