58 lines
1.3 KiB
Markdown
58 lines
1.3 KiB
Markdown
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---
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title: "Makefile Patterns"
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tags: [ "system", "makefiles" ]
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---
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Using the [basic example](../Makefile.md), you can make a complete backup of all backup files.
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This file will depend upon everything inside the `$(storage_directory)`.
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Unlike `bash`, you can't just say `storage_directory/*`: the pattern must be stated as a 'wildcard'.
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```make
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$(storage_directory)/backup.tgz: $(wildcard $(storage_directory)/*.md)
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tar czf $@ $^
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```
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The `make` rules start by processing variables:
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```make
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backups/backup.tgz: $(wildcard backups/*.md)
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tar czf backups/backup.tgz $^
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```
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Then the `wildcard` variable equals whichever backup files are in the `backups/` directory:
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```make
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backups/backup.tgz: backups/backup_29.md backups/backup_30.md
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tar czf backups/backup.tgz backups/backup_29.md backups/backup_30.md
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```
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The phony `backup` target should now point to this tar backup.
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```make
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current_minute != date +%M
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storage_directory = backups
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.PHONY: backup
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backup: $(storage_directory)/backup.tgz
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$(storage_directory)/backup.tgz: $(wildcard $(storage_directory)/*.md)
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tar czf $@ $^
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README.md: Makefile
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echo "Basic makefile example." > $@
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echo "" >> $@
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echo '```' >> $@
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cat $< >> $@
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echo '```' >> $@
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$(storage_directory)/backup_$(current_minute).md: README.md
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mkdir -p $(@D)
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cp $< $@
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```
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