shithub: git9

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git/clone: allow cloning a single branch.

Sometimes you only need one branch from a repo. This
was a pain in the ass before, involving initializing
the repository, pulling to get the hashes, and then
manually creating the branch because the empty repo
had no valid branches, so branch switchnig broke.

The change to support this was trivial, so why not.

--- a/clone

+++ b/clone

@@ -2,7 +2,7 @@

 rfork en

 . /sys/lib/git/common.rc

-flagfmt='d:debug'; args='remote [local]'

+flagfmt='d:debug, b:branch branch'; args='remote [local]'

 eval `''{aux/getflags $*} || exec aux/usage

 if(~ $debug 1)

 	debug=(-d)

@@ -14,6 +14,8 @@

 	exec aux/usage

 if(~ $#local 0)

 	local=`{basename $remote .git}

+if(~ $#branch 1)

+	branchflag=(-b $branch)

 if(test -e $local)

 	die 'repository already exists:' $local

@@ -29,18 +31,16 @@

 	>>.git/config {

 		echo '[remote "origin"]'

 		echo '	url='$remote

-		echo '	fetch=+refs/heads/*:refs/remotes/origin/*'

 	}

-	{git/fetch $debug $remote >[2=3] | awk '

+	{git/fetch  $debug $branchflag $remote >[2=3] | awk '

 		BEGIN{

-			headref=""

+			headref="refs/remotes/origin/"ENVIRON["branch"]

 			headhash=""

 		}

-		/^symref /{

+		/^symref / && headref == "" {

 			if($2 == "HEAD"){

 				gsub("^refs/heads", "refs/remotes/origin", $3)

 				gsub("^refs/tags", "refs/remotes/origin/tags", $3)

-				headref=$3

 			}

 		}

 		/^remote /{

@@ -92,7 +92,7 @@

 		}

 	}

 	if not{

-		echo no master branch >[1=2]

+		echo no default branch >[1=2]

 		echo check out your code with git/branch >[1=2]

 	}

 }