Concurrent vendir processes interfere with each other

[Zebradil]

What steps did you take:

I ran several vendir processes with the same working directory.

What happened:

At least one of the processes failed.

What did you expect:

Vendir successfully finishes the job.

Anything else you would like to add:

Test script:

#!/usr/bin/env bash

oldDir="$PWD"

cd "$(mktemp -d)" || exit

for i in {1..2}; do
    cat <<EOF | vendir sync -f - &
apiVersion: vendir.k14s.io/v1alpha1
kind: Config
directories:
- path: vendor/dest-$i
  contents:
  - path: .
    git:
      url: https://github.com/carvel-dev/ytt
      ref: v0.27.x
      depth: 1
    includePaths:
      - README.md
      - pkg/version/version.go
EOF
done

wait
find .
cd "$oldDir" || exit

Result:

$ bash test.sh
Fetching: vendor/dest-1 + . (git from https://github.com/carvel-dev/ytt@v0.27.x)

  --> git init
Fetching: vendor/dest-2 + . (git from https://github.com/carvel-dev/ytt@v0.27.x)

vendir: Error: Syncing directory 'vendor/dest-1':
  Syncing directory '.' with git contents:
    Fetching git repository:
      Git [init]: fork/exec /usr/bin/git: no such file or directory (stderr: )

vendir: Error: Syncing directory 'vendor/dest-2':
  Syncing directory '.' with git contents:
    Creating incoming dir '/tmp/tmp.VpBZuEtCGA/.vendir-tmp/incoming/git' for git: mkdir /tmp/tmp.VpBZuEtCGA/.vendir-tmp/incoming/git: no such file or directory
.

Environment:

• vendir version 0.38.0
• OS: latest Arch Linux x86_64

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