Ophestra
e599b5583d
This removes the requirement to call fmsg.Exit on every exit path, and enables direct use of the "log" package. However, fmsg.BeforeExit is still encouraged when possible to catch exit on suspended output. Signed-off-by: Ophestra <cat@gensokyo.uk>
96 lines
2.0 KiB
Go
96 lines
2.0 KiB
Go
package system
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"strconv"
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"git.gensokyo.uk/security/fortify/acl"
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"git.gensokyo.uk/security/fortify/internal/fmsg"
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)
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// CopyFile registers an Op that copies path dst from src.
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func (sys *I) CopyFile(dst, src string) *I {
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return sys.CopyFileType(Process, dst, src)
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}
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// CopyFileType registers a file copying Op labelled with type et.
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func (sys *I) CopyFileType(et Enablement, dst, src string) *I {
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sys.lock.Lock()
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sys.ops = append(sys.ops, &Tmpfile{et, tmpfileCopy, dst, src})
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sys.lock.Unlock()
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sys.UpdatePermType(et, dst, acl.Read)
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return sys
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}
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const (
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tmpfileCopy uint8 = iota
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)
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type Tmpfile struct {
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et Enablement
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method uint8
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dst, src string
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}
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func (t *Tmpfile) Type() Enablement {
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return t.et
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}
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func (t *Tmpfile) apply(_ *I) error {
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switch t.method {
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case tmpfileCopy:
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fmsg.Verbose("publishing tmpfile", t)
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return fmsg.WrapErrorSuffix(copyFile(t.dst, t.src),
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fmt.Sprintf("cannot copy tmpfile %q:", t.dst))
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default:
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panic("invalid tmpfile method " + strconv.Itoa(int(t.method)))
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}
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}
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func (t *Tmpfile) revert(_ *I, ec *Criteria) error {
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if ec.hasType(t) {
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fmsg.Verbosef("removing tmpfile %q", t.dst)
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return fmsg.WrapErrorSuffix(os.Remove(t.dst),
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fmt.Sprintf("cannot remove tmpfile %q:", t.dst))
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} else {
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fmsg.Verbosef("skipping tmpfile %q", t.dst)
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return nil
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}
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}
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func (t *Tmpfile) Is(o Op) bool {
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t0, ok := o.(*Tmpfile)
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return ok && t0 != nil && *t == *t0
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}
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func (t *Tmpfile) Path() string { return t.src }
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func (t *Tmpfile) String() string {
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switch t.method {
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case tmpfileCopy:
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return fmt.Sprintf("%q from %q", t.dst, t.src)
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default:
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panic("invalid tmpfile method " + strconv.Itoa(int(t.method)))
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}
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}
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func copyFile(dst, src string) error {
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dstD, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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srcD, err := os.Open(src)
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if err != nil {
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return errors.Join(err, dstD.Close())
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}
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_, err = io.Copy(dstD, srcD)
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return errors.Join(err, dstD.Close(), srcD.Close())
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}
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