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haskell-cabal.eclass: Add early check for invalid GHC cache

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If the GHC cache is invalid, it can create a confusing error during
src_compile. Add a check in haskell-cabal-pkg_setup that checks for
and fixes an invalid cache.

Closes: https://bugs.gentoo.org/916785
Closes: https://bugs.gentoo.org/916971
Closes: https://bugs.gentoo.org/920879
Closes: https://github.com/gentoo-haskell/gentoo-haskell/issues/1469
Thanks-to: Tom Gillespie <tgbugs@gmail.com>
Signed-off-by: hololeap <hololeap@protonmail.com>
Part-of: https://github.com/gentoo/gentoo/pull/41562
Closes: https://github.com/gentoo/gentoo/pull/41562
Signed-off-by: Arsen Arsenović <arsen@gentoo.org>
This commit is contained in:
hololeap 2025-04-12 11:41:40 -06:00 committed by Arsen Arsenović
parent 78beda50cf
commit 8ae4c6d315
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1 changed files with 24 additions and 0 deletions
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eclass/haskell-cabal.eclass
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@ -661,6 +661,23 @@ cabal-is-dummy-lib() {
return 1
}
# @FUNCTION: cabal-check-cache
# @DESCRIPTION:
# Check the state of the GHC cache by running 'ghc-pkg check' and looking
# for the string "WARNING: cache is out of date". If the string is not found,
# the cache is considered valid and the function returns 0. If it is found,
# the cache is considered invalid and the function returns 1.
cabal-check-cache() {
if $(ghc-getghcpkg) check 2>&1 \
| grep -q 'WARNING: cache is out of date'
then
ewarn 'GHC cache is out of date!'
return 1
else
return 0
fi
}
# exported function: check if cabal is correctly installed for
# the currently active ghc (we cannot guarantee this with portage)
haskell-cabal_pkg_setup() {
@ -672,6 +689,13 @@ haskell-cabal_pkg_setup() {
fi
if cabal-is-dummy-lib; then
einfo "${P} is included in ghc-${CABAL_CORE_LIB_GHC_PV}, nothing to install."
else
# bug 916785
if ! cabal-check-cache; then
# avoid running ghc-recache-db so as not to set _GHC_RECACHE_CALLED
einfo "Recaching GHC package DB"
$(ghc-getghcpkg) recache
fi
fi
}