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nix-env --upgrade: avoid unexpected downgrades

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Until now, if one explicitly installed a low-priority version,
nix-env --upgrade would downgrade it by default and even with --leq.
Let's never accept an upgrade with version not matching the upgradeType.
Additionally, let's never decrease the priority of an installed package;
you can use --install to force that.

Also refactor to use variable bestVersion instead of bestName,
as only version was used from it.
This commit is contained in:
Vladimír Čunát 2015-09-17 10:34:54 +02:00
parent 55b1146150
commit 64f9b511be
1 changed files with 8 additions and 6 deletions
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14
src/nix-env/nix-env.cc
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@ -570,14 +570,16 @@ static void upgradeDerivations(Globals & globals,
constraints specified by upgradeType. If there are
multiple matches, take the one with the highest
priority. If there are still multiple matches,
take the one with the highest version. */
take the one with the highest version.
Do not upgrade if it would decrease the priority. */
DrvInfos::iterator bestElem = availElems.end();
DrvName bestName;
string bestVersion;
for (auto j = availElems.begin(); j != availElems.end(); ++j) {
if (comparePriorities(*globals.state, i, *j) > 0)
continue;
DrvName newName(j->name);
if (newName.name == drvName.name) {
int d = comparePriorities(*globals.state, i, *j);
if (d == 0) d = compareVersions(drvName.version, newName.version);
int d = compareVersions(drvName.version, newName.version);
if ((upgradeType == utLt && d < 0) ||
(upgradeType == utLeq && d <= 0) ||
(upgradeType == utEq && d == 0) ||
@ -586,11 +588,11 @@ static void upgradeDerivations(Globals & globals,
int d2 = -1;
if (bestElem != availElems.end()) {
d2 = comparePriorities(*globals.state, *bestElem, *j);
if (d2 == 0) d2 = compareVersions(bestName.version, newName.version);
if (d2 == 0) d2 = compareVersions(bestVersion, newName.version);
}
if (d2 < 0 && (!globals.prebuiltOnly || isPrebuilt(*globals.state, *j))) {
bestElem = j;
bestName = newName;
bestVersion = newName.version;
}
}
}