[PATCHv4 3/3] Add sample commands for git-shell

[Greg Brockman <gdb@MIT.EDU>]

Provide a 'list' command to view available bare repositories ending in
.git and a 'help command to display usage.  Also add documentation in
a README

Signed-off-by: Greg Brockman <gdb@mit.edu>
---
 contrib/git-shell-commands/README |   18 ++++++++++++++++++
 contrib/git-shell-commands/help   |   16 ++++++++++++++++
 contrib/git-shell-commands/list   |   10 ++++++++++
 3 files changed, 44 insertions(+), 0 deletions(-)
 create mode 100644 contrib/git-shell-commands/README
 create mode 100755 contrib/git-shell-commands/help
 create mode 100755 contrib/git-shell-commands/list

This differs from v3 in that:

* the 'find' command in 'list' discards its stderr.  This is useful for
  avoiding noise from inaccessible directories or non-git repositories with
  name matching '*.git'.
* the README does not mention that commands will be run from $(pwd)/git-shell-commands,
  because they will now be run from $HOME/git-shell-commands.

diff --git a/contrib/git-shell-commands/README b/contrib/git-shell-commands/README
new file mode 100644
index 0000000..438463b
--- /dev/null
+++ b/contrib/git-shell-commands/README
@@ -0,0 +1,18 @@
+Sample programs callable through git-shell.  Place a directory named
+'git-shell-commands' in the home directory of a user whose shell is
+git-shell.  Then anyone logging in as that user will be able to run
+executables in the 'git-shell-commands' directory.
+
+Provided commands:
+
+help: Prints out the names of available commands.  When run
+interactively, git-shell will automatically run 'help' on startup,
+provided it exists.
+
+list: Displays any bare repository whose name ends with ".git" under
+user's home directory.  No other git repositories are visible,
+although they might be clonable through git-shell.  'list' is designed
+to minimize the number of calls to git that must be made in finding
+available repositories; if your setup has additional repositories that
+should be user-discoverable, you may wish to modify 'list'
+accordingly.
diff --git a/contrib/git-shell-commands/help b/contrib/git-shell-commands/help
new file mode 100755
index 0000000..a43fcd6
--- /dev/null
+++ b/contrib/git-shell-commands/help
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+if tty -s; then
+    echo "Run 'help' for help, or 'exit' to leave.  Available commands:"
+else
+    echo "Run 'help' for help.  Available commands:"
+fi
+
+cd "$(dirname "$0")"
+
+for cmd in *; do
+    case "$cmd" in
+	help) ;;
+	*) [ -f "$cmd" ] && [ -x "$cmd" ] && echo "$cmd" ;;
+    esac
+done
diff --git a/contrib/git-shell-commands/list b/contrib/git-shell-commands/list
new file mode 100755
index 0000000..ffc5ac4
--- /dev/null
+++ b/contrib/git-shell-commands/list
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+print_if_bare_repo='
+       if "$(git --git-dir="$1" rev-parse --is-bare-repository)" = true
+       then
+               printf "%s\n" "${1#./}"
+       fi
+'
+
+find -type d -name "*.git" -exec sh -c "$print_if_bare_repo" -- \{} \; -prune 2>/dev/null
-- 
1.7.0.4