Question

我正在尝试将timerep添加到现有应用程序中。我无法解决我的依赖关系。看起来它正在使用全局安装的time == 1.4.2版本，而>= 1.5对我的应用程序来说非常理想。

如何让cabal使用时间1.5？我已经通过unix，tls，process，timerep进行了调查，如果它只使用time >= 1.5，它们似乎都能正常工作。

这是错误：

serials> cabal install --only-dependencies
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: serials-0.1.0.2 (user goal)
trying: mandrill-0.2.2.0 (dependency of serials-0.1.0.2)
trying: http-client-tls-0.2.2 (dependency of mandrill-0.2.2.0)
trying: tls-1.2.17 (dependency of http-client-tls-0.2.2)
trying: x509-validation-1.5.2 (dependency of tls-1.2.17)
trying: process-1.2.0.0/installed-487... (dependency of x509-validation-1.5.2)
next goal: unix (dependency of process-1.2.0.0/installed-487...)
rejecting: unix-2.7.0.1/installed-299... (conflict: unix =>
time==1.4.2/installed-bf9..., serials => time>=1.5)
rejecting: unix-2.7.1.0, 2.7.0.1, 2.7.0.0, 2.6.0.1, 2.6.0.0, 2.5.1.1, 2.5.1.0,
2.5.0.0, 2.4.2.0, 2.4.1.0, 2.4.0.2, 2.4.0.1, 2.4.0.0, 2.3.2.0, 2.3.1.0,
2.3.0.0, 2.2.0.0, 2.0 (conflict: process => unix==2.7.0.1/installed-299...)
Dependency tree exhaustively searched.

Cabal file：

-- Initial serials.cabal generated by cabal init.  For further
-- documentation, see http://haskell.org/cabal/users-guide/

name:                serials
version:             0.1.0.2
synopsis:            serials
description:         serials
license:             MIT
license-file:        LICENSE
author:              Sean Hess
maintainer:          Sean Hess
-- copyright:
category:            Web Scraper
build-type:          Simple
extra-source-files:  README.md
cabal-version:       >=1.10
Source-repository head
  type:       git
  location:   git@github.com:seanhess/serials.git

executable serials
  main-is:             Main.hs
  hs-source-dirs:      server
  ghc-options:         -fcontext-stack=36
  -- other-modules:
  -- other-extensions:
  default-language:     Haskell2010
  build-depends:
    base >=4.7 && <5,
    tagsoup,
    text,
    scalpel,
    containers,
    network-uri,
    monad-loops,
    wreq,
    lens,
    bytestring,
    parsec,
    utf8-string,
    tagsoup,
    xml,
    feed,
    regex-pcre,
    aeson,
    network,
    wai,
    wai-extra,
    wai-cors,
    wai-middleware-static,
    warp,
    servant-server >= 0.4,
    rethinkdb >= 1.16,
    transformers,
    either,
    unordered-containers,
    mtl,
    http-types,
    safe,
    hashable,
    resource-pool,
    time >= 1.5,
    pooled-io,
    shelly,
    string-conversions,
    bcrypt,
    random,
    jwt,
    cookie,
    entropy,
    mandrill == 0.2.2.0,
    email-validate,
    blaze-markup,
    blaze-html,
    iso8601-time,
    scotty == 0.10.0,
    timerep >= 2.0.0

Answer 1

cabal-install很难完整地描述安装问题的相互不兼容性。相反，它决定打印失败的第一条路径。

但是，它会打印Dependency tree exhaustively searched.，表示实际上没有针对给定问题的解决方案。

通常有用的一件事是查看cabal-install所做的选择，找到一个看起来不理想的选项，然后添加一个显式约束来改变它。这可能会导致更好的错误消息。

让我们试试[请注意，我不确定我是否拥有与您相同的软件包数据库，因此可能会在您的系统上产生不同的结果]。

你有（已安装软件包的模数）：

$ cabal install --only-dependencies
Resolving dependencies...
cabal: Could not resolve dependencies:
trying: serials-0.1.0.2 (user goal)
trying: mandrill-0.2.2.0 (dependency of serials-0.1.0.2)
trying: http-client-tls-0.2.2 (dependency of mandrill-0.2.2.0)
trying: tls-1.2.17 (dependency of http-client-tls-0.2.2)
trying: x509-validation-1.5.2 (dependency of tls-1.2.17)
trying: process-1.2.0.0/installed-06c... (dependency of x509-validation-1.5.2)
next goal: unix (dependency of process-1.2.0.0/installed-06c...)
rejecting: unix-2.7.0.1/installed-f86... (conflict: unix =>
time==1.4.2/installed-9b3..., serials => time>=1.5)
rejecting: unix-2.7.1.0, 2.7.0.1, 2.7.0.0, 2.6.0.1, 2.6.0.0, 2.5.1.1, 2.5.1.0,
2.5.0.0, 2.4.2.0, 2.4.1.0, 2.4.0.2, 2.4.0.1, 2.4.0.0, 2.3.2.0, 2.3.1.0,
2.3.0.0, 2.2.0.0, 2.0 (conflict: process => unix==2.7.0.1/installed-f86...)
Dependency tree exhaustively searched.

仔细观察，unix发生了错误，process是process的依赖关系。因此，选择process的已安装实例会导致问题。那么，如果我们不允许选择$ cabal install --only-dependencies --constraint="process source" Resolving dependencies... cabal: Could not resolve dependencies: trying: serials-0.1.0.2 (user goal) next goal: time (dependency of serials-0.1.0.2) rejecting: time-1.4.2/installed-9b3... (conflict: serials => time>=1.5) trying: time-1.5.0.1 next goal: rethinkdb (dependency of serials-0.1.0.2) rejecting: rethinkdb-1.16.0.0 (conflict: time==1.5.0.1, rethinkdb => time==1.4.*) rejecting: rethinkdb-1.15.2.1, 1.15.2.0, 1.15.1.0, 1.15.0.0, 1.8.0.5, 1.8.0.4, 1.8.0.3, 1.8.0.2, 1.8.0.1, 1.8.0.0, 0.1.0.0 (conflict: serials => rethinkdb>=1.16) Dependency tree exhaustively searched.的实例？

，该怎么办？

rethinkdb

啊哈！因此serials（time == 1.4.*的直接依赖关系serials明确依赖time >= 1.5。这与rethinkdb对time的依赖性直接冲突。

这不容易修复。您需要serials使用较新的rethinkdb库，或time使用旧版本。

我们现在进入推测领域：$ cabal install --only-dependencies --allow-newer=time实际上可以使用较新版本的Criteria criteria = HibernateUtil.getCurrentSession() .createCriteria(AttributeGroup.class) .createCriteria("attributes").setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY);，但不能保证。我们可以尝试指示cabal-install考虑这样的安装计划：

createCriteria

这实际上会在我的机器上产生安装计划。我没有尝试构建它，我也不知道它是否有效。但值得一试。

Cabal沙箱使用全局依赖。无法解决

1 个答案: