tests/test-hgweb-json.t

wireproto: support disabling bundle1 only if repo is generaldelta

I recently implemented the server.bundle1* options to control whether
bundle1 exchange is allowed.

After thinking about Mozilla's strategy for handling generaldelta
rollout a bit more, I think server operators need an additional
lever: disable bundle1 if and only if the repo is generaldelta.

bundle1 exchange for non-generaldelta repos will not have the potential
for CPU explosion that generaldelta repos do. Therefore, it makes sense
for server operators to continue to allow bundle1 exchange for
non-generaldelta repos without having to set a per-repo hgrc option
to change the policy depending on whether the repo is generaldelta.

This patch introduces a new set of options to control bundle1 behavior
for generaldelta repos. These options enable server operators to limit
bundle1 restrictions to the class of repos that can be performance
issues. It also allows server operators to tie bundle1 access to store
format. In many server environments (including Mozilla's), legacy repos
will not be generaldelta and new repos will or might be. New repos often
aren't bound by legacy access requirements, so setting a global policy
that disallows access to new/generaldelta repos via bundle1 could be a
reasonable policy in many server environments. This patch makes this
policy very easy to implement (modify global hgrc, add options to
existing generaldelta repos to grandfather them in).

#require json
#require serve

  $ request() {
  >   get-with-headers.py --json localhost:$HGPORT "$1"
  > }

  $ hg init test
  $ cd test
  $ mkdir da
  $ echo foo > da/foo
  $ echo foo > foo
  $ hg -q ci -A -m initial
  $ echo bar > foo
  $ hg ci -m 'modify foo'
  $ echo bar > da/foo
  $ hg ci -m 'modify da/foo'
  $ hg bookmark bookmark1
  $ hg up default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (leaving bookmark bookmark1)
  $ hg mv foo foo-new
  $ hg commit -m 'move foo'
  $ hg tag -m 'create tag' tag1
  $ hg phase --public -r .
  $ echo baz > da/foo
  $ hg commit -m 'another commit to da/foo'
  $ hg tag -m 'create tag2' tag2
  $ hg bookmark bookmark2
  $ hg -q up -r 0
  $ hg -q branch test-branch
  $ echo branch > foo
  $ hg commit -m 'create test branch'
  $ echo branch_commit_2 > foo
  $ hg commit -m 'another commit in test-branch'
  $ hg -q up default
  $ hg merge --tool :local test-branch
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg commit -m 'merge test-branch into default'

  $ hg log -G
  @    changeset:   9:cc725e08502a
  |\   tag:         tip
  | |  parent:      6:ceed296fe500
  | |  parent:      8:ed66c30e87eb
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     merge test-branch into default
  | |
  | o  changeset:   8:ed66c30e87eb
  | |  branch:      test-branch
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     another commit in test-branch
  | |
  | o  changeset:   7:6ab967a8ab34
  | |  branch:      test-branch
  | |  parent:      0:06e557f3edf6
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     create test branch
  | |
  o |  changeset:   6:ceed296fe500
  | |  bookmark:    bookmark2
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     create tag2
  | |
  o |  changeset:   5:f2890a05fea4
  | |  tag:         tag2
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     another commit to da/foo
  | |
  o |  changeset:   4:93a8ce14f891
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     create tag
  | |
  o |  changeset:   3:78896eb0e102
  | |  tag:         tag1
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     move foo
  | |
  o |  changeset:   2:8d7c456572ac
  | |  bookmark:    bookmark1
  | |  user:        test
  | |  date:        Thu Jan 01 00:00:00 1970 +0000
  | |  summary:     modify da/foo
  | |
  o |  changeset:   1:f8bbb9024b10
  |/   user:        test
  |    date:        Thu Jan 01 00:00:00 1970 +0000
  |    summary:     modify foo
  |
  o  changeset:   0:06e557f3edf6
     user:        test
     date:        Thu Jan 01 00:00:00 1970 +0000
     summary:     initial
  

  $ hg serve -p $HGPORT -d --pid-file=hg.pid -A access.log -E error.log
  $ cat hg.pid >> $DAEMON_PIDS

(Try to keep these in roughly the order they are defined in webcommands.py)

(log is handled by filelog/ and changelog/ - ignore it)

(rawfile/ doesn't use templating - nothing to test)

file/{revision}/{path} shows file revision

  $ request json-file/06e557f3edf6/foo
  200 Script output follows
  
  "not yet implemented"

file/{revision} shows root directory info

  $ request json-file/cc725e08502a
  200 Script output follows
  
  {
    "abspath": "/",
    "bookmarks": [],
    "directories": [
      {
        "abspath": "/da",
        "basename": "da",
        "emptydirs": ""
      }
    ],
    "files": [
      {
        "abspath": ".hgtags",
        "basename": ".hgtags",
        "date": [
          0.0,
          0
        ],
        "flags": "",
        "size": 92
      },
      {
        "abspath": "foo-new",
        "basename": "foo-new",
        "date": [
          0.0,
          0
        ],
        "flags": "",
        "size": 4
      }
    ],
    "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
    "tags": [
      "tip"
    ]
  }

changelog/ shows information about several changesets

  $ request json-changelog
  200 Script output follows
  
  {
    "changeset_count": 10,
    "changesets": [
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "merge test-branch into default",
        "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
        "tags": [
          "tip"
        ],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "another commit in test-branch",
        "node": "ed66c30e87eb65337c05a4229efaa5f1d5285a90",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "create test branch",
        "node": "6ab967a8ab3489227a83f80e920faa039a71819f",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [
          "bookmark2"
        ],
        "date": [
          0.0,
          0
        ],
        "desc": "create tag2",
        "node": "ceed296fe500c3fac9541e31dad860cb49c89e45",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "another commit to da/foo",
        "node": "f2890a05fea49bfaf9fb27ed5490894eba32da78",
        "tags": [
          "tag2"
        ],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "create tag",
        "node": "93a8ce14f89156426b7fa981af8042da53f03aa0",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "move foo",
        "node": "78896eb0e102174ce9278438a95e12543e4367a7",
        "tags": [
          "tag1"
        ],
        "user": "test"
      },
      {
        "bookmarks": [
          "bookmark1"
        ],
        "date": [
          0.0,
          0
        ],
        "desc": "modify da/foo",
        "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "modify foo",
        "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "initial",
        "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
        "tags": [],
        "user": "test"
      }
    ],
    "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7"
  }

changelog/{revision} shows information starting at a specific changeset

  $ request json-changelog/f8bbb9024b10
  200 Script output follows
  
  {
    "changeset_count": 10,
    "changesets": [
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "modify foo",
        "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "initial",
        "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
        "tags": [],
        "user": "test"
      }
    ],
    "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8"
  }

shortlog/ shows information about a set of changesets

  $ request json-shortlog
  200 Script output follows
  
  {
    "changeset_count": 10,
    "changesets": [
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "merge test-branch into default",
        "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
        "tags": [
          "tip"
        ],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "another commit in test-branch",
        "node": "ed66c30e87eb65337c05a4229efaa5f1d5285a90",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "create test branch",
        "node": "6ab967a8ab3489227a83f80e920faa039a71819f",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [
          "bookmark2"
        ],
        "date": [
          0.0,
          0
        ],
        "desc": "create tag2",
        "node": "ceed296fe500c3fac9541e31dad860cb49c89e45",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "another commit to da/foo",
        "node": "f2890a05fea49bfaf9fb27ed5490894eba32da78",
        "tags": [
          "tag2"
        ],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "create tag",
        "node": "93a8ce14f89156426b7fa981af8042da53f03aa0",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "move foo",
        "node": "78896eb0e102174ce9278438a95e12543e4367a7",
        "tags": [
          "tag1"
        ],
        "user": "test"
      },
      {
        "bookmarks": [
          "bookmark1"
        ],
        "date": [
          0.0,
          0
        ],
        "desc": "modify da/foo",
        "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "modify foo",
        "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
        "tags": [],
        "user": "test"
      },
      {
        "bookmarks": [],
        "date": [
          0.0,
          0
        ],
        "desc": "initial",
        "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
        "tags": [],
        "user": "test"
      }
    ],
    "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7"
  }

changeset/ renders the tip changeset

  $ request json-rev
  200 Script output follows
  
  {
    "bookmarks": [],
    "branch": "default",
    "date": [
      0.0,
      0
    ],
    "desc": "merge test-branch into default",
    "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
    "parents": [
      "ceed296fe500c3fac9541e31dad860cb49c89e45",
      "ed66c30e87eb65337c05a4229efaa5f1d5285a90"
    ],
    "phase": "draft",
    "tags": [
      "tip"
    ],
    "user": "test"
  }

changeset/{revision} shows tags

  $ request json-rev/78896eb0e102
  200 Script output follows
  
  {
    "bookmarks": [],
    "branch": "default",
    "date": [
      0.0,
      0
    ],
    "desc": "move foo",
    "node": "78896eb0e102174ce9278438a95e12543e4367a7",
    "parents": [
      "8d7c456572acf3557e8ed8a07286b10c408bcec5"
    ],
    "phase": "public",
    "tags": [
      "tag1"
    ],
    "user": "test"
  }

changeset/{revision} shows bookmarks

  $ request json-rev/8d7c456572ac
  200 Script output follows
  
  {
    "bookmarks": [
      "bookmark1"
    ],
    "branch": "default",
    "date": [
      0.0,
      0
    ],
    "desc": "modify da/foo",
    "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5",
    "parents": [
      "f8bbb9024b10f93cdbb8d940337398291d40dea8"
    ],
    "phase": "public",
    "tags": [],
    "user": "test"
  }

changeset/{revision} shows branches

  $ request json-rev/6ab967a8ab34
  200 Script output follows
  
  {
    "bookmarks": [],
    "branch": "test-branch",
    "date": [
      0.0,
      0
    ],
    "desc": "create test branch",
    "node": "6ab967a8ab3489227a83f80e920faa039a71819f",
    "parents": [
      "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e"
    ],
    "phase": "draft",
    "tags": [],
    "user": "test"
  }

manifest/{revision}/{path} shows info about a directory at a revision

  $ request json-manifest/06e557f3edf6/
  200 Script output follows
  
  {
    "abspath": "/",
    "bookmarks": [],
    "directories": [
      {
        "abspath": "/da",
        "basename": "da",
        "emptydirs": ""
      }
    ],
    "files": [
      {
        "abspath": "foo",
        "basename": "foo",
        "date": [
          0.0,
          0
        ],
        "flags": "",
        "size": 4
      }
    ],
    "node": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
    "tags": []
  }

tags/ shows tags info

  $ request json-tags
  200 Script output follows
  
  {
    "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
    "tags": [
      {
        "date": [
          0.0,
          0
        ],
        "node": "f2890a05fea49bfaf9fb27ed5490894eba32da78",
        "tag": "tag2"
      },
      {
        "date": [
          0.0,
          0
        ],
        "node": "78896eb0e102174ce9278438a95e12543e4367a7",
        "tag": "tag1"
      }
    ]
  }

bookmarks/ shows bookmarks info

  $ request json-bookmarks
  200 Script output follows
  
  {
    "bookmarks": [
      {
        "bookmark": "bookmark1",
        "date": [
          0.0,
          0
        ],
        "node": "8d7c456572acf3557e8ed8a07286b10c408bcec5"
      },
      {
        "bookmark": "bookmark2",
        "date": [
          0.0,
          0
        ],
        "node": "ceed296fe500c3fac9541e31dad860cb49c89e45"
      }
    ],
    "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7"
  }

branches/ shows branches info

  $ request json-branches
  200 Script output follows
  
  {
    "branches": [
      {
        "branch": "default",
        "date": [
          0.0,
          0
        ],
        "node": "cc725e08502a79dd1eda913760fbe06ed7a9abc7",
        "status": "open"
      },
      {
        "branch": "test-branch",
        "date": [
          0.0,
          0
        ],
        "node": "ed66c30e87eb65337c05a4229efaa5f1d5285a90",
        "status": "inactive"
      }
    ]
  }

summary/ shows a summary of repository state

  $ request json-summary
  200 Script output follows
  
  "not yet implemented"

filediff/{revision}/{path} shows changes to a file in a revision

  $ request json-diff/f8bbb9024b10/foo
  200 Script output follows
  
  {
    "author": "test",
    "children": [],
    "date": [
      0.0,
      0
    ],
    "desc": "modify foo",
    "diff": [
      {
        "blockno": 1,
        "lines": [
          {
            "l": "--- a/foo\tThu Jan 01 00:00:00 1970 +0000\n",
            "n": 1,
            "t": "-"
          },
          {
            "l": "+++ b/foo\tThu Jan 01 00:00:00 1970 +0000\n",
            "n": 2,
            "t": "+"
          },
          {
            "l": "@@ -1,1 +1,1 @@\n",
            "n": 3,
            "t": "@"
          },
          {
            "l": "-foo\n",
            "n": 4,
            "t": "-"
          },
          {
            "l": "+bar\n",
            "n": 5,
            "t": "+"
          }
        ]
      }
    ],
    "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
    "parents": [
      "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e"
    ],
    "path": "foo"
  }

comparison/{revision}/{path} shows information about before and after for a file

  $ request json-comparison/f8bbb9024b10/foo
  200 Script output follows
  
  {
    "author": "test",
    "children": [],
    "comparison": [
      {
        "lines": [
          {
            "ll": "foo",
            "ln": 1,
            "rl": "bar",
            "rn": 1,
            "t": "replace"
          }
        ]
      }
    ],
    "date": [
      0.0,
      0
    ],
    "desc": "modify foo",
    "leftnode": "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e",
    "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
    "parents": [
      "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e"
    ],
    "path": "foo",
    "rightnode": "f8bbb9024b10f93cdbb8d940337398291d40dea8"
  }

annotate/{revision}/{path} shows annotations for each line

  $ request json-annotate/f8bbb9024b10/foo
  200 Script output follows
  
  {
    "abspath": "foo",
    "annotate": [
      {
        "abspath": "foo",
        "author": "test",
        "desc": "modify foo",
        "line": "bar\n",
        "lineno": 1,
        "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
        "revdate": [
          0.0,
          0
        ],
        "targetline": 1
      }
    ],
    "author": "test",
    "children": [],
    "date": [
      0.0,
      0
    ],
    "desc": "modify foo",
    "node": "f8bbb9024b10f93cdbb8d940337398291d40dea8",
    "parents": [
      "06e557f3edf66faa1ccaba5dd8c203c21cc79f1e"
    ],
    "permissions": ""
  }

filelog/{revision}/{path} shows history of a single file

  $ request json-filelog/f8bbb9024b10/foo
  200 Script output follows
  
  "not yet implemented"

(archive/ doesn't use templating, so ignore it)

(static/ doesn't use templating, so ignore it)

graph/ shows information that can be used to render a graph of the DAG

  $ request json-graph
  200 Script output follows
  
  "not yet implemented"

help/ shows help topics

  $ request json-help
  200 Script output follows
  
  {
    "earlycommands": [
      {
        "summary": "add the specified files on the next commit",
        "topic": "add"
      },
      {
        "summary": "show changeset information by line for each file",
        "topic": "annotate"
      },
      {
        "summary": "make a copy of an existing repository",
        "topic": "clone"
      },
      {
        "summary": "commit the specified files or all outstanding changes",
        "topic": "commit"
      },
      {
        "summary": "diff repository (or selected files)",
        "topic": "diff"
      },
      {
        "summary": "dump the header and diffs for one or more changesets",
        "topic": "export"
      },
      {
        "summary": "forget the specified files on the next commit",
        "topic": "forget"
      },
      {
        "summary": "create a new repository in the given directory",
        "topic": "init"
      },
      {
        "summary": "show revision history of entire repository or files",
        "topic": "log"
      },
      {
        "summary": "merge another revision into working directory",
        "topic": "merge"
      },
      {
        "summary": "pull changes from the specified source",
        "topic": "pull"
      },
      {
        "summary": "push changes to the specified destination",
        "topic": "push"
      },
      {
        "summary": "remove the specified files on the next commit",
        "topic": "remove"
      },
      {
        "summary": "start stand-alone webserver",
        "topic": "serve"
      },
      {
        "summary": "show changed files in the working directory",
        "topic": "status"
      },
      {
        "summary": "summarize working directory state",
        "topic": "summary"
      },
      {
        "summary": "update working directory (or switch revisions)",
        "topic": "update"
      }
    ],
    "othercommands": [
      {
        "summary": "add all new files, delete all missing files",
        "topic": "addremove"
      },
      {
        "summary": "create an unversioned archive of a repository revision",
        "topic": "archive"
      },
      {
        "summary": "reverse effect of earlier changeset",
        "topic": "backout"
      },
      {
        "summary": "subdivision search of changesets",
        "topic": "bisect"
      },
      {
        "summary": "create a new bookmark or list existing bookmarks",
        "topic": "bookmarks"
      },
      {
        "summary": "set or show the current branch name",
        "topic": "branch"
      },
      {
        "summary": "list repository named branches",
        "topic": "branches"
      },
      {
        "summary": "create a changegroup file",
        "topic": "bundle"
      },
      {
        "summary": "output the current or given revision of files",
        "topic": "cat"
      },
      {
        "summary": "show combined config settings from all hgrc files",
        "topic": "config"
      },
      {
        "summary": "mark files as copied for the next commit",
        "topic": "copy"
      },
      {
        "summary": "list tracked files",
        "topic": "files"
      },
      {
        "summary": "copy changes from other branches onto the current branch",
        "topic": "graft"
      },
      {
        "summary": "search for a pattern in specified files and revisions",
        "topic": "grep"
      },
      {
        "summary": "show branch heads",
        "topic": "heads"
      },
      {
        "summary": "show help for a given topic or a help overview",
        "topic": "help"
      },
      {
        "summary": "identify the working directory or specified revision",
        "topic": "identify"
      },
      {
        "summary": "import an ordered set of patches",
        "topic": "import"
      },
      {
        "summary": "show new changesets found in source",
        "topic": "incoming"
      },
      {
        "summary": "output the current or given revision of the project manifest",
        "topic": "manifest"
      },
      {
        "summary": "show changesets not found in the destination",
        "topic": "outgoing"
      },
      {
        "summary": "show aliases for remote repositories",
        "topic": "paths"
      },
      {
        "summary": "set or show the current phase name",
        "topic": "phase"
      },
      {
        "summary": "roll back an interrupted transaction",
        "topic": "recover"
      },
      {
        "summary": "rename files; equivalent of copy + remove",
        "topic": "rename"
      },
      {
        "summary": "redo merges or set/view the merge status of files",
        "topic": "resolve"
      },
      {
        "summary": "restore files to their checkout state",
        "topic": "revert"
      },
      {
        "summary": "print the root (top) of the current working directory",
        "topic": "root"
      },
      {
        "summary": "add one or more tags for the current or given revision",
        "topic": "tag"
      },
      {
        "summary": "list repository tags",
        "topic": "tags"
      },
      {
        "summary": "apply one or more changegroup files",
        "topic": "unbundle"
      },
      {
        "summary": "verify the integrity of the repository",
        "topic": "verify"
      },
      {
        "summary": "output version and copyright information",
        "topic": "version"
      }
    ],
    "topics": [
      {
        "summary": "Configuration Files",
        "topic": "config"
      },
      {
        "summary": "Date Formats",
        "topic": "dates"
      },
      {
        "summary": "Diff Formats",
        "topic": "diffs"
      },
      {
        "summary": "Environment Variables",
        "topic": "environment"
      },
      {
        "summary": "Using Additional Features",
        "topic": "extensions"
      },
      {
        "summary": "Specifying File Sets",
        "topic": "filesets"
      },
      {
        "summary": "Glossary",
        "topic": "glossary"
      },
      {
        "summary": "Syntax for Mercurial Ignore Files",
        "topic": "hgignore"
      },
      {
        "summary": "Configuring hgweb",
        "topic": "hgweb"
      },
      {
        "summary": "Technical implementation topics",
        "topic": "internals"
      },
      {
        "summary": "Merge Tools",
        "topic": "merge-tools"
      },
      {
        "summary": "Specifying Multiple Revisions",
        "topic": "multirevs"
      },
      {
        "summary": "File Name Patterns",
        "topic": "patterns"
      },
      {
        "summary": "Working with Phases",
        "topic": "phases"
      },
      {
        "summary": "Specifying Single Revisions",
        "topic": "revisions"
      },
      {
        "summary": "Specifying Revision Sets",
        "topic": "revsets"
      },
      {
        "summary": "Using Mercurial from scripts and automation",
        "topic": "scripting"
      },
      {
        "summary": "Subrepositories",
        "topic": "subrepos"
      },
      {
        "summary": "Template Usage",
        "topic": "templating"
      },
      {
        "summary": "URL Paths",
        "topic": "urls"
      }
    ]
  }

help/{topic} shows an individual help topic

  $ request json-help/phases
  200 Script output follows
  
  {
    "rawdoc": "Working with Phases\n*", (glob)
    "topic": "phases"
  }