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feat: support tfenv use - to switch to previous version (#378) #483

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Merged
Zordrak merged 1 commit into from
Apr 24, 2026
Merged

feat: support tfenv use - to switch to previous version (#378) #483

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2 changes: 2 additions & 0 deletions lib/helpers.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,8 @@ function cleanup() {

log 'debug' "Deleting ${TFENV_CONFIG_DIR}/version";
rm -rf "${TFENV_CONFIG_DIR}/version";
log 'debug' "Deleting ${TFENV_CONFIG_DIR}/version.prev";
rm -rf "${TFENV_CONFIG_DIR}/version.prev";
log 'debug' "Deleting ${TFENV_CONFIG_DIR}/versions";
rm -rf "${TFENV_CONFIG_DIR}/versions";
log 'debug' "Deleting ${pwd}/.terraform-version";
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24 changes: 24 additions & 0 deletions libexec/tfenv-use
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Expand Up @@ -72,6 +72,18 @@ declare version_source_suffix="";
declare requested="${requested_arg}";
declare loaded_version_file="$(tfenv-version-file)";

# Handle 'tfenv use -' to switch to previous version
if [ "${requested_arg}" == '-' ]; then
declare prev_file="${TFENV_CONFIG_DIR}/version.prev";
[ -f "${prev_file}" ] \
|| log 'error' 'No previous version to switch to. Use tfenv use <version> first.';
requested_arg="$(cat "${prev_file}" | tr -d '\r')";
[ -n "${requested_arg}" ] \
|| log 'error' 'Previous version file is empty.';
requested="${requested_arg}";
log 'info' "Switching to previous version: ${requested_arg}";
fi;

if [ -z "${requested_arg}" -a -z "${TFENV_TERRAFORM_VERSION:-""}" ]; then
version_source_suffix=" (set by ${loaded_version_file})";

Expand Down Expand Up @@ -154,6 +166,18 @@ log 'debug' "target_path is ${TFENV_CONFIG_DIR}/versions/${installed_version}";

log 'info' "Switching default version to v${installed_version}";
version_file="${TFENV_CONFIG_DIR}/version";

# Save current version as previous before overwriting
if [ -f "${version_file}" ]; then
declare current_version;
current_version="$(cat "${version_file}" | tr -d '\r')" || true;
if [ -n "${current_version}" ] && [ "${current_version}" != "${installed_version}" ]; then
log 'debug' "Saving previous version '${current_version}' to ${version_file}.prev";
echo "${current_version}" > "${version_file}.prev" \
|| log 'warn' "Failed to save previous version to ${version_file}.prev";
fi;
fi;

log 'debug' "Writing \"${installed_version}\" to \"${version_file}\"";
echo "${installed_version}" > "${version_file}" \
|| log 'error' "Switch to v${installed_version} failed";
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47 changes: 47 additions & 0 deletions test/test_use_dash.sh
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@@ -0,0 +1,47 @@
#!/usr/bin/env bash

# Source common test setup
source "$(dirname "${0}")/test_common.sh";

#####################
# Begin Script Body #
#####################

declare -a errors=();

log 'info' '### Test Suite: tfenv use -';
cleanup || log 'error' 'Cleanup failed?!';

log 'info' '## Test: tfenv use - switches to previous version';
(
tfenv install 0.12.1 || exit 1;
tfenv install 0.12.2 || exit 1;

tfenv use 0.12.1 || exit 1;
check_active_version 0.12.1 || exit 1;

tfenv use 0.12.2 || exit 1;
check_active_version 0.12.2 || exit 1;

# Switch back to previous
tfenv use - || exit 1;
check_active_version 0.12.1 || exit 1;

# Switch back again
tfenv use - || exit 1;
check_active_version 0.12.2 || exit 1;
) && log 'info' '## Test passed: tfenv use - switches to previous version' \
|| error_and_proceed 'tfenv use - switches to previous version';

log 'info' '## Test: tfenv use - fails with no previous version';
cleanup || log 'error' 'Cleanup failed?!';
(
tfenv install 0.12.1 || exit 1;
# No previous version set yet — use - should fail
tfenv use - 2>/dev/null && exit 1 || exit 0;
) && log 'info' '## Test passed: tfenv use - fails with no previous version' \
|| error_and_proceed 'tfenv use - fails with no previous version';

finish_tests 'use-dash';
exit 0;
# vim: set ts=2 sw=2 et:
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