./v up deletes itself when .git is missing

[skull-squadron]

Describe the bug

v be:

Reproduction Steps

cd {{tmpdir}}
git clone https://github.com/vlang/v --depth 1
cd v
make -j
mv .{,x}git
./v up

Expected Behavior

No-op

$ ls
CHANGELOG.md        CONTRIBUTING.md  Dockerfile.alpine  GNUmakefile  Makefile   ROADMAP.md  bench          cmd  examples  thirdparty  v      vc
CODE_OF_CONDUCT.md  Dockerfile       Dockerfile.cross   LICENSE      README.md  TESTS.md    changelogs0.x  doc  make.bat  tutorials   v.mod  vlib

Current Behavior

Updating V...
V is already updated.
Current V version: sh: {{tmpdir}}/v/v: No such file or directory
$ ls
CHANGELOG.md        CONTRIBUTING.md  Dockerfile.alpine  GNUmakefile  Makefile   ROADMAP.md  bench          cmd  examples  thirdparty  v.mod  vlib
CODE_OF_CONDUCT.md  Dockerfile       Dockerfile.cross   LICENSE      README.md  TESTS.md    changelogs0.x  doc  make.bat  tutorials   vc
$

Possible Solution

Fix attached shortly

Additional Information/Context

No response

V version

0.4.3 01e6f64

Environment details (OS name and version, etc.)

V full version: V 0.4.3 01e6f64
OS: macos, macOS, 14.1.1, 23B81
Processor: 10 cpus, 64bit, little endian, Apple M1 Max

getwd: {{tmpdir}}/v
vexe: {{tmpdir}}/v/v
vexe mtime: 2023-11-22 01:13:49

vroot: OK, value: {{tmpdir}}/v
VMODULES: OK, value: /Users/ba/.vmodules
VTMP: OK, value: /tmp/v_501

Git version: git version 2.42.1
Git vroot status: weekly.2023.45.1-101-g01e6f647
.git/config present: true

CC version: Apple clang version 15.0.0 (clang-1500.0.40.1)
thirdparty/tcc status: thirdparty-macos-arm64 a668e5a0

Note

You can use the 👍 reaction to increase the issue's priority for developers.

Please note that only the 👍 reaction to the issue itself counts as a vote.
Other reactions and those to comments will not be taken into account.