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system: vm: Use 2^32 - 1 as hash size.

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* gnu/system/vm.scm (operating-system-uuid): Use 2^32 - 1 instead of
  2^32 as hash size.

On some 32 bit system (ARM for example), 2^32 exceeds hash max
size (ULONG_MAX = 2^32 - 1).
This commit is contained in:
Mathieu Othacehe 2017-11-03 13:40:07 +01:00
parent dd208b936c
commit b1a3079347
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1 changed files with 4 additions and 4 deletions
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gnu/system/vm.scm
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@ -372,13 +372,13 @@ TYPE (one of 'iso9660 or 'dce). Return a UUID object."
(bytevector->uuid
(uint-list->bytevector
(list (hash file-system-type
(expt 2 32))
(- (expt 2 32) 1))
(hash (operating-system-host-name os)
(expt 2 32))
(- (expt 2 32) 1))
(hash (operating-system-services os)
(expt 2 32))
(- (expt 2 32) 1))
(hash (operating-system-file-systems os)
(expt 2 32)))
(- (expt 2 32) 1)))
(endianness little)
4)
type)))