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96 lines
3.1 KiB
Markdown
96 lines
3.1 KiB
Markdown
<!--
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tagline: Configure which packages are found in which repositories
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-->
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# Repository priorities
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## Canonical repositories
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When Composer resolves dependencies, it will look up a given package in the
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topmost repository. If that repository does not contain the package, it
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goes on to the next one, until one repository contains it and the process ends.
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Canonical repositories are better for a few reasons:
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- Performance wise, it is more efficient to stop looking for a package once it
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has been found somewhere. It also avoids loading duplicate packages in case
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the same package is present in several of your repositories.
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- Security wise, it is safer to treat them canonically as it means that packages you
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expect to come from your most important repositories will never be loaded from
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another repository instead. Let's
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say you have a private repository which is not canonical, and you require your
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private package `foo/bar ^2.0` for example. Now if someone publishes
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`foo/bar 2.999` to packagist.org, suddenly Composer will pick that package as it
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has a higher version than your latest release (say 2.4.3), and you end up installing
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something you may not have meant to. If the private repository is canonical
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however, that 2.999 version from packagist.org will not be considered at all.
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There are however a few cases where you may want to specifically load some packages
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from a given repository, but not all. Or you may want a given repository to not be
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canonical, and to be only preferred if it has higher package versions than the
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repositories defined below.
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## Default behavior
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By default in Composer 2.x all repositories are canonical. Composer 1.x treated
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all repositories as non-canonical.
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Another default is that the packagist.org repository is always added implicitly
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as the last repository, unless you [disable it](../05-repositories.md#disabling-packagist-org).
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## Making repositories non-canonical
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You can add the canonical option to any repository to disable this default behavior
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and make sure Composer keeps looking in other repositories, even if that repository
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contains a given package.
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```json
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{
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"repositories": [
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{
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"type": "composer",
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"url": "https://example.org",
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"canonical": false
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}
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]
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}
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```
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## Filtering packages
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You can also filter packages which a repository will be able to load, either by
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selecting which ones you want, or by excluding those you do not want.
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For example here we want to pick only the package `foo/bar` and all the packages from
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`some-vendor/` from this composer repository.
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```json
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{
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"repositories": [
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{
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"type": "composer",
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"url": "https://example.org",
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"only": ["foo/bar", "some-vendor/*"]
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}
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]
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}
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```
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And in this other example we exclude `toy/package` from a repository, which
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we may not want to load in this project.
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```json
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{
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"repositories": [
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{
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"type": "composer",
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"url": "https://example.org",
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"exclude": ["toy/package"]
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}
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]
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}
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```
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Both `only` and `exclude` should be arrays of package names, which can also
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contain wildcards (`*`) which will match any characters.
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