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Migrate the old profiles to the new location

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Make sure that we don’t just create the new profiles directory, but that
we also migrate every existing profile to it.
This commit is contained in:
Théophane Hufschmitt 2022-04-13 10:26:50 +02:00
parent a5919f4754
commit 0601050755
1 changed files with 20 additions and 8 deletions
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28
src/libstore/profiles.cc
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@ -293,17 +293,29 @@ Path getDefaultProfile()
Path profileLink = getHome() + "/.nix-profile";
try {
// Migrate from the “old-style” profiles stored under `/nix/var`:
// If the link exists and points to the old location, rewrite it to the
// new one (otherwise keep-it as-it-is as it might have been
// intentionnally changed, in which case we shouldn’t touch it)
// If the link exists and points to the old location, then:
// - Rewrite it to point to the new location
// - For every generation of the old default profile, create a symlink
// from the new directory to it (so that all the previous profiles
// and generations are still available).
auto legacyProfile = getuid() == 0
? settings.nixStateDir + "/profiles/default"
: fmt("%s/profiles/per-user/%s/profile", settings.nixStateDir, getUserName());
if (!pathExists(profileLink) ||
(isLink(profileLink) &&
readLink(profileLink) == legacyProfile)
) {
replaceSymlink(profilesDir() + "/profile", profileLink);
auto newProfile = profilesDir() + "/profile";
if (!pathExists(profileLink)
|| (isLink(profileLink)
&& readLink(profileLink) == legacyProfile)) {
warn("Migrating the default profile");
replaceSymlink(newProfile, profileLink);
replaceSymlink(legacyProfile, newProfile);
if (pathExists(legacyProfile)) {
for (auto & oldGen : findGenerations(legacyProfile).first) {
replaceSymlink(
oldGen.path,
dirOf(newProfile) + "/"
+ std::string(baseNameOf(oldGen.path)));
}
}
}
return absPath(readLink(profileLink), dirOf(profileLink));
} catch (Error &) {