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gem.go
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gem.go
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// Copyright 2019 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package packages
import (
"context"
"runtime"
"strings"
"time"
"github.com/GoogleCloudPlatform/osconfig/clog"
"github.com/GoogleCloudPlatform/osconfig/util"
)
var (
gem string
gemListArgs = []string{"list", "--local"}
gemOutdatedArgs = []string{"outdated", "--local"}
gemListTimeout = 15 * time.Second
gemOutdatedTimeout = 15 * time.Second
)
func init() {
if runtime.GOOS != "windows" {
gem = "/usr/bin/gem"
}
GemExists = util.Exists(gem)
}
// GemUpdates queries for all available gem updates.
func GemUpdates(ctx context.Context) ([]*PkgInfo, error) {
stdout, err := runWithDeadline(ctx, gemOutdatedTimeout, gem, gemOutdatedArgs)
if err != nil {
return nil, err
}
/*
foo (1.2.8 < 1.3.2)
bar (1.0.0 < 1.1.2)
...
*/
lines := strings.Split(strings.TrimSpace(string(stdout)), "\n")
if len(lines) == 0 {
return nil, nil
}
var pkgs []*PkgInfo
for _, ln := range lines {
pkg := strings.Fields(ln)
if len(pkg) != 4 {
clog.Debugf(ctx, "%q does not represent a gem update\n", ln)
continue
}
ver := strings.Trim(pkg[3], ")")
pkgs = append(pkgs, &PkgInfo{Name: pkg[0], Arch: noarch, Version: ver})
}
return pkgs, nil
}
// InstalledGemPackages queries for all installed gem packages.
func InstalledGemPackages(ctx context.Context) ([]*PkgInfo, error) {
stdout, err := runWithDeadline(ctx, gemListTimeout, gem, gemListArgs)
if err != nil {
return nil, err
}
/*
*** LOCAL GEMS ***
foo (1.2.3, 1.2.4)
bar (1.2.3)
...
*/
lines := strings.Split(strings.TrimSpace(string(stdout)), "\n")
if len(lines) == 0 {
clog.Debugf(ctx, "No gems installed.")
return nil, nil
}
var pkgs []*PkgInfo
for _, ln := range lines[2:] {
pkg := strings.Fields(ln)
if len(pkg) < 2 {
clog.Debugf(ctx, "'%s' does not represent a gem", ln)
continue
}
for _, ver := range strings.Split(strings.Trim(pkg[1], "()"), ", ") {
pkgs = append(pkgs, &PkgInfo{Name: pkg[0], Arch: noarch, Version: ver})
}
}
return pkgs, nil
}