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Diffstat (limited to 'doc/guix.texi')
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diff --git a/doc/guix.texi b/doc/guix.texi index 633d62bd98..e09083c1f8 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -5070,6 +5070,23 @@ opens the door to security vulnerabilities. @xref{Invoking guix pull, @option{--allow-downgrades}}. @end quotation +Due to @command{guix time-machine} relying on the ``inferiors'' +mechanism (@pxref{Inferiors}), the oldest commit it can travel to is +commit @samp{6298c3ff} (``v1.0.0''), dated May 1@sup{st}, 2019, which is +the first release that included the inferiors mechanism. An error is +returned when attempting to navigate to older commits. + +@quotation Note +Although it should technically be possible to travel to such an old +commit, the ease to do so will largely depend on the availability of +binary substitutes. When traveling to a distant past, some packages may +not easily build from source anymore. One such example are old versions +of Python 2 which had time bombs in its test suite, in the form of +expiring SSL certificates. This particular problem can be worked around +by setting the hardware clock to a value in the past before attempting +the build. +@end quotation + The general syntax is: @example |