1OPAM-LINT(1) Opam Manual OPAM-LINT(1)
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6 opam-lint - Checks and validate package description ('opam') files.
7
9 opam lint [OPTION]... [FILES]...
10
12 Given an opam file, performs several quality checks on it and outputs
13 recommendations, warnings or errors on stderr.
14
16 FILES
17 Name of the opam files to check, or directory containing them.
18 Current directory if unspecified
19
21 --check-upstream
22 Check upstream, archive availability and checksum(s)
23 --no
25 Answer no to all opam yes/no questions without prompting. See also
26 --confirm-level. This is equivalent to setting $OPAMNO to "true".
27 --normalise
29 Output a normalised version of the opam file to stdout
30 --package=PKG
32 Lint the current definition of the given package instead of
33 specifying an opam file directly.
34 -s, --short
36 Only print the warning/error numbers, space-separated, if any
37 -W WARNS, --warnings=WARNS
39 Select the warnings to show or hide. WARNS should be a
40 concatenation of +N, -N, +N..M, -N..M to respectively enable or
41 disable warning or error number N or all warnings with numbers
42 between N and M inclusive. All warnings are enabled by default,
43 unless WARNS starts with +, which disables all but the selected
44 ones.
45 -y, --yes
47 Answer yes to all opam yes/no questions without prompting. See also
48 --confirm-level. This is equivalent to setting $OPAMYES to "true".
49
51 W20: Field 'opam-version' refers to the patch version of opam, it
52 should be of the form MAJOR.MINOR
53 E21: Field 'opam-version' doesn't match the current version, validation
55 may not be accurate
56 E22: Some fields are present but empty; remove or fill them
58 E23: Missing field 'maintainer'
60 E24: Field 'maintainer' has the old default value
62 W25: Missing field 'authors'
64 W26: No field 'install', but a field 'remove': install instructions
66 probably part of 'build'. Use the 'install' field or a .install file
67 E28: Unknown package flags found
69 E29: Package dependencies mention package variables
71 E31: Fields 'depends' and 'depopts' refer to the same package names
73 E32: Field 'ocaml-version:' and variable 'ocaml-version' are
75 deprecated, use a dependency towards the 'ocaml' package instead for
76 availability, and the 'ocaml:version' package variable for scripts
77 E33: Field 'os' is deprecated, use 'available' and the 'os' variable
79 instead
80 E34: Field 'available:' contains references to package-local variables.
82 It should only be determined from global configuration variables
83 W35: Missing field 'homepage'
85 W36: Missing field 'bug-reports'
87 W37: Missing field 'dev-repo'
89 E39: Command 'make' called directly, use the built-in variable instead
91 W41: Some packages are mentioned in package scripts or features, but
93 there is no dependency or depopt toward them
94 E42: The 'dev-repo:' field doesn't use version control. You should use
96 URLs of the form "git://", "git+https://", "hg+https://"...
97 E43: Conjunction used in 'conflicts:' field. Only '|' is allowed
99 W44: The 'plugin' package flag is set but the package name doesn't
101 begin with 'opam-'
102 E45: Unclosed variable interpolations in strings
104 E46: Package is flagged "conf" but has source, install or remove
106 instructions
107 W47: Synopsis (or description first line) should start with a capital
109 and not end with a dot
110 W48: The fields 'build-test:' and 'build-doc:' are deprecated, and
112 should be replaced by uses of the 'with-test' and 'with-doc' filter
113 variables in the 'build:' and 'install:' fields, and by the newer
114 'run-test:' field
115 W49: The following URLs don't use version control but look like version
117 control URLs
118 W50: The 'post' flag doesn't make sense with build or optional
120 dependencies
121 E51: The behaviour for negated dependency flags 'build' or 'post' is
123 unspecified
124 E52: Package is needlessly flagged "light-uninstall", since it has no
126 remove instructions
127 E53: Mismatching 'extra-files:' field
129 W54: External dependencies should not contain spaces nor empty string
131 E55: Non-normalised OS or arch string being tested
133 W56: It is discouraged for non-compiler packages to use 'setenv:'
135 E57: Synopsis and description must not be both empty
137 W58: Found variable, predefined one
139 W59: url doesn't contain a checksum
141 E60: Upstream check failed
143 W61: `with-test` variable in `run-test` is out of scope, it will be
145 ignored
146 W62: License doesn't adhere to the SPDX standard, see
148 https://spdx.org/licenses/
149 E65: URLs must be absolute
151 W66: String that can't be resolved to bool in filtered package formula
153 E67: Checksum specified with a non archive url
155
157 These options are common to all commands.
158 --best-effort
160 Don't fail if all requested packages can't be installed: try to
161 install as many as possible. Note that not all external solvers may
162 support this option (recent versions of aspcud or mccs should).
163 This is equivalent to setting $OPAMBESTEFFORT environment variable.
164 --cli=MAJOR.MINOR (absent=2.1)
166 Use the command-line interface syntax and semantics of MAJOR.MINOR.
167 Intended for any persistent use of opam (scripts, blog posts,
168 etc.), any version of opam in the same MAJOR series will behave as
169 for the specified MINOR release. The flag was not available in opam
170 2.0, so to select the 2.0 CLI, set the OPAMCLI environment variable
171 to 2.0 instead of using this parameter.
172 --color=WHEN
174 Colorize the output. WHEN must be one of `always', `never' or
175 `auto'.
176 --confirm-level=LEVEL
178 Confirmation level, LEVEL must be one of `ask', `no', `yes' or
179 `unsafe-yes'. Can be specified more than once. If --yes or --no are
180 also given, the value of the last --confirm-level is taken into
181 account. This is equivalent to setting $OPAMCONFIRMLEVEL`.
182 --criteria=CRITERIA
184 Specify user preferences for dependency solving for this run.
185 Overrides both $OPAMCRITERIA and $OPAMUPGRADECRITERIA. For details
186 on the supported language, and the external solvers available, see
187 http://opam.ocaml.org/doc/External_solvers.html. A general guide to
188 using solver preferences can be found at
189 http://www.dicosmo.org/Articles/usercriteria.pdf.
190 --cudf=FILENAME
192 Debug option: Save the CUDF requests sent to the solver to
193 FILENAME-<n>.cudf.
194 --debug
196 Print debug message to stderr. This is equivalent to setting
197 $OPAMDEBUG to "true".
198 --debug-level=LEVEL
200 Like --debug, but allows specifying the debug level (--debug sets
201 it to 1). Equivalent to setting $OPAMDEBUG to a positive integer.
202 --git-version
204 Print the git version of opam, if set (i.e. you are using a
205 development version), and exit.
206 --help[=FMT] (default=auto)
208 Show this help in format FMT. The value FMT must be one of `auto',
209 `pager', `groff' or `plain'. With `auto', the format is `pager` or
210 `plain' whenever the TERM env var is `dumb' or undefined.
211 --ignore-pin-depends
213 Ignore extra pins required by packages that get pinned, either
214 manually through opam pin or through opam install DIR. This is
215 equivalent to setting IGNOREPINDEPENDS=true.
216 --json=FILENAME
218 Save the results of the opam run in a computer-readable file. If
219 the filename contains the character `%', it will be replaced by an
220 index that doesn't overwrite an existing file. Similar to setting
221 the $OPAMJSON variable.
222 --no-aspcud
224 Removed in 2.1.
225 --no-auto-upgrade
227 When configuring or updating a repository that is written for an
228 earlier opam version (1.2), opam internally converts it to the
229 current format. This disables this behaviour. Note that
230 repositories should define their format version in a 'repo' file at
231 their root, or they will be assumed to be in the older format. It
232 is, in any case, preferable to upgrade the repositories manually
233 using opam admin upgrade [--mirror URL] when possible.
234 --no-self-upgrade
236 Opam will replace itself with a newer binary found at OPAMROOT/opam
237 if present. This disables this behaviour.
238 -q, --quiet
240 Disables --verbose.
241 --root=ROOT
243 Use ROOT as the current root path. This is equivalent to setting
244 $OPAMROOT to ROOT.
245 --safe, --readonly
247 Make sure nothing will be automatically updated or rewritten.
248 Useful for calling from completion scripts, for example. Will fail
249 whenever such an operation is needed ; also avoids waiting for
250 locks, skips interactive questions and overrides the $OPAMDEBUG
251 variable. This is equivalent to set environment variable $OPAMSAFE.
252 --solver=CMD
254 Specify the CUDF solver to use for resolving package installation
255 problems. This is either a predefined solver (this version of opam
256 supports builtin-mccs+lp(), builtin-mccs+glpk,
257 builtin-dummy-z3-solver, builtin-dummy-0install-solver, aspcud,
258 mccs, aspcud-old, packup), or a custom command that should contain
259 the variables %{input}%, %{output}%, %{criteria}%, and optionally
260 %{timeout}%. This is equivalent to setting $OPAMEXTERNALSOLVER.
261 --strict
263 Fail whenever an error is found in a package definition or a
264 configuration file. The default is to continue silently if
265 possible.
266 --switch=SWITCH
268 Use SWITCH as the current compiler switch. This is equivalent to
269 setting $OPAMSWITCH to SWITCH.
270 --use-internal-solver
272 Disable any external solver, and use the built-in one (this
273 requires that opam has been compiled with a built-in solver). This
274 is equivalent to setting $OPAMNOASPCUD or $OPAMUSEINTERNALSOLVER.
275 -v, --verbose
277 Be more verbose. One -v shows all package commands, repeat to also
278 display commands called internally (e.g. tar, curl, patch etc.)
279 Repeating n times is equivalent to setting $OPAMVERBOSE to "n".
280 --version
282 Show version information.
283 -w, --working-dir
285 Whenever updating packages that are bound to a local,
286 version-controlled directory, update to the current working state
287 of their source instead of the last committed state, or the ref
288 they are pointing to. As source directory is copied as it is, if it
289 isn't clean it may result on a opam build failure.This only affects
290 packages explicitly listed on the command-line.It can also be set
291 with $OPAMWORKINGDIR.
292
294 Opam makes use of the environment variables listed here. Boolean
295 variables should be set to "0", "no", "false" or the empty string to
296 disable, "1", "yes" or "true" to enable.
297 OPAMALLPARENS surround all filters with parenthesis.
299 OPAMASSUMEDEPEXTS see option `--assume-depexts'.
301 OPAMAUTOREMOVE see remove option `--auto-remove'.
303 OPAMBESTEFFORT see option `--best-effort'.
305 OPAMBESTEFFORTPREFIXCRITERIA sets the string that must be prepended to
307 the criteria when the `--best-effort' option is set, and is expected to
308 maximise the `opam-query' property in the solution.
309 OPAMBUILDDOC Removed in 2.1.
311 OPAMBUILDTEST Removed in 2.1.
313 OPAMCLI see option `--cli'.
315 OPAMCOLOR when set to always or never, sets a default value for the
317 `--color' option.
318 OPAMCONFIRMLEVEL see option `--confirm-level`. OPAMCONFIRMLEVEL has
320 priority over OPAMYES and OPAMNO.
321 OPAMCRITERIA specifies user preferences for dependency solving. The
323 default value depends on the solver version, use `config report' to
324 know the current setting. See also option --criteria.
325 OPAMCUDFFILE save the cudf graph to file-actions-explicit.dot.
327 OPAMCUDFTRIM controls the filtering of unrelated packages during CUDF
329 preprocessing.
330 OPAMCURL can be used to select a given 'curl' program. See OPAMFETCH
332 for more options.
333 OPAMDEBUG see options `--debug' and `--debug-level'.
335 OPAMDEBUGSECTIONS if set, limits debug messages to the space-separated
337 list of sections. Sections can optionally have a specific debug level
338 (for example, CLIENT:2 or CLIENT CUDF:2), but otherwise use
339 `--debug-level'.
340 OPAMDIGDEPTH defines how aggressive the lookup for conflicts during
342 CUDF preprocessing is.
343 OPAMDOWNLOADJOBS sets the maximum number of simultaneous downloads.
345 OPAMDROPWORKINGDIR overrides packages previously updated with
347 --working-dir on update. Without this variable set, opam would keep
348 them unchanged unless explicitly named on the command-line.
349 OPAMDRYRUN see option `--dry-run'.
351 OPAMEDITOR sets the editor to use for opam file editing, overrides
353 $EDITOR and $VISUAL.
354 OPAMERRLOGLEN sets the number of log lines printed when a sub-process
356 fails. 0 to print all.
357 OPAMEXTERNALSOLVER see option `--solver'.
359 OPAMFAKE see option `--fake'.
361 OPAMFETCH specifies how to download files: either `wget', `curl' or a
363 custom command where variables %{url}%, %{out}%, %{retry}%,
364 %{compress}% and %{checksum}% will be replaced. Overrides the
365 'download-command' value from the main config file.
366 OPAMFIXUPCRITERIA same as OPAMUPGRADECRITERIA, but specific to fixup.
368 OPAMIGNORECONSTRAINTS see install option `--ignore-constraints-on'.
370 OPAMIGNOREPINDEPENDS see option `--ignore-pin-depends'.
372 OPAMINPLACEBUILD see option `--inplace-build'.
374 OPAMJOBS sets the maximum number of parallel workers to run.
376 OPAMJSON log json output to the given file (use character `%' to index
378 the files).
379 OPAMKEEPBUILDDIR see install option `--keep-build-dir'.
381 OPAMKEEPLOGS tells opam to not remove some temporary command logs and
383 some backups. This skips some finalisers and may also help to get more
384 reliable backtraces.
385 OPAMLOCKED combination of `--locked' and `--lock-suffix' options.
387 OPAMLOGS logdir sets log directory, default is a temporary directory in
389 /tmp
390 OPAMMAKECMD set the system make command to use.
392 OPAMMERGEOUT merge process outputs, stderr on stdout.
394 OPAMNO answer no to any question asked, see options `--no` and
396 `--confirm-level`. OPAMNO is ignored if either OPAMCONFIRMLEVEL or
397 OPAMYES is set.
398 OPAMNOAGGREGATE with `opam admin check', don't aggregate packages.
400 OPAMNOASPCUD Deprecated.
402 OPAMNOAUTOUPGRADE disables automatic internal upgrade of repositories
404 in an earlier format to the current one, on 'update' or 'init'.
405 OPAMNOCHECKSUMS enables option --no-checksums when available.
407 OPAMNODEPEXTS disables system dependencies handling, see option
409 `--no-depexts'.
410 OPAMNOENVNOTICE Internal.
412 OPAMNOSELFUPGRADE see option `--no-self-upgrade'
414 OPAMPINKINDAUTO sets whether version control systems should be detected
416 when pinning to a local path. Enabled by default since 1.3.0.
417 OPAMPRECISETRACKING fine grain tracking of directories.
419 OPAMPREPRO set this to false to disable CUDF preprocessing. Less
421 efficient, but might help debugging solver issue.
422 OPAMREQUIRECHECKSUMS Enables option `--require-checksums' when
424 available (e.g. for `opam install').
425 OPAMRETRIES sets the number of tries before failing downloads.
427 OPAMREUSEBUILDDIR see option `--reuse-build-dir'.
429 OPAMROOT see option `--root'. This is automatically set by `opam env
431 --root=DIR --set-root'.
432 OPAMROOTISOK don't complain when running as root.
434 OPAMSAFE see option `--safe'.
436 OPAMSHOW see option `--show'.
438 OPAMSKIPUPDATE see option `--skip-updates'.
440 OPAMSKIPVERSIONCHECKS bypasses some version checks. Unsafe, for
442 compatibility testing only.
443 OPAMSOLVERALLOWSUBOPTIMAL (default `true') allows some solvers to still
445 return a solution when they reach timeout; while the solution remains
446 assured to be consistent, there is no guarantee in this case that it
447 fits the expected optimisation criteria. If `true', opam willcontinue
448 with a warning, if `false' a timeout is an error. Currently only the
449 builtin-z3 backend handles this degraded case.
450 OPAMSOLVERTIMEOUT change the time allowance of the solver. Default is
452 60.0, set to 0 for unlimited. Note that all solvers may not support
453 this option.
454 OPAMSTATS display stats at the end of command.
456 OPAMSTATUSLINE display a dynamic status line showing what's currently
458 going on on the terminal. (one of one of `always', `never' or `auto')
459 OPAMSTRICT fail on inconsistencies (file reading, switch import, etc.).
461 OPAMSWITCH see option `--switch'. Automatically set by `opam env
463 --switch=SWITCH --set-switch'.
464 OPAMUNLOCKBASE see install option `--unlock-base'.
466 OPAMUPGRADECRITERIA specifies user preferences for dependency solving
468 when performing an upgrade. Overrides OPAMCRITERIA in upgrades if both
469 are set. See also option --criteria.
470 OPAMUSEINTERNALSOLVER see option `--use-internal-solver'.
472 OPAMUSEOPENSSL force openssl use for hash computing.
474 OPAMUTF8 use UTF8 characters in output (one of one of `always', `never'
476 or `auto'). By default `auto', which is determined from the locale).
477 OPAMUTF8MSGS use extended UTF8 characters (camels) in opam messages.
479 Implies OPAMUTF8. This is set by default on OSX only.
480 OPAMVALIDATIONHOOK if set, uses the `%{hook%}' command to validate an
482 opam repository update.
483 OPAMVERBOSE see option `--verbose'.
485 OPAMVERSIONLAGPOWER do not use.
487 OPAMWITHDOC see install option `--with-doc'.
489 OPAMWITHTEST see install option `--with-test.
491 OPAMWORKINGDIR see option `--working-dir'.
493 OPAMYES see options `--yes' and `--confirm-level`. OPAMYES has has
495 priority over OPAMNO and is ignored if OPAMCONFIRMLEVEL is set.
496 OPAMVAR_var overrides the contents of the variable var when
498 substituting `%{var}%` strings in `opam` files.
499 OPAMVAR_package_var overrides the contents of the variable package:var
501 when substituting `%{package:var}%` strings in `opam` files.
502
504 All scripts and programmatic invocations of opam should use `--cli' in
505 order to ensure that they work seamlessly with future versions of the
506 opam client. Additionally, blog posts or other documentation can
507 benefit, as it prevents information from becoming stale.
508 Although opam only supports roots (~/.opam/) for the current version,
510 it does provide backwards compatibility for its command-line interface.
511 Since CLI version support was only added in opam 2.1, use OPAMCLI to
513 select 2.0 support (as opam 2.0 will just ignore it), and `--cli=2.1'
514 for 2.1 (or later) versions, since an environment variable controlling
515 the parsing of syntax is brittle. To this end, opam displays a warning
516 if OPAMCLI specifies a valid version other than 2.0, and also if
517 `--cli=2.0' is specified.
518 The command-line version is selected by using the `--cli' option or the
520 OPAMCLI environment variable. `--cli' may be specified morethan once,
521 where the last instance takes precedence. OPAMCLI is only inspected if
522 `--cli' is not given.
523
525 As an exception to the following, the `exec' command returns 127 if the
526 command was not found or couldn't be executed, and the command's exit
527 value otherwise.
528 0 Success, or true for boolean queries.
530 1 False. Returned when a boolean return value is expected, e.g. when
532 running with --check, or for queries like opam lint.
533 2 Bad command-line arguments, or command-line arguments pointing to
535 an invalid context (e.g. file not following the expected format).
536 5 Not found. You requested something (package, version, repository,
538 etc.) that couldn't be found.
539 10 Aborted. The operation required confirmation, which wasn't given.
541 15 Could not acquire the locks required for the operation.
543 20 There is no solution to the user request. This can be caused by
545 asking to install two incompatible packages, for example.
546 30 Error in package definition, or other metadata files. Using
548 --strict raises this error more often.
549 31 Package script error. Some package operations were unsuccessful.
551 This may be an error in the packages or an incompatibility with
552 your system. This can be a partial error.
553 40 Sync error. Could not fetch some remotes from the network. This can
555 be a partial error.
556 50 Configuration error. Opam or system configuration doesn't allow
558 operation, and needs fixing.
559 60 Solver failure. The solver failed to return a sound answer. It can
561 be due to a broken external solver, or an error in solver
562 configuration.
563 99 Internal error. Something went wrong, likely due to a bug in opam
565 itself.
566 130 User interrupt. SIGINT was received, generally due to the user
568 pressing Ctrl-C.
569
571 See https://opam.ocaml.org/doc.
572
574 Vincent Bernardoff <vb@luminar.eu.org>
575 Raja Boujbel <raja.boujbel@ocamlpro.com>
576 Roberto Di Cosmo <roberto@dicosmo.org>
577 Thomas Gazagnaire <thomas@gazagnaire.org>
578 Louis Gesbert <louis.gesbert@ocamlpro.com>
579 Fabrice Le Fessant <Fabrice.Le_fessant@inria.fr>
580 Anil Madhavapeddy <anil@recoil.org>
581 Guillem Rieu <guillem.rieu@ocamlpro.com>
582 Ralf Treinen <ralf.treinen@pps.jussieu.fr>
583 Frederic Tuong <tuong@users.gforge.inria.fr>
584
586 Check bug reports at https://github.com/ocaml/opam/issues.
587Opam 2.1.2 OPAM-LINT(1)