1OPAM-CLEAN(1)                     Opam Manual                    OPAM-CLEAN(1)
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NAME

6       opam-clean - Cleans up opam caches
7

SYNOPSIS

9       opam clean [OPTION]…
10

DESCRIPTION

12       Cleans up opam caches, reclaiming some disk space. If no options are
13       specified, the default is --logs --download-cache --switch-cleanup.
14

OPTIONS

16       -a, --all-switches
17           Run the switch cleanup commands in all switches. Implies
18           --switch-cleanup
19
20       -c, --download-cache
21           Clear the cache of downloaded files ($OPAMROOT/download-cache), as
22           well as the obsolete $OPAMROOT/archives, if that exists.
23
24       --dry-run
25           Print the removal commands, but don't execute them
26
27       --logs
28           Clear the logs directory.
29
30       --no
31           Answer no to all opam yes/no questions without prompting. See also
32           --confirm-level. This is equivalent to setting $OPAMNO to "true".
33
34       -r, --repo-cache
35           Clear the repository cache. It will be rebuilt by the next opam
36           command that needs it.
37
38       -s, --switch-cleanup
39           Run the switch-specific cleanup: clears backups, build dirs,
40           uncompressed package sources of non-dev packages, local metadata of
41           previously pinned packages, etc.
42
43       --unused-repositories
44           Clear any configured repository that is not used by any switch nor
45           the default.
46
47       -y, --yes
48           Answer yes to all opam yes/no questions without prompting. See also
49           --confirm-level. This is equivalent to setting $OPAMYES to "true".
50

COMMON OPTIONS

52       These options are common to all commands.
53
54       --best-effort
55           Don't fail if all requested packages can't be installed: try to
56           install as many as possible. Note that not all external solvers may
57           support this option (recent versions of aspcud or mccs should).
58           This is equivalent to setting $OPAMBESTEFFORT environment variable.
59
60       --cli=MAJOR.MINOR (absent=2.1)
61           Use the command-line interface syntax and semantics of MAJOR.MINOR.
62           Intended for any persistent use of opam (scripts, blog posts,
63           etc.), any version of opam in the same MAJOR series will behave as
64           for the specified MINOR release. The flag was not available in opam
65           2.0, so to select the 2.0 CLI, set the OPAMCLI environment variable
66           to 2.0 instead of using this parameter.
67
68       --color=WHEN
69           Colorize the output. WHEN must be one of always, never or auto.
70
71       --confirm-level=LEVEL
72           Confirmation level, LEVEL must be one of ask, no, yes or
73           unsafe-yes. Can be specified more than once. If --yes or --no are
74           also given, the value of the last --confirm-level is taken into
75           account. This is equivalent to setting  $OPAMCONFIRMLEVEL`.
76
77       --criteria=CRITERIA
78           Specify user preferences for dependency solving for this run.
79           Overrides both $OPAMCRITERIA and $OPAMUPGRADECRITERIA. For details
80           on the supported language, and the external solvers available, see
81           http://opam.ocaml.org/doc/External_solvers.html. A general guide to
82           using solver preferences can be found at
83           http://www.dicosmo.org/Articles/usercriteria.pdf.
84
85       --cudf=FILENAME
86           Debug option: Save the CUDF requests sent to the solver to
87           FILENAME-<n>.cudf.
88
89       --debug
90           Print debug message to stderr. This is equivalent to setting
91           $OPAMDEBUG to "true".
92
93       --debug-level=LEVEL
94           Like --debug, but allows specifying the debug level (--debug sets
95           it to 1). Equivalent to setting $OPAMDEBUG to a positive integer.
96
97       --git-version
98           Print the git version of opam, if set (i.e. you are using a
99           development version), and exit.
100
101       --help[=FMT] (default=auto)
102           Show this help in format FMT. The value FMT must be one of auto,
103           pager, groff or plain. With auto, the format is pager or plain
104           whenever the TERM env var is dumb or undefined.
105
106       --ignore-pin-depends
107           Ignore extra pins required by packages that get pinned, either
108           manually through opam pin or through opam install DIR. This is
109           equivalent to setting IGNOREPINDEPENDS=true.
110
111       --json=FILENAME
112           Save the results of the opam run in a computer-readable file. If
113           the filename contains the character `%', it will be replaced by an
114           index that doesn't overwrite an existing file. Similar to setting
115           the $OPAMJSON variable.
116
117       --no-aspcud
118           Removed in 2.1.
119
120       --no-auto-upgrade
121           When configuring or updating a repository that is written for an
122           earlier opam version (1.2), opam internally converts it to the
123           current format. This disables this behaviour. Note that
124           repositories should define their format version in a 'repo' file at
125           their root, or they will be assumed to be in the older format. It
126           is, in any case, preferable to upgrade the repositories manually
127           using opam admin upgrade [--mirror URL] when possible.
128
129       --no-self-upgrade
130           Opam will replace itself with a newer binary found at OPAMROOT/opam
131           if present. This disables this behaviour.
132
133       -q, --quiet
134           Disables --verbose.
135
136       --root=ROOT
137           Use ROOT as the current root path. This is equivalent to setting
138           $OPAMROOT to ROOT.
139
140       --safe, --readonly
141           Make sure nothing will be automatically updated or rewritten.
142           Useful for calling from completion scripts, for example. Will fail
143           whenever such an operation is needed ; also avoids waiting for
144           locks, skips interactive questions and overrides the $OPAMDEBUG
145           variable. This is equivalent to set environment variable $OPAMSAFE.
146
147       --solver=CMD
148           Specify the CUDF solver to use for resolving package installation
149           problems. This is either a predefined solver (this version of opam
150           supports builtin-mccs+lp(), builtin-mccs+glpk,
151           builtin-dummy-z3-solver, builtin-dummy-0install-solver, aspcud,
152           mccs, aspcud-old, packup), or a custom command that should contain
153           the variables %{input}%, %{output}%, %{criteria}%, and optionally
154           %{timeout}%. This is equivalent to setting $OPAMEXTERNALSOLVER.
155
156       --strict
157           Fail whenever an error is found in a package definition or a
158           configuration file. The default is to continue silently if
159           possible.
160
161       --switch=SWITCH
162           Use SWITCH as the current compiler switch. This is equivalent to
163           setting $OPAMSWITCH to SWITCH.
164
165       --use-internal-solver
166           Disable any external solver, and use the built-in one (this
167           requires that opam has been compiled with a built-in solver). This
168           is equivalent to setting $OPAMNOASPCUD or $OPAMUSEINTERNALSOLVER.
169
170       -v, --verbose
171           Be more verbose. One -v shows all package commands, repeat to also
172           display commands called internally (e.g. tar, curl, patch etc.)
173           Repeating n times is equivalent to setting $OPAMVERBOSE to "n".
174
175       --version
176           Show version information.
177
178       -w, --working-dir
179           Whenever updating packages that are bound to a local,
180           version-controlled directory, update to the current working state
181           of their source instead of the last committed state, or the ref
182           they are pointing to. As source directory is copied as it is, if it
183           isn't clean it may result on a opam build failure.This only affects
184           packages explicitly listed on the command-line.It can also be set
185           with $OPAMWORKINGDIR.
186

ENVIRONMENT

188       Opam makes use of the environment variables listed here. Boolean
189       variables should be set to "0", "no", "false" or the empty string to
190       disable, "1", "yes" or "true" to enable.
191
192       OPAMALLPARENS surround all filters with parenthesis.
193
194       OPAMASSUMEDEPEXTS see option `--assume-depexts'.
195
196       OPAMAUTOREMOVE see remove option `--auto-remove'.
197
198       OPAMBESTEFFORT see option `--best-effort'.
199
200       OPAMBESTEFFORTPREFIXCRITERIA sets the string that must be prepended to
201       the criteria when the `--best-effort' option is set, and is expected to
202       maximise the `opam-query' property in the solution.
203
204       OPAMBUILDDOC Removed in 2.1.
205
206       OPAMBUILDTEST Removed in 2.1.
207
208       OPAMCLI see option `--cli'.
209
210       OPAMCOLOR when set to always or never, sets a default value for the
211       `--color' option.
212
213       OPAMCONFIRMLEVEL see option `--confirm-level`. OPAMCONFIRMLEVEL has
214       priority over OPAMYES and OPAMNO.
215
216       OPAMCRITERIA specifies user preferences for dependency solving. The
217       default value depends on the solver version, use `config report' to
218       know the current setting. See also option --criteria.
219
220       OPAMCUDFFILE save the cudf graph to file-actions-explicit.dot.
221
222       OPAMCUDFTRIM controls the filtering of unrelated packages during CUDF
223       preprocessing.
224
225       OPAMCURL can be used to select a given 'curl' program. See OPAMFETCH
226       for more options.
227
228       OPAMDEBUG see options `--debug' and `--debug-level'.
229
230       OPAMDEBUGSECTIONS if set, limits debug messages to the space-separated
231       list of sections. Sections can optionally have a specific debug level
232       (for example, CLIENT:2 or CLIENT CUDF:2), but otherwise use
233       `--debug-level'.
234
235       OPAMDIGDEPTH defines how aggressive the lookup for conflicts during
236       CUDF preprocessing is.
237
238       OPAMDOWNLOADJOBS sets the maximum number of simultaneous downloads.
239
240       OPAMDROPWORKINGDIR overrides packages previously updated with
241       --working-dir on update. Without this variable set, opam would keep
242       them unchanged unless explicitly named on the command-line.
243
244       OPAMDRYRUN see option `--dry-run'.
245
246       OPAMEDITOR sets the editor to use for opam file editing, overrides
247       $EDITOR and $VISUAL.
248
249       OPAMERRLOGLEN sets the number of log lines printed when a sub-process
250       fails. 0 to print all.
251
252       OPAMEXTERNALSOLVER see option `--solver'.
253
254       OPAMFAKE see option `--fake'.
255
256       OPAMFETCH specifies how to download files: either `wget', `curl' or a
257       custom command where variables %{url}%, %{out}%, %{retry}%,
258       %{compress}% and %{checksum}% will be replaced. Overrides the
259       'download-command' value from the main config file.
260
261       OPAMFIXUPCRITERIA same as OPAMUPGRADECRITERIA, but specific to fixup.
262
263       OPAMIGNORECONSTRAINTS see install option `--ignore-constraints-on'.
264
265       OPAMIGNOREPINDEPENDS see option `--ignore-pin-depends'.
266
267       OPAMINPLACEBUILD see option `--inplace-build'.
268
269       OPAMJOBS sets the maximum number of parallel workers to run.
270
271       OPAMJSON log json output to the given file (use character `%' to index
272       the files).
273
274       OPAMKEEPBUILDDIR see install option `--keep-build-dir'.
275
276       OPAMKEEPLOGS tells opam to not remove some temporary command logs and
277       some backups. This skips some finalisers and may also help to get more
278       reliable backtraces.
279
280       OPAMLOCKED combination of `--locked' and `--lock-suffix' options.
281
282       OPAMLOGS logdir sets log directory, default is a temporary directory in
283       /tmp
284
285       OPAMMAKECMD set the system make command to use.
286
287       OPAMMERGEOUT merge process outputs, stderr on stdout.
288
289       OPAMNO answer no to any question asked, see options `--no` and
290       `--confirm-level`. OPAMNO is ignored if either OPAMCONFIRMLEVEL or
291       OPAMYES is set.
292
293       OPAMNOAGGREGATE with `opam admin check', don't aggregate packages.
294
295       OPAMNOASPCUD Deprecated.
296
297       OPAMNOAUTOUPGRADE disables automatic internal upgrade of repositories
298       in an earlier format to the current one, on 'update' or 'init'.
299
300       OPAMNOCHECKSUMS enables option --no-checksums when available.
301
302       OPAMNODEPEXTS disables system dependencies handling, see option
303       `--no-depexts'.
304
305       OPAMNOENVNOTICE Internal.
306
307       OPAMNOSELFUPGRADE see option `--no-self-upgrade'
308
309       OPAMPINKINDAUTO sets whether version control systems should be detected
310       when pinning to a local path. Enabled by default since 1.3.0.
311
312       OPAMPRECISETRACKING fine grain tracking of directories.
313
314       OPAMPREPRO set this to false to disable CUDF preprocessing. Less
315       efficient, but might help debugging solver issue.
316
317       OPAMREQUIRECHECKSUMS Enables option `--require-checksums' when
318       available (e.g. for `opam install').
319
320       OPAMRETRIES sets the number of tries before failing downloads.
321
322       OPAMREUSEBUILDDIR see option `--reuse-build-dir'.
323
324       OPAMROOT see option `--root'. This is automatically set by `opam env
325       --root=DIR --set-root'.
326
327       OPAMROOTISOK don't complain when running as root.
328
329       OPAMSAFE see option `--safe'.
330
331       OPAMSHOW see option `--show'.
332
333       OPAMSKIPUPDATE see option `--skip-updates'.
334
335       OPAMSKIPVERSIONCHECKS bypasses some version checks. Unsafe, for
336       compatibility testing only.
337
338       OPAMSOLVERALLOWSUBOPTIMAL (default `true') allows some solvers to still
339       return a solution when they reach timeout; while the solution remains
340       assured to be consistent, there is no guarantee in this case that it
341       fits the expected optimisation criteria. If `true', opam willcontinue
342       with a warning, if `false' a timeout is an error. Currently only the
343       builtin-z3 backend handles this degraded case.
344
345       OPAMSOLVERTIMEOUT change the time allowance of the solver. Default is
346       60.0, set to 0 for unlimited. Note that all solvers may not support
347       this option.
348
349       OPAMSTATS display stats at the end of command.
350
351       OPAMSTATUSLINE display a dynamic status line showing what's currently
352       going on on the terminal. (one of one of always, never or auto)
353
354       OPAMSTRICT fail on inconsistencies (file reading, switch import, etc.).
355
356       OPAMSWITCH see option `--switch'. Automatically set by `opam env
357       --switch=SWITCH --set-switch'.
358
359       OPAMUNLOCKBASE see install option `--unlock-base'.
360
361       OPAMUPGRADECRITERIA specifies user preferences for dependency solving
362       when performing an upgrade. Overrides OPAMCRITERIA in upgrades if both
363       are set. See also option --criteria.
364
365       OPAMUSEINTERNALSOLVER see option `--use-internal-solver'.
366
367       OPAMUSEOPENSSL force openssl use for hash computing.
368
369       OPAMUTF8 use UTF8 characters in output (one of one of always, never or
370       auto). By default `auto', which is determined from the locale).
371
372       OPAMUTF8MSGS use extended UTF8 characters (camels) in opam messages.
373       Implies OPAMUTF8. This is set by default on OSX only.
374
375       OPAMVALIDATIONHOOK if set, uses the `%{hook%}' command to validate an
376       opam repository update.
377
378       OPAMVERBOSE see option `--verbose'.
379
380       OPAMVERSIONLAGPOWER do not use.
381
382       OPAMWITHDOC see install option `--with-doc'.
383
384       OPAMWITHTEST see install option `--with-test.
385
386       OPAMWORKINGDIR see option `--working-dir'.
387
388       OPAMYES see options `--yes' and `--confirm-level`. OPAMYES has has
389       priority over OPAMNO and is ignored if OPAMCONFIRMLEVEL is set.
390
391       OPAMVAR_var overrides the contents of the variable var when
392       substituting `%{var}%` strings in `opam` files.
393
394       OPAMVAR_package_var overrides the contents of the variable package:var
395       when substituting `%{package:var}%` strings in `opam` files.
396

CLI VERSION

398       All scripts and programmatic invocations of opam should use `--cli' in
399       order to ensure that they work seamlessly with future versions of the
400       opam client. Additionally, blog posts or other documentation can
401       benefit, as it prevents information from becoming stale.
402
403       Although opam only supports roots (~/.opam/) for the current version,
404       it does provide backwards compatibility for its command-line interface.
405
406       Since CLI version support was only added in opam 2.1, use OPAMCLI to
407       select 2.0 support (as opam 2.0 will just ignore it), and `--cli=2.1'
408       for 2.1 (or later) versions, since an environment variable controlling
409       the parsing of syntax is brittle. To this end, opam displays a warning
410       if OPAMCLI specifies a valid version other than 2.0, and also if
411       `--cli=2.0' is specified.
412
413       The command-line version is selected by using the `--cli' option or the
414       OPAMCLI environment variable. `--cli' may be specified morethan once,
415       where the last instance takes precedence. OPAMCLI is only inspected if
416       `--cli' is not given.
417

EXIT STATUS

419       As an exception to the following, the `exec' command returns 127 if the
420       command was not found or couldn't be executed, and the command's exit
421       value otherwise.
422
423       0   Success, or true for boolean queries.
424
425       1   False. Returned when a boolean return value is expected, e.g. when
426           running with --check, or for queries like opam lint.
427
428       2   Bad command-line arguments, or command-line arguments pointing to
429           an invalid context (e.g. file not following the expected format).
430
431       5   Not found. You requested something (package, version, repository,
432           etc.) that couldn't be found.
433
434       10  Aborted. The operation required confirmation, which wasn't given.
435
436       15  Could not acquire the locks required for the operation.
437
438       20  There is no solution to the user request. This can be caused by
439           asking to install two incompatible packages, for example.
440
441       30  Error in package definition, or other metadata files. Using
442           --strict raises this error more often.
443
444       31  Package script error. Some package operations were unsuccessful.
445           This may be an error in the packages or an incompatibility with
446           your system. This can be a partial error.
447
448       40  Sync error. Could not fetch some remotes from the network. This can
449           be a partial error.
450
451       50  Configuration error. Opam or system configuration doesn't allow
452           operation, and needs fixing.
453
454       60  Solver failure. The solver failed to return a sound answer. It can
455           be due to a broken external solver, or an error in solver
456           configuration.
457
458       99  Internal error. Something went wrong, likely due to a bug in opam
459           itself.
460
461       130 User interrupt. SIGINT was received, generally due to the user
462           pressing Ctrl-C.
463

FURTHER DOCUMENTATION

465       See https://opam.ocaml.org/doc.
466

AUTHORS

468       Vincent Bernardoff <vb@luminar.eu.org>
469       Raja Boujbel <raja.boujbel@ocamlpro.com>
470       Roberto Di Cosmo <roberto@dicosmo.org>
471       Thomas Gazagnaire <thomas@gazagnaire.org>
472       Louis Gesbert <louis.gesbert@ocamlpro.com>
473       Fabrice Le Fessant <Fabrice.Le_fessant@inria.fr>
474       Anil Madhavapeddy <anil@recoil.org>
475       Guillem Rieu <guillem.rieu@ocamlpro.com>
476       Ralf Treinen <ralf.treinen@pps.jussieu.fr>
477       Frederic Tuong <tuong@users.gforge.inria.fr>
478

BUGS

480       Check bug reports at https://github.com/ocaml/opam/issues.
481
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483
484Opam 2.1.5                                                       OPAM-CLEAN(1)
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