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# file      : tests/pkg-system.testscript
# license   : MIT; see accompanying LICENSE file

.include common.testscript auth.testscript config.testscript remote.testscript

# There is no pkg-system command, and this testscript contains tests for
# various building scenarios that involves system packages. Note that by that
# reason usage of $* is meaningless.
#

# Source repository:
#
# pkg-system
# |-- foo-2.tar.gz           -> libbar >= 2
# |-- libbar-0+1.tar.gz
# |-- libbar-1.tar.gz        -> libbaz == 2
# |-- libbar-2.tar.gz        -> libbaz == 2
# |-- libbaz-2.tar.gz
# |-- t1
# |   |-- foo-2.tar.gz       -> libbar >= 2
# |   |-- libbar-1.tar.gz    -> libbaz == 2
# |   |-- libbar-2.tar.gz    -> libbaz == 2
# |   |-- libbaz-2.tar.gz
# |   `-- repositories.manifest
# |-- t2
# |   |-- foo-2.tar.gz       -> libbar >= 2
# |   |-- libbar-0+1.tar.gz
# |   `-- repositories.manifest
# `-- t3                     -> t2 (prerequisite)
#     |-- foo-2.tar.gz       -> libbar >= 2
#     `-- repositories.manifest

# Prepare repositories used by tests if running in the local mode.
#
+if! $remote
  rep_create += 2>!

  cp -r $src/t1 $out/t1 && $rep_create $out/t1 &$out/t1/packages.manifest
  cp -r $src/t2 $out/t2 && $rep_create $out/t2 &$out/t2/packages.manifest
  cp -r $src/t3 $out/t3 && $rep_create $out/t3 &$out/t3/packages.manifest
end

pkg_build  += -d cfg --yes
pkg_drop   += -d cfg --yes 2>!
pkg_status += -d cfg
rep_add    += -d cfg 2>!
rep_fetch  += -d cfg --auth all --trust-yes 2>!
rep_remove += -d cfg 2>!

: no-repo
:
{
  $clone_cfg;

  $pkg_build 'sys:libbar' 2>>EOE != 0;
    error: unknown package sys:libbar
      info: consider specifying sys:libbar/*
    EOE

  $pkg_build 'sys:libbar/1' 2>>EOE;
    configured sys:libbar/1
    EOE

  $pkg_status libbar >'!libbar configured,system !1';

  $pkg_build 'sys:libbar/*' 2>>EOE;
    purged libbar/1
    configured sys:libbar/*
    EOE

  $pkg_status libbar >'!libbar configured,system !*'
}

# Note that when we fetch a package from remote repository the bpkg stderr
# contains fetch program progress output, that comes prior the informational
# message.
#
: t1
:
{
  +$clone_cfg && $rep_add $rep/t1 && $rep_fetch

  : dup
  :
  : Test that passing package duplicates on the command line expectedly fails.
  : Note that we unite all such tests into a single one for the sake of code
  : (and not to think of too many ids for almost identical tests :-)).
  :
  {
    $clone_cfg;

    $pkg_build 'sys:libbar' 'sys:libbar/1.0.0' 2>>EOE != 0;
      error: duplicate package libbar
        info: first mentioned as sys:libbar
        info: second mentioned as sys:libbar/1.0.0
      EOE

    $pkg_build '?sys:libbar' '?sys:libbar/1.0.0' 2>>EOE != 0;
      error: duplicate package libbar
        info: first mentioned as ?sys:libbar
        info: second mentioned as ?sys:libbar/1.0.0
      EOE

    $pkg_build 'sys:libbar' libbar 2>>EOE != 0;
      error: duplicate package libbar
        info: first mentioned as sys:libbar
        info: second mentioned as libbar
      EOE

    $pkg_build ?libbar '?sys:libbar' +{ --config-id 0 } 2>>EOE != 0;
      error: duplicate package libbar
        info: first mentioned as ?libbar
        info: second mentioned as ?sys:libbar +{ --config-id 0 }
      EOE

    $pkg_build 'sys:libbar' libbar 2>>EOE != 0;
      error: duplicate package libbar
        info: first mentioned as sys:libbar
        info: second mentioned as libbar
      EOE

    $pkg_build libbar 'sys:libbar' 2>>EOE != 0
      error: duplicate package libbar
        info: first mentioned as libbar
        info: second mentioned as sys:libbar
      EOE
  }

  : syslibbar-foo-syslibbar2-libbar2
  :
  : The overall plan is to build sys:libbar/*, foo, then reconfigure
  : sys:libbar/* to sys:libbar/2 and afterwards to libbar/2.
  :
  {
    $clone_cfg;

    # Build sys:libbar/*.
    #
    $pkg_build 'sys:libbar' 2>'configured sys:libbar/*';
    $pkg_status libbar      1>'!libbar configured,system !* available 2 1';
    $pkg_status libbaz      1>'libbaz available 2';

    # Build foo with preconfigured sys:libbar/*.
    #
    $pkg_build foo 2>>~%EOE%;
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !* available 2 1';
    $pkg_status libbaz >'libbaz available 2';

    # Reconfigure sys:libbar/* to 2.
    #
    $pkg_build 'sys:libbar/2' 2>>~%EOE%;
      disfigured foo/2
      purged libbar/*
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !2';
    $pkg_status libbaz >'libbaz available 2';

    # Reconfigure sys:libbar/2 to libbar/2.
    #
    $pkg_build libbar/2 2>>~%EOE%;
      disfigured foo/2
      purged libbar/2
      %.*
      %.*fetched libbaz/2%
      unpacked libbaz/2
      %.*
      %.*fetched libbar/2%
      unpacked libbar/2
      configured libbaz/2
      configured libbar/2
      configured foo/2
      %info: .+ is up to date%{2}
      updated libbar/2
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured !2';
    $pkg_status libbaz >'libbaz configured 2';

    $pkg_drop foo libbar
  }

  : foo-syslibbar2
  :
  : Build foo and sys:libbar/2.
  :
  {
    $clone_cfg;

    $pkg_build foo 'sys:libbar/2' 2>>~%EOE%;
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !2';
    $pkg_status libbaz >'libbaz available 2';

    $pkg_drop foo libbar
  }

  : syslibbar2-foo
  :
  : Build sys:libbar/2 and foo.
  :
  {
    $clone_cfg;

    $pkg_build 'sys:libbar/2' foo 2>>~%EOE%;
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !2';
    $pkg_status libbaz >'libbaz available 2';

    $pkg_drop foo libbar
  }

  : libbar2-foo-syslibbar2
  :
  : The overall plan is to build libbar/2, then foo and sys:libbar/2.
  :
  {
    $clone_cfg;

    # Build libbar/2.
    #
    $pkg_build libbar/2 2>>~%EOE%;
      %.*
      %.*fetched libbaz/2%
      unpacked libbaz/2
      %.*
      %.*fetched libbar/2%
      unpacked libbar/2
      configured libbaz/2
      configured libbar/2
      %info: .+ is up to date%
      updated libbar/2
      EOE

    $pkg_status libbar >'!libbar configured !2';
    $pkg_status libbaz >'libbaz configured 2';

    # Build foo and sys:libbar/2.
    #
    $pkg_build foo 'sys:libbar/2' 2>>~%EOE%;
      disfigured libbar/2
      disfigured libbaz/2
      purged libbaz/2
      purged libbar/2
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !2';
    $pkg_status libbaz >'libbaz available 2';

    $pkg_drop foo libbar
  }

  : libbar2-foo-syslibbar
  :
  : The overall plan is to build libbar/2, then foo and sys:libbar.
  :
  {
    $clone_cfg;

    # Build libbar/2.
    #
    $pkg_build libbar/2 2>>~%EOE%;
      %.*
      %.*fetched libbaz/2%
      unpacked libbaz/2
      %.*
      %.*fetched libbar/2%
      unpacked libbar/2
      configured libbaz/2
      configured libbar/2
      %info: .+ is up to date%
      updated libbar/2
      EOE

    $pkg_status libbar >'!libbar configured !2';
    $pkg_status libbaz >'libbaz configured 2';

    # Build foo and sys:libbar.
    #
    $pkg_build foo 'sys:libbar' 2>>~%EOE%;
      disfigured libbar/2
      disfigured libbaz/2
      purged libbaz/2
      purged libbar/2
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/*
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !* available 2 1';
    $pkg_status libbaz >'libbaz available 2';

    $pkg_drop foo libbar
  }

  : syslibbar2-foo-libbar2-syslibbar2-libbar2
  :
  : The overall plan is to build sys:libbar/2, then foo and libbar/2, then
  : reconfigure to sys:libbar/2 and afterwards to libbar/2.
  :
  {
    $clone_cfg;

    # Build sys:libbar/2.
    #
    $pkg_build 'sys:libbar/2' 2>'configured sys:libbar/2';
    $pkg_status libbar         >'!libbar configured,system !2';

    # Build foo and libbar/2.
    #
    $pkg_build foo libbar/2 2>>~%EOE%;
      purged libbar/2
      %.*
      %.*fetched libbaz/2%
      unpacked libbaz/2
      %.*
      %.*fetched libbar/2%
      unpacked libbar/2
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured libbaz/2
      configured libbar/2
      configured foo/2
      %info: .+ is up to date%{2}
      updated libbar/2
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured !2';
    $pkg_status libbaz >'libbaz configured 2';

    # Build sys:libbar/2.
    #
    $pkg_build 'sys:libbar/2' 2>>~%EOE%;
      disfigured foo/2
      disfigured libbar/2
      disfigured libbaz/2
      purged libbaz/2
      purged libbar/2
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !2';
    $pkg_status libbaz >'libbaz available 2';

    # Build libbar/2.
    #
    $pkg_build libbar/2 2>>~%EOE%;
      disfigured foo/2
      purged libbar/2
      %.*
      %.*fetched libbaz/2%
      unpacked libbaz/2
      %.*
      %.*fetched libbar/2%
      unpacked libbar/2
      configured libbaz/2
      configured libbar/2
      configured foo/2
      %info: .+ is up to date%{2}
      updated libbar/2
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured !2';
    $pkg_status libbaz >'libbaz configured 2';

    $pkg_drop foo libbar
  }

  : syslibbar1-foo-libbar
  :
  : The overall plan is to configure sys:libbar/1, then fail to build foo but
  : succeed to build foo libbar.
  :
  {
    $clone_cfg;

    # Build sys:libbar/1.
    #
    $pkg_build 'sys:libbar/1' 2>'configured sys:libbar/1';
    $pkg_status libbar        1>'!libbar configured,system !1 available 2';
    $pkg_status libbaz        1>'libbaz available 2';

    # Fail to build foo.
    #
    $pkg_build foo 2>>EOE != 0;
      error: package foo dependency on (libbar >= 2) is forcing upgrade of sys:libbar/1 to libbar/2
        info: package version sys:libbar/1 is held
        info: explicitly request version upgrade to continue
      info: while satisfying foo/2
      EOE

    # Build foo and libbar.
    #
    $pkg_build foo libbar 2>>~%EOE%;
      purged libbar/1
      %.*
      %.*fetched libbaz/2%
      unpacked libbaz/2
      %.*
      %.*fetched libbar/2%
      unpacked libbar/2
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured libbaz/2
      configured libbar/2
      configured foo/2
      %info: .+ is up to date%{2}
      updated libbar/2
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured 2';
    $pkg_status libbaz >'libbaz configured 2';

    $pkg_drop foo libbar
  }

  : foo-syslibbar
  :
  : Build foo and ?sys:libbar.
  :
  {
    $clone_cfg;

    $pkg_build foo '?sys:libbar' 2>>~%EOE%;
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/*
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'libbar configured,system !* available 2 1';
    $pkg_status libbaz >'libbaz available 2';

    $pkg_drop foo libbar
  }

  : libbar1-foo-syslibbar2
  :
  : The overall plan is to configure libbar/1, then fail to build foo but
  : succeed to build foo ?sys:libbar/2, and then foo sys:libbar/2.
  :
  {
    $clone_cfg;

    # Build libbar/1.
    #
    $pkg_build libbar/1 2>>~%EOE%;
      %.*
      %.*fetched libbaz/2%
      unpacked libbaz/2
      %.*
      %.*fetched libbar/1%
      unpacked libbar/1
      configured libbaz/2
      configured libbar/1
      %info: .+ is up to date%
      updated libbar/1
      EOE

    $pkg_status libbar >'!libbar configured !1 available 2';
    $pkg_status libbaz >'libbaz configured 2';

    # Fail to build foo.
    #
    $pkg_build foo 2>>EOE != 0;
      error: package foo dependency on (libbar >= 2) is forcing upgrade of libbar/1 to 2
        info: package version libbar/1 is held
        info: explicitly request version upgrade to continue
      info: while satisfying foo/2
      EOE

    # Build foo and ?sys:libbar/2.
    #
    $pkg_build foo '?sys:libbar/2' 2>>~%EOE%;
      disfigured libbar/1
      disfigured libbaz/2
      purged libbaz/2
      purged libbar/1
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'libbar configured,system !2';
    $pkg_status libbaz >'libbaz available 2';

    # Build foo and sys:libbar/2.
    #
    $pkg_build foo 'sys:libbar/2' 2>>~%EOE%;
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !2';
    $pkg_status libbaz >'libbaz available 2';

    $pkg_drop foo libbar
  }

  : upgrade-held
  :
  {
    $clone_cfg;

    $pkg_build libbar 2>!;

    $rep_remove $rep/t1 && $rep_fetch $rep/t2;

    $pkg_build --upgrade 2>>EOE != 0;
      error: libbar is not available in source
        info: consider building it as sys:libbar if it is available from the system
      EOE

    $pkg_build 'sys:libbar' 2>>EOE;
      disfigured libbar/2
      disfigured libbaz/2
      purged libbaz/2
      purged libbar/2
      configured sys:libbar/*
      EOE

    $pkg_build --upgrade 2>'info: nothing to build';

    $pkg_drop libbar
  }
}

: t2
:
{
  +$clone_cfg && $rep_add $rep/t2 && $rep_fetch

  : no-libbar
  :
  : Test that the following builds expectedly fails having no libbar available
  : in source.
  :
  {
    $clone_cfg;

    $pkg_build foo 2>>EOE != 0;
      error: dependency libbar >= 2 of package foo is not available in source
        info: specify ?sys:libbar if it is available from the system
      info: while satisfying foo/2
      EOE

    $pkg_build foo libbar 2>>EOE != 0;
      error: libbar is not available in source
        info: specify sys:libbar if it is available from the system
      EOE

    $pkg_status foo    >'foo available 2';
    $pkg_status libbar >'libbar unknown'
  }

  : foo-syslibbar
  :
  : Build foo configuring sys:libbar.
  :
  {
    $clone_cfg;

    $pkg_build foo 'sys:libbar' 2>>~%EOE%;
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/*
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !*';

    $pkg_drop foo libbar
  }

  : libbar1-foo-syslibbar2
  :
  : The overall plan is to configure sys:libbar/1, then fail to build foo, but
  : succeed to build foo sys:libbar/2.
  :
  {
    $clone_cfg;

    # Build sys:libbar/1.
    #
    $pkg_build 'sys:libbar/1' 2>'configured sys:libbar/1';
    $pkg_status libbar        1>'!libbar configured,system !1';

    # Fail to build foo.
    #
    $pkg_build foo 2>>EOE != 0;
      error: dependency libbar >= 2 of package foo is not available in source
        info: sys:libbar/1 does not satisfy the constrains
      info: while satisfying foo/2
      EOE

    # Build foo and sys:libbar/2.
    #
    $pkg_build foo 'sys:libbar/2' 2>>~%EOE%;
      purged libbar/1
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'!libbar configured,system !2';

    $pkg_drop foo libbar
  }

  : syslibbar2
  :
  : The overall plan is to fail to build foo sys:libbar/1, then configure
  : sys:libbar/2 but still fail to build foo sys:libbar/1.
  :
  {
    $clone_cfg;

    # Fail to build foo and sys:libbar/1.
    #
    $pkg_build foo 'sys:libbar/1' 2>>EOE != 0;
      error: dependency libbar >= 2 of package foo is not available in source
        info: sys:libbar/1 does not satisfy the constrains
      info: while satisfying foo/2
      EOE

    # Build sys:libbar/2.
    #
    $pkg_build 'sys:libbar/2' 2>'configured sys:libbar/2';
    $pkg_status libbar        1>'!libbar configured,system !2';

    # Still fail to build foo and sys:libbar/1.
    #
    $pkg_build foo 'sys:libbar/1' 2>>EOE != 0;
      error: unable to satisfy constraints on package libbar
        info: command line depends on (libbar == 1)
        info: foo/2 depends on (libbar >= 2)
        info: available sys:libbar/1
        info: available sys:libbar/2
        info: while satisfying foo/2
        info: explicitly specify libbar version to manually satisfy both constraints
      EOE

    $pkg_drop libbar
  }

  : syslibbar1
  :
  : The overall plan is to configure sys:libbar/1, then fail to build
  : sys:libbar/1.1 foo.
  :
  {
    $clone_cfg;

    # Build sys:libbar/2.
    #
    $pkg_build 'sys:libbar/1' 2>'configured sys:libbar/1';
    $pkg_status libbar        1>'!libbar configured,system !1';

    # Fail to build sys:libbar/1.1 and foo.
    #
    $pkg_build 'sys:libbar/1.1' foo 2>>EOE != 0;
      error: dependency libbar >= 2 of package foo is not available in source
        info: sys:libbar/1.1 does not satisfy the constrains
      info: while satisfying foo/2
      EOE

    $pkg_drop libbar
  }

  : foo-syslibbar-drop-foo
  :
  : The overall plan is to build foo ?sys:libbar, then drop foo and make sure
  : libbar is purged as well.
  :
  {
    $clone_cfg;

    # Build foo and ?sys:libbar.
    #
    $pkg_build foo '?sys:libbar' 2>>~%EOE%;
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/*
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'libbar configured,system !*';

    # Drop foo.
    #
    $pkg_drop foo 2>>EOE;
      disfigured foo
      purged libbar
      purged foo
      EOE

    $pkg_status foo    >'foo available 2';
    $pkg_status libbar --system >'libbar available sys:?'
  }

  : syslibbar1-foo-syslibbar-drop-foo
  :
  : The overall plan is to build sys:libbar/1, then fail to build foo but
  : succeed to build foo ?sys:libbar, then drop foo and make sure libbar stays.
  :
  {
    $clone_cfg;

    # Build sys:libbar/1.
    #
    $pkg_build 'sys:libbar/1' 2>'configured sys:libbar/1';
    $pkg_status libbar        1>'!libbar configured,system !1';

    # Fail to build foo.
    #
    $pkg_build foo 2>>EOE != 0;
      error: dependency libbar >= 2 of package foo is not available in source
        info: sys:libbar/1 does not satisfy the constrains
      info: while satisfying foo/2
      EOE

    # Build foo and '?sys:libbar/2'.
    #
    $pkg_build foo '?sys:libbar/2' 2>>~%EOE%;
      purged libbar/1
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'libbar configured,system !2';

    # Drop foo.
    #
    $pkg_drop foo 2>>EOE;
      disfigured foo
      purged libbar
      purged foo
      EOE

    $pkg_status foo             >'foo available 2';
    $pkg_status libbar --system >'libbar available sys:?'
  }
}

: t3
:
{
  +$clone_cfg && $rep_add $rep/t3 && $rep_fetch

  : no-libbar
  :
  : Test that the following builds expectedly fails having no libbar available
  : in source.
  :
  {
    $clone_cfg;

    $pkg_build foo 2>>EOE != 0;
      error: dependency libbar >= 2 of package foo is not available in source
        info: specify ?sys:libbar if it is available from the system
      info: while satisfying foo/2
      EOE

    $pkg_build foo 'sys:libbar/1' 2>>EOE != 0;
      error: dependency libbar >= 2 of package foo is not available in source
        info: sys:libbar/1 does not satisfy the constrains
      info: while satisfying foo/2
      EOE

    $pkg_build foo '?sys:libbar/1' 2>>EOE != 0;
      error: unable to satisfy constraints on package libbar
        info: foo/2 depends on (libbar >= 2)
        info: command line depends on (libbar == 1)
        info: while satisfying foo/2
        info: explicitly specify libbar version to manually satisfy both constraints
      EOE

    $pkg_status foo    >'foo available 2';
    $pkg_status libbar >'libbar unknown'
  }

  : find-all
  :
  : Test that sys:libbar can be built to hold even if its stub package is not
  : available from the configured repository but only from its prerequisite
  : repository.
  :
  {
    $clone_cfg;

    $pkg_build 'sys:libbar' 2>>EOE;
      configured sys:libbar/*
      EOE

    $pkg_status libbar >'!libbar configured,system !*'
  }

  : syslibbar1-foo-syslibbar-drop-foo
  :
  : The overall plan is to build foo ?sys:libbar/2, then foo ?sys:libbar/3,
  : and then foo ?sys:libbar.
  :
  {
    $clone_cfg;

    # Build foo '?sys:libbar/2'.
    #
    $pkg_build foo '?sys:libbar/2' 2>>~%EOE%;
      %.*
      %.*fetched foo/2%
      unpacked foo/2
      configured sys:libbar/2
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'libbar configured,system !2';

    # Build foo and ?sys:libbar/3.
    #
    $pkg_build foo '?sys:libbar/3' 2>>~%EOE%;
      disfigured foo/2
      purged libbar/2
      configured sys:libbar/3
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'libbar configured,system !3';

    # Build foo and ?sys:libbar.
    #
    $pkg_build foo '?sys:libbar' 2>>~%EOE%;
      disfigured foo/2
      purged libbar/3
      configured sys:libbar/*
      configured foo/2
      %info: .+ is up to date%
      updated foo/2
      EOE

    $pkg_status foo    >'!foo configured 2';
    $pkg_status libbar >'libbar configured,system !*';

    $pkg_drop foo
  }

  : unhold
  :
  : Test that the system package get purged once unheld (and there are
  : no dependencies).
  :
  {
    $clone_cfg;

    $pkg_build 'sys:foo' 2>'configured sys:foo/*';

    $pkg_build ?foo 2>'purged foo/*'
  }
}