From 57931ad8622ea4dd17b36a857acdd74139a09f62 Mon Sep 17 00:00:00 2001
From: Ian Kelling <iank@fsf.org>
Date: Thu, 14 Oct 2021 07:42:34 -0400
Subject: [PATCH] document and handle dependencies

---
 README.md | 13 +++++++++----
 kaya      | 14 ++++++++++++++
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 1d918c5..b92f0df 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,10 @@ GPLv3-or-later
 
 ## Installation
 
+Install dependencies:
+
+    apt install pwgen flock apache2-utils
+
 Copy the binaries into place:
 
     cp  kaya            /usr/local/bin/
@@ -29,10 +33,11 @@ Copy the binaries into place:
     mkdir -p    /srv/backups/kaya/
     touch       /srv/backups/kaya/.htpasswd
 
-**Also** install [rest-server](https://github.com/restic/rest-server) on the
-backup host, and [restic](https://github.com/restic/restic) on your backup
-targets.  Both can be complied into a statically-linked binary, so it's just a
-matter of copying the appropriate binaries into the `PATH` of each machine.
+**Also** install [rest-server](https://github.com/restic/rest-server) on
+the backup host, and [restic](https://github.com/restic/restic) on your
+backup targets and backup host.  Both can be complied into a
+statically-linked binary, so it's just a matter of copying the
+appropriate binaries into the `PATH` of each machine.
 
 ## Usage
 
diff --git a/kaya b/kaya
index 65fba96..a7a1bc3 100755
--- a/kaya
+++ b/kaya
@@ -126,6 +126,20 @@ EOF
 }
 
 function main() {
+    local program
+    local missing_prog
+    missing_prog=false
+    for program in flock pwgen; do
+        if ! type -p $program &>/dev/null; then
+            echo "kaya: error: install $program (package $program on debian based systems)"
+        fi
+    done
+    if ! type -p htpasswd; then
+        echo "kaya: error: install htpasswd (package apache2-utils on debian based systems)"
+    fi
+    if $missing_prog; then
+        exit 1
+    fi
     set_defaults
     get_params "$@"
 
-- 
2.25.1