How does apt/dpkg choose which real package is installed when a virtual package is specified as a dependency?
e.g. if package specifies
Depends: www-browser
How does apt/dpkg decide which real package will be installed?
apt dpkg aptitude
edited 1 hour ago
peterh
4,28592957
asked 4 hours ago
the_velour_fog
5,24533360
add a comment |
e.g. if package specifies
Depends: www-browser
How does apt/dpkg decide which real package will be installed?
apt dpkg aptitude
edited 1 hour ago
peterh
4,28592957
asked 4 hours ago
the_velour_fog
5,24533360
add a comment |
e.g. if package specifies
Depends: www-browser
How does apt/dpkg decide which real package will be installed?
apt dpkg aptitude
edited 1 hour ago
peterh
4,28592957
asked 4 hours ago
the_velour_fog
5,24533360
e.g. if package specifies
Depends: www-browser
How does apt/dpkg decide which real package will be installed?
apt dpkg aptitude
apt dpkg aptitude
edited 1 hour ago
peterh
4,28592957
asked 4 hours ago
the_velour_fog
5,24533360
edited 1 hour ago
peterh
4,28592957
asked 4 hours ago
the_velour_fog
5,24533360
edited 1 hour ago
peterh
4,28592957
edited 1 hour ago
peterh
4,28592957
edited 1 hour ago
peterh
4,28592957
4,28592957
asked 4 hours ago
the_velour_fog
5,24533360
asked 4 hours ago
the_velour_fog
5,24533360
asked 4 hours ago
the_velour_fog
5,24533360
5,24533360
add a comment |
add a comment |
1 Answer
1
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oldest
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According to this answer on Ask Ubuntu, apt will first try to install any non-virtual packages listed as options instead:
Now, according to sources, apt tries first of satisfying the dependency before trying with virtual packages (i.e., if depends are
firefox | www-browser, checks if any of the packages are installed, then try to install firefox if neither is).
If not, it will simply iterate over the list of packages that provide the virtual one, and install the first one that it can:
If the non-virtual package isn't available, it seems to just iterate over all packages which provides the virtual package, if no other dependencies are broken. Other comments evidence of this behavior are this which leads to GrpIterator::FindPreferredPkg function.
answered 4 hours ago
Nonny Moose
1415
It is discouraged to use pure virtual dependencies, usually you'd give one real and one virtual package as in your example. ForBuild-Depends, this is required by policy as well, as "or" relationships are ignored by autobuilders.
– Simon Richter
53 mins ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
According to this answer on Ask Ubuntu, apt will first try to install any non-virtual packages listed as options instead:
Now, according to sources, apt tries first of satisfying the dependency before trying with virtual packages (i.e., if depends are
firefox | www-browser, checks if any of the packages are installed, then try to install firefox if neither is).
If not, it will simply iterate over the list of packages that provide the virtual one, and install the first one that it can:
If the non-virtual package isn't available, it seems to just iterate over all packages which provides the virtual package, if no other dependencies are broken. Other comments evidence of this behavior are this which leads to GrpIterator::FindPreferredPkg function.
answered 4 hours ago
Nonny Moose
1415
It is discouraged to use pure virtual dependencies, usually you'd give one real and one virtual package as in your example. ForBuild-Depends, this is required by policy as well, as "or" relationships are ignored by autobuilders.
– Simon Richter
53 mins ago
add a comment |
According to this answer on Ask Ubuntu, apt will first try to install any non-virtual packages listed as options instead:
Now, according to sources, apt tries first of satisfying the dependency before trying with virtual packages (i.e., if depends are
firefox | www-browser, checks if any of the packages are installed, then try to install firefox if neither is).
If not, it will simply iterate over the list of packages that provide the virtual one, and install the first one that it can:
If the non-virtual package isn't available, it seems to just iterate over all packages which provides the virtual package, if no other dependencies are broken. Other comments evidence of this behavior are this which leads to GrpIterator::FindPreferredPkg function.
answered 4 hours ago
Nonny Moose
1415
It is discouraged to use pure virtual dependencies, usually you'd give one real and one virtual package as in your example. ForBuild-Depends, this is required by policy as well, as "or" relationships are ignored by autobuilders.
– Simon Richter
53 mins ago
add a comment |
According to this answer on Ask Ubuntu, apt will first try to install any non-virtual packages listed as options instead:
Now, according to sources, apt tries first of satisfying the dependency before trying with virtual packages (i.e., if depends are
firefox | www-browser, checks if any of the packages are installed, then try to install firefox if neither is).
If not, it will simply iterate over the list of packages that provide the virtual one, and install the first one that it can:
If the non-virtual package isn't available, it seems to just iterate over all packages which provides the virtual package, if no other dependencies are broken. Other comments evidence of this behavior are this which leads to GrpIterator::FindPreferredPkg function.
answered 4 hours ago
Nonny Moose
1415
According to this answer on Ask Ubuntu, apt will first try to install any non-virtual packages listed as options instead:
Now, according to sources, apt tries first of satisfying the dependency before trying with virtual packages (i.e., if depends are
firefox | www-browser, checks if any of the packages are installed, then try to install firefox if neither is).
If not, it will simply iterate over the list of packages that provide the virtual one, and install the first one that it can:
If the non-virtual package isn't available, it seems to just iterate over all packages which provides the virtual package, if no other dependencies are broken. Other comments evidence of this behavior are this which leads to GrpIterator::FindPreferredPkg function.
answered 4 hours ago
Nonny Moose
1415
answered 4 hours ago
Nonny Moose
1415
answered 4 hours ago
Nonny Moose
1415
answered 4 hours ago
Nonny Moose
1415
1415
It is discouraged to use pure virtual dependencies, usually you'd give one real and one virtual package as in your example. ForBuild-Depends, this is required by policy as well, as "or" relationships are ignored by autobuilders.
– Simon Richter
53 mins ago
add a comment |
It is discouraged to use pure virtual dependencies, usually you'd give one real and one virtual package as in your example. ForBuild-Depends, this is required by policy as well, as "or" relationships are ignored by autobuilders.
– Simon Richter
53 mins ago
It is discouraged to use pure virtual dependencies, usually you'd give one real and one virtual package as in your example. For
Build-Depends, this is required by policy as well, as "or" relationships are ignored by autobuilders.– Simon Richter
53 mins ago
It is discouraged to use pure virtual dependencies, usually you'd give one real and one virtual package as in your example. For
Build-Depends, this is required by policy as well, as "or" relationships are ignored by autobuilders.– Simon Richter
53 mins ago
add a comment |
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