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Opam pin depends refactors #831

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Opam pin depends refactors #831

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MisterDA
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Follow-up to #791 and fix #826.
ocaml-ci itself uses git and tar pin-depends, if it builds correctly the changes are (likely) correct too!

@MisterDA
Refactor pin-depends
ac9714e 
Share common code.
When scanning tar archives, always keep the last entry if the filename
is found multiple times (tar is an append-only filesystem). If entries
for multiple names are found, introduce a concept of priority and keep
the better one.
@MisterDA
Also look for files named 'opam' in pin-depends
ce9a218 
Compatibillity with topkg/brr/oasis, where the opam file is simply
named 'opam'.
@benmandrew
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I ran on my own fork of OCaml-CI (benmandrew/ocaml-ci) and had some failures:

On the master branch I had:

2023-06-26 16:26.06: ocaml-ci-web.dev: found pin-depends: tailwindcss.~dev -> https://github.com/tmattio/opam-tailwindcss/archive/f0d65be5f94322f48497b33bc05c057882d57977.tar.gz
2023-06-26 16:26.06: ocaml-ci-web.dev: found pin-depends: tailwindcss.~dev -> https://github.com/tmattio/opam-tailwindcss/archive/f0d65be5f94322f48497b33bc05c057882d57977.tar.gz
2023-06-26 16:26.06: Job failed: Tar.Header.Checksum_mismatch

On the keep-capnp-secrets branch the analysis succeeded (along with the builds) but there appears to have been some non-fatal errors:

2023-06-26 16:26.03: ocaml-ci-web.dev: found pin-depends: tailwindcss.dev -> git+https://github.com/tmattio/opam-tailwindcss#f0d65be5f94322f48497b33bc05c057882d57977
2023-06-26 16:26.03: Exec: "git" "-C" "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c" 
                           "show" "f0d65be5f94322f48497b33bc05c057882d57977:tailwindcss.opam"
2023-06-26 16:26.03: ocaml-ci-web.dev: found pin-depends: tailwindcss.dev -> git+https://github.com/tmattio/opam-tailwindcss#f0d65be5f94322f48497b33bc05c057882d57977
2023-06-26 16:26.03: Exec: "git" "-C" "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c" 
                           "show" "f0d65be5f94322f48497b33bc05c057882d57977:tailwindcss.opam"
fatal: cannot change to '/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c': No such file or directory
2023-06-26 16:26.03: Exec: "git" "-C" "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c" 
                           "show" "f0d65be5f94322f48497b33bc05c057882d57977:opam/tailwindcss.opam"
fatal: cannot change to '/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c': No such file or directory
fatal: cannot change to '/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c': No such file or directory
2023-06-26 16:26.03: Exec: "git" "-C" "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c" 
                           "show" "f0d65be5f94322f48497b33bc05c057882d57977:opam/tailwindcss.opam"
2023-06-26 16:26.03: Exec: "git" "-C" "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c" 
                           "show" "f0d65be5f94322f48497b33bc05c057882d57977:opam"
fatal: cannot change to '/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c': No such file or directory
2023-06-26 16:26.03: Exec: "git" "-C" "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c" 
                           "show" "f0d65be5f94322f48497b33bc05c057882d57977:opam"
fatal: cannot change to '/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c': No such file or directory
2023-06-26 16:26.03: Exec: "git" "clone" "-q" "https://github.com/tmattio/opam-tailwindcss" 
                           "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c"
fatal: cannot change to '/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c': No such file or directory
2023-06-26 16:26.57: Exec: "git" "-C" "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c" 
                           "show" "f0d65be5f94322f48497b33bc05c057882d57977:tailwindcss.opam"
2023-06-26 16:26.57: Exec: "git" "-C" "/Users/benmandrew/projects/t/ocaml-ci/var/pin-depends/opam-tailwindcss-15d4d53849bf40e63de281bc9ea2f28c" 
                           "fetch"

@MisterDA
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Well then I'll write tests and inspect what's going on.
Thank you very much for trying this!

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OCaml-CI should search for opam file names in pin-depends or vendored git submodules
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@MisterDA @benmandrew