bug#66305: Error with recursive git checkout

[Guillaume Le Vaillant]

Hi.

With Guix at 47d0346553fdad9795c9390a60944ccaad7e5255, I'm unable to
build a package (see attached patch) requiring a recursive git-fetch to
get the sources:

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix build bladerf
The following derivations will be built:
  /gnu/store/982zz7z94va89fxn79hpjil5wp0v49pn-bladerf-2023.02.drv
  /gnu/store/5rlqf4srlnnymsv93ydxkgxwgfszkszw-bladerf-2023.02-checkout.drv
building 
/gnu/store/5rlqf4srlnnymsv93ydxkgxwgfszkszw-bladerf-2023.02-checkout.drv...
Initialized empty Git repository in 
/gnu/store/fhlm9zxs4r4cgapbngckpzrs8rnzf1l2-bladerf-2023.02-checkout/.git/
From https://github.com/Nuand/bladeRF
 * tag               2023.02    -> FETCH_HEAD
Note: switching to 'FETCH_HEAD'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 41ef634 Revert "libbladeRF: update compatibility for FPGA 
v0.15.0 from libbladeRF 2.4.0 to 2.5.0"
/gnu/store/y3vdq2pdkljrw63xxnc2vb6lz07ycar6-git-minimal-2.41.0/libexec/git-core/git-submodule:
 line 7: basename: command not found
/gnu/store/y3vdq2pdkljrw63xxnc2vb6lz07ycar6-git-minimal-2.41.0/libexec/git-core/git-submodule:
 line 7: sed: command not found
/gnu/store/y3vdq2pdkljrw63xxnc2vb6lz07ycar6-git-minimal-2.41.0/libexec/git-core/git-sh-setup:
 line 77: basename: command not found
/gnu/store/y3vdq2pdkljrw63xxnc2vb6lz07ycar6-git-minimal-2.41.0/libexec/git-core/git-sh-setup:
 line 77: sed: command not found
/gnu/store/y3vdq2pdkljrw63xxnc2vb6lz07ycar6-git-minimal-2.41.0/libexec/git-core/git-sh-setup:
 line 292: uname: command not found
/gnu/store/y3vdq2pdkljrw63xxnc2vb6lz07ycar6-git-minimal-2.41.0/libexec/git-core/git-submodule:
 line 613: sed: command not found
/gnu/store/y3vdq2pdkljrw63xxnc2vb6lz07ycar6-git-minimal-2.41.0/libexec/git-core/git-submodule:
 line 613: cmd_: command not found
git-fetch: 
'/gnu/store/y3vdq2pdkljrw63xxnc2vb6lz07ycar6-git-minimal-2.41.0/bin/git 
submodule update --init --recursive' failed with exit code 127
--8<---------------cut here---------------end--------------->8---

0001-gnu-Add-bladerf.patch
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