diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -229,6 +229,8 @@
             detailed_exit_code = 20
         elif isinstance(inst, error.ConfigError):
             detailed_exit_code = 30
+        elif isinstance(inst, error.HookAbort):
+            detailed_exit_code = 40
         elif isinstance(inst, error.SecurityError):
             detailed_exit_code = 150
         elif isinstance(inst, error.CanceledError):
diff --git a/tests/test-bookmarks-pushpull.t b/tests/test-bookmarks-pushpull.t
--- a/tests/test-bookmarks-pushpull.t
+++ b/tests/test-bookmarks-pushpull.t
@@ -1177,7 +1177,7 @@
   searching for changes
   no changes found
   abort: prepushkey hook exited with status 1
-  [255]
+  [40]
 
 #endif
 
diff --git a/tests/test-bookmarks.t b/tests/test-bookmarks.t
--- a/tests/test-bookmarks.t
+++ b/tests/test-bookmarks.t
@@ -1125,7 +1125,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
   $ cp .hg/bookmarks.pending.saved .hg/bookmarks.pending
 
 (check visible bookmarks while transaction running in repo)
@@ -1158,7 +1158,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
 
 Check pretxnclose-bookmark can abort a transaction
 --------------------------------------------------
@@ -1242,7 +1242,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose-bookmark.force-public hook exited with status 1
-  [255]
+  [40]
 
 create on a public changeset
 
@@ -1254,4 +1254,4 @@
   transaction abort!
   rollback completed
   abort: pretxnclose-bookmark.force-forward hook exited with status 1
-  [255]
+  [40]
diff --git a/tests/test-bundle2-exchange.t b/tests/test-bundle2-exchange.t
--- a/tests/test-bundle2-exchange.t
+++ b/tests/test-bundle2-exchange.t
@@ -638,7 +638,7 @@
   remote: Cleaning up the mess...
   remote: rollback completed
   abort: pretxnclose.failpush hook exited with status 1
-  [255]
+  [40]
 
   $ hg -R main push ssh://user@dummy/other -r e7ec4e813ba6
   pushing to ssh://user@dummy/other
@@ -699,7 +699,7 @@
   remote: Cleaning up the mess...
   remote: rollback completed
   abort: pretxnchangegroup hook exited with status 1
-  [255]
+  [40]
   $ hg -R main push ssh://user@dummy/other -r e7ec4e813ba6
   pushing to ssh://user@dummy/other
   searching for changes
@@ -747,7 +747,7 @@
   Cleaning up the mess...
   rollback completed
   abort: pretxnchangegroup hook exited with status 1
-  [255]
+  [40]
   $ hg -R main push ssh://user@dummy/other -r e7ec4e813ba6
   pushing to ssh://user@dummy/other
   searching for changes
diff --git a/tests/test-commandserver.t b/tests/test-commandserver.t
--- a/tests/test-commandserver.t
+++ b/tests/test-commandserver.t
@@ -522,7 +522,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit hook exited with status 1
-   [255]
+   [40]
   *** runcommand verify
   checking changesets
   checking manifests
@@ -1013,7 +1013,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit hook exited with status 1
-   [255]
+   [40]
   *** runcommand log
   *** runcommand verify -q
 
@@ -1057,7 +1057,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit hook exited with status 1
-   [255]
+   [40]
   *** runcommand log
   0 bar (bar)
   *** runcommand verify -q
diff --git a/tests/test-commit-amend.t b/tests/test-commit-amend.t
--- a/tests/test-commit-amend.t
+++ b/tests/test-commit-amend.t
@@ -209,7 +209,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit.test-saving-last-message hook exited with status 1
-  [255]
+  [40]
   $ cat .hg/last-message.txt
   message given from command line (no-eol)
 
@@ -234,7 +234,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit.test-saving-last-message hook exited with status 1
-  [255]
+  [40]
 
   $ cat .hg/last-message.txt
   another precious commit message
diff --git a/tests/test-dispatch.t b/tests/test-dispatch.t
--- a/tests/test-dispatch.t
+++ b/tests/test-dispatch.t
@@ -154,7 +154,7 @@
 
   $ HGPLAIN=+strictflags hg --config='hooks.pre-log=false' log -b default
   abort: pre-log hook exited with status 1
-  [255]
+  [40]
   $ HGPLAIN=+strictflags hg --cwd .. -q -Ra log -b default
   0:cb9a9f314b8b
   $ HGPLAIN=+strictflags hg --cwd .. -q --repository a log -b default
@@ -166,7 +166,7 @@
 
   $ HGPLAIN= hg log --config='hooks.pre-log=false' -b default
   abort: pre-log hook exited with status 1
-  [255]
+  [40]
   $ HGPLAINEXCEPT= hg log --cwd .. -q -Ra -b default
   0:cb9a9f314b8b
 
diff --git a/tests/test-histedit-edit.t b/tests/test-histedit-edit.t
--- a/tests/test-histedit-edit.t
+++ b/tests/test-histedit-edit.t
@@ -375,7 +375,7 @@
   note: commit message saved in .hg/last-message.txt
   note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
   $ cat .hg/last-message.txt
   f
   
@@ -400,7 +400,7 @@
   note: commit message saved in .hg/last-message.txt
   note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
 
   $ cat >> .hg/hgrc <<EOF
   > [hooks]
diff --git a/tests/test-histedit-fold.t b/tests/test-histedit-fold.t
--- a/tests/test-histedit-fold.t
+++ b/tests/test-histedit-fold.t
@@ -202,7 +202,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit.abortfolding hook failed
-  [255]
+  [40]
 
   $ cat .hg/last-message.txt
   f
diff --git a/tests/test-hook.t b/tests/test-hook.t
--- a/tests/test-hook.t
+++ b/tests/test-hook.t
@@ -227,7 +227,7 @@
   HG_PATS=[]
   
   abort: pre-identify hook exited with status 1
-  [255]
+  [40]
   $ hg cat b
   pre-cat hook: HG_ARGS=cat b
   HG_HOOKNAME=pre-cat
@@ -390,7 +390,7 @@
   HG_TAG=fa
   
   abort: pretag.forbid hook exited with status 1
-  [255]
+  [40]
   $ hg tag -l fla
   pretag hook: HG_HOOKNAME=pretag
   HG_HOOKTYPE=pretag
@@ -405,7 +405,7 @@
   HG_TAG=fla
   
   abort: pretag.forbid hook exited with status 1
-  [255]
+  [40]
 
 pretxncommit hook can see changeset, can roll back txn, changeset no
 more there after
@@ -451,7 +451,7 @@
   
   rollback completed
   abort: pretxncommit.forbid1 hook exited with status 1
-  [255]
+  [40]
   $ hg -q tip
   4:539e4b31b6dc
 
@@ -485,7 +485,7 @@
   HG_PARENT1=539e4b31b6dc99b3cfbaa6b53cbc1c1f9a1e3a10
   
   abort: precommit.forbid hook exited with status 1
-  [255]
+  [40]
   $ hg -q tip
   4:539e4b31b6dc
 
@@ -644,7 +644,7 @@
   HG_URL=file:$TESTTMP/a
   
   abort: prepushkey hook exited with status 1
-  [255]
+  [40]
   $ cd ../a
 
 test that prelistkeys can prevent listing keys
@@ -679,7 +679,7 @@
   HG_NAMESPACE=bookmarks
   
   abort: prelistkeys hook exited with status 1
-  [255]
+  [40]
   $ cd ../a
   $ rm .hg/hgrc
 
@@ -704,7 +704,7 @@
   HG_URL=file:$TESTTMP/a
   
   abort: prechangegroup.forbid hook exited with status 1
-  [255]
+  [40]
 
 pretxnchangegroup hook can see incoming changes, can roll back txn,
 incoming changes no longer there after
@@ -735,7 +735,7 @@
   transaction abort!
   rollback completed
   abort: pretxnchangegroup.forbid1 hook exited with status 1
-  [255]
+  [40]
   $ hg -q tip
   3:07f3376c1e65
 
@@ -786,7 +786,7 @@
   HG_SOURCE=pull
   
   abort: preoutgoing.forbid hook exited with status 1
-  [255]
+  [40]
 
 outgoing hooks work for local clones
 
@@ -825,7 +825,7 @@
   HG_SOURCE=clone
   
   abort: preoutgoing.forbid hook exited with status 1
-  [255]
+  [40]
 
   $ cd "$TESTTMP/b"
 
@@ -915,7 +915,7 @@
     hooktype preoutgoing
     source pull
   abort: preoutgoing.fail hook failed
-  [255]
+  [40]
 
   $ echo '[hooks]' > ../a/.hg/hgrc
   $ echo 'preoutgoing.uncallable = python:hooktests.uncallable' >> ../a/.hg/hgrc
@@ -1283,7 +1283,7 @@
   rollback completed
   strip failed, backup bundle stored in * (glob)
   abort: pretxnclose.error hook exited with status 1
-  [255]
+  [40]
   $ hg recover
   no interrupted transaction available
   [1]
@@ -1306,7 +1306,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
   $ cp .hg/store/00changelog.i.a.saved .hg/store/00changelog.i.a
 
 (check (in)visibility of new changeset while transaction running in
@@ -1331,7 +1331,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
 
 Hook from untrusted hgrc are reported as failure
 ================================================
@@ -1382,7 +1382,7 @@
   rollback completed
   abort: untrusted hook pretxnclose.testing not executed
   (see 'hg help config.trusted')
-  [255]
+  [40]
   $ hg log
   changeset:   0:3903775176ed
   tag:         tip
diff --git a/tests/test-mactext.t b/tests/test-mactext.t
--- a/tests/test-mactext.t
+++ b/tests/test-mactext.t
@@ -27,7 +27,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit.cr hook failed
-  [255]
+  [40]
   $ hg cat f | f --hexdump
   
   0000: 68 65 6c 6c 6f 0a                               |hello.|
diff --git a/tests/test-merge-tools.t b/tests/test-merge-tools.t
--- a/tests/test-merge-tools.t
+++ b/tests/test-merge-tools.t
@@ -377,7 +377,7 @@
   merging f
   some fail message
   abort: $TESTTMP/mybrokenmerge.py hook failed
-  [255]
+  [40]
   $ aftermerge
   # cat f
   revision 1
diff --git a/tests/test-mq-qfold.t b/tests/test-mq-qfold.t
--- a/tests/test-mq-qfold.t
+++ b/tests/test-mq-qfold.t
@@ -235,7 +235,7 @@
   rollback completed
   qrefresh interrupted while patch was popped! (revert --all, qpush to recover)
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
   $ cat .hg/last-message.txt
   original message
   
diff --git a/tests/test-mq-qnew.t b/tests/test-mq-qnew.t
--- a/tests/test-mq-qnew.t
+++ b/tests/test-mq-qnew.t
@@ -310,7 +310,7 @@
   note: commit message saved in .hg/last-message.txt
   note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
   $ cat .hg/last-message.txt
   
   
diff --git a/tests/test-mq-qrefresh-replace-log-message.t b/tests/test-mq-qrefresh-replace-log-message.t
--- a/tests/test-mq-qrefresh-replace-log-message.t
+++ b/tests/test-mq-qrefresh-replace-log-message.t
@@ -191,7 +191,7 @@
   rollback completed
   qrefresh interrupted while patch was popped! (revert --all, qpush to recover)
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
   $ cat .hg/last-message.txt
   Fifth commit message
    This is the 5th log message
@@ -235,7 +235,7 @@
   rollback completed
   qrefresh interrupted while patch was popped! (revert --all, qpush to recover)
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
 
 (rebuilding at failure of qrefresh bases on rev #0, and it causes
 dropping status of "file2")
@@ -273,7 +273,7 @@
   rollback completed
   qrefresh interrupted while patch was popped! (revert --all, qpush to recover)
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
 
   $ sh "$TESTTMP/checkvisibility.sh"
   ====
@@ -315,7 +315,7 @@
   rollback completed
   qrefresh interrupted while patch was popped! (revert --all, qpush to recover)
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
 
   $ sh "$TESTTMP/checkvisibility.sh"
   ====
diff --git a/tests/test-narrow-pull.t b/tests/test-narrow-pull.t
--- a/tests/test-narrow-pull.t
+++ b/tests/test-narrow-pull.t
@@ -78,7 +78,7 @@
   transaction abort!
   rollback completed
   abort: pretxnchangegroup.bad hook exited with status 1
-  [255]
+  [40]
   $ hg id
   223311e70a6f tip
 
diff --git a/tests/test-narrow-widen.t b/tests/test-narrow-widen.t
--- a/tests/test-narrow-widen.t
+++ b/tests/test-narrow-widen.t
@@ -431,7 +431,7 @@
   transaction abort!
   rollback completed
   abort: pretxnchangegroup.bad hook exited with status 1
-  [255]
+  [40]
   $ hg l
   $ hg bookmarks
   no bookmarks set
diff --git a/tests/test-phases.t b/tests/test-phases.t
--- a/tests/test-phases.t
+++ b/tests/test-phases.t
@@ -757,7 +757,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
   $ cp .hg/store/phaseroots.pending.saved .hg/store/phaseroots.pending
 
 (check (in)visibility of phaseroot while transaction running in repo)
@@ -780,7 +780,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
 
 Check that pretxnclose-phase hook can control phase movement
 
@@ -854,12 +854,12 @@
   transaction abort!
   rollback completed
   abort: pretxnclose-phase.nopublish_D hook exited with status 1
-  [255]
+  [40]
   $ hg phase --public a603bfb5a83e
   transaction abort!
   rollback completed
   abort: pretxnclose-phase.nopublish_D hook exited with status 1
-  [255]
+  [40]
   $ hg phase --draft 17a481b3bccb
   test-debug-phase: move rev 3: 2 -> 1
   test-debug-phase: move rev 4: 2 -> 1
@@ -871,7 +871,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose-phase.nopublish_D hook exited with status 1
-  [255]
+  [40]
 
   $ cd ..
 
diff --git a/tests/test-rebase-interruptions.t b/tests/test-rebase-interruptions.t
--- a/tests/test-rebase-interruptions.t
+++ b/tests/test-rebase-interruptions.t
@@ -350,7 +350,7 @@
   M A
   rebasing 6:a0b2430ebfb8 tip "F"
   abort: precommit hook exited with status 1
-  [255]
+  [40]
   $ hg tglogp
   @  7: 401ccec5e39f secret 'C'
   |
@@ -401,7 +401,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit hook exited with status 1
-  [255]
+  [40]
   $ hg tglogp
   @  7: 401ccec5e39f secret 'C'
   |
@@ -451,7 +451,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
   $ hg tglogp
   @  7: 401ccec5e39f secret 'C'
   |
diff --git a/tests/test-rollback.t b/tests/test-rollback.t
--- a/tests/test-rollback.t
+++ b/tests/test-rollback.t
@@ -103,7 +103,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit hook exited with status * (glob)
-  [255]
+  [40]
   $ cat .hg/last-message.txt ; echo
   precious commit message
 
@@ -118,7 +118,7 @@
   note: commit message saved in .hg/last-message.txt
   note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it
   abort: pretxncommit hook exited with status * (glob)
-  [255]
+  [40]
   $ cat .hg/last-message.txt
   another precious commit message
 
@@ -380,7 +380,7 @@
   warn during abort
   rollback completed
   abort: pretxncommit hook exited with status 1
-  [255]
+  [40]
 
   $ hg commit -m 'commit 1'
   warn during pretxncommit
@@ -405,7 +405,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit hook exited with status 1
-  [255]
+  [40]
 
   $ hg commit -m 'commit 1'
   warn during pretxncommit
@@ -431,7 +431,7 @@
   transaction abort!
   warn during abort
   abort: pretxncommit hook exited with status 1
-  [255]
+  [40]
 
   $ hg verify
   checking changesets
diff --git a/tests/test-share-bookmarks.t b/tests/test-share-bookmarks.t
--- a/tests/test-share-bookmarks.t
+++ b/tests/test-share-bookmarks.t
@@ -102,7 +102,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
   $ hg book bm1
 
 FYI, in contrast to above test, bmX is invisible in repo1 (= shared
@@ -127,7 +127,7 @@
   transaction abort!
   rollback completed
   abort: pretxnclose hook exited with status 1
-  [255]
+  [40]
   $ hg book bm3
 
 clean up bm2 since it's uninteresting (not shared in the vfs case and
@@ -249,7 +249,7 @@
   no changes found
   adding remote bookmark bm3
   abort: forced failure by extension
-  [255]
+  [40]
   $ hg boo
      bm1                       3:b87954705719
      bm4                       5:92793bfc8cad
diff --git a/tests/test-strip.t b/tests/test-strip.t
--- a/tests/test-strip.t
+++ b/tests/test-strip.t
@@ -427,7 +427,7 @@
   strip failed, unrecovered changes stored in '$TESTTMP/test/.hg/strip-backup/*-temp.hg' (glob)
   (fix the problem, then recover the changesets with "hg unbundle '$TESTTMP/test/.hg/strip-backup/*-temp.hg'") (glob)
   abort: pretxnchangegroup.bad hook exited with status 1
-  [255]
+  [40]
   $ restore
   $ hg log -G
   o  changeset:   4:443431ffac4f
diff --git a/tests/test-tag.t b/tests/test-tag.t
--- a/tests/test-tag.t
+++ b/tests/test-tag.t
@@ -290,7 +290,7 @@
   $ rm -f .hg/last-message.txt
   $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg tag custom-tag -e
   abort: pretag.test-saving-lastmessage hook exited with status 1
-  [255]
+  [40]
   $ test -f .hg/last-message.txt
   [1]
 
@@ -325,7 +325,7 @@
   note: commit message saved in .hg/last-message.txt
   note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it
   abort: pretxncommit.unexpectedabort hook exited with status 1
-  [255]
+  [40]
   $ cat .hg/last-message.txt
   custom tag message
   second line
diff --git a/tests/test-transplant.t b/tests/test-transplant.t
--- a/tests/test-transplant.t
+++ b/tests/test-transplant.t
@@ -1091,7 +1091,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit.abort hook exited with status 1
-  [255]
+  [40]
   $ cat >> .hg/hgrc <<EOF
   > [hooks]
   > pretxncommit.abort = !
diff --git a/tests/test-win32text.t b/tests/test-win32text.t
--- a/tests/test-win32text.t
+++ b/tests/test-win32text.t
@@ -38,7 +38,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit.crlf hook failed
-  [255]
+  [40]
 
   $ mv .hg/hgrc .hg/hgrc.bak
 
@@ -77,7 +77,7 @@
   transaction abort!
   rollback completed
   abort: pretxnchangegroup.crlf hook failed
-  [255]
+  [40]
 
   $ mv .hg/hgrc.bak .hg/hgrc
   $ echo hello > f
@@ -109,7 +109,7 @@
   transaction abort!
   rollback completed
   abort: pretxncommit.crlf hook failed
-  [255]
+  [40]
   $ hg revert -a
   forgetting d/f2
   $ rm d/f2
@@ -286,7 +286,7 @@
   transaction abort!
   rollback completed
   abort: pretxnchangegroup.crlf hook failed
-  [255]
+  [40]
 
   $ hg log -v
   changeset:   5:f0b1c8d75fce