# HG changeset patch
# User FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
# Date 1487607660 -32400
# Node ID 59e69ed81776f0186cb6e6c69f8d7659afab26b7
# Parent  6afd8a87a6575fb253d74965e14dd256b44b1279
localrepo: check HG_PENDING strictly

Before this patch, checking HG_PENDING for changelog in localrepo.py
might cause unintentional reading unrelated '00changelog.i.a' in,
because HG_PENDING is checked by str.startswith().

An external hook spawned by inner repository in nested ones satisfies
this condition.

This patch uses txnutil.mayhavepending() to check HG_PENDING strictly.

BTW, this patch may cause failure of bisect in the repository of
Mercurial itself, if examination at bisecting assumes that an external
hook can see all pending changes while nested transactions across
repositories.

This invisibility issue will be fixed by subsequent patch, which
allows HG_PENDING to refer multiple repositories.

diff -r 6afd8a87a657 -r 59e69ed81776 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Tue Feb 21 01:21:00 2017 +0900
+++ b/mercurial/localrepo.py	Tue Feb 21 01:21:00 2017 +0900
@@ -56,6 +56,7 @@
     subrepo,
     tags as tagsmod,
     transaction,
+    txnutil,
     util,
 )
 
@@ -513,10 +514,8 @@
     @storecache('00changelog.i')
     def changelog(self):
         c = changelog.changelog(self.svfs)
-        if 'HG_PENDING' in encoding.environ:
-            p = encoding.environ['HG_PENDING']
-            if p.startswith(self.root):
-                c.readpending('00changelog.i.a')
+        if txnutil.mayhavepending(self.root):
+            c.readpending('00changelog.i.a')
         return c
 
     def _constructmanifest(self):
diff -r 6afd8a87a657 -r 59e69ed81776 tests/test-hook.t
--- a/tests/test-hook.t	Tue Feb 21 01:21:00 2017 +0900
+++ b/tests/test-hook.t	Tue Feb 21 01:21:00 2017 +0900
@@ -832,6 +832,50 @@
   [1]
   $ cd ..
 
+check whether HG_PENDING makes pending changes only in related
+repositories visible to an external hook.
+
+(emulate a transaction running concurrently by copied
+.hg/store/00changelog.i.a in subsequent test)
+
+  $ cat > $TESTTMP/savepending.sh <<EOF
+  > cp .hg/store/00changelog.i.a  .hg/store/00changelog.i.a.saved
+  > exit 1 # to avoid adding new revision for subsequent tests
+  > EOF
+  $ cd a
+  $ hg tip -q
+  4:539e4b31b6dc
+  $ hg --config hooks.pretxnclose="sh $TESTTMP/savepending.sh" commit -m "invisible"
+  transaction abort!
+  rollback completed
+  abort: pretxnclose hook exited with status 1
+  [255]
+  $ cp .hg/store/00changelog.i.a.saved .hg/store/00changelog.i.a
+
+(check (in)visibility of new changeset while transaction running in
+repo)
+
+  $ cat > $TESTTMP/checkpending.sh <<EOF
+  > echo '@a'
+  > hg -R $TESTTMP/a tip -q
+  > echo '@a/nested'
+  > hg -R $TESTTMP/a/nested tip -q
+  > exit 1 # to avoid adding new revision for subsequent tests
+  > EOF
+  $ hg init nested
+  $ cd nested
+  $ echo a > a
+  $ hg add a
+  $ hg --config hooks.pretxnclose="sh $TESTTMP/checkpending.sh" commit -m '#0'
+  @a
+  4:539e4b31b6dc
+  @a/nested
+  0:bf5e395ced2c
+  transaction abort!
+  rollback completed
+  abort: pretxnclose hook exited with status 1
+  [255]
+
 Hook from untrusted hgrc are reported as failure
 ================================================