url-lib adds some functions for dealing with URLs (mostly for fetching
files, for the moment).
It uses curl to handle http/https/ftp URLs, but it can be extended by other
modules at runtime by using the "add_url_handler" function.
Signed-off-by: Will Woods <wwoods@xxxxxxxxxx>
---
modules.d/45url-lib/module-setup.sh | 24 +++++++++++++
modules.d/45url-lib/url-lib.sh | 66 +++++++++++++++++++++++++++++++++++
2 files changed, 90 insertions(+), 0 deletions(-)
create mode 100755 modules.d/45url-lib/module-setup.sh
create mode 100755 modules.d/45url-lib/url-lib.sh
diff --git a/modules.d/45url-lib/module-setup.sh b/modules.d/45url-lib/module-setup.sh
new file mode 100755
index 0000000..eab9f25
--- /dev/null
+++ b/modules.d/45url-lib/module-setup.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+# module-setup for url-lib
+
+check() {
+ command -v curl >/dev/null || return 1
+ return 255
+}
+
+depends() {
+ echo network
+ return 0
+}
+
+install() {
+ inst "$moddir/url-lib.sh" "/lib/url-lib.sh"
+ dracut_install curl
+ mkdir -m 0755 -p "$initdir/etc/ssl/certs"
+ if ! inst_any -t /etc/ssl/certs/ca-bundle.crt \
+ /etc/ssl/certs/ca-bundle.crt \
+ /etc/ssl/certs/ca-certificates.crt; then
+ dwarn "Couldn't find SSL CA cert bundle; HTTPS won't work."
+ fi
+}
+
diff --git a/modules.d/45url-lib/url-lib.sh b/modules.d/45url-lib/url-lib.sh
new file mode 100755
index 0000000..51340d5
--- /dev/null
+++ b/modules.d/45url-lib/url-lib.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+# url-lib.sh - functions for handling URLs (file fetching etc.)
+#
+# Authors:
+# Will Woods <wwoods@xxxxxxxxxx>
+
+type mkuniqdir >/dev/null 2>&1 || . /lib/dracut-lib.sh
+
+# fetch_url URL [OUTFILE]
+# fetch the given URL to a locally-visible location.
+# if OUTFILE is given, the URL will be fetched to that filename,
+# overwriting it if present.
+# the return values are as follows:
+# 0: success
+# 253: unknown error (file missing)
+# 254: unhandled URL scheme / protocol
+# 255: bad arguments / unparseable URLs
+# other: fetch command failure (whatever curl/mount/etc return)
+fetch_url() {
+ local url="$1" outloc="$2"
+ local handler="$(get_url_handler $url)"
+ [ -n "$handler" ] || return 254
+ [ -n "$url" ] || return 255
+ $handler "$url" "$outloc"
+}
+
+# get_url_handler URL
+# returns the first HANDLERNAME corresponding to the URL's scheme
+get_url_handler() {
+ local scheme="${1%%:*}" item=""
+ for item in $url_handler_map; do
+ [ "$scheme" = "${item%%:*}" ] && echo "${item#*:}" && return 0
+ done
+ return 1
+}
+
+# add_url_handler HANDLERNAME SCHEME [SCHEME...]
+# associate the named handler with the named scheme(s).
+add_url_handler() {
+ local handler="$1"; shift
+ local schemes="$@" scheme=""
+ set --
+ for scheme in $schemes; do
+ set -- "$@" "$scheme:$handler"
+ done
+ set -- $@ $url_handler_map # add new items to *front* of list
+ url_handler_map="$@"
+}
+
+curl_args="--location --retry 3 --fail --show-error"
+curl_fetch_url() {
+ local url="$1" outloc="$2"
+ if [ -n "$outloc" ]; then
+ curl $curl_args --output "$outloc" "$url" || return $?
+ else
+ local outdir="$(mkuniqdir /tmp curl_fetch_url)"
+ local cwd="$(pwd)"
+ cd "$outdir"
+ curl $curl_args --remote-name "$url" || return $?
+ cd "$cwd"
+ outloc="$(echo $outdir/*)"
+ fi
+ [ -f "$outloc" ] || return 253
+ echo "$outloc"
+}
+add_url_handler curl_fetch_url http https ftp
--
1.7.7.6
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