06a75a7e0c
of the current profile, e.g.,
$ nix-env --list-generations
...
39 2004-02-02 17:53:53
40 2004-02-02 17:55:18
41 2004-02-02 17:55:41
42 2004-02-02 17:55:50 (current)
$ nix-env --switch-generation 39
$ ls -l /nix/var/nix/profiles/default
... default -> default-39-link
* Also a command `--rollback' which is just a convenience operation to
rollback to the oldest generation younger than the current one.
Note that generations properly form a tree. E.g., if after
switching to generation 39, we perform an installation action,
a generation 43 is created which is a descendant of 39, not 42. So
a rollback from 43 ought to go back to 39. This is not currently
implemented; generations form a linear sequence.
36 lines
633 B
C++
36 lines
633 B
C++
#ifndef __PROFILES_H
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#define __PROFILES_H
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#include <string>
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#include "util.hh"
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struct Generation
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{
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int number;
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Path path;
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time_t creationTime;
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Generation()
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{
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number = -1;
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}
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operator bool() const
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{
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return number != -1;
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}
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};
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typedef list<Generation> Generations;
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/* Returns the list of currently present generations for the specified
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profile, sorted by generation number. */
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Generations findGenerations(Path profile, int & curGen);
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Path createGeneration(Path profile, Path outPath, Path drvPath);
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void switchLink(Path link, Path target);
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#endif /* !__PROFILES_H */
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