[gentoo-dev] [PATCH git-r3 04/10] Support EGIT_MIRROR_URI to specify local git mirror.

[Michał Górny]

When multiple Gentoo machines are used on the local network, and they
use the same git ebuilds it may be useful to set a local mirror :).

The idea is quite simple -- you set the host to EGIT_CLONE_TYPE=mirror,
and then share the EGIT3_STORE_DIR directory. Then you set
EGIT_MIRROR_URI on the remaining hosts and they try to fetch from your
local mirror first.
---
 eclass/git-r3.eclass | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/eclass/git-r3.eclass b/eclass/git-r3.eclass
index 7c78b66..8462fba 100644
--- a/eclass/git-r3.eclass
+++ b/eclass/git-r3.eclass
@@ -41,6 +41,20 @@ fi
 #
 # EGIT3_STORE_DIR=${DISTDIR}/git3-src
 
+# @ECLASS-VARIABLE: EGIT_MIRROR_URI
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# 'Top' URI to a local git mirror. If specified, the eclass will try
+# to fetch from the local mirror instead of using the remote repository.
+#
+# The mirror needs to follow EGIT3_STORE_DIR structure. The directory
+# created by eclass can be used for that purpose.
+#
+# Example:
+# @CODE
+# EGIT_MIRROR_URI="git://mirror.lan/"
+# @CODE
+
 # @ECLASS-VARIABLE: EGIT_REPO_URI
 # @REQUIRED
 # @DESCRIPTION:
@@ -358,6 +372,14 @@ git-r3_fetch() {
 	local -x GIT_DIR
 	_git-r3_set_gitdir "${repos[0]}"
 
+	# prepend the local mirror if applicable
+	if [[ ${EGIT_MIRROR_URI} ]]; then
+		repos=(
+			"${EGIT_MIRROR_URI%/}/${GIT_DIR##*/}"
+			"${repos[@]}"
+		)
+	fi
+
 	# try to fetch from the remote
 	local r success
 	for r in "${repos[@]}"; do
-- 
1.8.3.2