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I have a directory images/ that I want to copy to build/images/ from within a Makefile. The directory might contain multiple levels of subdirectories. What would be the most elegant way to do that? I want:
make run (i.e. no cp -r)images/ it should be automatically updated in build/images/)make, so no rsync or cp -u if possibleI am using GNU make, so GNU specific stuff is allowed.
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In order to copy a directory on Linux, you have to execute the “cp” command with the “-R” option for recursive and specify the source and destination directories to be copied.
Yes, a Makefile can have a directory as target. Your problem could be that the cd doesn't do what you want: it does cd and the git clone is carried out in the original directory (the one you cd ed from, not the one you cd ed to). This is because for every command in the Makefile an extra shell is created.
cp copies files (or, optionally, directories). The copy is completely independent of the original. You can either copy one file to another, or copy arbitrarily many files to a destination directory.
Use cp followed by the file you want to copy and the destination where you want it moved. That, of course, assumes that your file is in the same directory you're working out of. You can specify both. You also have the option of renaming your file while copying it.
Well, I'd just use rsync. Any make script you will create with these constraints will just replicate its functionality, and most probably will be slower and may contain bugs. An example rule might look:
build/images: rsync -rupE images build/ .PHONY: build/images (.PHONY to trigger the rule every time).
Maybe symlinks or hardlinks can be used instead?
build/images: ln -s ../images build/images If you really want to avoid rsync and links, this piece re-implements them somehow (not tested, needs find, mkdir, and plain cp):
image_files:=$(shell find images -type f) build/images/%: images/% mkdir -p $(@D) cp $< $@ build: $(patsubst %,build/%,$(image_files)) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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