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Trusting the CA was previously "import ca.pem into whatever's making
the requests" with no further help. -install-ca generates the CA if
needed and prints copy-pasteable, OS-specific steps, then exits without
starting the proxy.
Deliberately instructions-only, never auto-executing anything: Linux
trust-store tooling varies enough across distros (trust vs
update-ca-trust vs update-ca-certificates) that guessing wrong and
running the wrong command unattended is worse than asking, and
installing a root CA is a system-wide trust change affecting every TLS
connection on the machine, not just mitmux's own traffic - running the
printed command themselves keeps the user in control of that.
internal/ca/install.go: InstallInstructions(goos, caPath) dispatches by
OS. Linux detects trust (p11-kit - Arch, also on Fedora) /
update-ca-trust (RHEL/Fedora/CentOS) / update-ca-certificates
(Debian/Ubuntu/Gentoo) via PATH lookup and prints whichever is actually
present, plus separate certutil/NSS instructions for Firefox/Chrome's
own certificate store (which doesn't always follow the system trust
store on Linux). macOS (security add-trusted-cert) and Windows
(certutil -addstore / Import-Certificate) are implemented from each
platform's standard documented tooling but not verified live - no
macOS/Windows machine was available to test against, unlike Linux.
commandExists is a package var (not a direct exec.LookPath call) so
tests can fake which tools are "present" and exercise every detection
branch deterministically, independent of what's actually installed on
whatever machine runs `go test`.
Verified live: built mitmuxd, ran -install-ca against a throwaway CA
dir on this (Arch Linux) machine - correctly detected `trust` and
`certutil` on PATH and printed accurate commands, confirmed the CA
files were actually generated, confirmed no proxy/daemon process was
left running (exits immediately after printing), and confirmed running
it a second time reuses the existing CA (identical file hash) rather
than regenerating.
go build/vet/gofmt/test/mod tidy all clean.
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