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Implement alternative to lazy generations:

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* only the last generation can be lazy
* depend on the '--lazy-generation' flag to be set
This commit is contained in:
Christian Theune 2015-05-19 20:03:36 +02:00
parent 3d83188702
commit ea39c98d41
6 changed files with 39 additions and 21 deletions
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19
src/nix-env/profiles.cc
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@ -74,7 +74,7 @@ static void makeName(const Path & profile, unsigned int num,
}
Path createGeneration(Path profile, Path outPath)
Path createGeneration(Path profile, Path outPath, bool lazy)
{
/* The new generation number should be higher than old the
previous ones. */
@ -83,13 +83,16 @@ Path createGeneration(Path profile, Path outPath)
unsigned int num;
if (gens.size() > 0) {
/* Check existing generations whether they represent an
environment we already materialized before. In that case:
avoid cluttering the system with additional symlinks. */
for (auto & gen : gens) {
if (readLink(gen.path) == outPath) {
return gen.path;
}
Generation last = gens.back();
if (lazy && readLink(last.path) == outPath) {
/* If lazy generations are enabled then we only create a
new generation symlink if it differs from the last one.
This helps keeping gratuitous installs/rebuilds from piling
up uncontrolled numbers of generations, cluttering up the
UI like grub. */
return last.path;
}
num = gens.back().number;