tests/test-dirstate-race.t
author Sandu Turcan <idlsoft@gmail.com>
Tue, 03 May 2022 21:44:30 -0400
branchstable
changeset 49241 6b10151b9621
parent 48681 e845537f6adb
permissions -rw-r--r--
narrow_widen_acl: enforce narrowacl in narrow_widen (SEC) Reviewer note: this was sent by the author as a simple bugfix, but can be considered a security patch, since it allows users to access things outside of the ACL, hence the (SEC) prefix. However, this affects the `narrow` extention which is still marked as experimental and has relatively few users aside from large companies with their own security layers on top from what we can gather. We feel (Alphare: or at least, I feel) like pinging the packaging list is enough in this case.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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#testcases dirstate-v1 dirstate-v2
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#if dirstate-v2
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  $ cat >> $HGRCPATH << EOF
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  > [format]
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  > use-dirstate-v2=1
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  > [storage]
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  > dirstate-v2.slow-path=allow
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  > EOF
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#endif
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  $ hg init repo
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  $ cd repo
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  $ echo a > a
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  $ hg add a
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  $ hg commit -m test
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Do we ever miss a sub-second change?:
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  $ for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do
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  >     hg update -qC 0
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  >     echo b > a
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  >     hg st
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  > done
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  M a
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  M a
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  M a
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  $ echo test > b
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  $ mkdir dir1
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  $ echo test > dir1/c
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  $ echo test > d
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  $ echo test > e
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#if execbit
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A directory will typically have the execute bit -- make sure it doesn't get
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confused with a file with the exec bit set
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  $ chmod +x e
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#endif
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  $ hg add b dir1 d e
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  adding dir1/c
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  $ hg commit -m test2
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  $ cat >> $TESTTMP/dirstaterace.py << EOF
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  > from mercurial import (
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  >     context,
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  >     extensions,
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  > )
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  > def extsetup(ui):
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  >     extensions.wrapfunction(context.workingctx, '_checklookup', overridechecklookup)
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  > def overridechecklookup(orig, self, *args, **kwargs):
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  >     # make an update that changes the dirstate from underneath
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  >     self._repo.ui.system(br"sh '$TESTTMP/dirstaterace.sh'",
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  >                          cwd=self._repo.root)
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  >     return orig(self, *args, **kwargs)
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  > EOF
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  $ hg debugrebuilddirstate
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  $ hg debugdirstate
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  n   0         -1 unset               a
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  n   0         -1 unset               b
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  n   0         -1 unset               d
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  n   0         -1 unset               dir1/c
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  n   0         -1 unset               e
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XXX Note that this returns M for files that got replaced by directories. This is
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definitely a bug, but the fix for that is hard and the next status run is fine
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anyway.
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  $ cat > $TESTTMP/dirstaterace.sh <<EOF
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  > rm b && rm -r dir1 && rm d && mkdir d && rm e && mkdir e
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  > EOF
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  $ sleep 1 # ensure non-ambiguous mtime
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  $ hg status --config extensions.dirstaterace=$TESTTMP/dirstaterace.py
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  M d
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  M e
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  ! b
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  ! dir1/c
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  $ hg debugdirstate
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  n 644          2 * a (glob)
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  n   0         -1 unset               b
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  n   0         -1 unset               d
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  n   0         -1 unset               dir1/c
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  n   0         -1 unset               e
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  $ hg status
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  ! b
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  ! d
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  ! dir1/c
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  ! e
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  $ rmdir d e
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  $ hg update -C -q .
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Test that dirstate changes aren't written out at the end of "hg
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status", if .hg/dirstate is already changed simultaneously before
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acquisition of wlock in workingctx._poststatusfixup().
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This avoidance is important to keep consistency of dirstate in race
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condition (see issue5584 for detail).
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  $ hg parents -q
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  1:* (glob)
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  $ hg debugrebuilddirstate
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  $ hg debugdirstate
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  n   0         -1 unset               a
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  n   0         -1 unset               b
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  n   0         -1 unset               d
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  n   0         -1 unset               dir1/c
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  n   0         -1 unset               e
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  $ cat > $TESTTMP/dirstaterace.sh <<EOF
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  > # This script assumes timetable of typical issue5584 case below:
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  > #
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  > # 1. "hg status" loads .hg/dirstate
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  > # 2. "hg status" confirms clean-ness of FILE
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  > # 3. "hg update -C 0" updates the working directory simultaneously
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  > #    (FILE is removed, and FILE is dropped from .hg/dirstate)
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  > # 4. "hg status" acquires wlock
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  > #    (.hg/dirstate is re-loaded = no FILE entry in dirstate)
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  > # 5. "hg status" marks FILE in dirstate as clean
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  > #    (FILE entry is added to in-memory dirstate)
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  > # 6. "hg status" writes dirstate changes into .hg/dirstate
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  > #    (FILE entry is written into .hg/dirstate)
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  > #
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  > # To reproduce similar situation easily and certainly, #2 and #3
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  > # are swapped.  "hg cat" below ensures #2 on "hg status" side.
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  > 
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  > hg update -q -C 0
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  > hg cat -r 1 b > b
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  > # make sure the timestamps is not ambiguous and a write will be issued
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  > touch -t 198606251012 b
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  > EOF
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"hg status" below should excludes "e", of which exec flag is set, for
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portability of test scenario, because unsure but missing "e" is
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treated differently in _checklookup() according to runtime platform.
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- "missing(!)" on POSIX, "pctx[f].cmp(self[f])" raises ENOENT
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- "modified(M)" on Windows, "self.flags(f) != pctx.flags(f)" is True
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  $ hg status --config extensions.dirstaterace=$TESTTMP/dirstaterace.py --debug -X path:e
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  skip updating dirstate: identity mismatch
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  M a
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  ! d
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  ! dir1/c
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  $ hg parents -q
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  0:* (glob)
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  $ hg files
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  a
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  $ hg debugdirstate
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  n * * * a (glob)
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  $ rm b
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32816
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#if fsmonitor
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Create fsmonitor state.
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  $ hg status
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  $ f --type .hg/fsmonitor.state
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  .hg/fsmonitor.state: file
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Test that invalidating fsmonitor state in the middle (which doesn't require the
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wlock) causes the fsmonitor update to be skipped.
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hg debugrebuilddirstate ensures that the dirstaterace hook will be called, but
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it also invalidates the fsmonitor state. So back it up and restore it.
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  $ mv .hg/fsmonitor.state .hg/fsmonitor.state.tmp
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  $ hg debugrebuilddirstate
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  $ mv .hg/fsmonitor.state.tmp .hg/fsmonitor.state
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  $ cat > $TESTTMP/dirstaterace.sh <<EOF
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  > rm .hg/fsmonitor.state
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  > EOF
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  $ hg status --config extensions.dirstaterace=$TESTTMP/dirstaterace.py --debug
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  skip updating fsmonitor.state: identity mismatch
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  $ f .hg/fsmonitor.state
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  .hg/fsmonitor.state: file not found
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#endif
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Set up a rebase situation for issue5581.
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  $ echo c2 > a
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  $ echo c2 > b
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  $ hg add b
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  $ hg commit -m c2
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  created new head
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  $ echo c3 >> a
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  $ hg commit -m c3
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  $ hg update 2
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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
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  $ echo c4 >> a
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  $ echo c4 >> b
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  $ hg commit -m c4
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  created new head
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33577
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Configure a merge tool that runs status in the middle of the rebase. The goal of
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the status call is to trigger a potential bug if fsmonitor's state is written
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even though the wlock is held by another process. The output of 'hg status' in
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the merge tool goes to /dev/null because we're more interested in the results of
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'hg status' run after the rebase.
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  $ cat >> $TESTTMP/mergetool-race.sh << EOF
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  > echo "custom merge tool"
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  > printf "c2\nc3\nc4\n" > \$1
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  > hg --cwd "$TESTTMP/repo" status > /dev/null
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  > echo "custom merge tool end"
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  > EOF
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  $ cat >> $HGRCPATH << EOF
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  > [extensions]
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  > rebase =
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  > [merge-tools]
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  > test.executable=sh
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  > test.args=$TESTTMP/mergetool-race.sh \$output
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  > EOF
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  $ hg rebase -s . -d 3 --tool test
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f90a5c211251 rebase: change and standarize template for rebase's one-line summary
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  rebasing 4:b08445fd6b2a tip "c4"
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15e85dded933 fsmonitor: write state with wlock held and dirstate unchanged (issue5581)
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  merging a
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  custom merge tool
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  custom merge tool end
15e85dded933 fsmonitor: write state with wlock held and dirstate unchanged (issue5581)
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parents: 32812
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  saved backup bundle to $TESTTMP/repo/.hg/strip-backup/* (glob)
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This hg status should be empty, whether or not fsmonitor is enabled (issue5581).
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  $ hg status