doc: Add example of VCS-snapshot version numbers.
* doc/guix.texi (Version Numbers): Add example for VCS version numbers.
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@ -10456,7 +10456,26 @@ field to, say, 7 digits. It avoids an aesthetic annoyance (assuming
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aesthetics have a role to play here) as well as problems related to OS
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limits such as the maximum shebang length (127 bytes for the Linux
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kernel.) It is best to use the full commit identifiers in
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@code{origin}s, though, to avoid ambiguities.
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@code{origin}s, though, to avoid ambiguities. A typical package
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definition may look like this:
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@example
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(define my-package
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(let ((commit "c3f29bc928d5900971f65965feaae59e1272a3f7"))
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(package
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(version (string-append "0.9-1."
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(string-take commit 7)))
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(source (origin
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(method git-fetch)
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(uri (git-reference
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(url "git://example.org/my-package.git")
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(commit commit)))
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(sha256 (base32 "1mbikn@dots{}"))
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(file-name (string-append "my-package-" version
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"-checkout"))))
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;; @dots{}
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)))
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@end example
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@node Synopses and Descriptions
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@subsection Synopses and Descriptions
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