When a submodule is initialized, the config variable 'submodule.<name>.url' is set depending on the value of the same variable in the .gitmodules file. When the URL indicates to be relative, then the url is computed relative to its default remote. The default remote cannot be determined accurately in all cases, such that it falls back to 'origin'.
The 'origin' remote may not exist, though. In that case we give up looking for a suitable remote and we'll just assume it to be a local relative path. This can be confusing to users as there is a lot of guessing involved, which is not obvious to the user. So in the corner case of assuming a local autoritative truth, warn the user to lessen the confusion. This behavior was introduced in 4d6893200 (submodule add: allow relative repository path even when no url is set, 2011-06-06), which shared the code with submodule-init and then ported to C in 3604242f080a (submodule: port init from shell to C, 2016-04-15). In case of submodule-add, this behavior makes sense in some use cases[1], however for submodule-init there does not seem to be an immediate obvious use case to fall back to a local submodule. However there might be, so warn instead of die here. While adding the warning, also clarify the behavior of relative URLs in the documentation. [1] e.g. http://stackoverflow.com/questions/8721984/git-ignore-files-for-public-repository-but-not-for-private "store a secret locally in a submodule, with no intention to publish it" Reported-by: Shawn Pearce <spea...@spearce.org> Signed-off-by: Stefan Beller <sbel...@google.com> --- Documentation/git-submodule.txt | 22 +++++++++++++++------- builtin/submodule--helper.c | 8 +++----- 2 files changed, 18 insertions(+), 12 deletions(-) diff --git a/Documentation/git-submodule.txt b/Documentation/git-submodule.txt index 8acc72ebb8..d23dee2a5b 100644 --- a/Documentation/git-submodule.txt +++ b/Documentation/git-submodule.txt @@ -73,13 +73,17 @@ configuration entries unless `--name` is used to specify a logical name. + <repository> is the URL of the new submodule's origin repository. This may be either an absolute URL, or (if it begins with ./ -or ../), the location relative to the superproject's origin +or ../), the location relative to the superproject's default remote repository (Please note that to specify a repository 'foo.git' which is located right next to a superproject 'bar.git', you'll have to use '../foo.git' instead of './foo.git' - as one might expect when following the rules for relative URLs - because the evaluation of relative URLs in Git is identical to that of relative directories). -If the superproject doesn't have an origin configured ++ +The default remote is the remote of the remote tracking branch +of the current branch. If no such remote tracking branch exists or +the in detached HEAD mode, "origin" is assumed to be the default remote. +If the superproject doesn't have a default remote configured the superproject is its own authoritative upstream and the current working directory is used instead. + @@ -118,18 +122,22 @@ too (and can also report changes to a submodule's work tree). init [--] [<path>...]:: Initialize the submodules recorded in the index (which were - added and committed elsewhere) by copying submodule - names and urls from .gitmodules to .git/config. + added and committed elsewhere) by copying `submodule.$name.url` + from .gitmodules to .git/config, resolving relative urls to be + relative to the default remote. ++ Optional <path> arguments limit which submodules will be initialized. - It will also copy the value of `submodule.$name.update` into - .git/config. - The key used in .git/config is `submodule.$name.url`. + If no path is specified all submodules are initialized. ++ + When present, it will also copy the value of `submodule.$name.update`. This command does not alter existing information in .git/config. You can then customize the submodule clone URLs in .git/config for your local setup and proceed to `git submodule update`; you can also just use `git submodule update --init` without the explicit 'init' step if you do not intend to customize any submodule locations. ++ + See the add subcommand for the defintion of default remote. deinit [-f|--force] (--all|[--] <path>...):: Unregister the given submodules, i.e. remove the whole diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c index 899dc334e3..44c11dd91e 100644 --- a/builtin/submodule--helper.c +++ b/builtin/submodule--helper.c @@ -356,12 +356,10 @@ static void init_submodule(const char *path, const char *prefix, int quiet) strbuf_addf(&remotesb, "remote.%s.url", remote); free(remote); - if (git_config_get_string(remotesb.buf, &remoteurl)) - /* - * The repository is its own - * authoritative upstream - */ + if (git_config_get_string(remotesb.buf, &remoteurl)) { remoteurl = xgetcwd(); + warning(_("could not lookup configuration '%s'. Assuming this repository is its own authoritative upstream."), remotesb.buf); + } relurl = relative_url(remoteurl, url, NULL); strbuf_release(&remotesb); free(remoteurl); -- 2.12.0.rc1.16.ge4278d41a0.dirty
