Support transcrypt (#197)

Support is inherently provided by `enter`, which supports a command.
I've added a `transcrypt` command, which is really just an alias
under-the-hood for "enter transcrypt".

test/conftest.py

@@ -96,6 +96,7 @@ def supported_commands():
         'introspect',
         'list',
         'perms',
+        'transcrypt',
         'upgrade',
         'version',
         ]

test/test_ext_crypt.py

@@ -1,4 +1,4 @@
-"""Test git-crypt"""
+"""Test external encryption commands"""
 
 import pytest
 
@@ -8,15 +8,21 @@ import pytest
     [False, 'installed', 'installed-but-failed'],
     ids=['not-installed', 'installed', 'installed-but-failed']
 )
-def test_git_crypt(runner, yadm, paths, tmpdir, crypt):
-    """git-crypt tests"""
+@pytest.mark.parametrize(
+        'cmd,var', [
+            ['git_crypt', 'GIT_CRYPT_PROGRAM'],
+            ['transcrypt', 'TRANSCRYPT_PROGRAM'],
+        ],
+        ids=['git-crypt', 'transcrypt'])
+def test_ext_encryption(runner, yadm, paths, tmpdir, crypt, cmd, var):
+    """External encryption tests"""
 
     paths.repo.ensure(dir=True)
     bindir = tmpdir.mkdir('bin')
-    pgm = bindir.join('test-git-crypt')
+    pgm = bindir.join('test-ext-crypt')
 
     if crypt:
-        pgm.write(f'#!/bin/sh\necho git-crypt ran\n')
+        pgm.write(f'#!/bin/sh\necho ext-crypt ran\n')
         pgm.chmod(0o775)
     if crypt == 'installed-but-failed':
         pgm.write('false\n', mode='a')
@@ -24,8 +30,8 @@ def test_git_crypt(runner, yadm, paths, tmpdir, crypt):
     script = f"""
         YADM_TEST=1 source {yadm}
         YADM_REPO={paths.repo}
-        GIT_CRYPT_PROGRAM="{pgm}"
-        git_crypt "param1"
+        {var}="{pgm}"
+        {cmd} "param1"
     """
 
     run = runner(command=['bash'], inp=script)
@@ -35,7 +41,7 @@ def test_git_crypt(runner, yadm, paths, tmpdir, crypt):
             assert run.failure
         else:
             assert run.success
-        assert run.out.strip() == 'git-crypt ran'
+        assert run.out.strip() == 'ext-crypt ran'
     else:
         assert run.failure
         assert f"command '{pgm}' cannot be located" in run.out

yadm

@@ -42,6 +42,7 @@ GPG_PROGRAM="gpg"
 GIT_PROGRAM="git"
 AWK_PROGRAM=("gawk" "awk")
 GIT_CRYPT_PROGRAM="git-crypt"
+TRANSCRYPT_PROGRAM="transcrypt"
 J2CLI_PROGRAM="j2"
 ENVTPL_PROGRAM="envtpl"
 LSB_RELEASE_PROGRAM="lsb_release"
@@ -86,7 +87,7 @@ function main() {
 
   # parse command line arguments
   local retval=0
-  internal_commands="^(alt|bootstrap|clean|clone|config|decrypt|encrypt|enter|git-crypt|help|init|introspect|list|perms|upgrade|version)$"
+  internal_commands="^(alt|bootstrap|clean|clone|config|decrypt|encrypt|enter|git-crypt|help|init|introspect|list|perms|transcrypt|upgrade|version)$"
   if [ -z "$*" ] ; then
     # no argumnts will result in help()
     help
@@ -934,6 +935,11 @@ function git_crypt() {
   enter "${GIT_CRYPT_PROGRAM} $*"
 }
 
+function transcrypt() {
+  require_transcrypt
+  enter "${TRANSCRYPT_PROGRAM} $*"
+}
+
 function enter() {
   command="$*"
   require_shell
@@ -1023,6 +1029,7 @@ Commands:
   yadm perms                 - Fix perms for private files
   yadm enter [COMMAND]       - Run sub-shell with GIT variables set
   yadm git-crypt [OPTIONS]   - Run git-crypt commands for the yadm repo
+  yadm transcrypt [OPTIONS]  - Run transcrypt commands for the yadm repo
 
 Files:
   \$HOME/.config/yadm/config    - yadm's configuration file
@@ -1083,6 +1090,7 @@ init
 introspect
 list
 perms
+transcrypt
 upgrade
 version
 EOF
@@ -1908,6 +1916,10 @@ function require_git_crypt() {
   command -v "$GIT_CRYPT_PROGRAM" &> /dev/null ||
     error_out "This functionality requires git-crypt to be installed, but the command '$GIT_CRYPT_PROGRAM' cannot be located."
 }
+function require_transcrypt() {
+  command -v "$TRANSCRYPT_PROGRAM" &> /dev/null ||
+    error_out "This functionality requires transcrypt to be installed, but the command '$TRANSCRYPT_PROGRAM' cannot be located."
+}
 function bootstrap_available() {
   [ -f "$YADM_BOOTSTRAP" ] && [ -x "$YADM_BOOTSTRAP" ] && return
   return 1