NAME

       opam-pin - Pin a given package to a specific version or source.

SYNOPSIS

       opam pin [OPTION]... [COMMAND] [ARG]...

DESCRIPTION

       This command allows local customisation of the packages in a given switch. A package can
       be pinned to a specific upstream version, to a path containing its source, to a
       version-controlled location or to a URL. If a file `NAME.opam' with NAME matching the
       package name, or just `opam', is found at the root of the pinned source, it will be used
       as the package's definition, overriding its previous definition if any. If a directory by
       one of these names is found, its contents will be used, also overriding other package
       metadata (`descr', extra `files' subdirectory...)

COMMANDS

       Without argument, defaults to list.

       list
           Lists pinned packages.

       add PACKAGE TARGET
           Pins package PACKAGE to TARGET, which may be a version, a path, or a URL. PACKAGE can
           be omitted if TARGET is a local path containing a package description with a name.
           TARGET can be replaced by `--dev-repo' if a package by that name is already known.
           OPAM will infer the kind of pinning from the format of TARGET, using path pinning by
           default, unless you use an explicit --kind option. Pins to version control systems may
           target a specific branch or commit using #branch e.g. git://host/me/pkg#testing. When
           they don't, in the special case of version-controlled pinning to a local path, OPAM
           will use "mixed mode": it will only use version-controlled files, but at their
           current, on-disk version. If PACKAGE is not a known package name, a new package by
           that name will be locally created. The package version may be specified by using the
           format NAME.VERSION for PACKAGE, in the source opam file, or with edit.

       remove NAMES
           Unpins packages NAMES, restoring their definition from the repository, if any.

       edit NAME
           Opens an editor giving you the opportunity to change the opam file that OPAM will
           locally use for pinned package NAME, including its version. To simply change the
           pinning target, use add. The chosen editor is determined from environment variables
           OPAM_EDITOR, VISUAL or EDITOR, in order.

OPTIONS

       --dev-repo
           Pin to the upstream package source for the latest development version

       -e, --edit
           With opam pin add, edit the opam file as with `opam pin edit' after pinning.

       -k KIND, --kind=KIND
           Sets the kind of pinning. Must be one of one of `version', `path', `http', `git',
           `darcs', `hg' or `auto'. If unset, is inferred from the format of the target,
           defaulting to path. If auto or OPAMPINKINDAUTO is set, a local path will be searched
           for version control and the pinning kind set accordingly. This is expected to become
           the default in a next version.

       -n, --no-action
           Just record the new pinning status, and don't prompt for (re)installation or removal
           of affected packages.

       -s, --short
           Output raw lists of names, one per line, skipping any details.

COMMON OPTIONS

       These options are common to all commands.

       --color=WHEN (absent=auto)
           Colorize the output. WHEN must be one of `always', `never' or `auto'.

       --criteria=CRITERIA
           Specify user preferences for dependency solving for this run. Overrides both
           $OPAMCRITERIA and $OPAMUPGRADECRITERIA. For details on the supported language, and the
           external solvers available, see
           http://opam.ocaml.org/doc/Specifying_Solver_Preferences.html. A general guide to using
           solver preferences can be found at  http://www.dicosmo.org/Articles/usercriteria.pdf.
           The default value is
           -count(down),-count(removed),-notuptodate(solution),-sum(solution,version-lag),-count(new)
           for upgrades, and
           -count(removed),-notuptodate(request),-sum(request,version-lag),-count(down),-notuptodate(changed),-count(changed),-notuptodate(solution),-sum(solution,version-lag)
           otherwise.

       --cudf=FILENAME
           Debug option: Save the CUDF requests sent to the solver to FILENAME-<n>.cudf.

       --debug
           Print debug message to stderr. This is equivalent to setting $OPAMDEBUG to "true".

       --debug-level=LEVEL
           Like `--debug', but allows specifying the debug level (`--debug' sets it to 1).
           Equivalent to setting $OPAMDEBUG to a positive integer.

       --git-version
           Print the git version if it exists and exit.

       --help[=FMT] (default=pager)
           Show this help in format FMT (pager, plain or groff).

       --no-base-packages
           Do not install base packages (useful for testing purposes). This is equivalent to
           setting $OPAMNOBASEPACKAGES to a non-empty string.

       --no-self-upgrade
           OPAM will replace itself with a newer binary found at OPAMROOT/opam if present. This
           disables this behaviour.

       -q, --quiet
           Be quiet when installing a new compiler.

       --root=ROOT (absent=~/.opam)
           Use ROOT as the current root path. This is equivalent to setting $OPAMROOT to ROOT.

       --safe
           Make sure nothing will be automatically updated or rewritten. Useful for calling from
           completion scripts, for example. Will fail whenever such an operation is needed ; also
           avoids waiting for locks, skips interactive questions and overrides the OPAMDEBUG
           variable.

       --solver=CMD
           Specify the name of the external dependency solver. The default value is aspcud.
           Either 'aspcud', 'packup' or a custom command that may contain the variables
           %{input}%, %{output}% and %{criteria}%

       --strict
           Fail whenever an error is found in a package definition or a configuration file. The
           default is to continue silently if possible.

       --switch=SWITCH
           Use SWITCH as the current compiler switch. This is equivalent to setting $OPAMSWITCH
           to SWITCH.

       --use-internal-solver, --no-aspcud
           Force use of internal heuristics, even if an external solver is available.

       -v, --verbose
           Be more verbose, show package sub-commands and their output. Repeat to see more.
           Repeating n times is equivalent to setting $OPAMVERBOSE to "n".

       --version
           Show version information.

       -y, --yes
           Disable interactive mode and answer yes to all questions that would otherwise be asked
           to the user. This is equivalent to setting $OPAMYES to "true".

ENVIRONMENT VARIABLES

       OPAM makes use of the environment variables listed here. Boolean variables should be set
       to "0", "no" of "false" to disable, "1", "yes" or "true" to enable.

       OPAMCOLOR, when set to always or never, sets a default value for the --color option.

       OPAMCRITERIA specifies user preferences for dependency solving.The default value is
       -count(removed),-notuptodate(request),-sum(request,version-lag),-count(down),-notuptodate(changed),-count(changed),-notuptodate(solution),-sum(solution,version-lag).
       See also option --criteria

       OPAMCURL can be used to select a given 'curl' program. See OPAMFETCH for more options.

       OPAMDEBUG see options `--debug' and `--debug-level'.

       OPAMDOWNLOADJOBS sets the maximum number of simultaneous downloads.

       OPAMEXTERNALSOLVER see option `--solver'.

       OPAMFETCH specifies how to download files: either `wget', `curl' or a custom command where
       variables %{url}%, %{out}%, %{retries}%, %{compress}% and %{checksum}% will be replaced.
       Overrides the 'download-command' value from the main config file.

       OPAMJOBS sets the maximum number of parallel workers to run.

       OPAMLOCKRETRIES sets the number of tries after which OPAM gives up acquiring its lock and
       fails. <= 0 means infinite wait.

       OPAMNO answer no to any question asked.

       OPAMNOASPCUD see option `--no-aspcud'.

       OPAMNOSELFUPGRADE see option `--no-self-upgrade'.

       OPAMPINKINDAUTO if set, version control systems are detected when pinning to a local path.

       OPAMREQUIRECHECKSUMS see option `--require-checksums'.

       OPAMRETRY sets the number of tries before failing downloads.

       OPAMROOT see option `--root'. This is automatically set by `opam config env --root=DIR'
       when DIR is non-default or OPAMROOT is already defined.

       OPAMSAFE see option `--safe'

       OPAMSKIPVERSIONCHECKS bypasses some version checks. Unsafe, for compatibility testing
       only.

       OPAMSOLVERTIMEOUT change the time allowance of the internal solver.

       OPAMSTATUSLINE display a dynamic status line showing what's currently going on on the
       terminal. (one of one of `always', `never' or `auto')

       OPAMSWITCH see option `--switch'. Automatically set by `opam config env --switch=SWITCH'.

       OPAMUPGRADECRITERIA specifies user preferences for dependency solving when performing an
       upgrade. Overrides OPAMCRITERIA in upgrades if both are set.The default value is
       -count(down),-count(removed),-notuptodate(solution),-sum(solution,version-lag),-count(new).
       See also option --criteria

       OPAMUSEINTERNALSOLVER see option `--use-internal-solver'.

       OPAMUTF8 use UTF8 characters in output (one of one of `always', `never' or `auto'). By
       default `auto', which is determined from the locale).

       OPAMUTF8MSGS use extended UTF8 characters (camels) in OPAM messages. Implies OPAMUTF8.
       This is set by default on OSX only.

       OPAMVAR_var overrides the contents of the variable var when substituting `%{var}%` strings
       in `opam` files.

       OPAMVAR_package_var overrides the contents of the variable package:var when substituting
       `%{package:var}%` strings in `opam` files.

       OPAMVERBOSE see option `--verbose'.

       OPAMYES see option `--yes'.

FURTHER DOCUMENTATION

       See https://opam.ocaml.org.

AUTHORS

       Thomas Gazagnaire <thomas@gazagnaire.org>
       Anil Madhavapeddy <anil@recoil.org>
       Fabrice Le Fessant <Fabrice.Le_fessant@inria.fr>
       Frederic Tuong <tuong@users.gforge.inria.fr>
       Louis Gesbert <louis.gesbert@ocamlpro.com>
       Vincent Bernardoff <vb@luminar.eu.org>
       Guillem Rieu <guillem.rieu@ocamlpro.com>
       Roberto Di Cosmo <roberto@dicosmo.org>

BUGS

       Check bug reports at https://github.com/ocaml/opam/issues.