fixes #10273 execShellCmd now returns nonzero when child killed with signal + other fixes (#10274)

* s/exitStatus(...)/exitStatusLikeShell(...)/
* fix #10273 execShellCmd now returns nonzero when child exits with signal
* test case for #10249 and explanation for the bug
* fix test failure
* add tests/nim.cfg

lib/pure/os.nim

@@ -1287,6 +1287,17 @@ proc moveFile*(source, dest: string) {.rtl, extern: "nos$1",
         discard tryRemoveFile(dest)
         raise
 
+proc exitStatusLikeShell*(status: cint): cint =
+  ## converts exit code from `c_system` into a shell exit code
+  when defined(posix) and not weirdTarget:
+    if WIFSIGNALED(status):
+      # like the shell!
+      128 + WTERMSIG(status)
+    else:
+      WEXITSTATUS(status)
+  else:
+    status
+
 proc execShellCmd*(command: string): int {.rtl, extern: "nos$1",
   tags: [ExecIOEffect], noNimScript.} =
   ## Executes a `shell command`:idx:.
@@ -1295,14 +1306,8 @@ proc execShellCmd*(command: string): int {.rtl, extern: "nos$1",
   ## line arguments given to program. The proc returns the error code
   ## of the shell when it has finished. The proc does not return until
   ## the process has finished. To execute a program without having a
-  ## shell involved, use the `execProcess` proc of the `osproc`
-  ## module.
-  when defined(macosx):
-    result = c_system(command) shr 8
-  elif defined(posix):
-    result = WEXITSTATUS(c_system(command))
-  else:
-    result = c_system(command)
+  ## shell involved, use `osproc.execProcess`.
+  result = exitStatusLikeShell(c_system(command))
 
 # Templates for filtering directories and files
 when defined(windows) and not weirdTarget:

lib/pure/osproc.nim

@@ -724,13 +724,6 @@ elif not defined(useNimRtl):
   proc isExitStatus(status: cint): bool =
     WIFEXITED(status) or WIFSIGNALED(status)
 
-  proc exitStatus(status: cint): cint =
-    if WIFSIGNALED(status):
-      # like the shell!
-      128 + WTERMSIG(status)
-    else:
-      WEXITSTATUS(status)
-
   proc envToCStringArray(t: StringTableRef): cstringArray =
     result = cast[cstringArray](alloc0((t.len + 1) * sizeof(cstring)))
     var i = 0
@@ -1054,7 +1047,7 @@ elif not defined(useNimRtl):
 
     proc waitForExit(p: Process, timeout: int = -1): int =
       if p.exitFlag:
-        return exitStatus(p.exitStatus)
+        return exitStatusLikeShell(p.exitStatus)
 
       if timeout == -1:
         var status: cint = 1
@@ -1109,7 +1102,7 @@ elif not defined(useNimRtl):
         finally:
           discard posix.close(kqFD)
 
-      result = exitStatus(p.exitStatus)
+      result = exitStatusLikeShell(p.exitStatus)
   else:
     import times
 
@@ -1142,7 +1135,7 @@ elif not defined(useNimRtl):
         s.tv_nsec = b.tv_nsec
 
       if p.exitFlag:
-        return exitStatus(p.exitStatus)
+        return exitStatusLikeShell(p.exitStatus)
 
       if timeout == -1:
         var status: cint = 1
@@ -1220,20 +1213,20 @@ elif not defined(useNimRtl):
             if sigprocmask(SIG_UNBLOCK, nmask, omask) == -1:
               raiseOSError(osLastError())
 
-      result = exitStatus(p.exitStatus)
+      result = exitStatusLikeShell(p.exitStatus)
 
   proc peekExitCode(p: Process): int =
     var status = cint(0)
     result = -1
     if p.exitFlag:
-      return exitStatus(p.exitStatus)
+      return exitStatusLikeShell(p.exitStatus)
 
     var ret = waitpid(p.id, status, WNOHANG)
     if ret > 0:
       if isExitStatus(status):
         p.exitFlag = true
         p.exitStatus = status
-        result = exitStatus(status)
+        result = exitStatusLikeShell(status)
 
   proc createStream(stream: var Stream, handle: var FileHandle,
                     fileMode: FileMode) =
@@ -1265,7 +1258,7 @@ elif not defined(useNimRtl):
   proc execCmd(command: string): int =
     when defined(linux):
       let tmp = csystem(command)
-      result = if tmp == -1: tmp else: exitStatus(tmp)
+      result = if tmp == -1: tmp else: exitStatusLikeShell(tmp)
     else:
       result = csystem(command)