Something I have noticed just now with the new "guix pull", but which also happens with regular profiles through "guix package": Sometimes (always?) unchanged profiles are created with a new number.
For instance, here is the result of three "guix pull" in my profile: $ guix pull -l Generation 1 Jul 22 2018 23:47:42 guix 9f2adb2 repository URL: https://git.savannah.gnu.org/git/guix.git branch: origin/master commit: 9f2adb2f19db6d2e2234df15b0e24c5d01b9181c Generation 2 Jul 23 2018 14:43:30 guix fef7bab repository URL: https://git.savannah.gnu.org/git/guix.git branch: origin/master commit: fef7baba786a96b7a3100c9c7adf8b45782ced37 1 new package: guile-pfds 6 packages upgraded: c-toxcore@0.2.4, hyperrogue@10.4j, qtox@1.16.3, wine-staging-patchset-data@3.13, wine-staging@3.13, wine64-staging@3.13 Generation 3 Jul 23 2018 14:59:55 (aktuell) guix fef7bab repository URL: https://git.savannah.gnu.org/git/guix.git branch: origin/master commit: fef7baba786a96b7a3100c9c7adf8b45782ced37 The third generation is identical to the second one and should not have been created. Andreas