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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016-2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package snapdtool_test
import (
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
. "gopkg.in/check.v1"
"github.com/snapcore/snapd/dirs"
"github.com/snapcore/snapd/dirs/dirstest"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/release"
"github.com/snapcore/snapd/snapdtool"
)
var truePath = osutil.LookPathDefault("true", "/bin/true")
type cmdutilSuite struct{}
var _ = Suite(&cmdutilSuite{})
func (s *cmdutilSuite) SetUpTest(c *C) {
dirs.SetRootDir(c.MkDir())
}
func (s *cmdutilSuite) TearDownTest(c *C) {
dirs.SetRootDir("")
}
func (s *cmdutilSuite) makeMockLdSoConf(c *C, root string) {
ldSoConf := filepath.Join(root, "/etc/ld.so.conf")
ldSoConfD := ldSoConf + ".d"
err := os.MkdirAll(filepath.Dir(ldSoConf), 0755)
c.Assert(err, IsNil)
err = os.MkdirAll(ldSoConfD, 0755)
c.Assert(err, IsNil)
err = os.WriteFile(ldSoConf, []byte("include /etc/ld.so.conf.d/*.conf"), 0644)
c.Assert(err, IsNil)
ldSoConf1 := filepath.Join(ldSoConfD, "x86_64-linux-gnu.conf")
err = os.WriteFile(ldSoConf1, []byte(`
# Multiarch support
/lib/x86_64-linux-gnu
/usr/lib/x86_64-linux-gnu`), 0644)
c.Assert(err, IsNil)
}
func (s *cmdutilSuite) TestCommandFromSystemSnapOldTrick(c *C) {
root := filepath.Join(dirs.SnapMountDir, "core", "current")
s.makeMockLdSoConf(c, root)
os.MkdirAll(filepath.Join(root, "/usr/bin"), 0755)
osutil.CopyFile(truePath, filepath.Join(root, "/usr/bin/xdelta3"), 0)
cmd, err := snapdtool.CommandFromSystemSnap("/usr/bin/xdelta3", "--some-xdelta-arg")
c.Assert(err, IsNil)
out, err := exec.Command("/bin/sh", "-c", fmt.Sprintf("readelf -l %s |grep interpreter:|cut -f2 -d:|cut -f1 -d]", truePath)).Output()
c.Assert(err, IsNil)
interp := strings.TrimSpace(string(out))
c.Check(cmd.Args, DeepEquals, []string{
filepath.Join(root, interp),
"--library-path",
fmt.Sprintf("%s/lib/x86_64-linux-gnu:%s/usr/lib/x86_64-linux-gnu", root, root),
filepath.Join(root, "/usr/bin/xdelta3"),
"--some-xdelta-arg",
})
}
func (s *cmdutilSuite) TestCommandFromSystemSnapNoTrickNeeded(c *C) {
dirstest.MustMockCanonicalSnapMountDir(dirs.GlobalRootDir)
dirs.SetRootDir(dirs.GlobalRootDir)
c.Logf("mount dir: %v", dirs.SnapMountDir)
root := filepath.Join(dirs.SnapMountDir, "snapd", "current")
os.MkdirAll(filepath.Join(root, "/usr/bin"), 0755)
osutil.CopyFile(truePath, filepath.Join(root, "/usr/bin/xdelta3"), 0)
cmd, err := snapdtool.CommandFromSystemSnap("/usr/bin/xdelta3", "--some-xdelta-arg")
c.Assert(err, IsNil)
c.Check(cmd.Args, DeepEquals, []string{
filepath.Join(root, "/usr/bin/xdelta3"),
"--some-xdelta-arg",
})
}
func (s *cmdutilSuite) TestCommandFromSystemSnapNoTrickNeededSymlink(c *C) {
defer release.MockReleaseInfo(&release.OS{ID: "fedora"})()
dirs.SetRootDir(dirs.GlobalRootDir)
c.Logf("mount dir: %v", dirs.SnapMountDir)
root := filepath.Join(dirs.SnapMountDir, "snapd", "current")
c.Assert(os.Symlink(filepath.Join(dirs.SnapMountDir), filepath.Join(dirs.GlobalRootDir, "snap")), IsNil)
os.MkdirAll(filepath.Join(root, "/usr/bin"), 0755)
osutil.CopyFile(truePath, filepath.Join(root, "/usr/bin/xdelta3"), 0)
cmd, err := snapdtool.CommandFromSystemSnap("/usr/bin/xdelta3", "--some-xdelta-arg")
c.Assert(err, IsNil)
c.Check(cmd.Args, DeepEquals, []string{
filepath.Join(root, "/usr/bin/xdelta3"),
"--some-xdelta-arg",
})
}
func (s *cmdutilSuite) TestCommandFromSystemSnapLDsoTrickNeeded(c *C) {
defer release.MockReleaseInfo(&release.OS{ID: "fedora"})()
dirs.SetRootDir(dirs.GlobalRootDir)
defer snapdtool.MockElfInterp(func(p string) (string, error) {
c.Assert(p, Equals, filepath.Join(dirs.SnapMountDir, "snapd/current/usr/bin/xdelta3"))
return filepath.Join(dirs.GlobalRootDir, "/snap/snapd/current/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2"), nil
})()
root := filepath.Join(dirs.SnapMountDir, "snapd", "current")
os.MkdirAll(filepath.Join(root, "/usr/bin"), 0755)
osutil.CopyFile(truePath, filepath.Join(root, "/usr/bin/xdelta3"), 0)
cmd, err := snapdtool.CommandFromSystemSnap("/usr/bin/xdelta3", "--some-xdelta-arg")
c.Assert(err, IsNil)
c.Check(cmd.Args, DeepEquals, []string{
filepath.Join(dirs.SnapMountDir, "snapd/current/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2"),
"--library-path",
filepath.Join(dirs.SnapMountDir, "snapd/current/usr/lib/x86_64-linux-gnu"),
filepath.Join(dirs.SnapMountDir, "snapd/current//usr/bin/xdelta3"),
"--some-xdelta-arg",
})
}
func (s *cmdutilSuite) TestCommandFromCoreSymlinkCycle(c *C) {
root := filepath.Join(dirs.SnapMountDir, "/core/current")
s.makeMockLdSoConf(c, root)
os.MkdirAll(filepath.Join(root, "/usr/bin"), 0755)
osutil.CopyFile(truePath, filepath.Join(root, "/usr/bin/xdelta3"), 0)
out, err := exec.Command("/bin/sh", "-c", "readelf -l /bin/true |grep interpreter:|cut -f2 -d:|cut -f1 -d]").Output()
c.Assert(err, IsNil)
interp := strings.TrimSpace(string(out))
coreInterp := filepath.Join(root, interp)
c.Assert(os.MkdirAll(filepath.Dir(coreInterp), 0755), IsNil)
c.Assert(os.Symlink(filepath.Base(coreInterp), coreInterp), IsNil)
_, err = snapdtool.CommandFromSystemSnap("/usr/bin/xdelta3", "--some-xdelta-arg")
c.Assert(err, ErrorMatches, "cannot run command from core: symlink cycle found")
}
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