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mount.go
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mount.go
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// +build linux darwin
/*
* btrfscue version 0.4
* Copyright (c)2011-2017 Christian Blichmann
*
* Sub-command to provide and mount a "rescue fs"
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package main
import (
"flag"
"os"
"os/signal"
"syscall"
"blichmann.eu/code/btrfscue/btrfs/index"
"blichmann.eu/code/btrfscue/rescuefs"
"blichmann.eu/code/btrfscue/subcommand"
)
type mountCommand struct {
}
func (c *mountCommand) DefineFlags(fs *flag.FlagSet) {
}
func (c *mountCommand) Run(args []string) {
if len(args) == 0 {
fatalf("missing mount point\n")
}
if len(args) > 2 {
fatalf("extra operand '%s'\n", args[2])
}
if len(*metadata) == 0 {
fatalf("missing metadata option\n")
}
ix, err := index.OpenReadOnly(*metadata)
reportError(err)
defer ix.Close()
mountPoint := args[len(args)-1]
var dev *os.File
defer func() {
if dev != nil {
dev.Close()
}
}()
if len(args) == 2 {
dev, err = os.Open(args[1])
reportError(err)
} else {
warnf("no device file given, only inline file data will be visible\n")
}
fs := rescuefs.New(*metadata, ix, dev)
reportError(fs.Mount(mountPoint))
verbosef("mounted rescue FS on %s\n", mountPoint)
go fs.Serve()
// Break and unmount on CTRL+C or TERM signal
ch := make(chan os.Signal, 1)
signal.Notify(ch, os.Interrupt, syscall.SIGTERM)
_ = <-ch
warnf("got signal, unmounting...\n")
reportError(fs.Unmount())
}
func init() {
subcommand.Register("mount",
"provide a 'rescue' filesystem backed by metadata", &mountCommand{})
}