tests/test-convert-svn-encoding.t

rust-changelog: remove special parsing of empty changelog data for null rev

For the null revision, `Revlog::get_rev_data()` will return an empty
string (of bytes). We currently handle that case in
`ChangelogRevisionData::manifest_node()`. However, it's going to be
ugly to have special handling for the null revision for each future
method on `ChangelogRevisionData`. This patch therefore restructures
the code so we instead initialize the struct with valid data for the
null revision.

Differential Revision: https://phab.mercurial-scm.org/D12438

#require svn svn-bindings

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > convert =
  > EOF

  $ svnadmin create svn-repo
  $ svnadmin load -q svn-repo < "$TESTDIR/svn/encoding.svndump"

Convert while testing all possible outputs

  $ hg --debug convert svn-repo A-hg --config progress.debug=1
  initializing destination A-hg repository
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  run hg sink pre-conversion action
  scanning source...
  found trunk at 'trunk'
  found tags at 'tags'
  found branches at 'branches'
  found branch branch\xc3\xa9 at 5 (esc)
  found branch branch\xc3\xa9e at 6 (esc)
  scanning: 1/4 revisions (25.00%)
  reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
  fetching revision log for "/trunk" from 4 to 0
  parsing revision 4 (2 changes)
  parsing revision 3 (4 changes)
  parsing revision 2 (3 changes)
  parsing revision 1 (3 changes)
  no copyfrom path, don't know what to do.
  '/branches' is not under '/trunk', ignoring
  '/tags' is not under '/trunk', ignoring
  scanning: 2/4 revisions (50.00%)
  reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9 (glob)
  fetching revision log for "/branches/branch\xc3\xa9" from 5 to 0 (esc)
  parsing revision 5 (1 changes)
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9 (glob)
  found parent of branch /branches/branch\xc3\xa9 at 4: /trunk (esc)
  scanning: 3/4 revisions (75.00%)
  reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
  fetching revision log for "/branches/branch\xc3\xa9e" from 6 to 0 (esc)
  parsing revision 6 (1 changes)
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
  found parent of branch /branches/branch\xc3\xa9e at 5: /branches/branch\xc3\xa9 (esc)
  scanning: 4/4 revisions (100.00%)
  scanning: 5/4 revisions (125.00%)
  scanning: 6/4 revisions (150.00%)
  sorting...
  converting...
  5 init projA
  source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@1
  converting: 0/6 revisions (0.00%)
  reusing manifest from p1 (no file change)
  committing changelog
  updating the branch cache
  4 hello
  source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@2
  converting: 1/6 revisions (16.67%)
  reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
  scanning paths: /trunk/\xc3\xa0 0/3 paths (0.00%) (esc)
  scanning paths: /trunk/\xc3\xa0/e\xcc\x81 1/3 paths (33.33%) (esc)
  scanning paths: /trunk/\xc3\xa9 2/3 paths (66.67%) (esc)
  committing files:
  \xc3\xa0/e\xcc\x81 (esc)
  getting files: \xc3\xa0/e\xcc\x81 1/2 files (50.00%) (esc)
  \xc3\xa9 (esc)
  getting files: \xc3\xa9 2/2 files (100.00%) (esc)
  committing manifest
  committing changelog
  updating the branch cache
  3 copy files
  source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@3
  converting: 2/6 revisions (33.33%)
  scanning paths: /trunk/\xc3\xa0 0/4 paths (0.00%) (esc)
  gone from -1
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
  scanning paths: /trunk/\xc3\xa8 1/4 paths (25.00%) (esc)
  copied to \xc3\xa8 from \xc3\xa9@2 (esc)
  scanning paths: /trunk/\xc3\xa9 2/4 paths (50.00%) (esc)
  gone from -1
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
  scanning paths: /trunk/\xc3\xb9 3/4 paths (75.00%) (esc)
  mark /trunk/\xc3\xb9 came from \xc3\xa0:2 (esc)
  getting files: \xc3\xa0/e\xcc\x81 1/4 files (25.00%) (esc)
  getting files: \xc3\xa9 2/4 files (50.00%) (esc)
  committing files:
  \xc3\xa8 (esc)
  getting files: \xc3\xa8 3/4 files (75.00%) (esc)
   \xc3\xa8: copy \xc3\xa9:6b67ccefd5ce6de77e7ead4f5292843a0255329f (esc)
  \xc3\xb9/e\xcc\x81 (esc)
  getting files: \xc3\xb9/e\xcc\x81 4/4 files (100.00%) (esc)
   \xc3\xb9/e\xcc\x81: copy \xc3\xa0/e\xcc\x81:a9092a3d84a37b9993b5c73576f6de29b7ea50f6 (esc)
  committing manifest
  committing changelog
  updating the branch cache
  2 remove files
  source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@4
  converting: 3/6 revisions (50.00%)
  scanning paths: /trunk/\xc3\xa8 0/2 paths (0.00%) (esc)
  gone from -1
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
  scanning paths: /trunk/\xc3\xb9 1/2 paths (50.00%) (esc)
  gone from -1
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  reparent to file:/*/$TESTTMP/svn-repo/trunk (glob)
  getting files: \xc3\xa8 1/2 files (50.00%) (esc)
  getting files: \xc3\xb9/e\xcc\x81 2/2 files (100.00%) (esc)
  committing files:
  committing manifest
  committing changelog
  updating the branch cache
  1 branch to branch?
  source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/branches/branch?@5
  converting: 4/6 revisions (66.67%)
  reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9 (glob)
  scanning paths: /branches/branch\xc3\xa9 0/1 paths (0.00%) (esc)
  reusing manifest from p1 (no file change)
  committing changelog
  updating the branch cache
  0 branch to branch?e
  source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/branches/branch?e@6
  converting: 5/6 revisions (83.33%)
  reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
  scanning paths: /branches/branch\xc3\xa9e 0/1 paths (0.00%) (esc)
  reusing manifest from p1 (no file change)
  committing changelog
  updating the branch cache
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
  reparent to file:/*/$TESTTMP/svn-repo (glob)
  reparent to file:/*/$TESTTMP/svn-repo/branches/branch%C3%A9e (glob)
  updating tags
  committing files:
  .hgtags
  committing manifest
  committing changelog
  updating the branch cache
  run hg sink post-conversion action
  $ cd A-hg
  $ hg up
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

Check tags are in UTF-8

  $ cat .hgtags
  e94e4422020e715add80525e8f0f46c9968689f1 branch\xc3\xa9e (esc)
  f7e66f98380ed1e53a797c5c7a7a2616a7ab377d branch\xc3\xa9 (esc)

  $ cd ..

Subversion sources don't support non-ASCII characters in HTTP(S) URLs.

  $ XFF=$("$PYTHON" -c 'from mercurial.utils.procutil import stdout; stdout.write(b"\xff")')
  $ hg convert --source-type=svn http://localhost:$HGPORT/$XFF test
  initializing destination test repository
  Subversion sources don't support non-ASCII characters in HTTP(S) URLs. Please percent-encode them.
  http://localhost:$HGPORT/\xff does not look like a Subversion repository (esc)
  abort: http://localhost:$HGPORT/\xff: missing or unsupported repository (esc)
  [255]

In Subversion, paths are Unicode (encoded as UTF-8). Therefore paths that can't
be converted between UTF-8 and the locale encoding (which is always ASCII in
tests) don't work.

  $ cp -R svn-repo $XFF
  $ hg convert $XFF test
  initializing destination test repository
  Subversion requires that paths can be converted to Unicode using the current locale encoding (ascii)
  \xff does not look like a CVS checkout (glob) (esc)
  $TESTTMP/\xff does not look like a Git repository (esc)
  \xff does not look like a Subversion repository (glob) (esc)
  \xff is not a local Mercurial repository (glob) (esc)
  \xff does not look like a darcs repository (glob) (esc)
  \xff does not look like a monotone repository (glob) (esc)
  \xff does not look like a GNU Arch repository (glob) (esc)
  \xff does not look like a Bazaar repository (glob) (esc)
  cannot find required "p4" tool
  abort: \xff: missing or unsupported repository (glob) (esc)
  [255]
  $ hg convert file://$TESTTMP/$XFF test
  initializing destination test repository
  Subversion requires that file URLs can be converted to Unicode using the current locale encoding (ascii)
  file:/*/$TESTTMP/\xff does not look like a CVS checkout (glob) (esc)
  $TESTTMP/file:$TESTTMP/\xff does not look like a Git repository (esc)
  file:/*/$TESTTMP/\xff does not look like a Subversion repository (glob) (esc)
  file:/*/$TESTTMP/\xff is not a local Mercurial repository (glob) (esc)
  file:/*/$TESTTMP/\xff does not look like a darcs repository (glob) (esc)
  file:/*/$TESTTMP/\xff does not look like a monotone repository (glob) (esc)
  file:/*/$TESTTMP/\xff does not look like a GNU Arch repository (glob) (esc)
  file:/*/$TESTTMP/\xff does not look like a Bazaar repository (glob) (esc)
  file:/*/$TESTTMP/\xff does not look like a P4 repository (glob) (esc)
  abort: file:/*/$TESTTMP/\xff: missing or unsupported repository (glob) (esc)
  [255]

Subversion decodes percent-encoded bytes on the converted, UTF-8-encoded
string. Therefore, if the percent-encoded bytes aren't valid UTF-8, Subversion
would choke on them when converting them to the locale encoding.

  $ hg convert file://$TESTTMP/%FF test
  initializing destination test repository
  Subversion does not support non-UTF-8 percent-encoded bytes in file URLs
  file:/*/$TESTTMP/%FF does not look like a CVS checkout (glob)
  $TESTTMP/file:$TESTTMP/%FF does not look like a Git repository
  file:/*/$TESTTMP/%FF does not look like a Subversion repository (glob)
  file:/*/$TESTTMP/%FF is not a local Mercurial repository (glob)
  file:/*/$TESTTMP/%FF does not look like a darcs repository (glob)
  file:/*/$TESTTMP/%FF does not look like a monotone repository (glob)
  file:/*/$TESTTMP/%FF does not look like a GNU Arch repository (glob)
  file:/*/$TESTTMP/%FF does not look like a Bazaar repository (glob)
  file:/*/$TESTTMP/%FF does not look like a P4 repository (glob)
  abort: file:/*/$TESTTMP/%FF: missing or unsupported repository (glob)
  [255]