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moby--moby/pkg/ansiescape/split.go
Derek McGowan ed13c3abfb Use notary library for trusted image fetch and signing
Add a trusted flag to force the cli to resolve a tag into a digest via the notary trust library and pull by digest.
On push the flag the trust flag will indicate the digest and size of a manifest should be signed and push to a notary server.
If a tag is given, the cli will resolve the tag into a digest and pull by digest.
After pulling, if a tag is given the cli makes a request to tag the image.

Use certificate directory for notary requests

Read certificates using same logic used by daemon for registry requests.

Catch JSON syntax errors from Notary client

When an uncaught error occurs in Notary it may show up in Docker as a JSON syntax error, causing a confusing error message to the user.
Provide a generic error when a JSON syntax error occurs.

Catch expiration errors and wrap in additional context.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
2015-07-24 14:08:20 -07:00

89 lines
2 KiB
Go

package ansiescape
import "bytes"
// dropCR drops a leading or terminal \r from the data.
func dropCR(data []byte) []byte {
if len(data) > 0 && data[len(data)-1] == '\r' {
data = data[0 : len(data)-1]
}
if len(data) > 0 && data[0] == '\r' {
data = data[1:]
}
return data
}
// escapeSequenceLength calculates the length of an ANSI escape sequence
// If there is not enough characters to match a sequence, -1 is returned,
// if there is no valid sequence 0 is returned, otherwise the number
// of bytes in the sequence is returned. Only returns length for
// line moving sequences.
func escapeSequenceLength(data []byte) int {
next := 0
if len(data) <= next {
return -1
}
if data[next] != '[' {
return 0
}
for {
next = next + 1
if len(data) <= next {
return -1
}
if (data[next] > '9' || data[next] < '0') && data[next] != ';' {
break
}
}
if len(data) <= next {
return -1
}
// Only match line moving codes
switch data[next] {
case 'A', 'B', 'E', 'F', 'H', 'h':
return next + 1
}
return 0
}
// ScanANSILines is a scanner function which splits the
// input based on ANSI escape codes and new lines.
func ScanANSILines(data []byte, atEOF bool) (advance int, token []byte, err error) {
if atEOF && len(data) == 0 {
return 0, nil, nil
}
// Look for line moving escape sequence
if i := bytes.IndexByte(data, '\x1b'); i >= 0 {
last := 0
for i >= 0 {
last = last + i
// get length of ANSI escape sequence
sl := escapeSequenceLength(data[last+1:])
if sl == -1 {
return 0, nil, nil
}
if sl == 0 {
// If no relevant sequence was found, skip
last = last + 1
i = bytes.IndexByte(data[last:], '\x1b')
continue
}
return last + 1 + sl, dropCR(data[0:(last)]), nil
}
}
if i := bytes.IndexByte(data, '\n'); i >= 0 {
// No escape sequence, check for new line
return i + 1, dropCR(data[0:i]), nil
}
// If we're at EOF, we have a final, non-terminated line. Return it.
if atEOF {
return len(data), dropCR(data), nil
}
// Request more data.
return 0, nil, nil
}