[PATCH 3/3] contrib/hooks: add an example pre-auto-gc hook

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It disables git-gc --auto when you are running Linux and you are on
battery.

Signed-off-by: Miklos Vajna <vmiklos@xxxxxxxxxxxxxx>
---
 contrib/hooks/pre-auto-gc-battery |   39 +++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)
 create mode 100644 contrib/hooks/pre-auto-gc-battery

diff --git a/contrib/hooks/pre-auto-gc-battery b/contrib/hooks/pre-auto-gc-battery
new file mode 100644
index 0000000..0084a1f
--- /dev/null
+++ b/contrib/hooks/pre-auto-gc-battery
@@ -0,0 +1,39 @@
+#!/bin/sh
+#
+# An example hook script to verify if you are on battery, in case you
+# are running Linux. Called by git-gc --auto with no arguments. The hook
+# should exit with non-zero status after issuing an appropriate message
+# if it wants to stop the auto repacking.
+#
+# This hook is stored in the contrib/hooks directory. Your distribution
+# may have put this somewhere else. If you want to use this hook, you
+# should make this script executable then link to it in the repository
+# you would like to use it in.
+#
+# For example, if the hook is stored in
+# /usr/share/git-core/contrib/hooks/pre-auto-gc-battery:
+#
+# chmod a+x pre-auto-gc-battery
+# cd /path/to/your/repository.git
+# ln -sf /usr/share/git-core/contrib/hooks/pre-auto-gc-battery \
+#	hooks/pre-auto-gc
+
+if test -x /sbin/on_ac_power && /sbin/on_ac_power
+then
+	/sbin/on_ac_power
+	if [ $? = 1 ]; then
+		exit 0
+	fi
+elif test "$(cat /sys/class/power_supply/AC/online 2>/dev/null)" = 1
+then
+	exit 0
+elif grep -q 'on-line' /proc/acpi/ac_adapter/AC/state 2>/dev/null
+then
+	exit 0
+elif grep -q '0x01$' /proc/apm 2>/dev/null
+then
+	exit 0
+fi
+
+echo "Auto packing deferred; on battery"
+exit 1
-- 
1.5.5.rc2.4.gec07.dirty

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