localrepo: use correct argument name for pretxnclose hooks (BC)

Before this patch, "the reason for the transaction" is passed to
`pretxnclose` hooks via wrong name argument `xnname` (`HG_XNNAME` for
external hooks)

mercurial/localrepo.py

@@ -975,7 +975,7 b' class localrepository(object):'
             """will run pre-closing hooks"""
             pending = lambda: tr.writepending() and self.root or ""
             reporef().hook('pretxnclose', throw=True, pending=pending,
-                           xnname=desc, **tr.hookargs)
+                           txnname=desc, **tr.hookargs)
 
         tr = transaction.transaction(rp, self.sopener, vfsmap,
                                      "journal",

tests/test-hook.t

@@ -32,7 +32,7 b' commit hooks can see env vars'
   pretxnopen hook: HG_TXNNAME=commit
   pretxncommit hook: HG_NODE=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b HG_PARENT1=0000000000000000000000000000000000000000 HG_PENDING=$TESTTMP/a
   0:cb9a9f314b8b
-  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_PHASES_MOVED=1 HG_TXNID=TXN:* HG_XNNAME=commit (glob)
+  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_PHASES_MOVED=1 HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   txnclose hook: HG_PHASES_MOVED=1 HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   commit hook: HG_NODE=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b HG_PARENT1=0000000000000000000000000000000000000000
   commit.b hook: HG_NODE=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b HG_PARENT1=0000000000000000000000000000000000000000
@@ -60,7 +60,7 b' pretxncommit and commit hooks can see bo'
   pretxnopen hook: HG_TXNNAME=commit
   pretxncommit hook: HG_NODE=ab228980c14deea8b9555d91c9581127383e40fd HG_PARENT1=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b HG_PENDING=$TESTTMP/a
   1:ab228980c14d
-  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_XNNAME=commit (glob)
+  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   txnclose hook: HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   commit hook: HG_NODE=ab228980c14deea8b9555d91c9581127383e40fd HG_PARENT1=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b
   commit.b hook: HG_NODE=ab228980c14deea8b9555d91c9581127383e40fd HG_PARENT1=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b
@@ -73,7 +73,7 b' pretxncommit and commit hooks can see bo'
   pretxnopen hook: HG_TXNNAME=commit
   pretxncommit hook: HG_NODE=ee9deb46ab31e4cc3310f3cf0c3d668e4d8fffc2 HG_PARENT1=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b HG_PENDING=$TESTTMP/a
   2:ee9deb46ab31
-  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_XNNAME=commit (glob)
+  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   txnclose hook: HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   commit hook: HG_NODE=ee9deb46ab31e4cc3310f3cf0c3d668e4d8fffc2 HG_PARENT1=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b
   commit.b hook: HG_NODE=ee9deb46ab31e4cc3310f3cf0c3d668e4d8fffc2 HG_PARENT1=cb9a9f314b8b07ba71012fcdbc544b5a4d82ff5b
@@ -86,7 +86,7 b' pretxncommit and commit hooks can see bo'
   pretxnopen hook: HG_TXNNAME=commit
   pretxncommit hook: HG_NODE=07f3376c1e655977439df2a814e3cc14b27abac2 HG_PARENT1=ee9deb46ab31e4cc3310f3cf0c3d668e4d8fffc2 HG_PARENT2=ab228980c14deea8b9555d91c9581127383e40fd HG_PENDING=$TESTTMP/a
   3:07f3376c1e65
-  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_XNNAME=commit (glob)
+  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   txnclose hook: HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   commit hook: HG_NODE=07f3376c1e655977439df2a814e3cc14b27abac2 HG_PARENT1=ee9deb46ab31e4cc3310f3cf0c3d668e4d8fffc2 HG_PARENT2=ab228980c14deea8b9555d91c9581127383e40fd
   commit.b hook: HG_NODE=07f3376c1e655977439df2a814e3cc14b27abac2 HG_PARENT1=ee9deb46ab31e4cc3310f3cf0c3d668e4d8fffc2 HG_PARENT2=ab228980c14deea8b9555d91c9581127383e40fd
@@ -130,7 +130,7 b' tag hooks can see env vars'
   pretxnopen hook: HG_TXNNAME=commit
   pretxncommit hook: HG_NODE=539e4b31b6dc99b3cfbaa6b53cbc1c1f9a1e3a10 HG_PARENT1=07f3376c1e655977439df2a814e3cc14b27abac2 HG_PENDING=$TESTTMP/a
   4:539e4b31b6dc
-  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_XNNAME=commit (glob)
+  pretxnclose hook: HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   tag hook: HG_LOCAL=0 HG_NODE=07f3376c1e655977439df2a814e3cc14b27abac2 HG_TAG=a
   txnclose hook: HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   commit hook: HG_NODE=539e4b31b6dc99b3cfbaa6b53cbc1c1f9a1e3a10 HG_PARENT1=07f3376c1e655977439df2a814e3cc14b27abac2
@@ -229,7 +229,7 b' pushkey hook'
   searching for changes
   no changes found
   pretxnopen hook: HG_TXNNAME=bookmarks
-  pretxnclose hook: HG_BOOKMARK_MOVED=1 HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_XNNAME=bookmarks (glob)
+  pretxnclose hook: HG_BOOKMARK_MOVED=1 HG_PENDING=$TESTTMP/a HG_TXNID=TXN:* HG_TXNNAME=bookmarks (glob)
   txnclose hook: HG_BOOKMARK_MOVED=1 HG_TXNID=TXN:* HG_TXNNAME=bookmarks (glob)
   pushkey hook: HG_KEY=foo HG_NAMESPACE=bookmarks HG_NEW=0000000000000000000000000000000000000000 HG_RET=1
   exporting bookmark foo