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authorJohannes 'josch' Schauer <josch@mister-muffin.de>2016-05-12 13:07:59 +0200
committerDavid Kalnischkies <david@kalnischkies.de>2016-05-12 14:52:29 +0200
commitd67db03c2ab853eba7b67c8870af41796eea387c (patch)
treeb1d49d1db6a6675fca3bf5211d3464843b6e2970 /apt-pkg/algorithms.h
parent5b0577488ff60e7163fe7dc62a044329d398d726 (diff)
edsp: document unique package identifiers
Document that package identifiers must be unique (apt only uses the last action for a given identifier) and that install requests do also imply upgrades and downgrades (and thus removal of the old version). This is to prevent that solvers express an upgrade or downgrade instruction as two stanzas: a removal of the old version and an installation of the new version. Instead, a single install stanza is sufficient to express upgrade or downgrade requests.
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