Add warning for older micromamba versions

.github/workflows/test.yml

@@ -42,7 +42,7 @@ jobs:
           micromamba info | grep -q "environment : None (not found)"
         shell: bash -el {0}
 
-  micromamba-old-version:
+  micromamba-old-version-1:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -53,6 +53,17 @@ jobs:
       - run: test "$(micromamba --version)" = 1.4.5
         shell: bash -el {0}
 
+  micromamba-old-version-2:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./
+        with:
+          micromamba-version: 1.2.0-1 # this will throw a warning
+          environment-file: 'test/environment.yml'
+      - run: test "$(micromamba --version)" = 1.2.0
+        shell: bash -el {0}
+
   micromamba-shell:
     strategy:
       matrix:

src/options.ts

@@ -182,6 +182,24 @@ const assertOptions = (options: Options) => {
   assert(!options.createEnvironment || options.environmentFile !== undefined || options.environmentName !== undefined)
 }
 
+export const getRootPrefixFlagForInit = (options: Options) => {
+  // latest is always > 1.4.5-0
+  if (options.micromambaSource._tag === 'Left' && options.micromambaSource.left < '1.4.5-0') {
+    return '-p'
+  }
+  return '-r'
+}
+
+const checkForKnownIssues = (options: Options) => {
+  // micromamba 1.4.5 now uses -r for shell init instead of -p
+  // https://github.com/mamba-org/mamba/pull/2538
+  if (options.initShell && getRootPrefixFlagForInit(options) === '-p') {
+    core.warning(
+      'You are using a micromamba version < 1.4.5-0 and initialize the shell. This is behavior is deprecated. Please update the micromamba version. For further informations, see https://github.com/mamba-org/setup-micromamba/pull/107'
+    )
+  }
+}
+
 const getOptions = () => {
   const inputs: Inputs = {
     condarcFile: parseOrUndefined('condarc-file', z.string()),
@@ -209,6 +227,7 @@ const getOptions = () => {
   validateInputs(inputs)
   const options = inferOptions(inputs)
   core.debug(`Inferred options: ${JSON.stringify(options)}`)
+  checkForKnownIssues(options)
   assertOptions(options)
   return options
 }

src/shell-init.ts

@@ -4,7 +4,7 @@ import path from 'path'
 import * as coreDefault from '@actions/core'
 import { coreMocked } from './mocking'
 import { execute, mambaRegexBlock, micromambaCmd } from './util'
-import { PATHS, options } from './options'
+import { PATHS, getRootPrefixFlagForInit, options } from './options'
 import type { ShellType } from './options'
 
 const core = process.env.MOCKING ? coreMocked : coreDefault
@@ -38,8 +38,13 @@ const removeMambaInitBlockFromBashProfile = () => {
 
 export const shellInit = (shell: string) => {
   core.startGroup(`Initialize micromamba for ${shell}.`)
+  const rootPrefixFlag = getRootPrefixFlagForInit(options)
   const command = execute(
-    micromambaCmd(`shell init -s ${shell} -r ${options.micromambaRootPath}`, options.logLevel, options.condarcFile)
+    micromambaCmd(
+      `shell init -s ${shell} ${rootPrefixFlag} ${options.micromambaRootPath}`,
+      options.logLevel,
+      options.condarcFile
+    )
   )
   if (os.platform() === 'linux' && shell === 'bash') {
     return command.then(copyMambaInitBlockToBashProfile).finally(core.endGroup)
@@ -49,8 +54,13 @@ export const shellInit = (shell: string) => {
 
 export const shellDeinit = (shell: string) => {
   core.startGroup(`Deinitialize micromamba for ${shell}`)
+  const rootPrefixFlag = getRootPrefixFlagForInit(options)
   const command = execute(
-    micromambaCmd(`shell deinit -s ${shell} -r ${options.micromambaRootPath}`, options.logLevel, options.condarcFile)
+    micromambaCmd(
+      `shell deinit -s ${shell} ${rootPrefixFlag} ${options.micromambaRootPath}`,
+      options.logLevel,
+      options.condarcFile
+    )
   )
   if (os.platform() === 'linux' && shell === 'bash') {
     return command.then(removeMambaInitBlockFromBashProfile).finally(core.endGroup)