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/*******************************************************************************
*
* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
package rtree
import (
"bytes"
"net/url"
"os/exec"
"path/filepath"
"regexp"
"strings"
"github.com/majewsky/gofu/pkg/util"
)
//remoteAlias describes an alias that can be used in a Git remote URL (as
//defined by the "url.<base>.insteadOf" directive in man:git-config(1)).
type remoteAlias struct {
Alias string
Replacement string
}
var remoteAliases []*remoteAlias
func init() {
cmd := exec.Command("git", "config", "--global", "-l")
var buf bytes.Buffer
cmd.Stdout = &buf
util.FatalIfError(cmd.Run())
rx := regexp.MustCompile(`^url\.([^=]+)\.insteadof=(.+)$`)
for _, line := range strings.Split(string(buf.Bytes()), "\n") {
match := rx.FindStringSubmatch(line)
if match == nil {
continue
}
remoteAliases = append(remoteAliases, &remoteAlias{
Alias: match[2],
Replacement: match[1],
})
}
}
//ExpandRemoteURL derive the canonical URL for a given remote by substituting
//aliases defined in the system-wide and user-global Git config. For example,
//with
//
// $ cat /etc/gitconfig
// [url "git://github.com/"]
// insteadOf = gh:
//
//and the input "gh:foo/bar", this function returns "git://github.com/foo/bar".
func ExpandRemoteURL(remoteURL string) string {
var best *remoteAlias
for _, current := range remoteAliases {
if strings.HasPrefix(remoteURL, current.Alias) {
if best == nil || len(best.Alias) < len(current.Alias) {
best = current
}
}
}
if best == nil {
return remoteURL
}
return best.Replacement + strings.TrimPrefix(remoteURL, best.Alias)
}
//This regex recognizes the scp-like syntax for git remotes
//(i.e. "[user@]example.org:path/to/repo") as specified by the "GIT URLS"
//section of man:git-clone(1).
var scpSyntaxRx = regexp.MustCompile(`^(?:[^/@:]+@)?([^/:]+\.[^/:]+):(.+)$`)
//CheckoutPathForRemoteURL derives the checkout path for a remote URL that has
//already been expanded with ExpandRemoteURL() if necessary.
//
// "https://example.org/foo/bar" -> "example.org/foo/bar"
// "git@example.org:foo/bar" -> "example.org/foo/bar"
//
func CheckoutPathForRemoteURL(remoteURL string) string {
match := scpSyntaxRx.FindStringSubmatch(remoteURL)
if match != nil {
//match[1] is the hostname, match[2] is the path to the repo
return filepath.Join(match[1], match[2])
}
u, err := url.Parse(remoteURL)
util.FatalIfError(err)
return filepath.Join(u.Hostname(), u.Path)
}
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