Add optional release name arg to install command

README.md

@@ -159,7 +159,7 @@ Refer to the [repo-specific commands](#repo-specific) section for details on usi
 ## Commands
 ### Repo-agnostic
 * **`config <key> [<val>]`**: Get or set a value of key from configuration file `~/.gec`. To list all values, specify `-l`.
-* **`install`**: Update to the latest release of `gec`.
+* **`install [<release>]`**: Update to the named or latest release of `gec`.
 * **`list`**: Alias of `ls`.
 * **`ls [pattern]`**: List the output of the `state` command for matching repos in `~/gec/encrypted`. If specifying a pattern, it may need to be quoted.
 * **`lock`**: Unmount all mounted repos.

gec.sh

@@ -76,7 +76,11 @@ case "${CMD}" in
     exit
     ;;
   install)
-    release=$(curl -sS -f -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/impredicative/gec/releases | jq -r .[0].tag_name)
+    if [ "$#" -ge 2 ]; then
+      release="$2"
+    else
+      release=$(curl -sS -f -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/impredicative/gec/releases | jq -r .[0].tag_name)
+    fi
     prog_file="$0"
     sudo wget -q https://raw.githubusercontent.com/impredicative/gec/${release}/gec.sh -O "${prog_file}"
     sudo chmod +x "${prog_file}"