1 files changed, 164 insertions, 0 deletions
diff --git a/meta/classes-global/devshell.bbclass b/meta/classes-global/devshell.bbclass
new file mode 100644
index 0000000000..4c23049cf0
--- /dev/null
+++ b/meta/classes-global/devshell.bbclass
@@ -0,0 +1,164 @@
+#
+# Copyright OpenEmbedded Contributors
+#
+# SPDX-License-Identifier: MIT
+#
+
+inherit terminal
+
+DEVSHELL = "${SHELL}"
+
+python do_devshell () {
+    if d.getVarFlag("do_devshell", "manualfakeroot"):
+       d.prependVar("DEVSHELL", "pseudo ")
+       fakeenv = d.getVar("FAKEROOTENV").split()
+       for f in fakeenv:
+            k = f.split("=")
+            d.setVar(k[0], k[1])
+            d.appendVar("OE_TERMINAL_EXPORTS", " " + k[0])
+       d.delVarFlag("do_devshell", "fakeroot")
+
+    oe_terminal(d.getVar('DEVSHELL'), 'OpenEmbedded Developer Shell', d)
+}
+
+addtask devshell after do_patch do_prepare_recipe_sysroot
+
+# The directory that the terminal starts in
+DEVSHELL_STARTDIR ?= "${S}"
+do_devshell[dirs] = "${DEVSHELL_STARTDIR}"
+do_devshell[nostamp] = "1"
+do_devshell[network] = "1"
+
+# devshell and fakeroot/pseudo need careful handling since only the final
+# command should run under fakeroot emulation, any X connection should
+# be done as the normal user. We therfore carefully construct the envionment
+# manually
+python () {
+    if d.getVarFlag("do_devshell", "fakeroot"):
+       # We need to signal our code that we want fakeroot however we
+       # can't manipulate the environment and variables here yet (see YOCTO #4795)
+       d.setVarFlag("do_devshell", "manualfakeroot", "1")
+       d.delVarFlag("do_devshell", "fakeroot")
+} 
+
+def pydevshell(d):
+
+    import code
+    import select
+    import signal
+    import termios
+
+    m, s = os.openpty()
+    sname = os.ttyname(s)
+
+    def noechoicanon(fd):
+        old = termios.tcgetattr(fd)
+        old[3] = old[3] &~ termios.ECHO &~ termios.ICANON
+        # &~ termios.ISIG
+        termios.tcsetattr(fd, termios.TCSADRAIN, old)
+
+    # No echo or buffering over the pty
+    noechoicanon(s)
+
+    pid = os.fork()
+    if pid:
+        os.close(m)
+        oe_terminal("oepydevshell-internal.py %s %d" % (sname, pid), 'OpenEmbedded Developer PyShell', d)
+        os._exit(0)
+    else:
+        os.close(s)
+
+        os.dup2(m, sys.stdin.fileno())
+        os.dup2(m, sys.stdout.fileno())
+        os.dup2(m, sys.stderr.fileno())
+
+        bb.utils.nonblockingfd(sys.stdout)
+        bb.utils.nonblockingfd(sys.stderr)
+        bb.utils.nonblockingfd(sys.stdin)
+
+        _context = {
+            "os": os,
+            "bb": bb,
+            "time": time,
+            "d": d,
+        }
+
+        ps1 = "pydevshell> "
+        ps2 = "... "
+        buf = []
+        more = False
+
+        i = code.InteractiveInterpreter(locals=_context)
+        print("OE PyShell (PN = %s)\n" % d.getVar("PN"))
+
+        def prompt(more):
+            if more:
+                prompt = ps2
+            else:
+                prompt = ps1
+            sys.stdout.write(prompt)
+            sys.stdout.flush()
+
+        # Restore Ctrl+C since bitbake masks this
+        def signal_handler(signal, frame):
+            raise KeyboardInterrupt
+        signal.signal(signal.SIGINT, signal_handler)
+
+        child = None
+
+        prompt(more)
+        while True:
+            try:
+                try:
+                    (r, _, _) = select.select([sys.stdin], [], [], 1)
+                    if not r:
+                        continue
+                    line = sys.stdin.readline().strip()
+                    if not line:
+                        prompt(more)
+                        continue
+                except EOFError as e:
+                    sys.stdout.write("\n")
+                    sys.stdout.flush()
+                except (OSError, IOError) as e:
+                    if e.errno == 11:
+                        continue
+                    if e.errno == 5:
+                        return
+                    raise
+                else:
+                    if not child:
+                        child = int(line)
+                        continue
+                    buf.append(line)
+                    source = "\n".join(buf)
+                    more = i.runsource(source, "<pyshell>")
+                    if not more:
+                        buf = []
+                    sys.stderr.flush()
+                    prompt(more)
+            except KeyboardInterrupt:
+                i.write("\nKeyboardInterrupt\n")
+                buf = []
+                more = False
+                prompt(more)
+            except SystemExit:
+                # Easiest way to ensure everything exits
+                os.kill(child, signal.SIGTERM)
+                break
+
+python do_pydevshell() {
+    import signal
+
+    try:
+        pydevshell(d)
+    except SystemExit:
+        # Stop the SIGTERM above causing an error exit code
+        return
+    finally:
+        return
+}
+addtask pydevshell after do_patch
+
+do_pydevshell[nostamp] = "1"
+do_pydevshell[network] = "1"