archive: always use portable path component separators with subrepos

The previous behavior when archiving a subrepo 's' on Windows was to internally
name the file under it 's\file', due to the use of vfs.reljoin().  When printing
the file list from the archive on Windows or Linux, the file was named
's\\file'.  The archive extracted OK on Windows, but if the archive was brought
to a Linux system, it created a file named 's\file' instead of a directory 's'
containing 'file'.

*.zip format achives seemed not to have the problem, but this was definitely an
issue with *.tgz archives.

Largefiles actually got this right, but a test is added to keep this from
regressing.  The subrepo-deep-nested-change.t test was repurposed to archive to
a file, since there are several subsequent tests that archive to a directory.
The output change is losing the filesystem prefix '../archive_lf' and not
listing the directories 'sub1' and 'sub1/sub2'.

mercurial/subrepo.py

@@ -517,7 +517,7 b' class abstractsubrepo(object):'
             flags = self.fileflags(name)
             mode = 'x' in flags and 0755 or 0644
             symlink = 'l' in flags
-            archiver.addfile(self.wvfs.reljoin(prefix, self._path, name),
+            archiver.addfile(prefix + self._path + '/' + name,
                              mode, symlink, self.filedata(name))
             self.ui.progress(_('archiving (%s)') % relpath, i + 1,
                              unit=_('files'), total=total)
@@ -731,8 +731,7 b' class hgsubrepo(abstractsubrepo):'
         for subpath in ctx.substate:
             s = subrepo(ctx, subpath)
             submatch = matchmod.narrowmatcher(subpath, match)
-            total += s.archive(
-                archiver, self.wvfs.reljoin(prefix, self._path), submatch)
+            total += s.archive(archiver, prefix + self._path + '/', submatch)
         return total
 
     @annotatesubrepoerror
@@ -1675,7 +1674,7 b' class gitsubrepo(abstractsubrepo):'
                 data = info.linkname
             else:
                 data = tar.extractfile(info).read()
-            archiver.addfile(self.wvfs.reljoin(prefix, self._path, info.name),
+            archiver.addfile(prefix + self._path + '/' + info.name,
                              info.mode, info.issym(), data)
             total += 1
             self.ui.progress(_('archiving (%s)') % relpath, i + 1,

tests/test-subrepo-deep-nested-change.t

@@ -309,21 +309,17 b' Exclude large files from main and sub-su'
 
 Exclude normal files from main and sub-sub repo
 
-  $ hg --config extensions.largefiles= archive -S -X '**.txt' ../archive_lf
-  $ find ../archive_lf | sort
-  ../archive_lf
-  ../archive_lf/.hgsub
-  ../archive_lf/.hgsubstate
-  ../archive_lf/large.bin
-  ../archive_lf/main
-  ../archive_lf/sub1
-  ../archive_lf/sub1/.hgsub
-  ../archive_lf/sub1/.hgsubstate
-  ../archive_lf/sub1/sub1
-  ../archive_lf/sub1/sub2
-  ../archive_lf/sub1/sub2/large.bin
-  ../archive_lf/sub1/sub2/sub2
-  $ rm -rf ../archive_lf
+  $ hg --config extensions.largefiles= archive -S -X '**.txt' ../archive_lf.tgz
+  $ tar -tzf ../archive_lf.tgz | sort
+  archive_lf/.hgsub
+  archive_lf/.hgsubstate
+  archive_lf/large.bin
+  archive_lf/main
+  archive_lf/sub1/.hgsub
+  archive_lf/sub1/.hgsubstate
+  archive_lf/sub1/sub1
+  archive_lf/sub1/sub2/large.bin
+  archive_lf/sub1/sub2/sub2
 
 Include normal files from within a largefiles subrepo
 

tests/test-subrepo-git.t

@@ -325,6 +325,14 b' archive subrepos'
   ../archive_x/s
   ../archive_x/s/g
 
+  $ hg -R ../tc archive -S ../archive.tgz 2>/dev/null
+  $ tar -tzf ../archive.tgz | sort
+  archive/.hg_archival.txt
+  archive/.hgsub
+  archive/.hgsubstate
+  archive/a
+  archive/s/g
+
 create nested repo
 
   $ cd ..

tests/test-subrepo-recursion.t

@@ -434,6 +434,18 b" Note there's a slight output glitch on n"
   cloning subrepo foo/bar from $TESTTMP/repo/foo/bar (glob)
 #endif
 
+Archive + subrepos uses '/' for all component separators
+
+  $ tar -tzf ../archive.tar.gz | sort
+  archive/.hg_archival.txt
+  archive/.hgsub
+  archive/.hgsubstate
+  archive/foo/.hgsub
+  archive/foo/.hgsubstate
+  archive/foo/bar/z.txt
+  archive/foo/y.txt
+  archive/x.txt
+
 The newly cloned subrepos contain no working copy:
 
   $ hg -R foo summary