dune pkg lock fails when pinned repo has a tag with the same name as a branch

[huwaireb]

Expected Behavior

Running dune pkg lock succeeds.

Actual Behavior

Instead, it fails with the following

Internal error, please report upstream including the contents of _build/log.
Description:
  ("Map.of_list_exn", { key = "v0.9.5.0" })
Raised at Stdune__Code_error.raise in file
  "otherlibs/stdune/src/code_error.ml", line 10, characters 30-62
Called from Dune_pkg__Rev_store.remote.(fun).f.(fun) in file
  "src/dune_pkg/rev_store.ml", line 793, characters 26-66
Called from Fiber__Core.O.(>>|).(fun) in file "vendor/fiber/src/core.ml",
  line 253, characters 36-41
Called from Fiber__Scheduler.exec in file "vendor/fiber/src/scheduler.ml",
  line 76, characters 8-11
Re-raised at Stdune__Exn.raise_with_backtrace in file
  "otherlibs/stdune/src/exn.ml" (inlined), line 38, characters 27-56
Called from Stdune__Exn_with_backtrace.reraise in file
  "otherlibs/stdune/src/exn_with_backtrace.ml", line 20, characters 33-71
Called from Fiber__Scheduler.exec in file "vendor/fiber/src/scheduler.ml",
  line 76, characters 8-11
Re-raised at Stdune__Exn.raise_with_backtrace in file
  "otherlibs/stdune/src/exn.ml" (inlined), line 38, characters 27-56
Called from Stdune__Exn_with_backtrace.reraise in file
  "otherlibs/stdune/src/exn_with_backtrace.ml", line 20, characters 33-71
Called from Fiber__Scheduler.exec in file "vendor/fiber/src/scheduler.ml",
  line 76, characters 8-11

I must not crash.  Uncertainty is the mind-killer. Exceptions are the
little-death that brings total obliteration.  I will fully express my cases.
Execution will pass over me and through me.  And when it has gone past, I
will unwind the stack along its path.  Where the cases are handled there will
be nothing.  Only I will remain.

Reproduction

(pin
 (url "git+https://github.com/FStarLang/FStar.git")
 (package
  (name fstar)))

(package (name repro) (depends fstar))

Specifications

• Version of dune (output of dune --version): n/a, off head, commit f7af2d0
• Version of ocaml (output of ocamlc --version): 4.14.2
• Operating system (distribution and version): MacOS Sequoia 15.0.1

Additional information

Contents of _build/log

# dune pkg lock
# OCAMLPARAM: unset
# Shared cache: enabled
# Shared cache location: /Users/rmu/.cache/dune/db
# Workspace root: /Users/rmu/Projects/ae.dev71/yap/implementation
# Auto-detected concurrency: 12
$ /nix/store/4axvrmlyszz77x66am0damj6pz4jh683-coreutils-9.5/bin/uname -m > /tmp/dune_e70ac3_output
$ /nix/store/4axvrmlyszz77x66am0damj6pz4jh683-coreutils-9.5/bin/uname -s > /tmp/dune_13a133_output
$ /usr/bin/sw_vers -productVersion > /tmp/dune_ca7e7b_output
$ /nix/store/h75ikbc9x19sqjaqljkigfa95qms4mi7-ocaml-4.14.2/bin/ocamlc -vnum > /tmp/dune_dd769a_output
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git ls-remote https://github.com/ocaml-dune/opam-overlays.git) > /tmp/dune_25f023_output
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git cat-file -e 9bad4501e6dd4feb7b61b48d29812241d1d711f9)
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git ls-tree -z --long -r 9bad4501e6dd4feb7b61b48d29812241d1d711f9) > /tmp/dune_68e8fe_output
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git cat-file -e 9bad4501e6dd4feb7b61b48d29812241d1d711f9:.gitmodules)
[128]
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git ls-remote https://github.com/ocaml/opam-repository.git) > /tmp/dune_c12960_output
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git cat-file -e f2ad0ff0828e004becfa81125abd41bc53e42d56)
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git ls-tree -z --long -r f2ad0ff0828e004becfa81125abd41bc53e42d56) > /tmp/dune_a5a1b8_output
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git cat-file -e f2ad0ff0828e004becfa81125abd41bc53e42d56:.gitmodules)
[128]
$ (cd /Users/rmu/.cache/dune/git-repo && /etc/profiles/per-user/rmu/bin/git ls-remote https://github.com/FStarLang/FStar.git) > /tmp/dune_b219e1_output

[Leonidas-from-XIV]

Thanks for the report! I've looked into this and the issue is not the size of ls-remote but the fact that the repo has a tag that is the same as the name of a branch (v0.9.5.0). I'll update the title of the issue accordingly.

I've created a repro case in #11120.