mirror of
https://github.com/containers/podman.git
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5875e409e2
psgo added support for listing supplementary groups via two new descriptors: * `groups` for supplementary groups inside the container * `hgroups` for the counterpart on the host Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
// Copyright 2018 psgo authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package host extracts data from the host, such as the system's boot time or
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// the tick rate of the system clock.
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package host
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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// BootTime parses /proc/uptime returns the boot time in seconds since the
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// Epoch, 1970-01-01 00:00:00 +0000 (UTC).
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func BootTime() (int64, error) {
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if bootTime != nil {
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return *bootTime, nil
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}
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f, err := os.Open("/proc/stat")
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if err != nil {
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return 0, err
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}
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btimeStr := ""
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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fields := strings.Fields(scanner.Text())
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if len(fields) < 2 {
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continue
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}
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if fields[0] == "btime" {
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btimeStr = fields[1]
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}
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}
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if len(btimeStr) == 0 {
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return 0, fmt.Errorf("couldn't extract boot time from /proc/stat")
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}
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btimeSec, err := strconv.ParseInt(btimeStr, 10, 64)
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if err != nil {
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return 0, fmt.Errorf("error parsing boot time from /proc/stat: %w", err)
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}
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bootTime = &btimeSec
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return btimeSec, nil
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}
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