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https://issues.apache.org/jira/browse/CB-11117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15264988#comment-15264988
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ASF GitHub Bot commented on CB-11117:
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Github user jasongin commented on the pull request:
https://github.com/apache/cordova-lib/pull/429#issuecomment-215911697
@nikhilkh As we discussed, this workaround was the best I could find. The
command script approach has similar performance to just copying files via the
node fs APIs, and it correctly copies the file times, enabling incremental
builds to work correctly. My biggest remaining concern is any errors during the
copy will not pinpoint a specific file, but that should be an extremely rare
issue.
I also tried using a generated PowerShell script to just update the file
times after copying in nodejs, but that was too slow, both in PS startup cost
and per-file cost.
> Preparing platforms should skip copying files which haven't changed
> -------------------------------------------------------------------
>
> Key: CB-11117
> URL: https://issues.apache.org/jira/browse/CB-11117
> Project: Apache Cordova
> Issue Type: Improvement
> Components: Android, iOS, Windows
> Reporter: Jason Ginchereau
> Assignee: Jason Ginchereau
>
> Many cordova CLI commands include a "prepare" operation, including 'cordova
> build', 'cordova run', 'cordova plugin add', and more. Every time each of
> those commands runs, the target platform is "prepared", which involves
> copying all files from the [<project>/www,
> <project>/platforms/<platform>/platform_www, <project>/merges/<platform>] to
> the platform's target www folder, as well as copying a bunch of icons and
> splash screens to platform-specific locations.
> For the very first prepare of a platform, all that file copying is necessary.
> But most of the time after that most of the files being copied have not
> changed and therefore don't really need to be copied again. So the typical
> developer inner loop (edit a few source files, build and run the app, repeat)
> is a lot slower than it could be for a Cordova project, especially one that
> includes a significant number of source files or resources.
> Instead, Cordova should be smart enough to skip copying of files that haven't
> changed, based on their last-modified timestamp. (But also there should still
> be a way to force a clean/full/non-incremental build if desired.)
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