results: Use git rev-parse for getting commit hash

This solve error when parsing detached head commit

Signed-off-by: Arisu Tachibana <arisu.tachibana@miraclelinux.com>

Author: aliceinwire

docs/results.md

@@ -96,7 +96,7 @@ kci-dev results build --giturl 'https://git.kernel.org/pub/scm/linux/kernel/git/
 
 If used without arguments, `kci-dev results` subcommands will get KernelCI status
 of local checked out git repository for commands that require a giturl and branch.
-In the following example, kci-dev is used on a local linux repository folder
+In the following example, kci-dev is used on a local linux repository folder.
 This command work with every linux repository supported by KernelCI
 
 ```sh
@@ -105,7 +105,6 @@ git folder: None
 tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
 branch: master
 commit: fbfd64d25c7af3b8695201ebc85efe90be28c5a3
-
 pass/fail/inconclusive
 builds: 46/0/0
 boots:  580/48/8
@@ -117,14 +116,31 @@ tests:  7858/6903/654
 Get results automatically from a folder with a local linux repository.
 
 ```sh
-kci-dev git:(master)$ kci-dev results --git-folder ../linux
+kci-dev git:(master)$ kci-dev results summary --git-folder ../linux
 git folder: ../linux
 tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
 branch: master
 commit: fbfd64d25c7af3b8695201ebc85efe90be28c5a3
-
 pass/fail/inconclusive
 builds: 46/0/0
 boots:  580/48/8
 tests:  7858/6903/654
 ```
+
+## --branch
+
+In the case of the script not been able to get the current branch information,  
+like in the case of a detached HEAD, it is possible to specify a branch.  
+Like in the following case:  
+
+```sh
+linux-cip git:(6077b17f20b1) kci-dev results summary --branch linux-5.10.y-cip
+git folder: None
+tree: https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git
+branch: linux-5.10.y-cip
+commit: 6077b17f20b1bcfeccaa23bc05573b938c47679d
+pass/fail/inconclusive
+builds: 21/0/0
+boots:  440/36/18
+tests:  1190/184/100
+```

kcidev/subcommands/results.py

@@ -74,7 +74,7 @@ def is_inside_work_tree(git_folder):
     return False
 
 
-def get_folder_repository(git_folder):
+def get_folder_repository(git_folder, branch):
     kci_msg("git folder: " + str(git_folder))
     if git_folder:
         current_folder = git_folder
@@ -109,12 +109,15 @@ def get_folder_repository(git_folder):
         )
         branch_name, branch_error = process.communicate()
         branch_name = branch_name.strip()
+        if branch:
+            branch_name = branch
 
         # Get last commit hash
-        last_commit_hash_path = os.path.join(
-            dot_git_folder, "refs", "heads", branch_name
+        process = subprocess.Popen(
+            ["git", "rev-parse", "HEAD"], stdout=subprocess.PIPE, text=True
         )
-        last_commit_hash = open(last_commit_hash_path, "r").read()
+        last_commit_hash, last_commit_hash_error = process.communicate()
+        last_commit_hash = last_commit_hash.strip()
 
         os.chdir(previous_folder)
         kci_msg("tree: " + git_url)
@@ -240,7 +243,7 @@ def cmd_builds(data, commit, download_logs, status):
 
 def set_giturl_branch_commit(origin, giturl, branch, commit, latest, git_folder):
     if not giturl or not branch or not ((commit != None) ^ latest):
-        giturl, branch, commit = get_folder_repository(git_folder)
+        giturl, branch, commit = get_folder_repository(git_folder, branch)
     if latest:
         commit = get_latest_commit(origin, giturl, branch)
     return giturl, branch, commit