mirror of
https://github.com/denoland/deno.git
synced 2024-11-23 15:16:54 -05:00
85 lines
2.9 KiB
Markdown
85 lines
2.9 KiB
Markdown
## Integrity checking & lock files
|
|
|
|
### Introduction
|
|
|
|
Let's say your module depends on remote module `https://some.url/a.ts`. When you
|
|
compile your module for the first time `a.ts` is retrieved, compiled and cached.
|
|
It will remain this way until you run your module on a new machine (say in
|
|
production) or reload the cache (through `deno cache --reload` for example). But
|
|
what happens if the content in the remote url `https://some.url/a.ts` is
|
|
changed? This could lead to your production module running with different
|
|
dependency code than your local module. Deno's solution to avoid this is to use
|
|
integrity checking and lock files.
|
|
|
|
### Caching and lock files
|
|
|
|
Deno can store and check subresource integrity for modules using a small JSON
|
|
file. Use the `--lock=lock.json` to enable and specify lock file checking. To
|
|
update or create a lock use `--lock=lock.json --lock-write`. The
|
|
`--lock=lock.json` tells Deno what the lock file to use is, while the
|
|
`--lock-write` is used to output dependency hashes to the lock file
|
|
(`--lock-write` must be used in conjunction with `--lock`).
|
|
|
|
A `lock.json` might look like this, storing a hash of the file against the
|
|
dependency:
|
|
|
|
```json
|
|
{
|
|
"https://deno.land/std@$STD_VERSION/textproto/mod.ts": "3118d7a42c03c242c5a49c2ad91c8396110e14acca1324e7aaefd31a999b71a4",
|
|
"https://deno.land/std@$STD_VERSION/io/util.ts": "ae133d310a0fdcf298cea7bc09a599c49acb616d34e148e263bcb02976f80dee",
|
|
"https://deno.land/std@$STD_VERSION/async/delay.ts": "35957d585a6e3dd87706858fb1d6b551cb278271b03f52c5a2cb70e65e00c26a",
|
|
...
|
|
}
|
|
```
|
|
|
|
A typical workflow will look like this:
|
|
|
|
**src/deps.ts**
|
|
|
|
```ts
|
|
// Add a new dependency to "src/deps.ts", used somewhere else.
|
|
export { xyz } from "https://unpkg.com/xyz-lib@v0.9.0/lib.ts";
|
|
```
|
|
|
|
Then:
|
|
|
|
```shell
|
|
# Create/update the lock file "lock.json".
|
|
deno cache --lock=lock.json --lock-write src/deps.ts
|
|
|
|
# Include it when committing to source control.
|
|
git add -u lock.json
|
|
git commit -m "feat: Add support for xyz using xyz-lib"
|
|
git push
|
|
```
|
|
|
|
Collaborator on another machine -- in a freshly cloned project tree:
|
|
|
|
```shell
|
|
# Download the project's dependencies into the machine's cache, integrity
|
|
# checking each resource.
|
|
deno cache --reload --lock=lock.json src/deps.ts
|
|
|
|
# Done! You can proceed safely.
|
|
deno test --allow-read src
|
|
```
|
|
|
|
### Runtime verification
|
|
|
|
Like caching above, you can also use the `--lock=lock.json` option during use of
|
|
the `deno run` sub command, validating the integrity of any locked modules
|
|
during the run. Remember that this only validates against dependencies
|
|
previously added to the `lock.json` file. New dependencies will be cached but
|
|
not validated.
|
|
|
|
You can take this a step further as well by using the `--cached-only` flag to
|
|
require that remote dependencies are already cached.
|
|
|
|
```shell
|
|
deno run --lock=lock.json --cached-only mod.ts
|
|
```
|
|
|
|
This will fail if there are any dependencies in the dependency tree for mod.ts
|
|
which are not yet cached.
|
|
|
|
<!-- TODO - Add detail on dynamic imports -->
|