# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 1429177009 14400
# Node ID 7d0421de8de3188d85e58cf7fe10a5b90daad179
# Parent  89c5881d692caec161bd5f6d387d3a943d0eacbe
hooks: add a 'txnabort' hook

This hook will be called whenever a transaction is aborted. This will make it
easy for people to clean up temporary content they may have created during a
transaction.

diff --git a/mercurial/help/config.txt b/mercurial/help/config.txt
--- a/mercurial/help/config.txt
+++ b/mercurial/help/config.txt
@@ -833,6 +833,10 @@
   after the lock is released. see ``pretxnclose`` docs for details about
   available variables.
 
+``txnabort``
+  Run when a transaction is aborted. see ``pretxnclose`` docs for details about
+  available variables.
+
 ``pretxnchangegroup``
   Run after a changegroup has been added via push, pull or unbundle,
   but before the transaction has been committed. Changegroup is
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -975,6 +975,12 @@
                                **tr2.hookargs)
             reporef()._afterlock(hook)
         tr.addfinalize('txnclose-hook', txnclosehook)
+        def txnaborthook(tr2):
+            """To be run if transaction is aborted
+            """
+            reporef().hook('txnabort', throw=False, txnname=desc,
+                           **tr2.hookargs)
+        tr.addabort('txnabort-hook', txnaborthook)
         self._transref = weakref.ref(tr)
         return tr
 
diff --git a/tests/test-hook.t b/tests/test-hook.t
--- a/tests/test-hook.t
+++ b/tests/test-hook.t
@@ -15,6 +15,7 @@
   > pretxnopen = sh -c "HG_LOCAL= HG_TAG= python \"$TESTDIR/printenv.py\" pretxnopen"
   > pretxnclose = sh -c "HG_LOCAL= HG_TAG= python \"$TESTDIR/printenv.py\" pretxnclose"
   > txnclose = sh -c "HG_LOCAL= HG_TAG= python \"$TESTDIR/printenv.py\" txnclose"
+  > txnabort = sh -c "HG_LOCAL= HG_TAG= python \"$TESTDIR/printenv.py\" txnabort"
   > EOF
   $ echo a > a
   $ hg add a
@@ -161,6 +162,7 @@
   5:6f611f8018c1
   pretxncommit.forbid hook: HG_NODE=6f611f8018c10e827fee6bd2bc807f937e761567 HG_PARENT1=539e4b31b6dc99b3cfbaa6b53cbc1c1f9a1e3a10 HG_PENDING=$TESTTMP/a
   transaction abort!
+  txnabort hook: HG_TXNID=TXN:* HG_TXNNAME=commit (glob)
   rollback completed
   abort: pretxncommit.forbid1 hook exited with status 1
   [255]