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pySim-shell: add new commandline option "--pure"

by default pySim-shell does all kinds of probing and file selection
on startup. This is to determine the card type and to find a suitable
card profile. However, in case the card is non yet provisioned this
probing may cause a error messages and even might upset the cards
internal state. So let's have a commandline option thrugh which we
can instruct pySim-shell to skip any initialization and to give us
a prompt immediately, so that we can enter custom APDUs

Related: OS#6367
Change-Id: I1d8a57de201fe7ad7cbcbc6f72969ea8521e821d
---
M pySim-shell.py
M pySim/app.py
M pySim/cards.py
3 files changed, 12 insertions(+), 3 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/08/38608/1

diff --git a/pySim-shell.py b/pySim-shell.py
index 413d3f7..7e59cdf 100755
--- a/pySim-shell.py
+++ b/pySim-shell.py
@@ -1060,6 +1060,8 @@
                           help="Use automatic card handling machine")
 global_group.add_argument("--noprompt", help="Run in non interactive mode",
                           action='store_true', default=False)
+global_group.add_argument("--pure", help="Skip all card/profile initialization",
+                          action='store_true', default=False)
 
 adm_group = global_group.add_mutually_exclusive_group()
 adm_group.add_argument('-a', '--pin-adm', metavar='PIN_ADM1', dest='pin_adm', default=None,
@@ -1105,7 +1107,7 @@
     # is no card in the reader or the card is unresponsive. PysimApp is
     # able to tolerate and recover from that.
     try:
-        rs, card = init_card(sl)
+        rs, card = init_card(sl, opts.pure)
         app = PysimApp(card, rs, sl, ch)
     except:
         startup_errors = True
diff --git a/pySim/app.py b/pySim/app.py
index 5a93f98..d8087aa 100644
--- a/pySim/app.py
+++ b/pySim/app.py
@@ -19,7 +19,7 @@
 from pySim.transport import LinkBase
 from pySim.commands import SimCardCommands
 from pySim.filesystem import CardModel, CardApplication
-from pySim.cards import card_detect, SimCardBase, UiccCardBase
+from pySim.cards import card_detect, SimCardBase, UiccCardBase, CardBase
 from pySim.runtime import RuntimeState
 from pySim.profile import CardProfile
 from pySim.cdma_ruim import CardProfileRUIM
@@ -42,7 +42,7 @@
 import pySim.global_platform
 import pySim.euicc
 
-def init_card(sl: LinkBase) -> Tuple[RuntimeState, SimCardBase]:
+def init_card(sl: LinkBase, pure: bool = False) -> Tuple[RuntimeState, SimCardBase]:
     """
     Detect card in reader and setup card profile and runtime state. This
     function must be called at least once on startup. The card and runtime
@@ -57,6 +57,12 @@
     print("Waiting for card...")
     sl.wait_for_card(3)
 
+    # The user may opt to skip all card initialization. In this case only the
+    # most basic card profile is selected. This mode is suitable for blank
+    # cards that need card O/S initialization using APDU scripts first.
+    if pure:
+        return None, CardBase(scc)
+
     generic_card = False
     card = card_detect(scc)
     if card is None:
diff --git a/pySim/cards.py b/pySim/cards.py
index b7958f4..b0d8312 100644
--- a/pySim/cards.py
+++ b/pySim/cards.py
@@ -168,6 +168,7 @@
         return (None, None)
 
 def card_detect(scc: SimCardCommands) -> Optional[CardBase]:
+
     # UICC always has higher preference, as a UICC might also contain a SIM application
     uicc = UiccCardBase(scc)
     if uicc.probe():

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