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aa2cc18745
The `archive` package defines aliases for `io.ReadCloser` and `io.Reader`. These don't seem to provide an benefit other than type decoration. Per this change, several unnecessary type cases were removed. Signed-off-by: Stephen J Day <stephen.day@docker.com>
59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
package archive
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import (
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"archive/tar"
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"bytes"
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"io"
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)
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// Generate generates a new archive from the content provided
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// as input.
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//
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// `files` is a sequence of path/content pairs. A new file is
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// added to the archive for each pair.
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// If the last pair is incomplete, the file is created with an
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// empty content. For example:
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//
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// Generate("foo.txt", "hello world", "emptyfile")
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//
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// The above call will return an archive with 2 files:
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// * ./foo.txt with content "hello world"
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// * ./empty with empty content
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//
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// FIXME: stream content instead of buffering
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// FIXME: specify permissions and other archive metadata
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func Generate(input ...string) (io.Reader, error) {
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files := parseStringPairs(input...)
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buf := new(bytes.Buffer)
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tw := tar.NewWriter(buf)
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for _, file := range files {
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name, content := file[0], file[1]
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hdr := &tar.Header{
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Name: name,
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Size: int64(len(content)),
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}
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if err := tw.WriteHeader(hdr); err != nil {
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return nil, err
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}
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if _, err := tw.Write([]byte(content)); err != nil {
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return nil, err
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}
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}
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if err := tw.Close(); err != nil {
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return nil, err
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}
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return buf, nil
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}
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func parseStringPairs(input ...string) (output [][2]string) {
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output = make([][2]string, 0, len(input)/2+1)
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for i := 0; i < len(input); i += 2 {
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var pair [2]string
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pair[0] = input[i]
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if i+1 < len(input) {
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pair[1] = input[i+1]
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}
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output = append(output, pair)
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}
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return
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}
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