eol: make the hook check all new heads, not only tip (issue2666)

Report and test by Antoine Pitrou <solipsis@pitrou.net>

hgext/eol.py

@@ -202,13 +202,20 @@ def parseeol(ui, repo, nodes):
 
 def hook(ui, repo, node, hooktype, **kwargs):
     """verify that files have expected EOLs"""
+    # Extract heads and get touched files set at the same time
     files = set()
+    heads = set()
     for rev in xrange(repo[node].rev(), len(repo)):
-        files.update(repo[rev].files())
-    tip = repo['tip']
-    eol = parseeol(ui, repo, [tip.node()])
-    if eol:
-        eol.checkrev(repo, tip, files)
+        ctx = repo[rev]
+        files.update(ctx.files())
+        heads.add(rev)
+        for pctx in ctx.parents():
+            heads.discard(pctx.rev())
+    for rev in heads:
+        ctx = repo[rev]
+        eol = parseeol(ui, repo, [ctx.node()])
+        if eol:
+            eol.checkrev(repo, ctx, files)
 
 def preupdate(ui, repo, hooktype, parent1, parent2):
     #print "preupdate for %s: %s -> %s" % (repo.root, parent1, parent2)

tests/test-eol-hook.t

@@ -81,3 +81,38 @@ Create repo
   adding manifests
   adding file changes
   added 2 changesets with 2 changes to 1 files
+
+  $ printf "first\r\nsecond" > b.txt
+  $ hg add b.txt
+  $ hg commit -m 'CRLF b.txt'
+  $ hg push ../main
+  pushing to ../main
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  error: pretxnchangegroup hook failed: b.txt should not have CRLF line endings
+  transaction abort!
+  rollback completed
+  abort: b.txt should not have CRLF line endings
+  [255]
+
+  $ hg up -r -2
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+  $ printf "some\nother\nfile" > c.txt
+  $ hg add c.txt
+  $ hg commit -m "LF c.txt, b.txt doesn't exist here"
+  created new head
+  $ hg push -f ../main
+  pushing to ../main
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 2 changesets with 2 changes to 2 files (+1 heads)
+  error: pretxnchangegroup hook failed: b.txt should not have CRLF line endings
+  transaction abort!
+  rollback completed
+  abort: b.txt should not have CRLF line endings
+  [255]