Change in flashrom[master]: git-hooks: Fix install script for various git versions

[Nico Huber (Code Review)]

Nico Huber has submitted this change and it was merged. ( https://review.coreboot.org/22971 )

Change subject: git-hooks: Fix install script for various git versions
......................................................................

git-hooks: Fix install script for various git versions

There are older versions of git-rev-parse that don't understand the
`--git-path` switch. Also, when the install script was written, git-
rev-parse had a bug when it wasn't run from the root directory. They
fixed the behaviour by now. To simplify things and not have to account
for that too, we just bail out when the script is run from a sub-
directory.

Change-Id: I7ee8d4d54db48f7207fe8abf895c7fbba7685ad2
Signed-off-by: Nico Huber 
Reviewed-on: https://review.coreboot.org/22971
Tested-by: build bot (Jenkins) 
Reviewed-by: David Hendricks 
---
M util/git-hooks/install.sh
1 file changed, 15 insertions(+), 5 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  David Hendricks: Looks good to me, approved

diff --git a/util/git-hooks/install.sh b/util/git-hooks/install.sh
index d557c2f..fda0098 100755
--- a/util/git-hooks/install.sh
+++ b/util/git-hooks/install.sh
@@ -3,18 +3,28 @@
 root=$(git rev-parse --show-cdup 2>/dev/null) || \
      { echo "Not under git control. Cannot install git hooks." >&2 ; exit 0 ; }

-dst="${root}"$(git rev-parse --git-path hooks/)
+[ -z "${root}" ] || \
+     { echo "Not in root directory. Can only run from git root." >&2 ; exit 1 ; }
+
 src=util/git-hooks/ # relative to root
-hooks=$(cd "${root}${src}" && git ls-files -c | grep -Ev 'install.sh|wrapper.sh')
+hooks=$(cd "${src}" && git ls-files -c | grep -Ev 'install.sh|wrapper.sh')
+
+if [ "$(git rev-parse --git-path 2>/dev/null)" = "--git-path" ]; then
+	# very old git, we have to guess
+	dst=".git/hooks/"
+	rel="../../"
+else
+	dst=$(git rev-parse --git-path hooks/)
+	rel=$(git rev-parse --prefix "${dst}" --show-cdup)
+fi

for h in $hooks; do
    # Test if hook is not already installed, i.e. doesn't point at the wrapper
-	if [ ! "${dst}$h" -ef "${root}${src}wrapper.sh" ]; then
+	if [ ! "${dst}$h" -ef "${src}wrapper.sh" ]; then
    	# preserve custom hooks if any
    	if [ -e "${dst}$h" ]; then
    		mv "${dst}$h" "${dst}$h.local"
    	fi
-		ln -s "$(git rev-parse --prefix $(git rev-parse --git-path hooks/) --show-cdup)${src}wrapper.sh" \
-		      "${dst}$h"
+		ln -s "${rel}${src}wrapper.sh" "${dst}$h"
    fi
 done