Micromamba improvement (#148)1.7.0

* Update micromamba installation logic

* Split installation from micromamba() into micromamba_install()
* Return -1 when micromamba cannot be installed
* Add stasis.ini option "indexer.micromamba_download_url"
* Add global variable micromamba_download_url
* The installation function attempts two known-good URLs by default
*

* Add indexer arugment '--micromamba-download-url'

* Add is_file_compressed() function to utils
* Call micromamba_install() from tests

* Add space in usage statement

* Fix usage output when option array contains arguments without short options

* Add --micromamba-download-url to README.md

4 files changed, 52 insertions, 5 deletions

diff --git a/src/cli/stasis_indexer/args.c b/src/cli/stasis_indexer/args.c
index 0d0e9b9..440c671 100644
--- a/src/cli/stasis_indexer/args.c
+++ b/src/cli/stasis_indexer/args.c
@@ -7,6 +7,7 @@ struct option long_options[] = {
     {"verbose", no_argument, 0, 'v'},
     {"unbuffered", no_argument, 0, 'U'},
     {"web", no_argument, 0, 'w'},
+    {"micromamba-download-url", required_argument, 0, OPT_MICROMAMBA_DOWNLOAD_URL},
     {0, 0, 0, 0},
 };
 
@@ -16,6 +17,7 @@ const char *long_options_help[] = {
     "Increase output verbosity",
     "Disable line buffering",
     "Generate HTML indexes (requires pandoc)",
+    "Set micromamba download URL",
     NULL,
 };
 
@@ -26,17 +28,23 @@ void usage(char *name) {
         SYSERROR("Unable to allocate memory for options array");
         exit(1);
     }
-    for (int i = 0; i < maxopts; i++) {
-        opts[i] = (char) long_options[i].val;
+    for (int i = 0, n = 0; i < maxopts; i++) {
+        if (isalnum(long_options[i].val)) {
+            opts[n] = (char) long_options[i].val;
+            n++;
+        }
     }
-    printf("usage: %s [-%s] {{STASIS_ROOT}...}\n", name, opts);
+    printf("usage: %s [-%s] {{STASIS_ROOT} ...}\n", name, opts);
     guard_free(opts);
 
     for (int i = 0; i < maxopts - 1; i++) {
         char line[255] = {0};
-        snprintf(line, sizeof(line), "  --%s  -%c  %-20s", long_options[i].name, long_options[i].val, long_options_help[i]);
+        snprintf(line, sizeof(line), "  --%s  %s%c  %s",
+            long_options[i].name,
+            isalnum(long_options[i].val) ? "-" : "",
+            isalnum(long_options[i].val) ? long_options[i].val : ' ',
+            long_options_help[i]);
         puts(line);
     }
 
 }
-
diff --git a/src/cli/stasis_indexer/helpers.c b/src/cli/stasis_indexer/helpers.c
index 3ef96e4..b89622b 100644
--- a/src/cli/stasis_indexer/helpers.c
+++ b/src/cli/stasis_indexer/helpers.c
@@ -157,6 +157,7 @@ int micromamba_configure(const struct Delivery *ctx, struct MicromambaInfo *m) {
     m->conda_prefix = globals.conda_install_prefix;
     m->micromamba_prefix = micromamba_prefix;
     m->download_dir = ctx->storage.tmpdir;
+    m->download_url = globals.micromamba_download_url;
 
     const size_t pathvar_len = strlen(getenv("PATH")) + strlen(m->micromamba_prefix) + strlen(m->conda_prefix) + 3 + 4 + 1;
     // ^^^^^^^^^^^^^^^^^^
@@ -172,6 +173,11 @@ int micromamba_configure(const struct Delivery *ctx, struct MicromambaInfo *m) {
     setenv("PATH", pathvar, 1);
     guard_free(pathvar);
 
+    if (micromamba_install(m)) {
+        SYSERROR("Micromamba installation failed");
+        return -1;
+    }
+
     status += micromamba(m, "config prepend --env channels conda-forge");
     if (!globals.verbose) {
         status += micromamba(m, "config set --env quiet true");
diff --git a/src/cli/stasis_indexer/include/args.h b/src/cli/stasis_indexer/include/args.h
index 543aa4b..080863c 100644
--- a/src/cli/stasis_indexer/include/args.h
+++ b/src/cli/stasis_indexer/include/args.h
@@ -3,6 +3,8 @@
 
 #include <getopt.h>
 
+#define OPT_MICROMAMBA_DOWNLOAD_URL 1000
+
 extern struct option long_options[];
 void usage(char *name);
 
diff --git a/src/cli/stasis_indexer/stasis_indexer_main.c b/src/cli/stasis_indexer/stasis_indexer_main.c
index 45bbb6c..5d86f29 100644
--- a/src/cli/stasis_indexer/stasis_indexer_main.c
+++ b/src/cli/stasis_indexer/stasis_indexer_main.c
@@ -197,6 +197,13 @@ int main(const int argc, char *argv[]) {
             case 'w':
                 do_html = 1;
                 break;
+            case OPT_MICROMAMBA_DOWNLOAD_URL:
+                globals.micromamba_download_url = strdup(optarg);
+                if (!globals.micromamba_download_url) {
+                    SYSERROR("unable to allocate memory for micromamba_download_url");
+                    exit(1);
+                }
+                break;
             case '?':
             default:
                 exit(1);
@@ -309,6 +316,30 @@ int main(const int argc, char *argv[]) {
     printf(BANNER, version, AUTHOR);
     guard_free(version);
 
+    char *cfg_path = NULL;
+    if (asprintf(&cfg_path, "%s/stasis.ini", globals.sysconfdir) < 0) {
+        SYSERROR("Unable to allocate memory for cfg path");
+        exit(1);
+    }
+    ctx._stasis_ini_fp.cfg_path = cfg_path;
+    ctx._stasis_ini_fp.cfg = ini_open(ctx._stasis_ini_fp.cfg_path);
+    if (ctx._stasis_ini_fp.cfg) {
+        if (populate_delivery_cfg(&ctx, INI_READ_RENDER)) {
+            SYSERROR("Unable to apply stasis configuration");
+            exit(1);
+        }
+    }
+    else {
+        SYSWARN("Unable to open stasis configuration file: %s", cfg_path);
+    }
+
+    if (globals.micromamba_download_url && isempty(globals.micromamba_download_url)) {
+        // safeguard against supplying a zero-length URL
+        // this covers the case where the user supplied it as an argument and/or in the config file
+        SYSERROR("micromamba download URL cannot be empty");
+        exit(1);
+    }
+
     indexer_init_dirs(&ctx, workdir);
 
     msg(STASIS_MSG_L1, "%s delivery root %s\n",