1 files changed, 144 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/build-support/fetchurl/builder.sh b/nixpkgs/pkgs/build-support/fetchurl/builder.sh
new file mode 100644
index 000000000000..f9bc8b602f4c
--- /dev/null
+++ b/nixpkgs/pkgs/build-support/fetchurl/builder.sh
@@ -0,0 +1,144 @@
+source $stdenv/setup
+
+source $mirrorsFile
+
+curlVersion=$(curl -V | head -1 | cut -d' ' -f2)
+
+# Curl flags to handle redirects, not use EPSV, handle cookies for
+# servers to need them during redirects, and work on SSL without a
+# certificate (this isn't a security problem because we check the
+# cryptographic hash of the output anyway).
+curl=(
+    curl
+    --location
+    --max-redirs 20
+    --retry 3
+    --disable-epsv
+    --cookie-jar cookies
+    --insecure
+    --user-agent "curl/$curlVersion Nixpkgs/$nixpkgsVersion"
+    $curlOpts
+    $NIX_CURL_FLAGS
+)
+
+downloadedFile="$out"
+if [ -n "$downloadToTemp" ]; then downloadedFile="$TMPDIR/file"; fi
+
+
+tryDownload() {
+    local url="$1"
+    echo
+    header "trying $url"
+    local curlexit=18;
+
+    success=
+
+    # if we get error code 18, resume partial download
+    while [ $curlexit -eq 18 ]; do
+       # keep this inside an if statement, since on failure it doesn't abort the script
+       if "${curl[@]}" -C - --fail "$url" --output "$downloadedFile"; then
+          success=1
+          break
+       else
+          curlexit=$?;
+       fi
+    done
+}
+
+
+finish() {
+    set +o noglob
+
+    if [[ $executable == "1" ]]; then
+      chmod +x $downloadedFile
+    fi
+
+    runHook postFetch
+    exit 0
+}
+
+
+tryHashedMirrors() {
+    if test -n "$NIX_HASHED_MIRRORS"; then
+        hashedMirrors="$NIX_HASHED_MIRRORS"
+    fi
+
+    for mirror in $hashedMirrors; do
+        url="$mirror/$outputHashAlgo/$outputHash"
+        if "${curl[@]}" --retry 0 --connect-timeout "${NIX_CONNECT_TIMEOUT:-15}" \
+            --fail --silent --show-error --head "$url" \
+            --write-out "%{http_code}" --output /dev/null > code 2> log; then
+            tryDownload "$url"
+            if test -n "$success"; then finish; fi
+        else
+            # Be quiet about 404 errors, which we interpret as the file
+            # not being present on this particular mirror.
+            if test "$(cat code)" != 404; then
+                echo "error checking the existence of $url:"
+                cat log
+            fi
+        fi
+    done
+}
+
+
+# URL list may contain ?. No glob expansion for that, please
+set -o noglob
+
+urls2=
+for url in $urls; do
+    if test "${url:0:9}" != "mirror://"; then
+        urls2="$urls2 $url"
+    else
+        url2="${url:9}"; echo "${url2/\// }" > split; read site fileName < split
+        #varName="mirror_$site"
+        varName="$site" # !!! danger of name clash, fix this
+        if test -z "${!varName}"; then
+            echo "warning: unknown mirror:// site \`$site'"
+        else
+            mirrors=${!varName}
+
+            # Allow command-line override by setting NIX_MIRRORS_$site.
+            varName="NIX_MIRRORS_$site"
+            if test -n "${!varName}"; then mirrors="${!varName}"; fi
+
+            for url3 in $mirrors; do
+                urls2="$urls2 $url3$fileName";
+            done
+        fi
+    fi
+done
+urls="$urls2"
+
+# Restore globbing settings
+set +o noglob
+
+if test -n "$showURLs"; then
+    echo "$urls" > $out
+    exit 0
+fi
+
+
+if test -n "$preferHashedMirrors"; then
+    tryHashedMirrors
+fi
+
+# URL list may contain ?. No glob expansion for that, please
+set -o noglob
+
+success=
+for url in $urls; do
+    tryDownload "$url"
+    if test -n "$success"; then finish; fi
+done
+
+# Restore globbing settings
+set +o noglob
+
+if test -z "$preferHashedMirrors"; then
+    tryHashedMirrors
+fi
+
+
+echo "error: cannot download $name from any mirror"
+exit 1