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// Copyright 2019 The gVisor Authors.
//
// 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 proc
import (
"bytes"
"fmt"
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
)
// versionData implements vfs.DynamicBytesSource for /proc/version.
//
// +stateify savable
type versionData struct {
kernfs.DynamicBytesFile
// k is the owning Kernel.
k *kernel.Kernel
}
var _ dynamicInode = (*versionData)(nil)
// Generate implements vfs.DynamicBytesSource.Generate.
func (v *versionData) Generate(ctx context.Context, buf *bytes.Buffer) error {
init := v.k.GlobalInit()
if init == nil {
// Attempted to read before the init Task is created. This can
// only occur during startup, which should never need to read
// this file.
panic("Attempted to read version before initial Task is available")
}
// /proc/version takes the form:
//
// "SYSNAME version RELEASE (COMPILE_USER@COMPILE_HOST)
// (COMPILER_VERSION) VERSION"
//
// where:
// - SYSNAME, RELEASE, and VERSION are the same as returned by
// sys_utsname
// - COMPILE_USER is the user that build the kernel
// - COMPILE_HOST is the hostname of the machine on which the kernel
// was built
// - COMPILER_VERSION is the version reported by the building compiler
//
// Since we don't really want to expose build information to
// applications, those fields are omitted.
//
// FIXME(mpratt): Using Version from the init task SyscallTable
// disregards the different version a task may have (e.g., in a uts
// namespace).
ver := init.Leader().SyscallTable().Version
fmt.Fprintf(buf, "%s version %s %s\n", ver.Sysname, ver.Release, ver.Version)
return nil
}
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