add hidden config to set packages as Essential/Important

You can pretty much achieve the same with a local dummy package if you
want to, but libapt has an inbuilt setting for essential: "apt" which
can be overridden with this option as well – it could be helpful in
quick tests and what not so adding this alternative shouldn't really
hurt much.

We aren't going to document them much through as care must be taken in
regards to the binary caches as they aren't invalidated by config
options alone, so the effects of old settings could still be in them,
similar to the other already existing pkgCacheGen option(s).

Closes: 767891
Thanks: Anthony Towns for initial patch

diff --git a/apt-pkg/deb/deblistparser.cc b/apt-pkg/deb/deblistparser.cc
index 99e806470e29a50b182cb32df5fefe28d162a8e8..0f9fe310fb318e7b1c46345827758f6ec5be6d70 100644 (file)
--- a/apt-pkg/deb/deblistparser.cc
+++ b/apt-pkg/deb/deblistparser.cc
@@ -50,8 +50,18 @@ static const debListParser::WordList PrioList[] = {
    in Step(), if no Architecture is given we will accept every arch
    we would accept in general with checkArchitecture() */
 debListParser::debListParser(FileFd *File) :
-   pkgCacheListParser(), d(NULL), Tags(File)
+   pkgCacheListParser(), Tags(File)
 {
+   // this dance allows an empty value to override the default
+   if (_config->Exists("pkgCacheGen::ForceEssential"))
+   {
+      forceEssential = _config->FindVector("pkgCacheGen::ForceEssential");
+      if (forceEssential.empty() == false && _config->Find("pkgCacheGen::ForceEssential").empty())
+        forceEssential.emplace_back("apt");
+   }
+   else
+      forceEssential.emplace_back("apt");
+   forceImportant = _config->FindVector("pkgCacheGen::ForceImportant");
 }
                                                                        /*}}}*/
 // ListParser::Package - Return the package name                       /*{{{*/
@@ -311,7 +321,7 @@ bool debListParser::UsePackage(pkgCache::PkgIterator &Pkg,
    if (Section.FindFlag("Important",Pkg->Flags,pkgCache::Flag::Important) == false)
       return false;
 
-   if (strcmp(Pkg.Name(),"apt") == 0)
+   if (std::find(forceEssential.begin(), forceEssential.end(), Pkg.Name()) != forceEssential.end())
    {
       if ((essential == "native" && Pkg->Arch != 0 && myArch == Pkg.Arch()) ||
          essential == "all")
@@ -319,6 +329,8 @@ bool debListParser::UsePackage(pkgCache::PkgIterator &Pkg,
       else
         Pkg->Flags |= pkgCache::Flag::Important;
    }
+   else if (std::find(forceImportant.begin(), forceImportant.end(), Pkg.Name()) != forceImportant.end())
+      Pkg->Flags |= pkgCache::Flag::Important;
 
    if (ParseStatus(Pkg,Ver) == false)
       return false;

diff --git a/apt-pkg/deb/deblistparser.h b/apt-pkg/deb/deblistparser.h
index a78312f9d6e07283223aa7962b9330963800b110..102cd62aa18c65bd8624a43002b9c99f25b3fc16 100644 (file)
--- a/apt-pkg/deb/deblistparser.h
+++ b/apt-pkg/deb/deblistparser.h
@@ -43,8 +43,8 @@ class APT_HIDDEN debListParser : public pkgCacheListParser
 #endif
 
    private:
-   /** \brief dpointer placeholder (for later in case we need it) */
-   void * const d;
+   std::vector<std::string> forceEssential;
+   std::vector<std::string> forceImportant;
 
    protected:
    pkgTagFile Tags;

diff --git a/doc/examples/configure-index b/doc/examples/configure-index
index dc579c3946ce5631b52656417ed5164462d299c4..2d0fb6c64b4565821a302b9e2a93aed367bd7089 100644 (file)
--- a/doc/examples/configure-index
+++ b/doc/examples/configure-index
@@ -461,7 +461,12 @@ Debug
   RunScripts "false";      // debug invocation of external scripts  
 }
 
-pkgCacheGen::Essential "native"; // other modes: all, none, installed
+pkgCacheGen
+{
+  Essential "native"; // other modes: all, none, installed
+  ForceEssential { "apt"; };
+  ForceImportant "";
+}
 
 /* Whatever you do, do not use this configuration file!! Take out ONLY
    the portions you need! */

diff --git a/test/integration/test-bug-767891-force-essential-important b/test/integration/test-bug-767891-force-essential-important
new file mode 100755 (executable)
index 0000000..7a23de5
--- /dev/null
+++ b/test/integration/test-bug-767891-force-essential-important
@@ -0,0 +1,100 @@
+#!/bin/sh
+set -e
+
+TESTDIR="$(readlink -f "$(dirname "$0")")"
+. "$TESTDIR/framework"
+setupenvironment
+configarchitecture 'amd64' 'i386'
+
+insertinstalledpackage 'apt' 'amd64' '1'
+insertinstalledpackage 'foo' 'amd64,i386' '1' 'Multi-Arch: same'
+insertinstalledpackage 'bar' 'amd64' '1' 'Provides: foo'
+
+insertpackage 'unstable' 'foo2' 'amd64,i386' '1' 'Multi-Arch: same'
+
+setupaptarchive
+
+rm -f rootdir/var/cache/apt/*.bin
+testsuccessequal 'Reading package lists...
+Building dependency tree...
+The following packages will be REMOVED:
+  apt* bar* foo* foo:i386*
+WARNING: The following essential packages will be removed.
+This should NOT be done unless you know exactly what you are doing!
+  apt
+0 upgraded, 0 newly installed, 4 to remove and 0 not upgraded.
+Purg apt [1]
+Purg bar [1]
+Purg foo [1]
+Purg foo:i386 [1]' apt purge apt foo foo:i386 bar -s
+
+rm -f rootdir/var/cache/apt/*.bin
+testsuccessequal 'Reading package lists...
+Building dependency tree...
+The following packages will be REMOVED:
+  apt* bar* foo* foo:i386*
+0 upgraded, 0 newly installed, 4 to remove and 0 not upgraded.
+Purg apt [1]
+Purg bar [1]
+Purg foo [1]
+Purg foo:i386 [1]' apt purge apt foo foo:i386 bar -s -o pkgCacheGen::ForceEssential=''
+
+msgmsg 'foo:i386 got the Important flag'
+rm -f rootdir/var/cache/apt/*.bin
+testsuccessequal 'Reading package lists...
+Building dependency tree...
+The following packages will be REMOVED:
+  apt* bar* foo* foo:i386*
+WARNING: The following essential packages will be removed.
+This should NOT be done unless you know exactly what you are doing!
+  foo foo:i386
+0 upgraded, 0 newly installed, 4 to remove and 0 not upgraded.
+Purg apt [1]
+Purg bar [1]
+Purg foo [1]
+Purg foo:i386 [1]' apt purge apt foo foo:i386 bar -s -o pkgCacheGen::ForceEssential='foo'
+
+rm -f rootdir/var/cache/apt/*.bin
+testsuccessequal 'Reading package lists...
+Building dependency tree...
+The following packages will be REMOVED:
+  apt* bar* foo* foo:i386*
+WARNING: The following essential packages will be removed.
+This should NOT be done unless you know exactly what you are doing!
+  apt foo foo:i386
+0 upgraded, 0 newly installed, 4 to remove and 0 not upgraded.
+Purg apt [1]
+Purg bar [1]
+Purg foo [1]
+Purg foo:i386 [1]' apt purge apt foo foo:i386 bar -s -o pkgCacheGen::ForceEssential::='foo'
+
+msgmsg 'essentials only from native'
+rm -f rootdir/var/cache/apt/*.bin
+testsuccessequal 'Reading package lists...
+Building dependency tree...
+Calculating upgrade...
+The following NEW packages will be installed:
+  foo2
+0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
+Inst foo2 (1 unstable [amd64])
+Conf foo2 (1 unstable [amd64])' apt full-upgrade -s -o pkgCacheGen::ForceEssential::='foo2'
+
+msgmsg 'important only effects installed'
+rm -f rootdir/var/cache/apt/*.bin
+testsuccessequal 'Reading package lists...
+Building dependency tree...
+The following packages will be REMOVED:
+  apt* bar* foo* foo:i386*
+WARNING: The following essential packages will be removed.
+This should NOT be done unless you know exactly what you are doing!
+  apt foo foo:i386
+0 upgraded, 0 newly installed, 4 to remove and 0 not upgraded.
+Purg apt [1]
+Purg bar [1]
+Purg foo [1]
+Purg foo:i386 [1]' apt purge apt foo foo:i386 bar -s -o pkgCacheGen::ForceImportant::='foo'
+rm -f rootdir/var/cache/apt/*.bin
+testsuccessequal 'Reading package lists...
+Building dependency tree...
+Calculating upgrade...
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.' apt full-upgrade -s -o pkgCacheGen::ForceImportant::='foo2'