forge: Allow deep clone on derivation jobs.

* guix/forge/forge.scm (derivation-job-gexp): Accept #:deep-clone?
argument and pass on to latest-git-checkout.
* guix/forge/build/git.scm (download-git-to-store): Accept
#:deep-clone? argument, and deep clone the git repository if it is
#t. Explicitly specify the first commit to `git log' so that only the
first commit message is displayed.

2 files changed, 29 insertions, 14 deletions

diff --git a/guix/forge/build/git.scm b/guix/forge/build/git.scm
index 1434d07..098be83 100644
--- a/guix/forge/build/git.scm
+++ b/guix/forge/build/git.scm
@@ -40,10 +40,14 @@
   (newline)
   (force-output))
 
-(define* (download-git-to-store store name url #:key branch show-commit?)
+(define* (download-git-to-store store name url #:key branch show-commit? deep-clone?)
   "Download BRANCH of git repository from URL to STORE under NAME and
 return store path. If BRANCH is not specified, the default branch is
-downloaded. git and certificates should be in the environment."
+downloaded. git and certificates should be in the environment.
+
+If DEEP-CLONE? is #t, the git repository is deep cloned and the .git
+directory is included in the store. Else, the git repository is
+shallow cloned and the .git directory is not included."
   (call-with-temporary-directory
    (lambda (directory)
      (with-directory-excursion directory
@@ -55,21 +59,25 @@ downloaded. git and certificates should be in the environment."
                                   (invoke-error-exit-status condition))
                           (exit #f)))
          (apply invoke
-                "git" "clone" "--quiet" "--depth" "1"
-                ;; Append file:// to local repository path so that
-                ;; shallow clone works.
-                (if (string-prefix? "/" url)
-                    (string-append "file://" url)
-                    url)
-                (append (if branch
+                "git" "clone" "--quiet"
+                (append (if deep-clone?
+                            (list)
+                            (list "--depth" "1"))
+                        ;; Append file:// to local repository path so
+                        ;; that shallow clone works.
+                        (list (if (string-prefix? "/" url)
+                                  (string-append "file://" url)
+                                  url))
+                        (if branch
                             (list "--branch" branch)
                             (list))
                         (list "."))))
        (when show-commit?
          (hline)
-         (invoke "git" "--no-pager" "log")
+         (invoke "git" "log" "HEAD~1..HEAD")
          (hline))
-       (delete-file-recursively ".git"))
+       (unless deep-clone?
+         (delete-file-recursively ".git")))
      (add-to-store store name #t "sha256" directory))))
 
 (define latest-git-checkout
diff --git a/guix/forge/forge.scm b/guix/forge/forge.scm
index e88edb0..f8acc80 100644
--- a/guix/forge/forge.scm
+++ b/guix/forge/forge.scm
@@ -156,15 +156,21 @@
     (name (guix-module-name? name))))
 
 (define* (derivation-job-gexp project job gexp-producer
-                              #:key (guix-daemon-uri (%daemon-socket-uri)))
+                              #:key (guix-daemon-uri (%daemon-socket-uri)) deep-clone?)
   "Return a G-expression that builds another G-expression as a
 derivation and returns its output path. GEXP-PRODUCER is a
 G-expression that expands to a lambda function. The lambda function
 takes one argument---the latest git checkout of PROJECT, a
 <forge-project> object---and returns a G-expression describing a
 derivation to run. JOB is a <forge-laminar-job> object representing
-the job that this derivation will be part of. GUIX_DAEMON_URI is a
-file name or URI designating the Guix daemon endpoint."
+the job that this derivation will be part of.
+
+GUIX_DAEMON_URI is a file name or URI designating the Guix daemon
+endpoint.
+
+If DEEP-CLONE? is #t, the git checkout is a deep clone of the
+repository that includes the .git directory. Else, it is a shallow
+clone and does not include the .git directory."
   (with-imported-modules (source-module-closure '((forge build git)
                                                   (guix gexp)
                                                   (guix profiles))
@@ -209,6 +215,7 @@ file name or URI designating the Guix daemon endpoint."
                                                                   #$(string-append (forge-project-name project)
                                                                                    "-checkout")
                                                                   #$(forge-project-repository project)
+                                                                  #:deep-clone? #$deep-clone?
                                                                   #:show-commit? #t))
                                                    (drv (gexp->derivation #$(string-append
                                                                              (forge-laminar-job-name job)