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docs: simplify git cache instructions (#14562)

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Jeremy Apthorp 2018-09-11 19:06:55 -07:00 committed by Samuel Attard
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docs/development/build-instructions-gn.md
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@ -72,46 +72,6 @@ $ gclient sync --with_branch_heads --with_tags
# This will take a while, go get a coffee.
```
### Chromium git cache
`depot_tools` has an option that allows the developer to set a global cache for
all git objects of Chromium + dependencies. This option uses `git clone
--shared` to save bandwidth/space on multiple clones of the same repositories.
If you intend to have several Electron build trees on the same machine (to work
on different versions of Electron for example), it is recommended to set use
the git cache to speed up the download of Chromium source. For example:
```sh
$ mkdir ~/.chromium-git-cache
$ gclient config \
--name "src/electron" \
--unmanaged \
--cache_dir="$HOME/.chromium-git-cache" \
https://github.com/electron/electron
$ gclient sync --with_branch_heads --with_tags
```
If the bootstrap script is interrupted while using the git cache, it will leave
the cache locked. To remove the lock, pass the `--break_repo_locks` argument to
`gclient sync`.
#### Sharing the cache between multiple machines
It is possible to share this directory with other machines by exporting it as
SMB share on linux, but only one process/machine can be using the cache at a
time. The locks created by git-cache script will try to prevent this, but it may
not work perfectly in a network.
On Windows, SMBv2 has a directory cache that will cause problems with the git
cache script, so it is necessary to disable it by setting the registry key
```sh
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Lanmanworkstation\Parameters\DirectoryCacheLifetime
```
to 0. More information: https://stackoverflow.com/a/9935126
## Building
```sh
@ -224,3 +184,26 @@ the Electron binary:
$ ./out/Default/Electron.app/Contents/MacOS/Electron electron/spec \
--ci --enable-logging -g 'BrowserWindow module'
```
## Sharing the git cache between multiple machines
It is possible to share the gclient git cache with other machines by exporting it as
SMB share on linux, but only one process/machine can be using the cache at a
time. The locks created by git-cache script will try to prevent this, but it may
not work perfectly in a network.
On Windows, SMBv2 has a directory cache that will cause problems with the git
cache script, so it is necessary to disable it by setting the registry key
```sh
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Lanmanworkstation\Parameters\DirectoryCacheLifetime
```
to 0. More information: https://stackoverflow.com/a/9935126
## Troubleshooting
### Stale locks in the git cache
If `gclient sync` is interrupted while using the git cache, it will leave
the cache locked. To remove the lock, pass the `--break_repo_locks` argument to
`gclient sync`.