tests: use chroot --user rather than internal setuidgid tool

* init.cfg (require_root_): Adjust to use chroot, and make
`require_built_ chroot` implicit when chroot used in the test.
* po/POTFILES.in: Remove reference to setuidgid tool.
* src/.gitignore: Likewise.
* src/local.mk: Likewise.
* src/setuidgid.c: Remove.
* tests/cp/preserve-gid.sh: s/setuidgid/chroot --user/.
* tests/cp/special-bits.sh: Likewise.
* tests/id/setgid.sh: Likewise.
* tests/misc/truncate-owned-by-other.sh
* tests/mv/sticky-to-xpart.sh: Likewise.
* tests/rm/fail-2eperm.sh: Likewise.
* tests/rm/no-give-up.sh: Likewise.
* tests/touch/now-owned-by-other.sh: Likewise.
* tests/misc/chroot-fail.sh: Skip if chroot not built.

1 files changed, 8 insertions, 6 deletions

diff --git a/init.cfg b/init.cfg
index bf1887f8d..e225bd6d6 100644
--- a/init.cfg
+++ b/init.cfg
@@ -393,12 +393,14 @@ or use the shortcut target of the toplevel Makefile,
   fi
 }
 
-# Test whether we can run our just-built rm setuidgid-to-root,
+# Test whether we can run our just-built root owned rm,
 # i.e., that $NON_ROOT_USERNAME has access to the build directory.
-setuidgid_has_perm_()
+nonroot_has_perm_()
 {
+  require_built_ chroot
+
   local rm_version=$(
-    setuidgid $NON_ROOT_USERNAME env PATH="$PATH" rm --version |
+    chroot --user=$NON_ROOT_USERNAME / env PATH="$PATH" rm --version |
     sed -n '1s/.* //p'
   )
   case ":$rm_version:" in
@@ -413,10 +415,10 @@ require_root_()
   NON_ROOT_USERNAME=${NON_ROOT_USERNAME=nobody}
   NON_ROOT_GROUP=${NON_ROOT_GROUP=$(id -g $NON_ROOT_USERNAME)}
 
-  # When the current test invokes setuidgid, call setuidgid_has_perm_
+  # When the current test invokes chroot, call nonroot_has_perm_
   # to check for a common problem.
-  grep '^[ ]*setuidgid' "../$0" \
-    && { setuidgid_has_perm_ \
+  grep '^[ ]*chroot' "../$0" \
+    && { nonroot_has_perm_ \
            || skip_ "user $NON_ROOT_USERNAME lacks execute permissions"; }
 }