largefiles: use "normallookup" on "lfdirstate" while reverting

Before this patch, largefiles gotten from revisions other than the
parent of the working directory at "hg revert" become "clean"
unexpectedly in steps below:

    1. "repo.status()" is invoked (for status check before reverting)
      1-1 "dirstate" entry for standinfile SF is "normal"-ed
     (1-2 "lfdirstate" entry of largefile LF (for SF) is "normal"-ed)

    2. "cmdutil.revert()" is invoked
      2-1 standinfile SF is updated in the working directory
      2-2 "dirstate" entry for SF is NOT updated

    3. "lfcommands.updatelfiles()" is invoked (by "overrides.overriderevert()")
      3-1 largefile LF (for SF) is updated in the working directory
      3-2 "dirstate" returns "n" and valid timestamp for SF (by 1-1 and 2-2)
      3-3 "lfdirstate" entry for LF is "normal"-ed
      3-4 "lfdirstate" is written into ".hg/largefiles/dirstate", and
          timestamp of LF is stored into "lfdirstate" file (by 3-3)
          (ASSUMPTION: timestamp of LF differs from one of "lfdirstate" file)

Then, "hs status" treats LF as "clean", even though LF is updated by
"other" revision (by 3-1), because "lfilesrepo.status()" always treats
"normal"-ed files (by 3-3 and 3-4) as "clean".

When largefiles are reverted, they should be "normallookup"-ed
forcibly.

This patch uses "normallookup" on "lfdirstate" while reverting, by
passing "True" to newly added argument "normallookup".

Forcible "normallookup"-ing is not so expensive, because list of
target largefiles is explicitly specified in this case.

This patch uses "[debug] dirstate.delaywrite" feature in the test, to
ensure that timestamp of the largefile gotten from "other" revision is
stored into ".hg/largefiles/dirstate" (for ASSUMPTION at 3-4)

hgext/largefiles/lfcommands.py

@@ -435,7 +435,8 b' def downloadlfiles(ui, repo, rev=None):'
         ui.status(_("%d largefiles failed to download\n") % totalmissing)
     return totalsuccess, totalmissing
 
-def updatelfiles(ui, repo, filelist=None, printmessage=True):
+def updatelfiles(ui, repo, filelist=None, printmessage=True,
+                 normallookup=False):
     wlock = repo.wlock()
     try:
         lfdirstate = lfutil.openlfdirstate(ui, repo)
@@ -516,7 +517,7 b' def updatelfiles(ui, repo, filelist=None'
             else:
                 state, mtime = '?', -1
             if state == 'n':
-                if mtime < 0:
+                if normallookup or mtime < 0:
                     # state 'n' doesn't ensure 'clean' in this case
                     lfdirstate.normallookup(lfile)
                 else:

hgext/largefiles/overrides.py

@@ -667,7 +667,13 b' def overriderevert(orig, ui, repo, *pats'
 
         newstandins = lfutil.getstandinsstate(repo)
         filelist = lfutil.getlfilestoupdate(oldstandins, newstandins)
-        lfcommands.updatelfiles(ui, repo, filelist, printmessage=False)
+        # lfdirstate should be 'normallookup'-ed for updated files,
+        # because reverting doesn't touch dirstate for 'normal' files
+        # when target revision is explicitly specified: in such case,
+        # 'n' and valid timestamp in dirstate doesn't ensure 'clean'
+        # of target (standin) file.
+        lfcommands.updatelfiles(ui, repo, filelist, printmessage=False,
+                                normallookup=True)
 
     finally:
         wlock.release()

tests/test-largefiles-update.t

@@ -79,4 +79,24 b' Test that "hg merge" updates largefiles '
   $ cat .hglf/large1
   58e24f733a964da346e2407a2bee99d9001184f5
 
+Test that "hg revert -r REV" updates largefiles from "REV" correctly
+
+  $ hg update -q -C 3
+  $ hg status -A large1
+  C large1
+  $ cat large1
+  large1 in #3
+  $ cat .hglf/large1
+  e5bb990443d6a92aaf7223813720f7566c9dd05b
+  $ hg diff -c 1 --nodates .hglf/large1 | grep '^[+-][0-9a-z]'
+  -4669e532d5b2c093a78eca010077e708a071bb64
+  +58e24f733a964da346e2407a2bee99d9001184f5
+  $ hg revert --no-backup -r 1 --config debug.dirstate.delaywrite=2 large1
+  $ hg status -A large1
+  M large1
+  $ cat large1
+  large1 in #1
+  $ cat .hglf/large1
+  58e24f733a964da346e2407a2bee99d9001184f5
+
   $ cd ..