1 files changed, 52 insertions, 0 deletions
diff --git a/src/analyze/analyze-compare-versions.c b/src/analyze/analyze-compare-versions.c
new file mode 100644
index 0000000..94cff18
--- /dev/null
+++ b/src/analyze/analyze-compare-versions.c
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <stdio.h>
+
+#include "analyze-compare-versions.h"
+#include "compare-operator.h"
+#include "macro.h"
+#include "string-util.h"
+#include "strv.h"
+
+int verb_compare_versions(int argc, char *argv[], void *userdata) {
+        const char *v1 = ASSERT_PTR(argv[1]), *v2 = ASSERT_PTR(argv[argc-1]);
+        int r;
+
+        assert(IN_SET(argc, 3, 4));
+        assert(argv);
+
+        /* We only output a warning on invalid version strings (instead of failing), since the comparison
+         * functions try to handle invalid strings gracefully and it's still interesting to see what the
+         * comparison result will be. */
+        if (!version_is_valid_versionspec(v1))
+                log_warning("Version string 1 contains disallowed characters, they will be treated as separators: %s", v1);
+        if (!version_is_valid_versionspec(v2))
+                log_warning("Version string 2 contains disallowed characters, they will be treated as separators: %s", v2);
+
+        if (argc == 3) {
+                r = strverscmp_improved(v1, v2);
+                printf("%s %s %s\n",
+                       isempty(v1) ? "''" : v1,
+                       comparison_operator(r),
+                       isempty(v2) ? "''" : v2);
+
+                /* This matches the exit convention used by rpmdev-vercmp.
+                 * We don't use named values because 11 and 12 don't have names. */
+                return r < 0 ? 12 : r > 0 ? 11 : 0;
+
+        } else {
+                const char *op = ASSERT_PTR(argv[2]);
+                CompareOperator operator;
+                assert(argc == 4);
+
+                operator = parse_compare_operator(&op, COMPARE_ALLOW_TEXTUAL);
+                if (operator < 0 || !isempty(op))
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown operator \"%s\".", op);
+
+                r = version_or_fnmatch_compare(operator, v1, v2);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to compare versions: %m");
+
+                return r ? EXIT_SUCCESS : EXIT_FAILURE;
+        }
+}