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Back in 2013, update-mime-database started using fdatasync() to write out its changes after processing each file in /share/mime, with the reasoning that a corrupted database from an interruption midway would be problematic for applications[1]. Unfortunately, this caused a significant regression in the time required to run update-mime-database: commonly from under a second to half a minute or more. This delay affects the time required to build system-path on NixOS, when xdg.mime.enable is true (the default). For example, on one of my systems system-path builds in ~48 seconds, 45 of which are update-mime-database. This makes rapidly building new system configurations not fun. This commit disables the calls to fdatasync(). update-mime-database checks an environment variable, PKGSYSTEM_ENABLE_FSYNC, to determine whether it should sync, and we can set this to false. system-path already only has whatever filesystem commit guarantees that the Nix builder provides. Furthermore, there is no risk of a failed MIME database update messing up existing packages, because this is Nix. (This issue was also reported at and discussed by Debian, Red Hat, and Gentoo at least.) [1] https://bugs.freedesktop.org/show_bug.cgi?id=70366 |
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| .. | ||
| fonts | ||
| gtk | ||
| krb5 | ||
| xdg | ||
| appstream.nix | ||
| debug-info.nix | ||
| gnu.nix | ||
| i18n.nix | ||
| iproute2.nix | ||
| ldap.nix | ||
| malloc.nix | ||
| networking.nix | ||
| no-x-libs.nix | ||
| nsswitch.nix | ||
| power-management.nix | ||
| pulseaudio.nix | ||
| shells-environment.nix | ||
| swap.nix | ||
| sysctl.nix | ||
| system-environment.nix | ||
| system-path.nix | ||
| terminfo.nix | ||
| timezone.nix | ||
| unix-odbc-drivers.nix | ||
| update-users-groups.pl | ||
| users-groups.nix | ||
| vpnc.nix | ||
| zram.nix | ||