transaction: the base of a new test file checking transaction abort issue stable

transaction: the base of a new test file checking transaction abort issue

See inline documentation for details. See other changesets for actual cases.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-transaction-wc-rollback-race.t	Wed Feb 22 18:03:18 2023 +0100
@@ -0,0 +1,139 @@
+=======================================================================
+Check potential race condition around transaction and working copy data
+=======================================================================
+
+#testcases bookmarks-in-store bookmarks-wc-level
+
+The transaction is garanteed to run with the lock, but may runs without the
+wlock. So if the transaction backup/restore some content related to the
+working-copy and protected by the wlock, we might run into trouble if another
+process grab the wlock and modify them.
+
+This test file is testing various cases where such parallel changes happens to
+validate the transaction behavior.
+
+Other is used to get a simple pull source. As pull is a simple way to create
+transaction without the wlock.
+
+Setup
+=====
+
+Avoid long deadlock
+
+  $ cat << EOF >> $HGRCPATH
+  > [ui]
+  > timeout=10
+  > EOF
+
+#if bookmarks-in-store
+  $ cat << EOF >> $HGRCPATH
+  > [format]
+  > bookmarks-in-store = yes
+  > EOF
+#endif
+
+
+  $ hg init repo
+  $ cd repo
+  $ for filename in a b c d e f g h i j k l m; do
+  >     echo $filename > default_$filename
+  >     hg add default_$filename
+  >     hg commit --quiet --message default_$filename
+  > done
+  $ hg bookmark --rev . foo
+  $ hg branch babar
+  marked working directory as branch babar
+  (branches are permanent and global, did you want a bookmark?)
+  $ for filename in a b c d e f g h i j k l m; do
+  >     echo $filename > babar_$filename
+  >     hg add babar_$filename
+  >     hg commit --quiet --message babar_$filename
+  > done
+  $ hg bookmark --rev . bar
+  $ hg up 'desc("default_m")'
+  0 files updated, 0 files merged, 13 files removed, 0 files unresolved
+  $ hg log -G -T '[{branch}] ({bookmarks}) {desc}\n'
+  o  [babar] (bar) babar_m
+  |
+  o  [babar] () babar_l
+  |
+  o  [babar] () babar_k
+  |
+  o  [babar] () babar_j
+  |
+  o  [babar] () babar_i
+  |
+  o  [babar] () babar_h
+  |
+  o  [babar] () babar_g
+  |
+  o  [babar] () babar_f
+  |
+  o  [babar] () babar_e
+  |
+  o  [babar] () babar_d
+  |
+  o  [babar] () babar_c
+  |
+  o  [babar] () babar_b
+  |
+  o  [babar] () babar_a
+  |
+  @  [default] (foo) default_m
+  |
+  o  [default] () default_l
+  |
+  o  [default] () default_k
+  |
+  o  [default] () default_j
+  |
+  o  [default] () default_i
+  |
+  o  [default] () default_h
+  |
+  o  [default] () default_g
+  |
+  o  [default] () default_f
+  |
+  o  [default] () default_e
+  |
+  o  [default] () default_d
+  |
+  o  [default] () default_c
+  |
+  o  [default] () default_b
+  |
+  o  [default] () default_a
+  
+
+  $ cat << EOF >> ../txn-close.sh
+  > rm -f $TESTTMP/transaction-continue
+  > $RUNTESTDIR/testlib/wait-on-file 5 $TESTTMP/transaction-continue $TESTTMP/transaction-waiting
+  > rm -f $TESTTMP/transaction-waiting
+  > exit 1
+  > EOF
+  $ cat << EOF >> .hg/hgrc
+  > [hooks]
+  > pretxnclose.test = sh $TESTTMP/txn-close.sh
+  > EOF
+
+Check the overall logic is working, the transaction is holding the `lock` , but
+not the `wlock`, then get aborted on a signal-file.
+
+  $ hg phase --rev 0
+  0: draft
+  $ hg phase --public --rev 0 2> ../log.err &
+  $ $RUNTESTDIR/testlib/wait-on-file 5 $TESTTMP/transaction-waiting
+  $ echo y | hg --config ui.interactive=yes debuglock --set-wlock
+  ready to release the lock (y)?  y
+  $ echo y | hg --config ui.interactive=yes debuglock --set-lock
+  abort: lock is already held
+  [255]
+  $ touch $TESTTMP/transaction-continue
+  $ wait
+  $ hg phase --rev 0
+  0: draft
+  $ cat ../log.err
+  transaction abort!
+  rollback completed
+  abort: pretxnclose.test hook exited with status 1