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cmd/go: document import path meta tag discovery in go help remote

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R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5787059
This commit is contained in:
Brad Fitzpatrick 2012-03-08 11:31:52 -08:00
parent 2c46569f57
commit 312ff5b58e
2 changed files with 84 additions and 2 deletions
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43
src/cmd/go/doc.go
View File

@ -564,7 +564,12 @@ A few common code hosting sites have special syntax:
import "launchpad.net/~user/project/branch"
import "launchpad.net/~user/project/branch/sub/directory"
For code hosted on other servers, an import path of the form
For code hosted on other servers, import paths may either be qualified
with the version control type, or the go tool can dynamically fetch
the import path over https/http and discover where the code resides
from a <meta> tag in the HTML.
To declare the code location, an import path of the form
repository.vcs/path
@ -593,6 +598,42 @@ When a version control system supports multiple protocols,
each is tried in turn when downloading. For example, a Git
download tries git://, then https://, then http://.
If the import path is not a known code hosting site and also lacks a
version control qualifier, the go tool attempts to fetch the import
over https/http and looks for a <meta> tag in the document's HTML
<head>.
The meta tag has the form:
<meta name="go-import" content="import-prefix vcs repo-root">
The import-prefix is the import path correponding to the repository
root. It must be a prefix or an exact match of the package being
fetched with "go get". If it's not an exact match, another http
request is made at the prefix to verify the <meta> tags match.
The vcs is one of "git", "hg", "svn", etc,
The repo-root is the root of the version control system
containing a scheme and not containing a .vcs qualifier.
For example,
import "example.org/pkg/foo"
will result in the following request(s):
https://example.org/pkg/foo?go-get=1 (preferred)
http://example.org/pkg/foo?go-get=1 (fallback)
If that page contains the meta tag
<meta name="go-import" content="example.org git https://code.org/r/p/exproj">
the go tool will verify that https://example.org/?go-get=1 contains the
same meta tag and then git clone https://code.org/r/p/exproj into
GOPATH/src/example.org.
New downloaded packages are written to the first directory
listed in the GOPATH environment variable (see 'go help gopath').

43
src/cmd/go/help.go
View File

@ -96,7 +96,12 @@ A few common code hosting sites have special syntax:
import "launchpad.net/~user/project/branch"
import "launchpad.net/~user/project/branch/sub/directory"
For code hosted on other servers, an import path of the form
For code hosted on other servers, import paths may either be qualified
with the version control type, or the go tool can dynamically fetch
the import path over https/http and discover where the code resides
from a <meta> tag in the HTML.
To declare the code location, an import path of the form
repository.vcs/path
@ -125,6 +130,42 @@ When a version control system supports multiple protocols,
each is tried in turn when downloading. For example, a Git
download tries git://, then https://, then http://.
If the import path is not a known code hosting site and also lacks a
version control qualifier, the go tool attempts to fetch the import
over https/http and looks for a <meta> tag in the document's HTML
<head>.
The meta tag has the form:
<meta name="go-import" content="import-prefix vcs repo-root">
The import-prefix is the import path correponding to the repository
root. It must be a prefix or an exact match of the package being
fetched with "go get". If it's not an exact match, another http
request is made at the prefix to verify the <meta> tags match.
The vcs is one of "git", "hg", "svn", etc,
The repo-root is the root of the version control system
containing a scheme and not containing a .vcs qualifier.
For example,
import "example.org/pkg/foo"
will result in the following request(s):
https://example.org/pkg/foo?go-get=1 (preferred)
http://example.org/pkg/foo?go-get=1 (fallback)
If that page contains the meta tag
<meta name="go-import" content="example.org git https://code.org/r/p/exproj">
the go tool will verify that https://example.org/?go-get=1 contains the
same meta tag and then git clone https://code.org/r/p/exproj into
GOPATH/src/example.org.
New downloaded packages are written to the first directory
listed in the GOPATH environment variable (see 'go help gopath').