[OE-core] [PATCH] devshell.bbclass: Allow running devshell and fakeroot together

[Richard Purdie]

Currently its hard to run a devshell complete with fakeroot context. This
patch allows the fakeroot flag on the task to do this, as with any other
task. Since we may need to start X terminal applications, we need to
only start the fakeroot session on the final command, hence the hoops
this code jumps through.

As always with fakeroot, you can break out and run a command without
the fake permissions with syntax like "PSEUDO_UNLOAD=1 <command>"

[YOCTO #3374]

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
 meta/classes/devshell.bbclass |   19 ++++++++++++++++++-
 meta/classes/terminal.bbclass |    5 +++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/meta/classes/devshell.bbclass b/meta/classes/devshell.bbclass
index ddb6e55..a780118 100644
--- a/meta/classes/devshell.bbclass
+++ b/meta/classes/devshell.bbclass
@@ -1,10 +1,27 @@
 inherit terminal
 
+DEVSHELL = "${SHELL}"
+
 python do_devshell () {
-    oe_terminal(d.getVar('SHELL', True), 'OpenEmbedded Developer Shell', d)
+    oe_terminal(d.getVar('DEVSHELL', True), 'OpenEmbedded Developer Shell', d)
 }
 
 addtask devshell after do_patch
 
 do_devshell[dirs] = "${S}"
 do_devshell[nostamp] = "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"):
+       d.prependVar("DEVSHELL", "pseudo ")
+       fakeenv = d.getVar("FAKEROOTENV", True).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")
+} 
diff --git a/meta/classes/terminal.bbclass b/meta/classes/terminal.bbclass
index d5a6277..8cebad4 100644
--- a/meta/classes/terminal.bbclass
+++ b/meta/classes/terminal.bbclass
@@ -25,6 +25,11 @@ def oe_terminal(command, title, d):
         if value is not None:
             os.environ[export] = str(value)
             env[export] = str(value)
+        if export == "PSEUDO_DISABLED":
+            if "PSEUDO_UNLOAD" in os.environ:
+                del os.environ["PSEUDO_UNLOAD"]
+            if "PSEUDO_UNLOAD" in env:
+                del env["PSEUDO_UNLOAD"]
 
     # Add in all variables from the user's original environment which
     # haven't subsequntly been set/changed