mirror of
https://gerrit.googlesource.com/git-repo
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979d5bdc3e
This provides initial support for using git worktrees internally instead of our own ad-hoc symlink tree. It's been lightly tested which is why it's not currently exposed via --help. When people opt-in to worktrees in an existing repo client checkout, no projects are migrated. Instead, only new projects will use the worktree method. This allows for limited testing/opting in without having to completely blow things away or get a second checkout. Bug: https://crbug.com/gerrit/11486 Change-Id: Ic3ff891b30940a6ba497b406b2a387e0a8517ed8 Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/254075 Tested-by: Mike Frysinger <vapier@google.com> Reviewed-by: Mike Frysinger <vapier@google.com>
211 lines
10 KiB
Markdown
211 lines
10 KiB
Markdown
# Repo internal filesystem layout
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A reference to the `.repo/` tree in repo client checkouts.
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Hopefully it's complete & up-to-date, but who knows!
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*** note
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**Warning**:
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This is meant for developers of the repo project itself as a quick reference.
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**Nothing** in here must be construed as ABI, or that repo itself will never
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change its internals in backwards incompatible ways.
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***
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[TOC]
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## .repo/ layout
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All content under `.repo/` is managed by `repo` itself with few exceptions.
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In general, you should not make manual changes in here.
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If a setting was initialized using an option to `repo init`, you should use that
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command to change the setting later on.
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It is always safe to re-run `repo init` in existing repo client checkouts.
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For example, if you want to change the manifest branch, you can simply run
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`repo init --manifest-branch=<new name>` and repo will take care of the rest.
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### repo/ state
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* `repo/`: A git checkout of the repo project. This is how `repo` re-execs
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itself to get the latest released version.
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It tracks the git repository at `REPO_URL` using the `REPO_REV` branch.
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Those are specified at `repo init` time using the `--repo-url=<REPO_URL>`
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and `--repo-branch=<REPO_REV>` options.
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Any changes made to this directory will usually be automatically discarded
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by repo itself when it checks for updates. If you want to update to the
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latest version of repo, use `repo selfupdate` instead. If you want to
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change the git URL/branch that this tracks, re-run `repo init` with the new
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settings.
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* `.repo_fetchtimes.json`: Used by `repo sync` to record stats when syncing
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the various projects.
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### Manifests
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For more documentation on the manifest format, including the local_manifests
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support, see the [manifest-format.md] file.
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* `manifests/`: A git checkout of the manifest project. Its `.git/` state
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points to the `manifest.git` bare checkout (see below). It tracks the git
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branch specified at `repo init` time via `--manifest-branch`.
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The local branch name is always `default` regardless of the remote tracking
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branch. Do not get confused if the remote branch is not `default`, or if
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there is a remote `default` that is completely different!
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No manual changes should be made in here as it will just confuse repo and
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it won't automatically recover causing no new changes to be picked up.
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* `manifests.git/`: A bare checkout of the manifest project. It tracks the
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git repository specified at `repo init` time via `--manifest-url`.
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No manual changes should be made in here as it will just confuse repo.
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If you want to switch the tracking settings, re-run `repo init` with the
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new settings.
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* `manifest.xml -> manifests/<manifest-name>.xml`: A symlink to the manifest
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that the user wishes to sync. It is specified at `repo init` time via
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`--manifest-name`.
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Do not try to repoint this symlink to other files as it will confuse repo.
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If you want to switch manifest files, re-run `repo init` with the new
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setting.
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* `manifests.git/.repo_config.json`: JSON cache of the `manifests.git/config`
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file for repo to read/process quickly.
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* `local_manifest.xml` (*Deprecated*): User-authored tweaks to the manifest
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used to sync. See [local manifests] for more details.
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* `local_manifests/`: Directory of user-authored manifest fragments to tweak
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the manifest used to sync. See [local manifests] for more details.
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### Project objects
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* `project.list`: Tracking file used by `repo sync` to determine when projects
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are added or removed and need corresponding updates in the checkout.
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* `projects/`: Bare checkouts of every project synced by the manifest. The
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filesystem layout matches the `<project path=...` setting in the manifest
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(i.e. where it's checked out in the repo client source tree). Those
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checkouts will symlink their `.git/` state to paths under here.
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Some git state is further split out under `project-objects/`.
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* `project-objects/`: Git objects that are safe to share across multiple
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git checkouts. The filesystem layout matches the `<project name=...`
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setting in the manifest (i.e. the path on the remote server). This allows
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for multiple checkouts of the same remote git repo to share their objects.
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For example, you could have different branches of `foo/bar.git` checked
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out to `foo/bar-master`, `foo/bar-release`, etc... There will be multiple
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trees under `projects/` for each one, but only one under `project-objects/`.
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This can run into problems if different remotes use the same path on their
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respective servers ...
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* `subprojects/`: Like `projects/`, but for git submodules.
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* `subproject-objects/`: Like `project-objects/`, but for git submodules.
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* `worktrees/`: Bare checkouts of every project synced by the manifest. The
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filesystem layout matches the `<project name=...` setting in the manifest
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(i.e. the path on the remote server).
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This is used when git worktrees are enabled.
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### Global settings
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The `.repo/manifests.git/config` file is used to track settings for the entire
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repo client checkout.
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Most settings use the `[repo]` section to avoid conflicts with git.
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User controlled settings are initialized when running `repo init`.
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| Setting | `repo init` Option | Use/Meaning |
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|-------------------|---------------------------|-------------|
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| manifest.groups | `--groups` & `--platform` | The manifest groups to sync |
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| repo.archive | `--archive` | Use `git archive` for checkouts |
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| repo.clonefilter | `--clone-filter` | Filter setting when using [partial git clones] |
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| repo.depth | `--depth` | Create shallow checkouts when cloning |
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| repo.dissociate | `--dissociate` | Dissociate from any reference/mirrors after initial clone |
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| repo.mirror | `--mirror` | Checkout is a repo mirror |
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| repo.partialclone | `--partial-clone` | Create [partial git clones] |
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| repo.reference | `--reference` | Reference repo client checkout |
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| repo.submodules | `--submodules` | Sync git submodules |
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| repo.worktree | `--worktree` | Use `git worktree` for checkouts |
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| user.email | `--config-name` | User's e-mail address; Copied into `.git/config` when checking out a new project |
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| user.name | `--config-name` | User's name; Copied into `.git/config` when checking out a new project |
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[partial git clones]: https://git-scm.com/docs/gitrepository-layout#_code_partialclone_code
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### Repo hooks settings
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For more details on this feature, see the [repo-hooks docs](./repo-hooks.md).
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We'll just discuss the internal configuration settings.
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These are stored in the registered `<repo-hooks>` project itself, so if the
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manifest switches to a different project, the settings will not be copied.
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| Setting | Use/Meaning |
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|--------------------------------------|-------------|
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| repo.hooks.\<hook\>.approvedmanifest | User approval for secure manifest sources (e.g. https://) |
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| repo.hooks.\<hook\>.approvedhash | User approval for insecure manifest sources (e.g. http://) |
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For example, if our manifest had the following entries, we would store settings
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under `.repo/projects/src/repohooks.git/config` (which would be reachable via
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`git --git-dir=src/repohooks/.git config`).
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```xml
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<project path="src/repohooks" name="chromiumos/repohooks" ... />
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<repo-hooks in-project="chromiumos/repohooks" ... />
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```
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If `<hook>` is `pre-upload`, the `.git/config` setting might be:
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```ini
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[repo "hooks.pre-upload"]
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approvedmanifest = https://chromium.googlesource.com/chromiumos/manifest
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```
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## Per-project settings
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These settings are somewhat meant to be tweaked by the user on a per-project
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basis (e.g. `git config` in a checked out source repo).
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Where possible, we re-use standard git settings to avoid confusion, and we
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refrain from documenting those, so see [git-config] documentation instead.
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See `repo help upload` for documentation on `[review]` settings.
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The `[remote]` settings are automatically populated/updated from the manifest.
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The `[branch]` settings are updated by `repo start` and `git branch`.
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| Setting | Subcommands | Use/Meaning |
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|-------------------------------|---------------|-------------|
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| review.\<url\>.autocopy | upload | Automatically add to `--cc=<value>` |
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| review.\<url\>.autoreviewer | upload | Automatically add to `--reviewers=<value>` |
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| review.\<url\>.autoupload | upload | Automatically answer "yes" or "no" to all prompts |
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| review.\<url\>.uploadhashtags | upload | Automatically add to `--hashtags=<value>` |
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| review.\<url\>.uploadtopic | upload | Default [topic] to use |
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| review.\<url\>.username | upload | Override username with `ssh://` review URIs |
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| remote.\<remote\>.fetch | sync | Set of refs to fetch |
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| remote.\<remote\>.projectname | \<network\> | The name of the project as it exists in Gerrit review |
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| remote.\<remote\>.pushurl | upload | The base URI for pushing CLs |
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| remote.\<remote\>.review | upload | The URI of the Gerrit review server |
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| remote.\<remote\>.url | sync & upload | The URI of the git project to fetch |
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| branch.\<branch\>.merge | sync & upload | The branch to merge & upload & track |
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| branch.\<branch\>.remote | sync & upload | The remote to track |
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## ~/ dotconfig layout
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Repo will create & maintain a few files in the user's home directory.
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* `.repoconfig/`: Repo's per-user directory for all random config files/state.
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* `.repoconfig/keyring-version`: Cache file for checking if the gnupg subdir
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has all the same keys as the repo launcher. Used to avoid running gpg
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constantly as that can be quite slow.
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* `.repoconfig/gnupg/`: GnuPG's internal state directory used when repo needs
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to run `gpg`. This provides isolation from the user's normal `~/.gnupg/`.
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* `.repo_.gitconfig.json`: JSON cache of the `.gitconfig` file for repo to
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read/process quickly.
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[git-config]: https://git-scm.com/docs/git-config
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[manifest-format.md]: ./manifest-format.md
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[local manifests]: ./manifest-format.md#Local-Manifests
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[topic]: https://gerrit-review.googlesource.com/Documentation/intro-user.html#topics
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