doc: Add example of VCS-snapshot version numbers.

* doc/guix.texi (Version Numbers): Add example for VCS version numbers.
This commit is contained in:
Ludovic Courtès 2016-02-23 12:44:43 +01:00
parent 5a179844e7
commit 561360a589

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