Before this fix using --sftp-ssh with the sftp backend could leave
zombie processes.
This patch fixes the problem that sshClientExternal.session was never
assigned, so Wait() always returned nil without waiting for the SSH
process to exit. This caused zombie processes because the process was
never reaped.
It also ensures that Wait() is only called once on each process.
I gave this issue to Copilot to fix as an experiment. It went off in
the wrong direction to start with and fixed something which wasn't the
problem but still needed fixing. With a bit of a nudge it fixed the
correct problem too.
Co-authored-by: Nick Craig-Wood <nick@craig-wood.com>
This commit modernizes Go usage. This was done with:
go run golang.org/x/tools/gopls/internal/analysis/modernize/cmd/modernize@latest -fix -test ./...
Then files needed to be `go fmt`ed and a few comments needed to be
restored.
The modernizations include replacing
- if/else conditional assignment by a call to the built-in min or max functions added in go1.21
- sort.Slice(x, func(i, j int) bool) { return s[i] < s[j] } by a call to slices.Sort(s), added in go1.21
- interface{} by the 'any' type added in go1.18
- append([]T(nil), s...) by slices.Clone(s) or slices.Concat(s), added in go1.21
- loop around an m[k]=v map update by a call to one of the Collect, Copy, Clone, or Insert functions from the maps package, added in go1.21
- []byte(fmt.Sprintf...) by fmt.Appendf(nil, ...), added in go1.19
- append(s[:i], s[i+1]...) by slices.Delete(s, i, i+1), added in go1.21
- a 3-clause for i := 0; i < n; i++ {} loop by for i := range n {}, added in go1.22
This allows using an external ssh binary instead of the built in ssh
library for making SFTP connections.
This makes another integration test target TestSFTPRcloneSSH:
Fixes#7012
