install.packages() returns a warning if a package cannot be installed (for instance, if it is unavailable); for example:
软件包()返回一个警告，如果软件包不能安装(例如，如果它不可用);例如:
install.packages("notapackage")
(EDIT: I'd like to throw an error regardless of the reason the package cannot be installed, not just this example case of a missing package).
(编辑:我想抛出一个错误，不管这个包无法安装的原因是什么，而不仅仅是这个丢失包的例子)。
I am running the install.packages command in a script, and I would like it to trigger a proper error and exit execution. I don't see an obvious option inside install.packages for handling this behavior. Any suggestions?
我正在运行安装。将命令打包到脚本中，我希望它触发一个正确的错误并退出执行。我在install中没有看到明显的选项。用于处理此行为的包。有什么建议吗?
2 个解决方案
#1
4
The R function WithCallingHandlers() lets us handle any warnings with an explicitly defined function. For instance, we can tell the R to stop if it receives any warnings (and return the warning message as an error message).
带有callinghandlers()的R函数允许我们使用显式定义的函数处理任何警告。例如，如果R收到任何警告，我们可以告诉它停止(并将警告消息作为错误消息返回)。
withCallingHandlers(install.packages("notapackage"),
warning = function(w) stop(w))
I am guessing that this is not ideal, since presumably a package could install successfully but still throw a warning; but haven't encountered that case. As Dirk suggests, testing require for the package is probably more robust.
我猜这并不理想，因为一个包可以成功安装，但仍然会抛出一个警告;但还没有遇到这种情况。正如Dirk所建议的，对包的测试要求可能更加健壮。
#2
0
Expanding on the quick comment:
扩展快速评论:
R> AP <- available.packages()
R> "notapackage" %in% AP[,1] # expected to yield FALSE
[1] FALSE
R> "digest" %in% AP[,1] # whereas this should be TRUE
[1] TRUE
R>
#1
4
The R function WithCallingHandlers() lets us handle any warnings with an explicitly defined function. For instance, we can tell the R to stop if it receives any warnings (and return the warning message as an error message).
带有callinghandlers()的R函数允许我们使用显式定义的函数处理任何警告。例如，如果R收到任何警告，我们可以告诉它停止(并将警告消息作为错误消息返回)。
withCallingHandlers(install.packages("notapackage"),
warning = function(w) stop(w))
I am guessing that this is not ideal, since presumably a package could install successfully but still throw a warning; but haven't encountered that case. As Dirk suggests, testing require for the package is probably more robust.
我猜这并不理想，因为一个包可以成功安装，但仍然会抛出一个警告;但还没有遇到这种情况。正如Dirk所建议的，对包的测试要求可能更加健壮。
#2
0
Expanding on the quick comment:
扩展快速评论:
R> AP <- available.packages()
R> "notapackage" %in% AP[,1] # expected to yield FALSE
[1] FALSE
R> "digest" %in% AP[,1] # whereas this should be TRUE
[1] TRUE
R>