Junio C Hamano <gitster@xxxxxxxxx> writes:
>> And thinking about the names again, I have a feeling that
>> updateInstead and mergeInstead are both probably misnomer.
>
> Let me take this part back. After all, I do not think I would
> design the mechanism to implement an alternative logic that decides
> when it is safe to allow the update of the ref and to reflect the
> changes to the working tree, and that actually does the checkout to
> the working tree by using a new value like mergeInstead. So we
> would only need a single name, and updateInstead is not too bad.
> ...
> The mechanism I would employ when doing an alternative logic,
> possibly looser one but does not necessarily so, would be to have a
> hook script "push-to-checkout". When denyCurrentBranch is set to
> updateInstead, if there is no such hook, the "working tree has to be
> absolutely clean and we would do a 'read-tree -m -u $old $new'
> (which is the same as 'reset --hard $new' under the precondition)"
> you implemented will be used as the "logic that decides when it is
> safe, and that does the checkout to the working tree". When the
> "push-to-checkout" hook exists, however, we just invoke that hook
> with $new as argument, and it can decide when it is safe in whatever
> way it chooses to, and it can checkout the $new to the working tree
> in whatever way it wants.
So here comes a two-patch series on top of your series (with the
test update I sent earlier). As I never do "push to deploy" that
requires no changes to the working tree or to the index, while I
have seem myself in a situation where I have to emulate a "git pull"
with a "git push" in the opposite direction (and work it around if
the target of the 'git pull' I wanted to do were the current branch,
by first pushing into a throw-away branch, because of denyCurrent),
I could imagine myself using this variant. Having said that, this
is primarily so that I do not want to forget and discard the brain
cycles we spent discussing this to the waste, more than that I
cannot wait to use this feature myself ;-)
The first one here is a pure refactoring. The second one is the
real fun.
-- >8 --
Subject: [PATCH 1/2] receive-pack: refactor updateInstead codepath
Keep the "there is nothing to update in a bare repository", "when
the check and update process runs, here are the GIT_DIR and
GIT_WORK_TREE" logic, which will be common regardless of how the
decision to update and the actual update are done, in the original
update_worktree() function, and split out the "working tree and
the index must match the original HEAD exactly" and "use two-way
read-tree to update the working tree" into a new push_to_deploy()
helper function. This will allow customizing the logic more cleanly
and easily.
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
builtin/receive-pack.c | 53 ++++++++++++++++++++++++++------------------------
1 file changed, 28 insertions(+), 25 deletions(-)
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index c047418..11800cd 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -733,7 +733,9 @@ static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
return 0;
}
-static const char *update_worktree(unsigned char *sha1)
+static const char *push_to_deploy(unsigned char *sha1,
+ struct argv_array *env,
+ const char *work_tree)
{
const char *update_refresh[] = {
"update-index", "-q", "--ignore-submodules", "--refresh", NULL
@@ -748,69 +750,70 @@ static const char *update_worktree(unsigned char *sha1)
const char *read_tree[] = {
"read-tree", "-u", "-m", NULL, NULL
};
- const char *work_tree = git_work_tree_cfg ? git_work_tree_cfg : "..";
- struct argv_array env = ARGV_ARRAY_INIT;
struct child_process child = CHILD_PROCESS_INIT;
- if (is_bare_repository())
- return "denyCurrentBranch = updateInstead needs a worktree";
-
- argv_array_pushf(&env, "GIT_DIR=%s", absolute_path(get_git_dir()));
-
child.argv = update_refresh;
- child.env = env.argv;
+ child.env = env->argv;
child.dir = work_tree;
child.no_stdin = 1;
child.stdout_to_stderr = 1;
child.git_cmd = 1;
- if (run_command(&child)) {
- argv_array_clear(&env);
+ if (run_command(&child))
return "Up-to-date check failed";
- }
/* run_command() does not clean up completely; reinitialize */
child_process_init(&child);
child.argv = diff_files;
- child.env = env.argv;
+ child.env = env->argv;
child.dir = work_tree;
child.no_stdin = 1;
child.stdout_to_stderr = 1;
child.git_cmd = 1;
- if (run_command(&child)) {
- argv_array_clear(&env);
+ if (run_command(&child))
return "Working directory has unstaged changes";
- }
child_process_init(&child);
child.argv = diff_index;
- child.env = env.argv;
+ child.env = env->argv;
child.no_stdin = 1;
child.no_stdout = 1;
child.stdout_to_stderr = 0;
child.git_cmd = 1;
- if (run_command(&child)) {
- argv_array_clear(&env);
+ if (run_command(&child))
return "Working directory has staged changes";
- }
read_tree[3] = sha1_to_hex(sha1);
child_process_init(&child);
child.argv = read_tree;
- child.env = env.argv;
+ child.env = env->argv;
child.dir = work_tree;
child.no_stdin = 1;
child.no_stdout = 1;
child.stdout_to_stderr = 0;
child.git_cmd = 1;
- if (run_command(&child)) {
- argv_array_clear(&env);
+ if (run_command(&child))
return "Could not update working tree to new HEAD";
- }
- argv_array_clear(&env);
return NULL;
}
+static const char *update_worktree(unsigned char *sha1)
+{
+ const char *retval;
+ const char *work_tree = git_work_tree_cfg ? git_work_tree_cfg : "..";
+ struct argv_array env = ARGV_ARRAY_INIT;
+
+ if (is_bare_repository())
+ return "denyCurrentBranch = updateInstead needs a worktree";
+
+ argv_array_pushf(&env, "GIT_DIR=%s", absolute_path(get_git_dir()));
+
+ retval = push_to_deploy(sha1, &env, work_tree);
+
+ argv_array_clear(&env);
+ return retval;
+}
+
static const char *update(struct command *cmd, struct shallow_info *si)
{
const char *name = cmd->ref_name;
--
2.2.0-141-gd3f4719
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