Bug#914558: petsc: hardcodes path to sh depending on build host

[Paul Gevers]

Package: petsc
Version: 3.9.4+dfsg1-2

Dear maintainer,

Recently your package was rebuild as part of the hdf5 transition. During
the rebuild, the buildds accidentally had a merged usr setup [1].
Although this setup has been reverted, it exposed the fact that your
package embeds the path to sh from the build host, as the autopkgtest of
your started failing [2] with the error copied below. There was a large
thread on debian-devel at l.d.o about merged usr setup due to the buildd
issue. I think your build should not rely on the location of sh in the
$PATH of the build host.

I have requested binNMUs of your package on #debian-release.

Paul

[1] https://wiki.debian.org/UsrMerge
[2] https://ci.debian.net/packages/p/petsc/unstable/amd64/
[3]
https://lists.debian.org/msgid-search/20181120211617.gxnuwxpx2hy445ps@angband.pl

https://ci.debian.net/data/autopkgtest/testing/amd64/p/petsc/1370827/log.gz

autopkgtest [07:28:26]: test test-petsc: [-----------------------
Running test examples to verify correct installation
Using PETSC_DIR=/usr/lib/petsc
make: /usr/bin/sh: Command not found
make: [/usr/lib/petsc/lib/petsc/conf/rules:158: clean-legacy] Error 127
(ignored)
make: /usr/bin/sh: Command not found
make: [/usr/lib/petsc/lib/petsc/conf/rules:159: clean-legacy] Error 127
(ignored)
run SNES testex19
make: /usr/bin/sh: Command not found
make: [/usr/lib/petsc/lib/petsc/conf/rules:402: ex19.PETSc] Error 127
(ignored)
make: /usr/bin/sh: Command not found
make: [/usr/lib/petsc/lib/petsc/conf/rules:403: ex19.PETSc] Error 127
(ignored)
make: /usr/bin/sh: Command not found
make: [makefile:266: testex19] Error 127 (ignored)
test HYPRE
make: /usr/bin/sh: Command not found
make: [makefile:287: runex19_hypre] Error 127 (ignored)
test MUMPS
make: /usr/bin/sh: Command not found
make: [makefile:297: runex19_fieldsplit_mumps] Error 127 (ignored)
run testex5f
make: /usr/bin/sh: Command not found
make: [/usr/lib/petsc/lib/petsc/conf/rules:453: ex5f.PETSc] Error 127
(ignored)
make: /usr/bin/sh: Command not found
make: [/usr/lib/petsc/lib/petsc/conf/rules:454: ex5f.PETSc] Error 127
(ignored)
make: /usr/bin/sh: Command not found
make: *** [makefile:250: testex5f] Error 127
make: /usr/bin/sh: Command not found
make: [/usr/lib/petsc/lib/petsc/conf/rules:158: clean-legacy] Error 127
(ignored)
make: /usr/bin/sh: Command not found
make: [/usr/lib/petsc/lib/petsc/conf/rules:159: clean-legacy] Error 127
(ignored)
Completed test examples
autopkgtest [07:28:26]: test test-petsc: -----------------------]


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