man opam-update (1): Update the list of available packages.

SYNOPSIS

opam update [OPTION]... [NAMES]...

DESCRIPTION

This command updates each repository that has been previously set up by the opam init or opam repository commands. The list of packages that can be upgraded will be printed out, and the user can use opam upgrade to upgrade them.

ARGUMENTS

NAMES: List of repository or development package names.

OPTIONS

-j JOBS, --jobs=JOBS: Set the maximal number of concurrent jobs to use. You can also set it using the $OPAMJOBS environment variable.
--json=FILENAME: Save the result output of an OPAM run in a computer-readable file
-R, --repositories: Only update repositories, not development packages.
--sync-archives: Always sync the remote archives files. This is not a good idea to enable this, unless your really know what your are doing: this flag will make OPAM try to download the archive files for ALL the available packages.
-u, --upgrade: Automatically run opam upgrade after the update.

COMMON OPTIONS

These options are common to all commands.

--color=WHEN (absent=auto): Colorize the output. WHEN must be `always', `never' or `auto'.
--compat-mode-1.0: Compatibility mode with OPAM 1.0
--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),-count(new) for upgrades, and -count(removed),-notuptodate(request),-count(down),-notuptodate(changed),-count(changed),-notuptodate(solution) 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
--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 output of all sub-commands. This is equivalent to setting $OPAMVERBOSE to "true".
--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),-count(down),-notuptodate(changed),-count(changed),-notuptodate(solution). See also option --criteria

OPAMCURL can be used to define an alternative for the 'curl' command-line utility to download files.

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

OPAMEXTERNALSOLVER see option `--solver'.

OPAMJOBS sets the maximum number of parallel workers to run.

OPAMNOASPCUD see option `--no-aspcud'.

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

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

OPAMSOLVERTIMEOUT change the time allowance of the internal solver.

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),-count(new). See also option --criteria

OPAMUTF8MSGS use nice UTF8 characters in OPAM messages.

OPAMVERBOSE see option `--verbose'.

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.

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

OPAMYES see option `--yes'.