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downgradedatabase: adding special case for MDB

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Though this script was initially written for undoing GUID indexing on
TDB databases, we're repurposing it to do a full downgrade of any
database. MDB databases can't be DN indexed, but they can have pack
format version 2 and ORDERED_INTEGER data types, which must be removed
during a downgrade.

Signed-off-by: Aaron Haslett <aaronhaslett@catalyst.net.nz>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
This commit is contained in:
Aaron Haslett 2019-05-23 20:06:56 +12:00 committed by Andrew Bartlett
parent 4eee09a2c1
commit 0942a65b63
1 changed files with 27 additions and 2 deletions
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29
source4/scripting/bin/sambadowngradedatabase
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@ -27,7 +27,6 @@ if len(args) != 0:
sys.exit(1)
lp_ctx = sambaopts.get_loadparm()
lp_ctx.set("dsdb:guid index", "false")
if opts.H is None:
url = lp_ctx.private_path("sam.ldb")
@ -40,7 +39,33 @@ samdb = ldb.Ldb(url=url,
partitions = samdb.search(base="@PARTITION",
scope=ldb.SCOPE_BASE,
attrs=["partition"])
attrs=["backendStore", "partition"])
backend = str(partitions[0].get('backendStore', 'tdb'))
if backend == "mdb":
samdb = None
options = ["pack_format_override=%d" % ldb.PACKING_FORMAT]
# We can't remove GUID indexes from LMDB in case there are very
# long DNs, so we just move down the pack format, which also removes
# references to ORDERED_INTEGER in @ATTRIBUTES.
# Reopen the DB with pack_format_override set
samdb = SamDB(url=url,
flags=ldb.FLG_DONT_CREATE_DB,
lp=lp_ctx,
options=options)
samdb.transaction_start()
samdb.transaction_commit()
print("Your database has been downgraded to LDB pack format version %0x (v1)." % ldb.PACKING_FORMAT)
print("NOTE: Any use of a Samba 4.11 tool that modifies the DB will "
"auto-upgrade back to pack format version %0x (v2)" %
ldb.PACKING_FORMAT_V2)
exit(0);
# This is needed to force the @ATTRIBUTES and @INDEXLIST to be correct
lp_ctx.set("dsdb:guid index", "false")
modmsg = ldb.Message()
modmsg.dn = ldb.Dn(samdb, '@INDEXLIST')