Cabal 沙箱正在使用全局依赖项。无法解决
Cabal sandbox is using a global dependency. Could not resolve
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 time == 1.4.2 的全局安装版本，而 >= 1.5 对我的应用程序来说是理想的。
如何让 cabal 使用 time 1.5？我浏览了 unix、tls、process、timerep，如果只使用 time >= 1.5.
，它们似乎都可以正常工作
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.
-- 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
cabal-install 很难对安装问题的相互不兼容性进行完整的描述。相反，它决定打印第一条失败路径。
但是，它打印 Dependency tree exhaustively searched.，这表明实际上没有解决给定问题的方法。
通常有帮助的一件事是查看 cabal-install 所做的选择，找到一个似乎次优的选择，然后添加一个明确的约束来改变它。这可能会产生更好的错误消息。
让我们尝试一下[请注意，我不确定我是否拥有与您完全相同的包数据库，因此它可能会在您的系统上产生不同的结果]。
你有（已安装包的模散列）：
$ 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.
仔细查看，错误发生在 unix，它是 process 的依赖项。因此，选择 process 的已安装实例会导致麻烦。那么，如果我们不允许选择 process 的那个实例呢？
$ 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.
啊哈！因此 rethinkdb 是 serials 的直接依赖项，它显式依赖于 time == 1.4.*。这与 serials 对 time >= 1.5.
的依赖直接冲突
这不容易解决。您要么需要使 rethinkdb 使用较新的 time 库，要么 serials 使用较旧的库。
我们现在进入推测领域：有可能，但不能保证，rethinkdb 实际上可以与更新版本的 time 一起使用。我们可以尝试让cabal-install考虑这样的安装方案：
$ cabal install --only-dependencies --allow-newer=time
这实际上会在我的机器上产生一个安装计划。我没有尝试构建它，我不知道它是否有效。但它可能值得一试。
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 time == 1.4.2 的全局安装版本，而 >= 1.5 对我的应用程序来说是理想的。
如何让 cabal 使用 time 1.5？我浏览了 unix、tls、process、timerep，如果只使用 time >= 1.5.
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.
-- 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
cabal-install 很难对安装问题的相互不兼容性进行完整的描述。相反，它决定打印第一条失败路径。
但是，它打印 Dependency tree exhaustively searched.，这表明实际上没有解决给定问题的方法。
通常有帮助的一件事是查看 cabal-install 所做的选择，找到一个似乎次优的选择，然后添加一个明确的约束来改变它。这可能会产生更好的错误消息。
让我们尝试一下[请注意，我不确定我是否拥有与您完全相同的包数据库，因此它可能会在您的系统上产生不同的结果]。
你有（已安装包的模散列）：
$ 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.
仔细查看，错误发生在 unix，它是 process 的依赖项。因此，选择 process 的已安装实例会导致麻烦。那么，如果我们不允许选择 process 的那个实例呢？
$ 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.
啊哈！因此 rethinkdb 是 serials 的直接依赖项，它显式依赖于 time == 1.4.*。这与 serials 对 time >= 1.5.
这不容易解决。您要么需要使 rethinkdb 使用较新的 time 库，要么 serials 使用较旧的库。
我们现在进入推测领域：有可能，但不能保证，rethinkdb 实际上可以与更新版本的 time 一起使用。我们可以尝试让cabal-install考虑这样的安装方案：
$ cabal install --only-dependencies --allow-newer=time
这实际上会在我的机器上产生一个安装计划。我没有尝试构建它，我不知道它是否有效。但它可能值得一试。