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* Package flag "keep" that prevents a package from being removed from 

a user environment by an install or upgrade action.  This is
  particularly useful if you have a version installed that you don't
  want to upgrade (e.g., because the newer versions are broken).
  Example:

    $ nix-env -u zapping --dry-run
    (dry run; not doing anything)
    upgrading `zapping-0.9.6' to `zapping-0.10cvs6'

    $ nix-env --set-flag keep true zapping

    $ nix-env -u zapping --dry-run
    (dry run; not doing anything)

  However, "-e" will still uninstall the package.  (Maybe we should
  require the keep flag to be explicitly set to false before it can be
  uninstalled.)
This commit is contained in:
Eelco Dolstra 2007-04-27 23:48:14 +00:00
parent a46db5d013
commit 89c1d2b202
2 changed files with 8 additions and 3 deletions
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4
doc/manual/release-notes.xml
View File

@ -72,8 +72,8 @@
<listitem><para>TODO: <command>nix-env</command>
<option>--set-flag</option>. Specific flags:
<literal>active</literal>,
<literal>priority</literal>.</para></listitem>
<literal>active</literal>, <literal>priority</literal>,
<literal>keep</literal>.</para></listitem>
<listitem><para><command>nix-env -q</command> now has a flag

7
src/nix-env/nix-env.cc
View File

@ -482,8 +482,10 @@ static void installDerivations(Globals & globals,
i != installedElems.end(); ++i)
{
DrvName drvName(i->name);
MetaInfo meta = i->queryMetaInfo(globals.state);
if (!globals.preserveInstalled &&
newNames.find(drvName.name) != newNames.end())
newNames.find(drvName.name) != newNames.end() &&
meta["keep"] == "true")
printMsg(lvlInfo,
format("replacing old `%1%'") % i->name);
else
@ -543,6 +545,9 @@ static void upgradeDerivations(Globals & globals,
{
DrvName drvName(i->name);
MetaInfo meta = i->queryMetaInfo(globals.state);
if (meta["keep"] == "true") continue;
/* Find the derivation in the input Nix expression with the
same name and satisfying the version constraints specified
by upgradeType. If there are multiple matches, take the