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Merge pull request #3657 from obsidiansystems/sligthly-improve-store-path-documentation

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Clarify the description of StorePath inputs
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Eelco Dolstra 2020-06-17 14:54:37 +02:00 committed by GitHub
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1 changed files with 14 additions and 5 deletions
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19
src/libstore/store-api.cc
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@ -61,7 +61,7 @@ StorePathWithOutputs Store::followLinksToStorePathWithOutputs(std::string_view p
/* Store paths have the following form:
<store>/<h>-<name>
<realized-path> = <store>/<h>-<name>
where
@ -85,11 +85,14 @@ StorePathWithOutputs Store::followLinksToStorePathWithOutputs(std::string_view p
<type> = one of:
"text:<r1>:<r2>:...<rN>"
for plain text files written to the store using
addTextToStore(); <r1> ... <rN> are the references of the
path.
"source"
addTextToStore(); <r1> ... <rN> are the store paths referenced
by this path, in the form described by <realized-path>
"source:<r1>:<r2>:...:<rN>:self"
for paths copied to the store using addToStore() when recursive
= true and hashAlgo = "sha256"
= true and hashAlgo = "sha256". Just like in the text case, we
can have the store paths referenced by the path.
Additionally, we can have an optional :self label to denote self
reference.
"output:<id>"
for either the outputs created by derivations, OR paths copied
to the store using addToStore() with recursive != true or
@ -117,6 +120,12 @@ StorePathWithOutputs Store::followLinksToStorePathWithOutputs(std::string_view p
the contents of the path (or expected contents of the
path for fixed-output derivations)
Note that since an output derivation has always type output, while
something added by addToStore can have type output or source depending
on the hash, this means that the same input can be hashed differently
if added to the store via addToStore or via a derivation, in the sha256
recursive case.
It would have been nicer to handle fixed-output derivations under
"source", e.g. have something like "source:<rec><algo>", but we're
stuck with this for now...