podman

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#!/usr/bin/env bash
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#
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# podman-try - try running a command via PODMAN1; use PODMAN2 as fallback
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#
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# Intended for use with a podmanv2 client. If a command isn't yet
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# implemented, fall back to regular podman:
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#
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#    Set PODMAN_V2 to the path to a podman v2 client
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#    Set PODMAN_FALLBACK to the path to regular podman
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#
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# THIS IS IMPERFECT. In particular, it will not work if stdin is redirected
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# (e.g. 'podman ... < file' or 'something | podman'); nor for anything
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# that generates continuous output ('podman logs -f'); and probably more
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# situations.
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#
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die() {
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    echo "$(basename $0): $*" >&2
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    exit 1
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}
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test -n "$PODMAN_V2"       || die "Please set \$PODMAN_V2 (path to podman v2)"
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test -n "$PODMAN_FALLBACK" || die "Please set \$PODMAN_FALLBACK (path to podman)"
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result=$(${PODMAN_V2} "$@" 2>&1)
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rc=$?
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if [ $rc == 125 ]; then
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    if [[ "$result" =~ unrecognized\ command|unknown\ flag|unknown\ shorthand ]]; then
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        result=$(${PODMAN_FALLBACK} "$@")
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        rc=$?
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    fi
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fi
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echo -n "$result"
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exit $rc
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