Assume git repo URL fragment of 40 hex digits is a commit id

2 files changed, 23 insertions, 10 deletions

diff --git a/libbpkg/manifest.cxx b/libbpkg/manifest.cxx
index 81a9b8c..1c0650e 100644
--- a/libbpkg/manifest.cxx
+++ b/libbpkg/manifest.cxx
@@ -11,7 +11,7 @@
 #include <cstring>   // strncmp(), strcmp()
 #include <utility>   // move()
 #include <cstdint>   // uint16_t, UINT16_MAX
-#include <algorithm> // find(), replace()
+#include <algorithm> // find(), find_if_not(), replace()
 #include <stdexcept> // invalid_argument
 
 #include <libbutl/path.mxx>
@@ -1961,7 +1961,20 @@ namespace bpkg
           commit = string (s, p + 1);
       }
       else if (!s.empty ())
-        branch = s;
+      {
+        // A 40-characters fragment that consists of only hexadecimal digits is
+        // assumed to be a commit id.
+        //
+        if (s.size () == 40 &&
+            find_if_not (s.begin (), s.end (),
+
+                         // Resolve the required overload.
+                         //
+                         static_cast<bool (*)(char)> (xdigit)) == s.end ())
+          commit = s;
+        else
+          branch = s;
+      }
     }
 
     if (!branch && !commit)
diff --git a/tests/repository-location/driver.cxx b/tests/repository-location/driver.cxx
index e5a818a..ad3b0dd 100644
--- a/tests/repository-location/driver.cxx
+++ b/tests/repository-location/driver.cxx
@@ -754,16 +754,16 @@ namespace bpkg
     // Repository URL fragments.
     //
     {
-      loc ("https://www.example.com/test.git#master", repository_type::git);
-      loc ("https://www.example.com/test.git#master@", repository_type::git);
+      string branch ("master");
+      string commit ("0a53e9ddeaddad63ad106860237bbf53411d11a7");
 
-      loc ("https://www.example.com/test.git#"
-           "@0a53e9ddeaddad63ad106860237bbf53411d11a7",
-           repository_type::git);
+      assert (*git_reference (branch).branch == branch);
+      assert (*git_reference (commit + "@").branch == commit);
+      assert (*git_reference (commit).commit == commit);
+      assert (*git_reference ("@" + commit).commit == commit);
 
-      loc ("https://www.example.com/test.git#"
-           "master@0a53e9ddeaddad63ad106860237bbf53411d11a7",
-           repository_type::git);
+      git_reference r (branch + "@" + commit);
+      assert (*r.branch == branch && *r.commit == commit);
     }
 
     // repository_url