More robustly unspoof HOME in Eglot tests (bug#61637)

A fair number of LSP servers allow user-local installations instead of
system wide installations.  Emacs's technique of spoofing the HOME env
var to some non-existent or non-home directory during 'make check'
breaks these tests.  That's because the executables are still found by
executable-find, but their invocation will rarely be successful as
HOME isn't what they expect it to be.

Eglot tests already had a technique for dealing with this,
"unspoffing" HOME just for the invocations of LSP server but it
stopped working a while back.  So make it more robust.

Eventually, we'll want to decide wether these local servers should be
considered in 'make check' runs at all, or whether there is a way to
use them with a spoofed HOME.

* test/lisp/progmodes/eglot-tests.el (eglot--call-with-fixture):
More robustly unspoof HOME.

1 files changed, 8 insertions, 9 deletions

diff --git a/test/lisp/progmodes/eglot-tests.el b/test/lisp/progmodes/eglot-tests.el
index 5d5de59a19a..7a90d68d213 100644
--- a/test/lisp/progmodes/eglot-tests.el
+++ b/test/lisp/progmodes/eglot-tests.el
@@ -103,22 +103,21 @@ then restored."
              (set (car spec) (cadr spec)))
             ((stringp (car spec)) (push spec file-specs))))
     (unwind-protect
-        (let* ((home (getenv "HOME"))
-               (process-environment
+        (let* ((process-environment
                 (append
                  `(;; Set XDF_CONFIG_HOME to /dev/null to prevent
                    ;; user-configuration to have an influence on
                    ;; language servers. (See github#441)
                    "XDG_CONFIG_HOME=/dev/null"
                    ;; ... on the flip-side, a similar technique by
-                   ;; Emacs's test makefiles means that HOME is set to
-                   ;; /nonexistent.  This breaks some common
-                   ;; installations for LSP servers like pylsp, making
-                   ;; these tests mostly useless, so we hack around it
-                   ;; here with a great big hack.
+                   ;; Emacs's test makefiles means that HOME is
+                   ;; spoofed to /nonexistent, or sometimes /tmp.
+                   ;; This breaks some common installations for LSP
+                   ;; servers like pylsp, rust-analyzer making these
+                   ;; tests mostly useless, so we hack around it here
+                   ;; with a great big hack.
                    ,(format "HOME=%s"
-                            (if (file-exists-p home) home
-                              (format "/home/%s" (getenv "USER")))))
+                            (expand-file-name (format "~%s" (user-login-name)))))
                  process-environment))
                ;; Prevent "Can't guess python-indent-offset ..." messages.
                (python-indent-guess-indent-offset-verbose . nil)