summaryrefslogtreecommitdiff
path: root/src/luaotfload-diagnostics.lua
blob: a3a18418e61ef5386812d06470096b5286144bbe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
#!/usr/bin/env texlua
-----------------------------------------------------------------------
--         FILE:  luaotfload-diagnostics.lua
--  DESCRIPTION:  functionality accessible by the --diagnose option
-- REQUIREMENTS:  luaotfload-tool.lua
--       AUTHOR:  Philipp Gesang <phg@phi-gamma.net>
-----------------------------------------------------------------------
--
local names                    = fonts.names

local kpse                     = require "kpse"
local kpseexpand_path          = kpse.expand_path
local kpseexpand_var           = kpse.expand_var
local kpsefind_file            = kpse.find_file

local lfs                      = require "lfs"
local lfsattributes            = lfs.attributes
local lfsisfile                = lfs.isfile
local lfsreadlink              = lfs.readlink

local md5                      = require "md5"
local md5sumhexa               = md5.sumhexa

local ioopen                   = io.open

local osgetenv                 = os.getenv
local osname                   = os.name
local osremove                 = os.remove
local ostype                   = os.type
local stringformat             = string.format
local stringlower              = string.lower
local stringsub                = string.sub

local fileisreadable           = file.isreadable
local fileiswritable           = file.iswritable
local filesplitpath            = file.splitpath
local filesuffix               = file.suffix
local ioloaddata               = io.loaddata
local lua_of_json              = utilities.json.tolua
local tableconcat              = table.concat
local tablesortedkeys          = table.sortedkeys
local tabletohash              = table.tohash

local lpeg                     = require "lpeg"
local C, Cg, Ct                = lpeg.C, lpeg.Cg, lpeg.Ct
local lpegmatch                = lpeg.match

local report                   = luaotfload.log.report
local out = function (...)
    report (false, 0, "diagnose", ...)
end

local parsers                  = luaotfload.parsers
local stripslashes             = parsers.stripslashes
local splitcomma               = parsers.splitcomma

local check_index = function (errcnt)

    out "================= font names =================="
    local namedata = names.data()

    if not namedata then
        namedata = names.load ()
    end

    local mappings = namedata.mappings

    if not namedata and namedata.formats and namedata.version then
        out "Database corrupt."
        return errcnt + 1
    end

    out ("Database version: %.3f.", namedata.meta.version)
    out ("Font formats indexed: %s.",
         tableconcat (namedata.meta.formats, ", "))
    out ("%d font files indexed.", #mappings)

    local by_format = { }
    for i = 1, #mappings do
        local record = mappings[i]
        local format = stringlower (filesuffix (record.filename))
        local count  = by_format[format]
        if count then
            by_format[format] = count + 1
        else
            by_format[format] = 1
        end
    end

    local formats = tablesortedkeys (by_format)
    for i = 1, #formats do
        local format = formats[i]
        out ("%20s: %5d", format, by_format[format])
    end
    return errcnt
end

local verify_files = function (errcnt)
    out "================ verify files ================="
    local status = config.luaotfload.status
    local hashes = status.hashes
    local notes  = status.notes
    if not hashes or #hashes == 0 then
        out ("FAILED: cannot read checksums from %s.", status_file)
        return 1/0
    elseif not notes then
        out ("FAILED: cannot read commit metadata from %s.",
             status_file)
        return 1/0
    end

    out ("Luaotfload revision %s.", notes.revision)
    out ("Committed by %s.",        notes.committer)
    out ("Timestamp %s.",           notes.timestamp)

    local nhashes = #hashes
    out ("Testing %d files for integrity.", nhashes)
    for i = 1, nhashes do
        local fname, canonicalsum = unpack (hashes[i])
        local location = kpsefind_file (fname)
                      or kpsefind_file (fname, "texmfscripts")
        if not location then
            errcnt = errcnt + 1
            out ("FAILED: file %s missing.", fname)
        else
            out ("File: %s.", location)
            local raw = ioloaddata (location)
            if not raw then
                errcnt = errcnt + 1
                out ("FAILED: file %d not readable.", fname)
            else
                local sum = md5sumhexa (raw)
                if sum ~= canonicalsum then
                    errcnt = errcnt + 1
                    out ("FAILED: checksum mismatch for file %s.",
                         fname)
                    out ("Expected %s.", canonicalsum)
                    out ("Got      %s.", sum)
                else
                    out ("Ok, %s passed.", fname)
                end
            end
        end
    end
    return errcnt
end

local get_tentative_attributes = function (file)
    if not lfsisfile (file) then
        local chan = ioopen (file, "w")
        if chan then
            chan:close ()
            local attributes = lfsattributes (file)
            os.remove (file)
            return attributes
        end
    end
end

local p_permissions = Ct(Cg(Ct(C(1) * C(1) * C(1)), "u")
                       * Cg(Ct(C(1) * C(1) * C(1)), "g")
                       * Cg(Ct(C(1) * C(1) * C(1)), "o"))

local analyze_permissions = function (raw)
    return lpegmatch (p_permissions, raw)
end

local get_permissions = function (t, location)
    if stringsub (location, #location) == "/" then
        --- strip trailing slashes (lfs idiosyncrasy on Win)
        location = lpegmatch (stripslashes, location)
    end
    local attributes = lfsattributes (location)
    if not attributes then
        print""
        print("attr", location, attributes)
        os.exit()
    end

    if not attributes and t == "f" then
        attributes = get_tentative_attributes (location)
        if not attributes then
            return false
        end
    end

    local permissions

    if fileisreadable (location) then
        --- link handling appears to be unnecessary because
        --- lfs.attributes() will return the information on
        --- the link target.
        if mode == "link" then --follow and repeat
            location = lfsreadlink (location)
            attributes = lfsattributes (location)
        end
    end

    permissions = analyze_permissions (attributes.permissions)

    return {
        location    = location,
        mode        = attributes.mode,
        owner       = attributes.uid, --- useless on windows
        permissions = permissions,
        attributes  = attributes,
    }
end

local check_conformance = function (spec, permissions, errcnt)
    local uid = permissions.attributes.uid
    local gid = permissions.attributes.gid
    local raw = permissions.attributes.permissions

    out ("Owner: %d, group %d, permissions %s.", uid, gid, raw)
    if ostype == "unix" then
        if uid == 0 or gid == 0 then
            out "Owned by the superuser, permission conflict likely."
            errcnt = errcnt + 1
        end
    end

    local user = permissions.permissions.u
    if spec.r == true then
        if user[1] == "r" then
            out "Readable: ok."
        else
            out "Not readable: permissions need fixing."
            errcnt = errcnt + 1
        end
    end

    if spec.w == true then
        if user[2] == "w"
        or  fileiswritable (permissions.location) then
            out "Writable: ok."
        else
            out "Not writable: permissions need fixing."
            errcnt = errcnt + 1
        end
    end

    return errcnt
end

local init_desired_permissions = function ()
    local paths = config.luaotfload.paths
    return {
        { "d", {"r","w"}, function () return caches.getwritablepath ("", "") end },
        { "d", {"r","w"}, paths.prefix },
        { "f", {"r","w"}, paths.index_path_lua .. ".gz" },
        { "f", {"r","w"}, paths.index_path_luc },
        { "f", {"r","w"}, paths.lookup_path_lua },
        { "f", {"r","w"}, paths.lookup_path_luc },
    }
end

local check_permissions = function (errcnt)
    out [[=============== file permissions ==============]]
    local desired_permissions = init_desired_permissions ()
    for i = 1, #desired_permissions do
        local t, spec, path = unpack (desired_permissions[i])
        if type (path) == "function" then
            path = path ()
        end

        spec = tabletohash (spec)

        out ("Checking permissions of %s.", path)

        local permissions = get_permissions (t, path)
        if permissions then
            --inspect (permissions)
            errcnt = check_conformance (spec, permissions, errcnt)
        else
            errcnt = errcnt + 1
        end
    end
    return errcnt
end

local check_upstream

if kpsefind_file ("https.lua", "lua") == nil then
    check_upstream = function (errcnt)
        out       [[============= upstream repository =============
                    WARNING: Cannot retrieve repository data.
                    Github API access requires the luasec library.
                    Grab it from <https://github.com/brunoos/luasec>
                    and retry.]]
        return errcnt
    end
else
--- github api stuff begin
    local https = require "ssl.https"

    local gh_api_root     = [[https://api.github.com]]
    local release_url     = [[https://github.com/lualatex/luaotfload/releases]]
    local luaotfload_repo = [[lualatex/luaotfload]]
    local user_agent      = [[lualatex/luaotfload integrity check]]
    local shortbytes = 8

    local gh_shortrevision = function (rev)
        return stringsub (rev, 1, shortbytes)
    end

    local gh_encode_parameters = function (parameters)
        local acc = {}
        for field, value in next, parameters do
            --- unsafe, non-urlencoded coz it’s all ascii chars
            acc[#acc+1] = field .. "=" .. value
        end
        return "?" .. tableconcat (acc, "&")
    end

    local gh_make_url = function (components, parameters)
        local url = tableconcat ({ gh_api_root,
                                   unpack (components) },
                                 "/")
        if parameters then
            url = url .. gh_encode_parameters (parameters)
        end
        return url
    end

    local alright = [[HTTP/1.1 200 OK]]

    local gh_api_request = function (...)
        local args    = {...}
        local nargs   = #args
        local final   = args[nargs]
        local request = {
            url     = "",
            headers = { ["user-agent"] = user_agent },
        }
        if type (final) == "table" then
            args[nargs] = nil
            request = gh_make_url (args, final)
        else
            request = gh_make_url (args)
        end

        out ("Requesting <%s>.", request)
        local response, code, headers, status = https.request (request)
        if status ~= alright then
            out "Request failed!"
            return false
        end
        return response
    end

    local gh_api_checklimit = function (headers)
        local rawlimit  = gh_api_request "rate_limit"
        local limitdata = lua_of_json (rawlimit)
        if not limitdata and limitdata.rate then
            out "Cannot parse API rate limit."
            return false
        end
        limitdata = limitdata.rate

        local limit = tonumber (limitdata.limit)
        local left  = tonumber (limitdata.remaining)
        local reset = tonumber (limitdata.reset)

        out ("%d of %d Github API requests left.", left, limit)
        if left == 0 then
            out ("Cannot make any more API requests.")
            if ostype == "unix" then
                out ("Try again later at %s.", osdate ("%F %T", reset))
            else --- windows doesn’t C99
                out ("Try again later at %s.",
                     osdate ("%Y-%m-d %H:%M:%S", reset))
            end
        end
        return true
    end

    local gh_tags = function ()
        out "Fetching tags from repository, please stand by."
        local rawtags = gh_api_request ("repos",
                                        luaotfload_repo,
                                        "tags")
        local taglist = lua_of_json (rawtags)
        if not taglist or #taglist == 0 then
            out "Cannot parse response."
            return false
        end

        local ntags = #taglist
        out ("Repository contains %d tags.", ntags)
        local _idx, latest = next (taglist)
        out ("The most recent release is %s (revision %s).",
             latest.name,
        gh_shortrevision (latest.commit.sha))
        return latest
    end

    local gh_compare = function (head, base)
        if base == nil then
            base = "HEAD"
        end
        out ("Fetching comparison between %s and %s, \z
              please stand by.",
             gh_shortrevision (head),
             gh_shortrevision (base))
        local comparison = base .. "..." .. head
        local rawstatus = gh_api_request ("repos",
                                          luaotfload_repo,
                                          "compare",
                                          comparison)
        local status = lua_of_json (rawstatus)
        if not status then
            out "Cannot parse response for status request."
            return false
        end
        return status
    end

    local gh_news = function (since)
        local compared  = gh_compare (since)
        if not compared then
            return false
        end
        local behind_by = compared.behind_by
        local ahead_by  = compared.ahead_by
        local status    = compared.status
        out ("Comparison state: %s.", status)
        if behind_by > 0 then
            out ("Your Luaotfload is %d \z
                  revisions behind upstream.",
                 behind_by)
            return behind_by
        elseif status == "ahead" then
            out "Since you are obviously from the future \z
                 I assume you already know the repository state."
        else
            out "Everything up to date. \z
                 Luaotfload is in sync with upstream."
        end
        return false
    end

    local gh_catchup = function (current, latest)
        local compared = gh_compare (latest, current)
        local ahead_by = tonumber (compared.ahead_by)
        if ahead_by > 0 then
            local permalink_url = compared.permalink_url
            out ("Your Luaotfload is %d revisions \z
                  behind the most recent release.",
                 ahead_by)
            out ("To view the commit log, visit <%s>.",
                 permalink_url)
            out ("You can grab an up to date tarball at <%s>.",
                 release_url)
            return true
        else
            out "There weren't any new releases in the meantime."
            out "Luaotfload is up to date."
        end
        return false
    end

    check_upstream = function (current)
        out "============= upstream repository ============="
        local _succ  = gh_api_checklimit ()
        local behind = gh_news (current)
        if behind then
            local latest  = gh_tags ()
            local _behind = gh_catchup (current,
                                        latest.commit.sha,
                                        latest.name)
        end
    end

    --- trivium: diff since the first revision as pushed by Élie
    --- in 2009
    --- local firstrevision = "c3ccb3ee07e0a67171c24960966ae974e0dd8e98"
    --- check_upstream (firstrevision)
end
--- github api stuff end

local print_envvar = function (var)
    local val = osgetenv (var)
    if val then
        out ("%20s: %q", stringformat ("$%s", var), val)
        return val
    else
        out ("%20s: <unset>", stringformat ("$%s", var))
    end
end

local print_path = function (var)
    local val = osgetenv (var)
    if val then
        local paths = filesplitpath (val)
        if paths then
            local npaths = #paths
            if npaths == 1 then
                out ("%20s: %q", stringformat ("$%s", var), val)
            elseif npaths > 1 then
                out ("%20s: <%d items>", stringformat ("$%s", var), npaths)
                for i = 1, npaths do
                    out ("                   +: %q", paths[i])
                end
            else
                out ("%20s: <empty>")
            end
        end
    else
        out ("%20s: <unset>", stringformat ("$%s", var))
    end
end

local print_kpsevar = function (var)
    var = "$" .. var
    local val = kpseexpand_var (var)
    if val and val ~= var then
        out ("%20s: %q", var, val)
        return val
    else
        out ("%20s: <empty or unset>", var)
    end
end

local print_kpsepath = function (var)
    var = "$" .. var
    local val = kpseexpand_path (var)
    if val and val ~= "" then
        local paths = filesplitpath (val)
        if paths then
            local npaths = #paths
            if npaths == 1 then
                out ("%20s: %q", var, paths[1])
            elseif npaths > 1 then
                out ("%20s: <%d items>", var, npaths)
                for i = 1, npaths do
                    out ("                   +: %q", paths[i])
                end
            else
                out ("%20s: <empty>")
            end
        end
    else
        out ("%20s: <empty or unset>", var)
    end
end

--- this test first if a variable is set and then expands the
--- paths; this is necessitated by the fact that expand-path will
--- return the empty string both if the variable is unset and if
--- the directory does not exist

local print_kpsepathvar = function (var)
    local vvar = "$" .. var
    local val = kpseexpand_var (vvar)
    if val and val ~= vvar then
        out ("%20s: %q", vvar, val)
        print_kpsepath (var)
    else
        out ("%20s: <empty or unset>", var)
    end
end

local check_environment = function (errcnt)
    out "============ environment settings ============="
    out ("system: %s/%s", ostype, osname)
    if ostype == "unix" and io.popen then
        local chan = io.popen ("uname -a", "r")
        if chan then
            out ("info: %s", chan:read "*all")
            chan:close ()
        end
    end

    out "1) *shell environment*"
    print_envvar "SHELL"
    print_path "PATH"
    print_path "OSFONTDIR"
    print_envvar "USER"
    if ostype == "windows" then
        print_envvar "WINDIR"
        print_envvar "CD"
        print_path "TEMP"
    elseif ostype == "unix" then
        print_envvar "HOME"
        print_envvar "PWD"
        print_path "TMPDIR"
    end

    out "2) *kpathsea*"
    print_kpsepathvar "OPENTYPEFONTS"
    print_kpsepathvar "TTFONTS"

    print_kpsepathvar "TEXMFCACHE"
    print_kpsepathvar "TEXMFVAR"

    --- the expansion of these can be quite large; as they aren’t
    --- usually essential to luaotfload, we won’t dump every single
    --- path
    print_kpsevar "LUAINPUTS"
    print_kpsevar "CLUAINPUTS"

    return errcnt
end

local anamneses   = {
    "environment",
    "files",
    "index",
    "repository",
    "permissions"
}

local diagnose = function (job)
    local errcnt = 0
    local asked  = job.asked_diagnostics
    if asked == "all" or asked == "thorough" then
        asked = tabletohash (anamneses, true)
    else
        asked = lpegmatch (splitcomma, asked)
        asked = tabletohash (asked, true)
    end

    if asked.index == true then
        errcnt = check_index (errcnt)
        asked.index = nil
    end

    if asked.environment == true then
        errcnt = check_environment (errcnt)
        asked.environment = nil
    end

    if asked.files == true then
        errcnt = verify_files (errcnt)
        asked.files = nil
    end

    if asked.permissions == true then
        errcnt = check_permissions (errcnt)
        asked.permissions = nil
    end

    if asked.repository == true then
        local status = config.luaotfload.status
        check_upstream (status.notes.revision)
        asked.repository = nil
    end

    local rest = next (asked)
    if rest ~= nil then --> something unknown
        out ("Unknown diagnostic %q.", rest)
    end
    if errcnt == 0 then --> success
        out ("Everything appears to be in order, \z
              you may sleep well.")
        return true, false
    end
    out (             [[===============================================
                                            WARNING
                        ===============================================

                        The diagnostic detected %d errors.

                        This version of luaotfload may have been
                        tampered with. Modified versions of the
                        luaotfload source are unsupported. Read the log
                        carefully and get a clean version from CTAN or
                        github:

                            × http://www.ctan.org/pkg/luaotfload 
                            × https://github.com/lualatex/luaotfload/releases

                        If you are uncertain as to how to proceed, then
                        ask on the lualatex mailing list:

                            http://www.tug.org/mailman/listinfo/lualatex-dev

                        ===============================================
]],          errcnt)
    return true, false
end

return diagnose

-- vim:tw=71:sw=4:ts=4:expandtab