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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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18
tests/user-envs.sh
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@ -99,14 +99,24 @@ if nix-env -q '*' | grep -q bar; then false; fi
nix-env --list-generations
test "$(nix-env --list-generations | wc -l)" -eq 7
# Doing the same operation twice should result in the same generation, not an
# additional one. At this point we just brought back foo. Installing it again
# should not create a new generation.
# Doing the same operation twice results in the same generation, but creates an
# additional one. At this point we just brought back foo.
nix-env -i foo
# Count generations.
nix-env --list-generations
test "$(nix-env --list-generations | wc -l)" -eq 7
test "$(nix-env --list-generations | wc -l)" -eq 8
# Now, doing that again but passing the --lazy-generations flag will not
# create a new generation.
nix-env -i foo --lazy-generation
# Count generations.
nix-env --list-generations
test "$(nix-env --list-generations | wc -l)" -eq 8
# Switch to a specified generation.
nix-env --switch-generation 7