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/
schroot.go
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/
schroot.go
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/* {{{ Copyright (c) Paul R. Tagliamonte <paultag@debian.org>, 2015
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE. }}} */
package schroot
import (
"fmt"
"strings"
"os/exec"
)
// {{{ Command helpers
func getOutputLine(cmd *exec.Cmd) (string, error) {
out, err := cmd.Output()
if err != nil {
return "", err
}
return strings.Trim(string(out), " \n\t\r"), nil
}
// }}}
// Schroot object encapsulation. Contains lightweight amounts of state, so
// it's advised that you pass a pointer to this around.
type Schroot struct {
location string
name string
session string
active bool
}
// Close the schroot session, killing the open session from schroot. To
// see how many you've left open because you forgot to call this method,
// run `schroot -l --all-sessions`. To close them, run
// `schroot -e -c session:xxxx` (where session:xxxx is the name, as seen
// in schroot -l output)
//
// It's advised that you `defer` this whenever creating a new schroot.
func (schroot *Schroot) End() error {
err := exec.Command("schroot", "-e", "-c", schroot.session).Run()
schroot.active = false
return err
}
// Create a os/exec.Cmd to run the command inside the schroot chroot. Keep
// in mind that we're not currently smart enough to deal with things like
// the enviorn in a native way, so don't get too cute.
func (schroot *Schroot) Command(cmd string, args ...string) (*exec.Cmd, error) {
/* The semantics of foo(bar, baz, quix...) are so fucked up here
* it's not even funny. Let's do an append and unpack that. Sorry
* this looks like garbage, but it's either explicitly passing the
* elements into the call site, or use a foo... with nothing prefixing
* it. Sooo. Yeah.
* -- PRT */
if !schroot.active {
return nil, fmt.Errorf("Error: Schroot is not online")
}
return exec.Command(
"schroot",
append(
[]string{
"-r",
"-c", schroot.session,
"--directory", "/",
"--",
cmd,
}, args...)...,
), nil
}
// Create a new schroot based on the chroot name. To get an idea
// of what chroots exist on the system, run `schroot -l --all-chroots`.
func NewSchroot(name string) (*Schroot, error) {
schroot := Schroot{
name: name,
active: false,
}
out, err := getOutputLine(exec.Command("schroot", "-b", "-c", name))
if err != nil {
return nil, err
}
schroot.session = out
schroot.active = true
out, err = getOutputLine(exec.Command(
"schroot", "--location",
"-c", fmt.Sprintf("session:%s", schroot.session),
))
if err != nil {
return nil, err
}
schroot.location = out
return &schroot, nil
}
// vim: foldmethod=marker