syscallcompat: rename thread_credentials files to include "linux"

As with the other files, include "linux" because the code only
builds on linux

renamed:    internal/syscallcompat/thread_credentials.go -> internal/syscallcompat/thread_credentials_linux.go
renamed:    internal/syscallcompat/thread_credentials_368_arm.go -> internal/syscallcompat/thread_credentials_linux_368_arm.go
renamed:    internal/syscallcompat/thread_credentials_other.go -> internal/syscallcompat/thread_credentials_linux_other.go

1 files changed, 0 insertions, 60 deletions

diff --git a/internal/syscallcompat/thread_credentials.go b/internal/syscallcompat/thread_credentials.go
deleted file mode 100644
index 8cfb703..0000000
--- a/internal/syscallcompat/thread_credentials.go
+++ /dev/null
@@ -1,60 +0,0 @@
-//go:build linux
-
-// golang.org/x/sys/unix commit
-// https://github.com/golang/sys/commit/d0df966e6959f00dc1c74363e537872647352d51
-// changed unix.Setreuid/unix.Setregid functions to affect the whole thread, which is
-// what gocryptfs does NOT want (https://github.com/rfjakob/gocryptfs/issues/893).
-// The functions Setreuid/Setegid are copy-pasted from one commit before
-// (9e1f76180b77a12eb07c82eb8e1ea8a7f8d202e7).
-//
-// Looking at the diff at https://github.com/golang/sys/commit/d0df966e6959f00dc1c74363e537872647352d51
-// we see that only two architectures, 386 and arm, use SYS_SETREUID32/SYS_SETREGID32
-// (see "man 2 setreuid" for why).
-// All the others architectures use SYS_SETREUID/SYS_SETREGID.
-//
-// As of golang.org/x/sys/unix v0.30.0, Setgroups/setgroups is still per-thread, but
-// it is likely that this will change, too. Setgroups/setgroups are copy-pasted from
-// v0.30.0. The SYS_SETGROUPS32/SYS_SETGROUPS split is the same as for Setreuid.
-//
-// Note: _Gid_t is always uint32 on linux, so we can directly use uint32 for setgroups.
-package syscallcompat
-
-import (
-	"log"
-)
-
-func Setgroups(gids []int) (err error) {
-	if len(gids) == 0 {
-		return setgroups(0, nil)
-	}
-
-	a := make([]uint32, len(gids))
-	for i, v := range gids {
-		a[i] = uint32(v)
-	}
-	return setgroups(len(a), &a[0])
-}
-
-// SetgroupsPanic calls Setgroups and panics on error
-func SetgroupsPanic(gids []int) {
-	err := Setgroups(gids)
-	if err != nil {
-		log.Panic(err)
-	}
-}
-
-// SetregidPanic calls Setregid and panics on error
-func SetregidPanic(rgid int, egid int) {
-	err := Setregid(rgid, egid)
-	if err != nil {
-		log.Panic(err)
-	}
-}
-
-// SetreuidPanic calls Setreuid and panics on error
-func SetreuidPanic(ruid int, euid int) {
-	err := Setreuid(ruid, euid)
-	if err != nil {
-		log.Panic(err)
-	}
-}